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Method for reinforcing nitrogen and phosphorous removal from sewage by utilizing anaerobic environment of pipeline

A technology for denitrification, phosphorus removal, and sewage, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., to achieve enhanced denitrification, strong practicability and guaranteed denitrification effect Effect

Active Publication Date: 2011-07-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such methods are rarely reported at home and abroad, and have great application prospects in the process of renovation and expansion of old sewage plants

Method used

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  • Method for reinforcing nitrogen and phosphorous removal from sewage by utilizing anaerobic environment of pipeline

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: Under normal conditions, the influent water quality of a treatment plant in Pudong, Shanghai: COD is 100-180mg / L, ammonia nitrogen is 15-25mg / L, total nitrogen is 20-35mg / L, and total phosphorus is 1.0-4.0 mg / L. Adopt 50% reflux ratio of nitrification liquid and 100% sludge reflux ratio, control the dissolved oxygen in the first aerobic tank 3 and the second aerobic tank 4 at 1.5mg / L, the effluent water quality can reach: COD below 20mg / L , the removal rate is about 10-15%, the total nitrogen is 10-15mg / L, the total phosphorus is below 1.2mg / L, and the ammonia nitrogen removal rate is over 96%.

Embodiment 2

[0023] Example 2: The treatment effects of this process were investigated respectively for the high-concentration influent and low-concentration influent of a sewage treatment plant in Pudong, Shanghai. Under high-concentration influent conditions, the influent COD is 178.74mg / L, TN is 35.75mg / L, TP is 2.55mg / L, ammonia nitrogen is 31.47mg / L, and TSS is 343mg / L. After system treatment, the effluent COD TN was 21.41mg / L, TN was 19.51mg / L, TP was 1.26mg / L, ammonia nitrogen was 0.34mg / L, and TSS was 19mg / L. Under low-concentration influent water conditions, the influent COD is 99.93mg / L, TN is 19..99mg / L, TP is 1.43mg / L, ammonia nitrogen is 17.59mg / L, and TSS is 192mg / L. After system treatment, The effluent COD is 12.62mg / L, TN is 10.99mg / L, TP is 0.71mg / L, ammonia nitrogen is 0.37mg / L, and TSS is 11mg / L.

Embodiment 3

[0024] Example 3: For the influent water quality of a sewage treatment plant in Pudong, Shanghai in summer (June) and winter (January), the treatment effect of this process under different temperature conditions is: when the temperature is higher in summer (25°C), it can Ensure that the effluent TN is 5-15mg / L, TP is below 1.2mg / L, and COD is below 20mg / L, with an average removal rate of 55.0%, 51.0% and 88.9% respectively. Under low temperature conditions in winter (15°C), the nitrification process will be greatly affected. The effluent TN is basically maintained at about 10mg / L, TP is below 0.5mg / L, and COD is below 15mg / L. The average removal rate reaches 49.9%, 72.0% and 88.7%, the denitrification effect is not as good as that in summer, but due to the decrease of total phosphorus load, the phosphorus removal effect is stronger than that in summer.

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Abstract

The invention relates to a method for reinforcing nitrogen and phosphorous removal from sewage by utilizing anaerobic environment of a pipeline. The method comprises the following specific steps: the municipal sewage enters into an anaerobic tank, an anoxic tank and a first aerobic tank in sequence from a first sewage inflow point, part of the nitration solution at the tail end of the first aerobic tank flows back to the initial end of the anoxic tank, the sludge mixed solution and the sewage entering from a second sewage inflow point are mixed, enter into a sewage pipeline and then enter into a second aerobic tank to complete organic matter degradation and nitration process, and at the same time, the nitration solution flows back to the initial end of a sludge pipeline and enters into a secondary sedimentation tank to undergo sludge and water separation, part of the sludge flows back to the initial end of the anaerobic tank and the residual sludge is discharged, wherein the DO (dissolved oxygen) in the anaerobic tank is controlled below 0.1mg / L; the DO in the anoxic tank is controlled below 0.5mg / L; and the DO in the first aerobic tank and the second aerobic tank is 1.0-2.0mg / L. The process has the beneficial effects of ensuring reasonable hydraulic retention time and proper backflow ratio by controlling two-point inflow, two stages (anaerobic stage and aerobic stage), two-stage nitration solution backflow and the like and achieving the aim of reinforcing the effect of nitrogen and phosphorous removal from sewage aiming at the municipal sewage with low carbon-nitrogen ratio.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to a method for strengthening the denitrification and dephosphorization of sewage by utilizing the pipeline anoxic environment. Background technique [0002] In recent years, with the rapid economic development, my country's annual sewage discharge is about 40-50 billion m 3 , and among them, only 15%-25% are discharged after treatment, and a considerable part of the sewage after traditional secondary treatment can remove most of the suspended solids and organic matter, but there is still a lot of nitrogen remaining , phosphorus and other nutrient element pollutants, resulting in varying degrees of pollution (especially eutrophication) in many rivers in our country, and the water environment is deteriorating day by day. Excessive discharge of nitrogen and phosphorus is the main cause of eutrophication in water bodies. Strict control of point source ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 王荣昌励建全杨殿海司书鹏郑翔张衡汇
Owner TONGJI UNIV
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