Method for recycling heavy sludge and enhancing nitrogen and phosphorus removal

A technology for nitrogen and phosphorus removal and sludge removal, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of increased operating costs, poor removal effect, and activated sludge concentration Low-level problems, to achieve the effect of strong impact load resistance, increased sludge specific gravity, and rapid sludge settlement

Inactive Publication Date: 2018-01-16
上海同济普兰德生物质能股份有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] The water resource crisis has become one of the greatest challenges faced by human beings in the 21st century. The existing sewage treatment plants in my country are mainly aimed at organic carbon pollutants, and the removal effect of nitrogen and phosphorus elements is poor, and nitrogen and phosphorus are the main causes of water pollution. The main nutrients of eutrophication. With the increasing eutrophication of water bodies and the improvement of water quality requirements for sewage treatment plants, the denitrification and phosphorus removal of urban sewage has attracted much attention.
[0003] At present, the widely used biological nitrogen and phosphorus removal process is A 2 / O sewage treatment process, this process solves the problem of denitrification and dephosphorization of sewage to a certain extent, but there are the following problems: 1. The concentration of activated sludge is low, which affects the stability of ammonia nitrogen in the effluent; 2. The treatment load is affected by the sludge Settling performance limitations cannot be further improved
The traditional process often increases the sludge concentration by adding fillers in the aeration tank or increasing the sludge return flow, that is, the external return flow, to increase the treatment load, but adding fillers makes the operation more complicated, increases the operating cost, and increases the sludge return flow It is also limited by the sludge settling performance of the secondary settling tank

Method used

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  • Method for recycling heavy sludge and enhancing nitrogen and phosphorus removal
  • Method for recycling heavy sludge and enhancing nitrogen and phosphorus removal

Examples

Experimental program
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Effect test

Embodiment 1

[0026] like figure 1 As shown, a method for heavy sludge recovery and enhanced denitrification and phosphorus removal is realized by the following device, which is made of plexiglass, including an anaerobic tank, anoxic tank, and an aerobic tank connected in sequence. Gas tank and secondary sedimentation tank, the volume ratio of the anaerobic tank, anoxic tank, and aerobic tank is 1:2:5, and the total effective volume is 52.5L, the effective volume of the secondary sedimentation tank is 26L, and the anaerobic tank Stirring and mixing with the anoxic tank is adopted, and the aerobic tank is fixed at the bottom to supply oxygen and promote liquid mixing at the same time. The inflow, sludge and nitrification liquid return are all controlled by peristaltic pumps; The influent water is connected to the back pipe of the pretreatment unit; part of the mixed liquid in the aerobic tank is returned to the anoxic tank through the mixed liquid return pipe; The sludge output end, the hyd...

Embodiment 2

[0039] like figure 2 As shown, a method for heavy sludge recovery and enhanced denitrification and phosphorus removal is characterized in that the method is realized by the following devices, including an anaerobic tank, an anoxic tank, an aeration tank as an aerobic tank and In the secondary settling tank, the sewage input end of the anaerobic tank is connected with the sewage influent through the rear pipeline of the pretreatment unit; part of the mixed liquid in the aerobic tank is returned to the anoxic tank through the mixed liquid return pipeline; the bottom of the secondary settling tank is set There is a return sludge output end, and the secondary settling tank is connected to the anaerobic tank through the return sludge output end, hydrocyclone or centrifuge, heavy sludge return pipeline connected in sequence, and the secondary settling tank is also equipped with an outlet pipe, so The excess sludge discharge pipe is set on the output end of the return sludge, when t...

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Abstract

The invention provides a method for recycling heavy sludge and enhancing nitrogen and phosphorus removal, wherein the method comprises the following steps: (1) successively introducing sewage passingthrough a pretreatment unit into an anaerobic pool, an anoxic pool and an aerobic pool; (2) making the mixed liquid treated by the aerobic pool partially flow back to the anoxic pool, and introducingthe remaining part into a secondary sedimentation pool; and (3) introducing all or a part of sludge produced by the secondary sedimentation pool into a hydrocyclone or a centrifuge, carrying out cyclone or centrifugal treatment, allowing heavier sludge to flow back to the anaerobic pool by a heavy sludge reflux pipeline, allowing lighter sludge to enter a sludge treatment system through sludge discharge, and discharging a supernatant generated by the secondary sedimentation pool through a water outlet pipeline. The method overcomes the problem that the sludge concentration of a traditional active sludge treatment method is limited by sludge sedimentation performance of the secondary sedimentation pool and cannot be improved further, has good adaptability to water quality, and has strong anti-shock loading capability; and the wastewater treatment method does not have the problem of sludge expansion.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for strengthening the effect of traditional nitrogen and phosphorus removal by recycling heavy sludge. Background technique [0002] The water resource crisis has become one of the greatest challenges faced by human beings in the 21st century. The existing sewage treatment plants in my country are mainly aimed at organic carbon pollutants, and the removal effect of nitrogen and phosphorus elements is poor, and nitrogen and phosphorus are the main causes of water pollution. The main nutrients of eutrophication. With the continuous aggravation of eutrophication in water bodies and the improvement of water quality requirements for sewage treatment plants, the denitrification and phosphorus removal of urban sewage has attracted much attention. [0003] At present, the widely used biological nitrogen and phosphorus removal process is A 2 / O sewage treatment process, this proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 戴晓虎鲁骎薛勇刚刘文静陈小华
Owner 上海同济普兰德生物质能股份有限公司
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