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Decanter centrifuge | Sludge dehydrator | Centrifugal dehydrator | mud dehydrator | Jinhua horizontal screw centrifuge | Complete set of sludge dewatering equipment

Types of sludge classification

2021-05-28 11:22:03

In recent years, China has issued a series of policies and measures to promote the development of sludge disposal industry. Among them, proper disposal of sludge, effective utilization of resources in sludge, improvement of disposal efficiency and reduction of disposal cost have become the focus of the industry.

1. Sludge classification
Raw sludge: primary precipitated sludge without sludge treatment. Secondary sedimentation excess sludge or mixed sludge of both.
Primary sludge: the sediment discharged from the primary sedimentation tank.
Secondary sludge: sediment discharged from secondary sedimentation tank (or sedimentation area).
Activated sludge: flocs containing various aerobic microbial populations propagated in the aeration tank.
Digested sludge: the concentration of organic matter in the sludge after aerobic or anaerobic digestion decreases to a certain extent and tends to be stable.
Returned sludge: activated sludge separated from secondary sedimentation (or sedimentation area) and returned to aeration tank.
Excess activated sludge: the activated sludge discharged from the secondary sedimentation tank (or sedimentation area) outside the system in the activated sludge system.
Sludge gas: during anaerobic digestion of sludge, the gas produced by the decomposition of substances, mainly composed of methane and carbon dioxide, and a small amount of hydrogen, nitrogen and hydrogen sulfide. Commonly known as biogas.

Processing type
Sludge digestion: under the condition of oxygen or no oxygen, the organic matter in sludge is transformed into more stable substances by using the action of microorganisms.
Aerobic digestion: sludge is aerated for a long time, and part of organic matter is degraded and stabilized by aerobic microorganisms.
Anaerobic digestion: under anaerobic conditions, the organic matter in sludge is degraded and stabilized by anaerobic microorganisms.
Mesophilic digestion: anaerobic digestion of sludge at 33-53 ℃.
Thermal digestion: anaerobic digestion of sludge at 53-330 ℃.
Sludge thickening: the process of reducing the water content of sludge and thickening the sludge by gravity or air flotation.
Elutriation of sludge: a sludge pretreatment method to improve the dewatering performance of sludge. Wash the sludge with clean water or waste water to reduce the alkalinity of digested sludge, save the dosage of sludge treatment, and improve the efficiency of sludge filtration and dehydration.
Sludge dewatering: the process of further removing part of the water content of concentrated sludge, generally refers to mechanical dewatering.
Sludge vacuum filtration: a sludge dewatering method that uses vacuum to depressurize one side of the filter medium, resulting in a differential pressure on both sides of the medium, and forcibly filters the sludge water through the medium.
Sludge pressure filtration: a sludge dewatering method that uses positive pressure filtration to force the sludge water to filter through the medium.

Sludge drying: the process of removing most of the water content from sludge through infiltration or evaporation. Generally, it refers to the use of self evaporation facilities such as sludge drying field (bed) or drying facilities using heat sources such as steam, flue gas and hot oil.

Sludge incineration: a process of sludge disposal. It uses an incinerator to heat and dry the dewatered sludge, and then oxidizes the organic matter in the sludge at high temperature to make the sludge become a small amount of ash.

Before sludge treatment, it is necessary to understand the classification of sludge before determining the method of sludge treatment:
1. Treatment of physicochemical sludge discharged from sedimentation tank or thickening tank of Waterworks
Sludge classification: it belongs to medium and fine-grained organic and inorganic mixed sludge, with general compressibility and dewatering performance.
2. Treatment of residual activated sludge discharged from secondary sedimentation tank of domestic sewage plant
Sludge classification: it belongs to hydrophilic and fine-grained organic sludge with poor compressibility and dehydration performance.
3. Treatment of physicochemical and biochemical mixed sludge discharged from concentration tank from industrial wastewater treatment
Sludge classification: it belongs to medium and fine-grained mixed sludge. The dewatering performance of fibrous body is good, and the other compressibility and dewatering performance are general.
4. Treatment of physicochemical fine-grained sludge produced by physical and chemical methods discharged from the concentration tank from industrial wastewater treatment
Sludge classification: it belongs to fine-grained inorganic sludge with general compressibility and dewatering performance.
5. Physicochemical sedimentation and coarse-grained sludge treatment from industrial wastewater treatment

Sludge classification: it belongs to coarse-grained hydrophobic inorganic sludge with good compressibility and dewatering performance

1 sludge disposal technology

1. General technology of sludge treatment and utilization

(1) sludge composting treatment technology

(2) building material technology of sludge

(3) fuel technology of sludge

(4) anaerobic digestion (biogas production) technology of sludge

2. Solar sludge drying technology

3. Ionizing radiation treatment technology of sludge

4. Application of microwave technology in sludge treatment

(1) microwave irradiation sludge treatment technology

⑵ microwave chemical analysis technology

5. Ultrasonic sludge treatment technology

⒍ bioavailability of heavy metals and plant removal technology

7 microbial treatment technology of sludge

(1) microbial leaching technology
(2) microbial adsorption treatment

(3) microbial deodorization technology

8. Emerging thermochemical sludge treatment technology

(1) wet oxidation technology

(2) activated sludge as binder

(3) preparation of degradable plastics from surplus sludge

(4) preparation of activated carbon from sludge

(5) O3 / H2O2 oxidation technology

(6) UV / O3 oxidation technology

(7) UV / H2O2 oxidation process

(8) introduction to other thermochemical treatment technologies

1 method analysis
security landfill

This treatment method is simple, easy, low cost, sludge does not need high dehydration, and has strong adaptability. However, there are also some problems in sludge landfill, especially the formation of landfill leachate and gas. Leachate is a kind of seriously polluted liquid. If the landfill site is selected or operated improperly, it will pollute the groundwater environment. The gas produced by landfill site is mainly methane, which will cause explosion and combustion if appropriate measures are not taken.

land use 

Due to the advantages of low investment, low energy consumption, low operation cost and the organic part can be transformed into soil conditioner, the direct land use of sludge is considered to be a disposal method with development potential. Scientific and reasonable land use can reduce the negative effects brought by sludge. The use of forest land and municipal greening has become an effective way of sludge land use because it is not easy to pollute the food chain. Sludge is used for the restoration and reconstruction of seriously disturbed land (such as mine land, forest logging field, landfill, seriously damaged surface area and other land requiring reclamation), which reduces the potential threat of sludge to human life, and not only disposes of sludge, but also restores the ecological environment.


Direct incineration of wet sludge after drying is widely used. Direct incineration of sludge without drying is not only very difficult, but also very uneconomic in energy consumption.

The sludge treatment method with incineration as the core is one of the thorough sludge treatment methods. It can carbonize all organic matter, kill pathogens and greatly reduce the volume of sludge; However, its disadvantages are large investment in treatment facilities, high treatment costs, high equipment maintenance costs, and the production of strong carcinogen dioxin.

Sludge drying
Sludge drying is a treatment method of deep dehydration of sludge by using artificial heat source and industrial equipment. Although the direct result of sludge drying is the decrease of sludge moisture content (dehydration), its application purpose and effect are very different from mechanical dehydration.

Mechanical dewatering of sludge (also including sludge thickening) is mainly used to reduce the volume of sludge treatment (sludge thickening and mechanical dewatering can usually reduce the volume of sludge by about 4 times). However, in addition to the water content and related physical properties, such as fluidity, which are different from the original sludge, the chemical and biological properties of dewatered sludge cake do not change due to dewatering.

For sludge drying, due to the requirements of improving water evaporation intensity, artificial heat source is used, and its operating temperature (for sludge particles) is usually greater than 100 ℃. The treatment effect of drying on sludge is not only deep dehydration, but also heat treatment; In addition, the moisture content of the product of sludge drying treatment can be controlled below 20%, that is, it can inhibit the microbial activity in sludge. Therefore, sludge drying treatment can change the physical, chemical and biological characteristics of sludge at the same time.

new technique

With the strengthening of environmental protection and people's further understanding of the limitations of existing sludge treatment and disposal technologies, countries all over the world are investing heavily in the research and development of new technologies to find a more economical and reasonable sludge treatment scheme.

Free processing
The technological innovation adopts the sludge washing process, which first washes out the organic matter in the sludge, separates the inorganic matter from the sewage soil, and then condenses the organic sludge for high-temperature anaerobic digestion treatment. After washing, the precipitated sludge washes out half of the solid inorganic sewage in the sludge, reducing half of the biological treatment capacity and saving the project investment and treatment cost; Separate treatment of organic sludge removes the precipitation of inorganic sludge soil in the reactor, reducing equipment wear and maintenance of the reactor; After washing, the precipitated sludge washes out most of the heavy metals and inorganic sewage that are easy to precipitate in the sludge, which improves the quality of organic fertilizer; The washed sludge soil can also produce road color bricks and permeable bricks. Other innovative processes: ultra high temperature anaerobic digestion, multi-stage anaerobic digestion, biogas residue floating, etc. the biological treatment speed of sludge has been increased several times and the biogas output has been increased by more than 20%.

For the biological treatment system of precipitated sludge, the engineering design innovation adopts the design of buried, compact and multi-stage digestion reactor. Several independent anaerobic digestion reactors are integrated with each other, saving building materials and adopting concrete structure, with low cost. The existing anaerobic digestion reactors at home and abroad generally adopt the above ground structure, which can make the equipment easy to maintain and facilitate the discharge of biogas residue to prevent biogas residue sedimentation. The engineering design of the biological treatment system well solves the maintenance of supporting equipment and biogas residue sedimentation. The system is equipped with less equipment. Only a few water pumps are needed, that is, if the water pump is broken, it will take less than 20 minutes to replace one, so as to ensure that the equipment maintenance will not stop production; The precipitated sludge is washed to remove the inorganic sewage soil that is easy to precipitate, and the organic sludge will float without sedimentation under the action of the blowing and floating system. The buried anaerobic digestion reactor not only has less investment and does not occupy land, but also can prevent earthquake, lightning and long service life, and reduce the heat loss of the digestion system.

Sludge fermentation organic fertilizer

There are three traditional sludge treatment methods: incineration, landfill and resource utilization. Incineration technology is mostly used abroad, but the investment is huge, which is easy to cause air pollution; Landfill is mostly used in China, but it needs to occupy a lot of land, which will cause secondary pollution to the environment at the same time; There are few land renewable resources in large and medium-sized cities such as Shanghai in China, so it is difficult to adopt this method for a long time. Chen Liqiao said that there are broad prospects for treating sludge with microorganisms. Through the field test and practical application of sewage treatment plant, the economic benefit of about 150 yuan can be obtained for each ton of sludge treated. Shanghai discharges about 1.4 million tons of sludge every year. If 20% of the sludge is treated by microbial aerobic fermentation, the direct economic benefit is about 42 million yuan. In addition, the use of microbial aerobic fermentation can also eliminate the odor of sludge, effectively control the secondary pollution of sludge, and the environmental benefits are also significant.

Ferment the sludge into organic fertilizer. If some cow dung is added, it will ferment into high-quality organic fertilizer. The specific operation methods are as follows:
1. Add bacteria. 1kg Gymboree fertilizer starter can ferment about 4 tons of sludge + cow dung. It is necessary to add about 30-50% cow dung, or straw powder, mushroom residue, peanut shell powder, or rice husk, sawdust and other organic materials according to the weight ratio in order to adjust the ventilation. If rice husk and sawdust are added, the fermentation time should be prolonged because of their high cellulose and lignin. Strain dilution: add 5-10kg rice bran (or bran, corn flour and other substitutes) to each kilogram of starter, mix well, dilute it, and then evenly sprinkle it into the material pile. The use effect will be better.
2. Build a pile. After material preparation, build a pile while spreading bacteria. The pile height and volume should not be too low and small. Requirements: the pile height is 1.5-2m, the width is 2m, and the length is 2-4m
3. Mix well. Gymboree fertilizer starter requires aerobic fermentation, so oxygen supply measures should be increased to mix well, turn frequently and ventilate. Otherwise, it will lead to anaerobic fermentation and produce odor, which will affect the effect.
4. Moisture. The moisture of fermentation materials should be controlled at 60 ~ 65%. Moisture judgment: hold a handful of materials tightly, see the watermark on the finger seam but do not drip, and it is appropriate to scatter on the ground. Less water, slow fermentation, more water and poor ventilation will also lead to the work of "spoilage bacteria" and produce odor.
5. Temperature. The start-up temperature should be above 15 ℃ (it can be operated in four seasons and is not affected by seasons. It is better to ferment indoors or in the greenhouse in winter), and the fermentation temperature should be controlled below 70-75 ℃.

6. Done. It should be overturned when the temperature reaches above 65 ℃ in the second to third days. Generally, the fermentation can be completed within one week. The material is dark brown, and the temperature begins to drop to normal temperature, indicating that the fermentation is completed. If there are too many sawdust, sawdust and rice husk auxiliary materials, the fermentation time shall be extended until it is fully decomposed.

Fermented organic fertilizer has good fertilizer effect, safe and convenient use, disease resistance and growth promotion, and can also improve soil fertility.

Lime dosing technology

The dewatered sludge enters the hopper. Lime and aminoxanthic acid are added into the hopper. The lime dosage is 10% - 15% of the wet sludge dosage, and the aminoxanthic acid dosage is about 1% of the lime dosage. Because aminoxanthic acid produces ammonia in the reaction process, the sterilization effect of the whole process is enhanced and the reaction temperature is reduced. After the sludge, quicklime and aminoxanthic acid are stirred in the hopper, they are pushed into the feed port of the plunger pump by the double screw feeder, and sent to the reactor through the plunger pump. They stay at 70 ℃ for 30 minutes. The output products can meet the American EPA part503 class a standard. The sludge after reaction is pumped to the silo, and the gas generated in the sealed container is discharged after being treated by the washing tower.

Characteristics of the process

PH > 12, long duration, complete sterilization; High pH precipitates most metal ions and reduces their solubility and activity; The solid content of sludge can be increased to 30%; The odor in the sludge is removed, and the system is fully sealed without environmental pollution; The system is fully automatic and easy to operate and maintain: a small amount of aminoxanthic acid is added to reduce the amount of lime and reaction time, and reduce the operation cost.

Sludge carbonization technology

The so-called sludge carbonization refers to the process of releasing the water in the sludge through certain means, while retaining the carbon value in the sludge to a great extent, so as to greatly improve the carbon content in the end product (sludge carbonization o in the world, sludge carbonization is mainly divided into three types.

1. High temperature carbonization. During carbonization, there is no pressure, and the temperature is 649-982 ℃. First dry the sludge to a moisture content of about 30%, and then enter the carbonization furnace for high-temperature carbonization and granulation. Carbonized particles can be used as low-grade fuel with a calorific value of about 8360-12540 kJ / kg (Japan or the United States). This technology can realize the reduction and recycling of sludge. However, due to its complex technology, high operation cost and low calorific value content in products, it has not been applied on a large scale, with 30 wet sludge on a large scale.

2. Medium temperature carbonization. During carbonization, no pressure is applied, and the temperature is 426 ~ 537 ℃. First dry the sludge to about 90% moisture content, and then enter the carbonization furnace for decomposition. Oil, reaction water (steam condensate), biogas (uncondensed air) and solid carbides are produced in the process. In addition to carbonization, there is no obvious economic benefit for other users in Australia.

3. Low temperature carbonization. There is no need to dry before carbonization. During carbonization, it is pressurized to 6 ~ 8 MPa and the carbonization temperature is 315 ℃. The carbonized sludge becomes liquid. The moisture content after dehydration is less than 50%. After drying and granulation, it can be used as low-grade fuel with a calorific value of about 15048 ~ 20482 kJ / kg (United States). This technology makes all the biomass in the sludge split by heating and pressurization, and 75% of the water in the sludge can be removed only by mechanical method, which greatly saves the energy consumption in operation. The complete cracking of sludge ensures the complete stability of sludge. During the process of sludge carbonization, most of the calorific value in sludge is retained, which creates conditions for the reuse of energy after pyrolysis 14T.

4. Sludge hydrolysis heat drying technology. By heating the sludge and hydrolyzing the viscous organic matter in the sludge at a certain temperature and pressure, the sludge hydrothermal drying technology can destroy the colloidal structure of the sludge and improve the dehydration performance and anaerobic digestion performance at the same time. With the increase of hydrothermal reaction temperature and pressure, the particle collision increases. The collision between particles leads to the destruction of colloidal structure and the separation of bound water and solid particles. After hydrothermal treatment, the moisture content of sludge mechanically dehydrated without adding flocculant is greatly reduced. Macroscopically, the hydrolysis of sludge shows that the concentration of volatile suspended solids decreases and the concentrations of COD, BOD and ammonia nitrogen increase. The hydrothermal drying technology adopts a slurry reactor, which preheats the slurry by flashing and waste steam back mixing, and the steam and machinery are mixed together to improve the treatment efficiency of the system; In the hydrothermal reactor, the way of direct mixed heating with steam reverse flow is adopted to strengthen the mass and heat transfer process, which can avoid local overheating, coking and carbonization. In the continuous flash reactor, the effective recovery of system energy is realized.

1 processing steps

First, the raw sludge is pumped from the secondary sedimentation tank to another tank through the sludge pump, so as to be separated from the supernatant. Because the moisture content of raw sludge can usually reach 99.5%, the sludge must be concentrated. There are many feasible methods to reduce the volume of sludge. Mechanical treatment methods such as vacuum filtration and centrifugation are usually used before sludge is disposed of in semi-solid form. Generally, these methods are the preparation of sludge incineration treatment. If biological treatment is planned, most of them are concentrated by gravity sedimentation or air flotation. The sludge corresponding to these two cases is still in flow state.

The design and operation of gravity concentration tank is similar to that of secondary sedimentation tank in sewage treatment. The concentration function is the main design parameter. In order to meet the greater concentration capacity, the concentration tank is basically deeper than the secondary sedimentation tank. A gravity thickener with correct design and good operation can at least double the sludge content. In other words, the moisture content of sludge can be reduced from 99.5% to 98%, or less. It is worth mentioning here that the design of gravity thickener should be based on the analysis of Chinese results as much as possible, because the appropriate sludge load rate is closely related to the properties of sludge.

If dissolved air flotation is used for concentration, a small part of water is required, usually the effluent from the secondary sedimentation tank, and inflated under the pressure of 400kPa. This supersaturated liquid flows into the bottom of the tank, and the sludge passes through under atmospheric pressure. The gas adheres to or is surrounded by the solid particles in the sludge in the form of small bubbles, so as to drive the solid particles to float to the surface. The upper part of the concentrated sludge is removed, and the liquid flows back from the bottom to the dissolved air tank for inflation.

After the volume is reduced, the sludge contains a large number of harmful components, which need to be transformed into inert components before disposal. The commonly used method is biodegradation stability. Because the purpose of this process is to convert substances into final sterile products, digestion is often used. Sludge digestion can not only further reduce the sludge volume, but also convert the solids into inert substances, and there are generally no bacteria. Sludge digestion can be achieved through anaerobic digestion or aerobic digestion.

Sludge contains a variety of organic matter, so it needs a variety of microorganisms to decompose. According to relevant data, microorganisms in anaerobic digestion are divided into two categories: acidogenic bacteria and methanogens. Therefore, we can also divide anaerobic digestion into two steps. In the first step, acidogenic bacteria composed of facultative anaerobic bacteria and anaerobic bacteria dissolve organic solids through hydrolysis. Then the dissolved matter is transformed into alcohol and low molecular weight molecules by fermentation. In the second step, methanogens composed of strict anaerobic bacteria convert acetic acid, alcohol, water and carbon dioxide into methane. Because the two flora can only survive in an anaerobic environment, the reactor for anaerobic digestion must be closed. Other factors should also be considered when designing the container, such as temperature, pH value and mixture mixing.
Sludge can also be stabilized by aerobic digestion. This digestion can only be used for biochemical sludge, but not for sludge in primary sedimentation tank. With the reduction of sludge volume in secondary sedimentation tank and sludge thickening tank, this process needs continuous aeration. Aerobic digestion is mostly used in deep aeration system. Furthermore, aerobic digestion is not sensitive to environmental conditions and is not limited to epidemic changes.

After the sludge is digested, the organic matter in the sludge can be removed and the sludge volume can be further reduced. Next, the sludge needs to be disposed of. A variety of methods can be used to effectively dispose of sludge. These include incineration, sanitary landfill and use as fertilizer and soil conditioner. Raw sludge can be used for incineration, which can effectively reduce the moisture content. Adding fuel can be used to cause and maintain combustion, and municipal waste may also be used to achieve this goal. Raw sludge and digested sludge can also be disposed of by sanitary landfill. The land application of sludge has been practiced for several years, but now it is limited to the treatment of digested sludge. The nutrient composition of sludge is conducive to plant growth, and its particle characteristics can be used for land improvement. These applications are limited to feed crops and non-human consumption, and the possibility of using them to support edible plants is being studied. The main limiting factors of sludge land application are plant enrichment, metal toxicity and water eutrophic pollution. The application of sludge can be through spraying by sprinkler, channel diversion or direct injection into soil. Dewatered sludge can be laid on the land and cultivated by traditional agricultural machinery.

The above words refer to the treatment of general sludge. Because sludge can cause environmental pollution, we need to make great efforts to make it harmless. Nowadays, many sludge with different characteristics that lead to different types of pollution are being studied. In this paper, I will describe a kind of sludge from human oil production and petroleum industry. This representative sludge is called oily sludge.

A large amount of sludge is produced, which contains a considerable amount of oil and must be removed before final disposal. The sludge produced by the refinery cannot be safely disposed of unless its oil content is removed to a certain extent. In addition, in the oil-water separation system and oil storage tank of the refinery, the treatment cost of sludge caused by the accumulation of oily raw materials is very high, and it causes serious pollution to the environment. Petroleum is a hydrophobic mixture, such as alkanes, aromatics, resins and asphalt. Many compounds are toxic, mutagenic and carcinogenic. Their emissions are strictly controlled because of their negative impact on human health and the environment. They are classified by the U.S. Environmental Protection Department and given priority to environmental pollutants.

There are many ways to treat oily sludge. Chemical and physical methods, such as incineration, chlorine oxidation, ozone oxidation and combustion, and biological treatment methods, such as bioremediation, traditional composting, etc. Nowadays, with the development of technology, low-temperature cold treatment and bioremediation of oily sludge have become two effective treatment ways.

As a physical treatment method, low temperature cold treatment technology can effectively increase the dewatering properties of sludge, change the structure of flocculant and reduce the water content around sludge. Compared with the "initial sedimentation", cold treatment can remove impurities in the solution, so it can achieve better concentration. This is the benefit of cold treatment. As far as we know, the feasibility of cold treatment technology to separate oil from oil sludge is not discussed in the current data. However, if natural conditions permit, cold treatment technology provides an effective method for the treatment and disposal of oily sludge in many countries.

By comparing the sludge after conventional treatment and cold treatment, we can find that there is a layer of oil floating on the sample after cold treatment. After, we can find that the test tube is divided into three layers: * * * the upper layer is clear oil slick, the bottom layer is dark sediment, and the middle layer is clear water. After 24-hour sedimentation of the original sludge, the floating liquid and bottom sediment can be seen, but there is no visible oil phase. The phenomenon described above reveals that simple cold treatment can effectively separate the oil in the oil sludge.

Physicochemical methods can be used to treat oil sludge, but the cost is very high. Composting and bioremediation by inoculating oil degrading bacteria or activating original organisms are regarded as two economic methods to deal with oil pollution. Composting has some visible advantages, such as low capital construction and maintenance costs, simple design and operation, and can remove part of the oil. However, composting treatment basically can not meet the current environmental standards.
Most of the oil contained in the sludge is difficult to biodegrade. Many studies have proved that bioremediation can effectively treat oily soil, but it is only for pollutants with high oil content. Most experiments are carried out in the laboratory, but few are applied in the industry. Bioremediation has just begun, which means advanced treatment technology.

1 treatment equipment

Sludge solidification mixing station
The advanced industrial computer control system is adopted to realize the automatic proportioning of loess, sludge, cement and lime. It has the characteristics of accurate measurement, good reliability, uniform mixing, convenient operation, good environmental protection, high production efficiency and low failure rate. It is especially suitable for continuous operation. It is an ideal equipment for sludge treatment in sewage treatment plant.
Mud separation dehydrator
Compared with the plate and frame filter press, the machine has the advantages of large processing capacity, good separation performance, strong adaptability, low labor intensity, stable performance, convenient installation and operation, small floor area and low maintenance cost, and can realize closed continuous automatic separation.
Horizontal screw centrifuge
Horizontal screw discharge sedimentation centrifuge (referred to as horizontal screw centrifuge) is an equipment that uses the principle of centrifugal sedimentation to separate suspension. For various suspensions with solid particle equivalent diameter = 3um, weight concentration ratio: 10% or volume concentration ratio = 70% and liquid-solid specific gravity difference: 0.05g/cm3, this kind of centrifuge is suitable for liquid-solid separation or particle classification.

Belt sludge dehydrator

Belt sludge dehydrator is an advanced technology imported from the United States. After digestion and absorption, it has been successfully developed as a high-efficiency dehydration equipment. It can continuously press filter. The product is made of high-strength materials and has the remarkable characteristics of large treatment capacity, high dehydration efficiency and long service life. Products are widely used in environmental treatment, vegetable processing and other industries that need to be pressed and dehydrated.
Solar heat pump technology and sludge treatment equipment

The system mainly uses clean energy such as solar energy and geothermal energy as the heat source of sludge drying, which can dry the mud with water content of more than 80 into dry materials with water content of less than 35, saving electricity, coal and environmental protection; The whole system is automatic remote control, which effectively reduces the cost of sludge treatment and disposal, and provides a low-carbon and environmental protection solution for sludge treatment and disposal.

The system includes greenhouse part, transmission part, ventilation part, heat collection part (including solar heat collection system and heat pump system), automatic control part and other auxiliary devices such as harmful gas collection and deodorization.
Using solar energy as the main energy to meet the needs of sustainable development; Low energy consumption and low operation and management cost. The power consumption of evaporating 1t water is only 60-80kw · h, while the power consumption of traditional thermal drying technology is 800-1060kw · H; After drying treatment, the sludge volume can be reduced to 1 / 3-1 / 5 of the original, so as to realize stabilization and retain its original reuse value; The system operates stably and safely with small dust generation; High degree of automation, convenient operation and maintenance and long service life; The system has high transparency and good environmental coordination.

The system consists of:

Sludge conveying system

It is composed of receiving bin, screw feeder, gate valve, sludge pump and pipeline. The hydraulic part of the whole system adopts Italian pumps and valves. The screw feeder and the silo are connected by a plug-in valve, which is convenient for maintenance. The pusher adopts the design of s swing tube. The mud cake with water content of about 85% is unloaded into the silo by truck and fed into the hydraulic pusher through the screw feeder. The pusher transports the sludge through the pipeline. There is no peculiar smell in the whole process, which can realize long-distance and high lift transportation without polluting the environment. The pipeline can be flexibly set according to the building structure, with accurate transportation volume. It is equipped with communication interface to realize remote control. Traditional conveying methods such as belt and bucket lift can also be selected.

Greenhouse heating system

It is composed of solar collector, heat collecting water tank, constant temperature water tank and PLC control. The heat collecting water tank is connected with the tap water make-up pipe. The tap water make-up pipe is equipped with a water source solenoid valve, and the water level sensor is set in the heat collecting water tank; The PLC controls the opening and closing of the water source solenoid valve according to the water level signal output by the water level sensor, so as to automatically replenish water to the heat collection tank, realize regular and quantitative water supply, and the water volume in the heat collection tank can be controlled according to the actual situation. The steam is released through the safety exhaust valve, and the heating area of the collector array is controlled through the heating control valve to ensure the stability and safety of the system operation.

Greenhouse system

It is composed of greenhouse main body, internal thermal insulation part, ventilation part, heating part, meteorological station, etc. The main body of the greenhouse is Wenluo type sunlight plate greenhouse with hollow glass on the sunny side. Select thermal insulation curtain to reduce the loss of radiant heat. The ventilation adopts fan, and the top adopts butterfly mode to open windows alternately, which can realize automatic switching according to indoor and outdoor temperature, humidity and illumination. The heating system is designed according to the technical code for floor radiant heating (jgj142-2004).

Sludge tipping and distributing system

It is composed of sludge paver, screw feeder, belt conveyor, dry material bin, harmful gas detector, industrial monitoring system, etc. The full-automatic mud dumper is a frequency conversion motor, which can automatically adjust the mud dumper speed, so that the sludge can be turned evenly, so as to realize surface renovation and evaporation of water. In the process, it also plays the role of supplying oxygen to the sludge to avoid the release of malodorous gas due to the reproduction of local anaerobic bacteria in the sludge. H2S and NH3 detectors are installed in the system, which can realize real-time monitoring.

Control system

The automatic control system adopts the basic control mode of configuration software + PLC. The upper computer realizes the monitoring and control of each equipment through communication with PLC and intelligent instrument. PLC can run independently through internal program. The upper computer adopts Taiwan Advantech industrial computer, and the production process route can be simulated and displayed on the computer interface. The process parameter point data can be displayed, adjusted and set on the computer interface, and enter the program. The process operation parameters can be randomly retrieved and printed, and the fault monitoring can realize the instantaneous recording and alarm function of fault point, fault type and occurrence time. An intelligent watt hour meter is configured to record the energy consumption data of the drying process in real time and convert the drying cost.

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