Method for sludge decrement by using endogenous denitrification denitrification dephosphorization and reaction system

An endogenous denitrification and biological denitrification technology, which is applied in the field of sludge reduction reaction system, can solve the problems of weakened removal of nutrients such as nitrogen and phosphorus, poor sludge settling performance, and increased energy consumption of sewage treatment. Achieve the effect of promoting sludge reduction, long residence time, and realizing sludge reduction

Inactive Publication Date: 2008-05-21
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing sludge reduction technologies will lead to increased energy consumption of sewage treatment, poor sludge settling performance, weakened removal ...

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  • Method for sludge decrement by using endogenous denitrification denitrification dephosphorization and reaction system
  • Method for sludge decrement by using endogenous denitrification denitrification dephosphorization and reaction system

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specific Embodiment approach 1

[0011]Specific embodiment one: illustrate in conjunction with Fig. 1, utilize endogenous denitrification biological denitrification and dephosphorization in the present embodiment to make the method for sludge reduction be completed through the following steps: 1. The supernatant of middle sedimentation tank 8 reflux The sludge and the influent of liquid and sludge anaerobic tank 4 return, in the aerobic oxidation tank 2, remove most of the organic matter in the sewage through the aerobic oxidation of aerobic heterotrophic bacteria; Sewage enters the aerobic biofilm nitrification tank 3, and in the aerobic biofilm nitrification tank 3, ammonia nitrogen is converted into nitrate nitrogen through the nitrification of the aerobic autotrophic nitrifying bacteria group; Salt nitrogen sewage enters the anoxic denitrification tank together with the return sludge from the middle sedimentation tank, and the phosphorus accumulating bacteria use nitrate as the electron acceptor to consume...

specific Embodiment approach 2

[0014] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 7, the reflux ratio of the sludge returned to the aerobic oxidation tank 2 and the sludge returned to the middle sedimentation tank 8 is controlled between 0.5 and 0.6 between. Other reaction steps are the same as in Embodiment 1.

specific Embodiment approach 3

[0015] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step 7, the reflux ratio of the sludge returned to the aerobic oxidation tank 2 and the sludge returned to the middle sedimentation tank 8 is 0.55. Other reaction steps are the same as in Embodiment 1.

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Abstract

The invention discloses a method and a reaction system for reducing sludge by using endogenous denitrification biological denitrification and dephosphorization, belonging to the field of sewage treatment. It solves the problems that the existing sludge reduction technology will increase the energy consumption of sewage treatment, deteriorate the sludge settling performance, weaken the removal effect of nutrients such as nitrogen and phosphorus, and easily cause secondary pollution. The invention utilizes the soluble COD produced in the sludge thickening anaerobic process as the carbon source for the anaerobic phosphorus release by the phosphorus accumulating bacteria to realize nitrogen and phosphorus removal. The sludge multiplied in the sewage treatment process is anaerobic-aerobic coupled and the sludge return section is inserted into the sludge anaerobic tank, and the concentrated sludge is anaerobically treated to achieve sludge reduction. The sludge yield of the invention can be reduced by 40-60%, the removal rate of organic matter is stable above 90%, and the removal rates of total nitrogen and total phosphorus are respectively above 86% and 72%. The invention has the advantages of low investment and operation cost, high denitrification and dephosphorization effect, effective realization of sludge reduction and low secondary pollution. The reaction system of the invention has a simple structure and is easy to operate.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a reaction system and method for reducing sludge by using endogenous denitrification biological denitrification and dephosphorization. Background technique [0002] At present, more than 80% of the sewage treatment plants in the world use the activated sludge method to treat sewage. Its biggest drawback is that it produces a surprising amount of excess sludge while treating sewage. A large amount of residual sludge produced in sewage biological treatment usually contains a considerable amount of toxic and harmful substances (such as parasite eggs, pathogenic microorganisms, heavy metals) and unstabilized organic matter. If not properly treated and disposed of, it will cause environmental damage. direct or potential contamination. The cost of excess sludge treatment and disposal is as high as 60-70% of the wastewater treatment cost. It is obvious that the treatment and disposal of...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 王建芳赵庆良王琨刘志刚
Owner HARBIN INST OF TECH
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