Biological nitrogen removal technology implemented under low temperature and low carbon source conditions

Abstract

The invention relates to a biological nitrogen removal technology implemented under the low temperature and low carbon source conditions. An up-flow anoxic / anaerobic reactor (UAAR), a nitration tank and a sedimentation tank are involved in the technology. The UAAR integrates the functions of primary sedimentation, anaerobic treatment, anoxic treatment and sludge thickening. A bottom sludge hopper, with a better water flow state and a larger effective depth, in the reactor provides conditions for sludge to be subjected to anaerobic acidification and generate VFAs in the sludge hopper, a carbon source easy to use biologically is supplemented to the system, and therefore the system can achieve nitrogen removal under the low temperature and low carbon source conditions. Compared with the prior art, only three structures are involved in the technology, the technology is simple, the tedious arrangement of multiple tanks is omitted, the occupied area is reduced, and the construction cost is lowered; an up-flow push mode is adopted for the main structure, namely the novel UAAR, high sludge concentration can be kept, high impact loads can be borne, and through up-flow mixing, stirring energy needed by a traditional technology is greatly lowered; a good nitrogen removal effect can be achieved without adding carbon sources, and the COD of effluent at low temperature, the ammonia nitrogen concentration and the total nitrogen concentration can reach the level A standard; the sludge concentration is high, the SRT is long, and the amount of excess sludge is greatly reduced.

Description

technical field [0001] The invention relates to a biological denitrification process under the condition of low temperature and low carbon source. Background technique [0002] Many sewage treatment plants in my country, especially those in the south, generally have the practical problem of low carbon and high nitrogen and phosphorus in the raw water entering the plant, which has become an important factor restricting biological nitrogen and phosphorus removal. In order to obtain ideal denitrification and phosphorus removal effects, it is necessary to provide sufficient carbon sources to supplement the requirements of denitrification and denitrification electron donors and phosphorus removal requirements. The source is the key to improving nitrogen and phosphorus removal in sewage. At the same time, with the acceleration of urbanization and industrialization, the amount of wastewater produced has increased sharply, the rate of sewage treatment has increased year by year, an...

AI Technical Summary

Problems solved by technology

However, using natural solid organic matter as the carbon source of the denitrification system also has some problems to be solved urgently, such as the need for a long hydraulic retention time, and the quality of the effluent is greatly affected by the external temperature, etc.

In addition, the purpose of the operation of the sewage treatment system is to remove pollutants, and the method of adding carbon sources adds new pollutants to the sewage treatment system, which is not in line with the concept of circular economy

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