The horizontal screw centrifugal sludge dewatering unit is mainly composed of horizontal screw centrifuge, automatic flocculant preparation and dosing device, sludge crushing and cutting machine, sludge feed pump, dosing pump, single screw sludge transfer pump, flowmeter and automatic control system.
Sludge incineration equipment mainly includes rotary incinerator, vertical multi-stage incinerator, fluidized bed incinerator, etc. in the past, vertical multi-stage incinerator was commonly used abroad, and recently fluidized bed incinerator was commonly used.
In the process of urban sewage treatment, it is inevitable to produce sludge with high moisture content, which contains a lot of organic matter, rich nitrogen, phosphorus and heavy metals. With the improvement of sewage treatment rate and degree, the sludge output will inevitably increase, resulting in the increasingly serious problem of sludge disposal.
The greenhouse system consists of the main body of the greenhouse, ventilation system, heating circulation system, internal and external weather stations and computer control system.
Aerobic composting fermentation this process is mainly composed of dewatered sludge with moisture content of 75% and industrial waste fly ash, backfill and deodorant as adjusting agent, which are mixed in a certain proportion into the mixer.
The main disposal methods of sludge in China are sludge landfill and incineration. Its disposal methods can not realize the comprehensive utilization of sludge, and there are certain social and environmental problems, which is not the best way out of sludge disposal.
After sedimentation treatment, sewage will produce a large amount of sludge. Even after concentration and digestion treatment, the moisture content is still as high as 96%, which is very large and difficult to absorb and dispose. Dehydration treatment must be carried out to improve the solid content of mud cake, so as to reduce the floor area of sludge stacking.
PTA sealed explosion-proof centrifuge has a large specification, and the maximum specification of vertical spiral centrifuge currently used in China does not exceed φ 700mm, horizontal spiral centrifuge, the largest specification currently used in China is φ 1200mm。 The largest specification of the industrialized horizontal spiral centrifuge produced by domestic centrifuge manufacturers is φ About 750mm, and it is non hermetic explosion-proof type.
Sludge drying field is an older and simpler sludge dewatering method. Water removal mainly depends on infiltration, evaporation and skimming. However, as the nature of sludge is different from the local meteorological conditions, the proportion of water removed by infiltration, evaporation and skimming is also different.
Screw conveyor is the main component of horizontal screw centrifuge. Based on the static analysis of screw conveyor, further parameter analysis and optimization design is of great engineering practical significance for horizontal screw centrifuge.
The treatment capacity of the sludge dehydrator shall be controlled within an appropriate range and adjusted in combination with the flow of sludge, the flow of flocculant and the difference degree, so as to avoid the frequent fluctuation of the system and affect the treatment effect caused by the sudden increase of load, and realize relatively large equipment treatment efficiency at the same time;
A modifier is used to convert the organic matter such as protein and sugar in the sludge into oil and gas. The oil and gas becomes oil and gas in the carbonization process. The oil and gas is exported from the carbonization furnace and burned in the combustion chamber, which provides a main energy source for the carbonization furnace.
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.
Electroplating pickling sludge is mainly the sludge produced in the production process of electroplating and stainless steel processing industry. It itself contains a large amount of heavy metals nickel and chromium.
Chemical industry wastewater mainly comes from production wastewater discharged from petrochemical industry, coal chemical industry, acid-base industry, chemical fertilizer industry, plastic industry, pharmaceutical industry, dye industry, rubber industry, etc. The main measures for the prevention and control of chemical wastewater pollution are as follows: firstly, we should reform the production process and equipment, reduce pollutants, prevent the discharge of wastewater, and carry out comprehensive utilization and recovery;
According to the three existing states of oil in water - suspended state, emulsified state and dissolved state, and the characteristics of wastewater in different states, this paper expounds the main treatment methods of different kinds of oily wastewater, including physical method, chemical method and biological method, and summarizes the characteristics and application conditions of various methods.
The determination methods of 26 indexes encountered in the process of water treatment, as well as the common sense in the water treatment laboratory and the quality control of the laboratory, and some explanations of anaerobic terms are attached.
When the centrifuge is running, it will produce very large stress. All high stress parts exposed to wear and / or stress crack corrosion shall be continuously monitored to avoid material leakage. In order to ensure the safe and long-term operation of the equipment, the company recommends customers to regularly inspect the equipment for corrosion
Whether from the advocacy of various environmental protection policies or the original intention of sludge treatment, the realization of "four modernizations" after sludge treatment should be regarded as the ultimate goal. Then, what kind of sludge treatment is adopted by the ultra-high pressure sludge dryer to realize the "four modernizations" of sludge disposal.
Physical treatment refers to the treatment method of changing the composition of wastewater by physical action. The physical treatment methods used in food industry wastewater treatment include screening, skimming, regulation, sedimentation, air flotation, centrifugal separation, filtration, microfiltration, etc. The first five processes are mostly used for pretreatment or primary treatment, and the last three are mainly used for advanced treatment.