Sewage biochemical treatment process and device utilizing active sludge and biological membrane combined circulating flow

Abstract

The invention discloses a sewage biochemical treatment process and device utilizing active sludge and biological membrane combined circulating flow. The process comprises the steps that: pre-treated sewage is introduced into an anoxic area from a main water inlet hole; under the state that sewage and bioactive sludge are fully mixed, anoxic biochemical treatment is carried out; then, the mixture is introduced into an anaerobic area and is mixed with sewage entering the anaerobic area from a secondary water inlet hole; under the state that the sewage and the bioactive sludge are fully mixed, anaerobic biochemical treatment is carried out; then the mixture enters an active sludge and the biological membrane synergic treatment area; sewage mixed liquor forms inner-circulating water flow under the action of plug flow aeration, and circularly and repeatedly flows through a biological membrane filler area and an active sludge mixed aeration area; under the mixing and contacting dual-action of the active sludge and the microorganism on the biological membrane, aerobic biochemical treatment is carried out; and the sewage is discharged after reaching the sewage treatment requirement. The sewage biochemical treatment process combines the biological diversity of the active sludge and the dual characteristics of the biological membrane, is strong in capability of resisting impact load, strong in adaptability and good in sewage treatment effect, and realizes synchronous nitrogen and phosphorus removal.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a biochemical treatment process and device for activated sludge and biofilm combined circulation flow sewage. Background technique [0002] Although 70.8% of the earth is covered by water, fresh water resources are extremely limited. What humans can really use is only part of rivers, lakes and groundwater, accounting for only 0.26% of the total water on the earth, and the distribution is uneven. After the 1950s, the global population increased rapidly, the industry developed rapidly, and the human demand for water resources expanded at an alarming rate; on the other hand, the increasingly serious water pollution eroded a large amount of water resources available for consumption, making global water resources The situation is rapidly deteriorating and the "water crisis" is getting worse. [0003] China's per capita water resources are small and the spatial distribution is uneven. Wi...

AI Technical Summary

Problems solved by technology

When nitrate exists in the anaerobic section, denitrifying bacteria will compete with phosphoric acid bacteria to adsorb organic matter in sewage, and use phosphorus accumulating bacteria as electron acceptors for denitrification, thereby affecting the fermentative acid production of phosphorus accumulating bacteria on organic matter. Phosphorus bacteria cannot obtain enough volatile fatty acids (VFAs), thereby inhibiting the anaerobic phosphorus release of phosphorus accumulating bacteria and the synthesis ability of PHB (poly D-hydroxybutyrate), affecting the phosphorus uptake ability of aerobic phosphorus accumulating bacteria, resulting in the removal of Phosphorus is not effective

[0008] (3) The average residence time of microorganisms in the existing process is not long, which may lead to the loss of microorganisms that proliferate slowly before they can proliferate. For example, nitrifying bacteria with a long generation time are more difficult to proliferate

Therefore, the traditional sewage biochemical treatment methods based on the aerobic activated sludge method and biofilm method are difficult to adapt to the current sewage treatment in my country.

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