Combined anoxic/aerobic enhanced biological activated carbon dynamic membrane nitrogen and phosphorus removal process

Abstract

The invention relates to a combined anoxic / aerobic enhanced biological activated carbon dynamic membrane nitrogen and phosphorus removal process. Enhanced biological activated carbon is cultured by using a microorganism inoculation and acclimatization method; and after domestic sewage is treated, effluent is filtered by a dynamic membrane which is pre-coated with the enhanced biological activated carbon. Powdered activated carbon is added to maintain the high sludge concentration in a reactor. The high sludge concentration can reinforce endogenous denitrification; the problem of nitrogen and phosphorus removal in a treatment process is solved by using a biological phosphorus removal process of the aerobic phosphorus uptake of phosphorus-accumulating bacteria synthetically; the solid-liquid separation of mixed liquid is realized by using the high-efficiency entrapment capability of the dynamic membrane, so that the effluent is filtered. The reactor used by the invention has the advantages of compact structure, simple construction, high contamination removal efficiency and convenient operation, management and maintenance. In the process, advanced nitrogen and phosphorus removal treatment can be performed under the condition of not adding extra carbon sources, and the effluence can meet the national recycled water standard. Dominant bacteria such as loss-easy nitrifying bacteria, denitrifying bacteria, phosphorus-accumulating bacteria and the like are grown in a way that the bacteria are attached to the surface of the powdered activated carbon. The enhanced biological activated carbon dynamic membrane has the advantages of large flux, short hydraulic retention time and capability of improving treatment efficiency.

Description

technical field [0001] The invention belongs to the technical field of domestic sewage bioaugmentation, and in particular relates to a combined anoxic / aerobic bioaugmentation activated carbon dynamic membrane denitrification and phosphorus removal process. Background technique [0002] The National Pollutant Discharge Standard for Urban Sewage Treatment Plants (GB18918-2002) sets strict limits on nitrogen and phosphorus indicators in the effluent of urban sewage treatment plants. Sewage treatment requires both phosphorus removal and Nitrogen removal is required, so the process selection should comprehensively consider the requirements of phosphorus and nitrogen removal, take into account the functions of the two, and coordinate the contradiction between the two. Existing phosphorus and nitrogen removal processes adopted by some old urban sewage treatment plants, commonly used are A 2 / O, UCT, SBR, oxidation ditch and other forms. It should be said that large urban sewage tr...

AI Technical Summary

Problems solved by technology

Compared with the two, using the secondary sedimentation tank for solid-liquid separation, the process of sewage treatment is longer and occupies a large area, which also hinders the promotion and application of biological methods for water treatment to a certain extent; the use of membrane separation technology for solid-liquid separation Liquid separation, traditional ultrafiltration and microfiltration membranes are expensive, and membrane fouling is difficult to control

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