Farming wastewater anaerobic treatment process

Abstract

The invention discloses a farming wastewater anaerobic treatment process. The farming wastewater anaerobic treatment process comprises the following steps of 1) transforming a USR (upflow anaerobic sludge reactor), feeding in farming wastewater for anaerobic treatment and collecting the produced biogas inside a biogas tank; 2) discharging the effluent of the USR into a precipitation system for natural precipitation, discharging produced sludge, and collecting the produced biogas into the biogas tank; (3) discharging the supernatant of the precipitation system into a UASB (upflow anaerobic sludge bed) for anaerobic treatment, and collecting the produced biogas into the biogas tank; 4) discharging the effluent of the UASB into a biochemical system for subsequent treatment; 5) desulfurizing,dewatering and then feeding the biogas in the biogas tank into a boiler system for combustion, of which produced heat energy is applied to ensuring normal operation of the USR and the UASB at low temperature, and collecting and storing superfluous biogas. The farming wastewater anaerobic treatment process can be directly applied to processing manure-submerged farming wastewater and meanwhile ensure that processed wastewater can completely meet the requirements of the UASA on low solid content and the UASB can work normally in winter in northern cold regions.

Description

technical field [0001] The invention relates to an anaerobic treatment process for aquaculture sewage, which belongs to the technical field of sewage treatment. Background technique [0002] The concentration of organic matter in aquaculture sewage is extremely high, and it is very difficult to treat it. The anaerobic process has a good treatment effect on organic matter, a high removal rate, and can also generate biogas, with small investment and low operating costs. It is currently a front-end treatment process for aquaculture sewage that is widely used at home and abroad. Flow Anaerobic Sludge Bed Reactor (UASB), Completely Mixed Anaerobic Reactor (CSTR), Internal Circulation Anaerobic Reactor (IC), Upflow Anaerobic Fixed Bed Reactor (USR), etc. [0003] At present, at home and abroad, the treatment effect is further improved by combining multi-stage anaerobic reactors in series, such as: USR+UASB combined with anaerobic treatment of dry feces and sewage to increase the ...

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Problems solved by technology

[0004] 1) It is only suitable for treating dry feces and sewage: According to national regulations, the concentration of suspended solids in UASB water should not exceed 2000ppm, otherwise it will easily lead to blockage of the three-phase separator inside UASB, which will lead to failure of anaerobic process and even lead to back-end biochemical The system load is too high and paralyzed, and the traditional USR at the front end is difficult to control the solid content of the effluent without a three-phase separator, so it is difficult to meet the water inlet requirements of the back-end UASB, so it is only suitable for treating low solid content. The dry cleaning of fecal aquaculture sewage, but the feasibility of blistering fecal sewage is not high;

[0005] 2) It is not suitable for the northern cold regions: to maintain the normal operation of USR and UASB, the temperature needs to be kept above 15°C. In the northern cold regions, the winter temperature is much lower than 15°C. Requires additional heating system to operate properly, which can significantly increase processing costs

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