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Sewage treatment method for appropriate removal of nitrogen and phosphorus according to the nitrogen content of the secondary effluent

A sewage treatment method and secondary effluent technology, applied in the field of environmental engineering, can solve the problems of lack of precise control of effluent N/P, difficult control of effluent N/P, etc., and achieve good economic value, convenient method and COD reduction effect.

Active Publication Date: 2016-04-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] However, at present, for sewage treatment, nitrogen and phosphorus are removed as much as possible or nitrogen and phosphorus are eliminated at the same time. It is difficult to control the N / P of the effluent, and the N / P of the effluent has a lot to do with the N / P of the follow-up water. Process method for precise control of effluent N / P

Method used

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  • Sewage treatment method for appropriate removal of nitrogen and phosphorus according to the nitrogen content of the secondary effluent
  • Sewage treatment method for appropriate removal of nitrogen and phosphorus according to the nitrogen content of the secondary effluent

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Embodiment

[0050] This embodiment uses subsurface flow wetlands, such as figure 1 As shown, including the treatment pool, water inlet 2 and water outlet 8 are respectively set at the front and back of the treatment pool. The interior of the treatment pool is sequentially composed of wetland plant layer 3, soil layer 4 and filler medium layer from top to bottom, and the filler medium layer is according to the direction of water flow. It is divided into a pre-treatment area 5, an intermediate treatment area 6 and a post-treatment area 7. The pre-treatment area 5, the intermediate treatment area 6 and the post-treatment area 7 respectively contain zeolite and steel slag in different proportions. A buffer zone 1 is provided in front of the treatment tank, a water inlet 2 is located in the upper area of ​​the buffer zone 1, and a water outlet 8 is located in the lower area of ​​the post-treatment area 7 .

[0051] The working parameters of the present embodiment are as follows:

[0052] Para...

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Abstract

The invention relates to a sewage treatment method for nitrogen and phosphorus proper-amount removal according to the nitrogen content of secondary effluent. The secondary effluent is subjected to deep treatment by using a subsurface flow wetland with an artificially mixed medium, and the N / P ratio of the effluent of the subsurface flow wetland is 20-30; different regions of the mixed medium of the subsurface flow wetland contain different ratios of zeolite to steel slag. Compared with the prior art, with utilization of steel slag high-efficiency adsorption phosphorus removal effectiveness and through mixing with other media according to a proportion, the effectiveness of quantitative removal of influent phosphorus is achieved, the wetland effluent nitrogen and phosphorus proportion is optimized, and thus a receiving water body is promoted to have non-toxic green algae growth, and proliferation of toxic microalgae is inhibited.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a sewage treatment method for appropriately removing nitrogen and phosphorus according to the nitrogen content of secondary effluent, and belongs to the technical field of environmental engineering. Background technique [0002] At present, the effluent after the secondary treatment of urban sewage still contains quite a lot of nitrogen and phosphorus. Most of the main forms are nitrate nitrogen, a small part is ammonia nitrogen, and phosphorus of orthophosphate. The concentration level is basically: nitrate nitrogen The ammonia nitrogen is 10-15mg / L, the ammonia nitrogen is 3-5mg / L, and the total phosphorus is about 1-1.5mg / L, which in turn causes continuous pollution of the receiving water body. If it is directly discharged into lakes and rivers or reused, it will cause water damage and eutrophication. [0003] As a typical ecological treatment technology, constructed wetland has t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32
CPCY02W10/10
Inventor 陈秀荣赵建国赵骏江子建何怡萱王璐鲍征闫龙章斐
Owner EAST CHINA UNIV OF SCI & TECH
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