System and method for treating sanitation station filtrate by external separation and full-membrane method

Abstract

The invention discloses a system for treating filtrate of an environmental sanitation station through the outward-separating integrated membrane technology. The system comprises a gravity oil-separating unit, an ion flotation unit, an anaerobic unit, an aerobiotic unit and a deep purification unit which are sequentially connected, the anaerobic unit comprises an anaerobic sludge expanded bed and an anaerobic membrane separating device, and a mixed liquor return pipe is arranged between the anaerobic membrane separating device and the anaerobic sludge expanded bed; the aerobiotic unit comprises an aerobiotic activated sludge reactor and an aerobiotic membrane separating device, and a sludge return pipe is arranged between the aerobiotic membrane separating device and the aerobiotic activated sludge reactor. According to the system, oil is removed through two steps, on the basis of removal of oil spill and emusified oil in the filtrate, the system of complete flow micro-biological degradation combined with membrane separation is adopted, the microbial morphology, the water producing morphology and the methane morphology are relatively independent in operation mode, the high biological solid concentration, high circulative stirring strength and high solid-liquid separation efficiency are maintained, and organic matter, in particular to macromolecule organic matter which is difficult to degrade, can be degraded.

Description

technical field [0001] The invention relates to a sewage treatment system and method, in particular to a system and a method for treating filtrate from an sanitation station by an external separation full-membrane method. Background technique [0002] At present, the collection, treatment and disposal of municipal solid waste are gradually becoming standardized. Many large cities have established regional and considerable-scale waste transfer stations, namely sanitation stations. The garbage from each residential area and garbage collection point is transported to the sanitation station by the collection trolley and poured into the garbage bins placed in the pit, and then transported out after being compressed. Since the garbage contains a large amount of perishable organic garbage, all of which have a high water content (generally 40-80% moisture content), it is very easy to generate garbage waste liquid, and at the same time, there will be garbage containers and ground was...

AI Technical Summary

Problems solved by technology

Once these wastes are mixed into domestic waste, they will dissolve into the filtrate during the waste pressing process and affect the subsequent treatment process.

Failure to take effective pretreatment measures for these pollutants will lead to failure of anaerobic or aerobic treatment units

[0006] At present, most of the wastewater treatment facilities in sanitation stations that have been built adopt the traditional anaerobic plus aerobic process, without pretreatment units. Under the condition that the anaerobic unit has a weak impact load resistance, the anaerobic treatment load is low and the removal rate is low. Low, the effluent still contains a relatively high concentration of COD

After the wastewater enters the aerobic unit, the amount of aeration is large and the residence time is long. The extracellular enzymes and humic acids remaining in the wastewater are non-biodegradable organic substances. The effluent can only meet the requirements of the third-level standard of the "Comprehensive Discharge Standard", It occupies a large area and the quality of the effluent is unstable, causing load shocks to the terminal sewage plant or causing safety hazards to the surrounding environment

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