Sewage treatment technique for denitrifying denitrification and descaling

Abstract

This invention relates to a new sewage treatment technique by denitrifying nitrogen and phosphorus removal, which comprises a reactor and two sludge pools. In this technique, pollutants are removed by interaction between two kinds of sludge, which conquers the disadvantages in conventional nitrogen and phosphorus removal techniques. Besides denitrifying phosphorus bacteria, ordinary phosphorus accumulating bacteria are also utilized, which eliminates the drawback of denitrifying phosphorus removal technique. In this invention, water cycling is replaced by sludge cycling, therefore power for driving water cycling is saved and aeration and sludge amount can be lowered by approximately 20% and 30%, respectively, compared to ordinary techniques. It is suitable for life sewage disposal in rural areas and small towns.

Description

1. Technical field [0001] The invention belongs to the technical field of environmental engineering water treatment, and is particularly suitable for the treatment of domestic sewage in rural areas and small towns. 2. Background technology [0002] Nitrogen and phosphorus removal is a major problem in the field of sewage treatment. Traditional A 2 / O, improved A 2 Although processes such as / O and oxidation ditch generally have the effect of nitrogen and phosphorus removal, there are many reactors, complex processes, and high energy consumption. Often, the nitrogen removal effect is good and the phosphorus removal effect is poor, or the opposite situation occurs. In order to obtain a better nitrogen and phosphorus removal rate at the same time, it is necessary to increase the sludge return flow or add an external carbon source, which not only increases the operating cost of the process, but also produces a large amount of excess sludge. Most of the sewage treatment proces...

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Problems solved by technology

Denitrification phosphorus removal is a newly emerging green and sustainable new technology. It uses nitrate instead of oxygen as the electron acceptor for phosphorus removal, and combines the denitrification and phosphorus removal processes, which can overcome the traditional process of denitrification and removal. The contradiction between phosphorus, reducing aeration, and reducing sludge production, but denitrification phosphorus removal technology also has the disadvantages of low phosphorus removal efficiency, phosphorus and nitrate need to meet a certain ratio, etc., which limits its application in actual sewage treatment. application in

Chinese Literature "A 2 N Denitrification Phosphorus and Nitrogen Removal Process and Its Influencing Factors” (2003, 19(9): 8-11) reported the continuous flow denitrification dephosphorus and nitrogen removal process, which has many reactors and requires the circulation of sewage and sludge , did not solve the contradiction of incomplete removal of phosphorus when the ratio of phosphorus and nitrate was out of balance

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