Energy-saving enhanced nitrogen removal process

A process, denitrification technology, applied in the field of denitrification process, can solve problems such as economic infeasibility

Inactive Publication Date: 2010-11-24
上海昊沧系统控制技术有限责任公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Studies have found that when acetic acid is used as a carbon source, the denitrification rate is at a high level, and it is not economically feasible to directly use acetic acid as an external carbon source, especially for large sewage treatment plants

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Embodiment Construction

[0020] The technical features of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Such as figure 1 , 2 As shown, the energy-saving and enhanced denitrification process of the present invention passes through the biological treatment process of anaerobic zone 1, multi-stage aerobic-anoxic zone 2, final aerobic zone 4 and secondary sedimentation tank 5 in sequence. The multi-level aerobic-anoxic zone 2 includes at least two levels of aerobic sections 201, 203 and anoxic sections 202, 204 arranged in sequence. In this embodiment, there are two stages of aerobic and hypoxic sections 201 and 202 and 203 and 204 . Sewage enters the anaerobic zone 1 for anaerobic fermentation, and then enters the multi-stage aerobic-anoxic zone 2, the final aerobic zone 4, and the secondary sedimentation tank 5 in sequence. discharged, and the rest flows back into the anaerobic zone 1. The effluent after anaerobic fermen...

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Abstract

The invention relates to an energy-saving enhanced nitrogen removal process, sewage sequentially passes through an anaerobic zone, a multi-stage aerobic-anoxic zone and a last-stage aerobic zone to complete the biological treatment process, and mud-water separation is completed in a secondary sedimentation tank. The multi-stage aerobic-anoxic zone comprises at least two stages, and each stage comprises an aerobic section and an anoxic section which are sequentially arranged. Outlet water after passing the anaerobic zone for anaerobic fermentation, one part directly enters into the first-stage aerobic section in the multi-stage aerobic-anoxic zone, and the other part respectively enters into the front ends of all stages of the anoxic sections in the multi-stage aerobic-anoxic zone by diversion through an open channel. The outlet water from the multi-stage aerobic-anoxic zone completely passes through the last-stage aerobic zone and enters into the secondary sedimentation tank for sedimentation, clear solution is discharged, one part of sediment is discharge, and the other part flows back into the anaerobic zone. The energy-saving enhanced nitrogen removal process has the characteristics of leading the denitrification reaction rate to be fast, shortening the reaction time, saving equipment required in the process and saving energy.

Description

technical field [0001] The invention relates to a denitrification process in sewage treatment, in particular to an energy-saving enhanced denitrification process. Background technique [0002] At present, the biological nitrogen and phosphorus removal process is widely used in the field of sewage treatment. Among them, the most widely used is the AAO (anaerobic, anoxic, aerobic) process and various deformation processes evolved on the basis of it. Zones are arranged in series, and reflux is set at an appropriate position in the process, that is, sludge reflux and nitrification liquid reflux are set. Among them, the nitrification liquid reflux is mainly to return the nitrate nitrogen formed by the oxidation of ammonia nitrogen to the anoxic tank to realize denitrification reaction. To achieve the purpose of removing total nitrogen, the reflux flow of nitrification liquid is generally 2 to 4 times that of the wastewater inflow, so the reflux pump facilities and operating cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 范岳峰方荣兆马刚
Owner 上海昊沧系统控制技术有限责任公司
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