A2/O+A/O technique wastewater biological denitrification phosphorous removal process and its device

A nitrogen and phosphorus removal and sewage biological technology, applied in the field of A2/O+A/O process sewage biological nitrogen and phosphorus removal technology and its device, can solve the problem of unstable treatment effect of single sludge biological nitrogen and phosphorus removal process, Low compliance rate and other issues, to achieve the effect of saving COD consumption, reducing sludge production, and reducing oxygen consumption

Active Publication Date: 2008-01-30
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The single sludge biological denitrification and phosphorus removal process caused by carbon source competition is unstable and the compliance rate is low, which is a common problem faced by large-scale biological nutrient removal sewage treatment plants.

Method used

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  • A2/O+A/O technique wastewater biological denitrification phosphorous removal process and its device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] During the test, A 2 / O process adopts synthetic beer wastewater (COD=25 1-406mg / L, total nitrogen TN=44.6-65.4mg / L and total phosphorus TP=7.1-11.5mg / L, C / N=6.5-7.4, C / P=40.1-57.2), the hydraulic retention time is 9h, the sludge age is 10-12d, the sludge concentration is 3500±100mg / L, the sludge reflux ratio is 0.5, the pH of the influent is controlled at 7.2-7.6, and the temperature is controlled by the heating rod. 20-23°C,. The test results show that the ratio of denitrification phosphorus uptake to aerobic phosphorus uptake is 15%, COD removal rate is 85%, TN and TP removal rates are 69% and 75% respectively.

example 2

[0034] During the test, the A / O process was adopted to adopt artificially synthesized beer wastewater (COD=25 1-406 mg / L, total nitrogen TN=44.6-65.4mg / L and total phosphorus TP=7.1-11.5mg / L, C / N= 6.5-7.4, C / P=40.1-57.2), hydraulic retention time 9h, sludge age 10-12d, sludge concentration 3500±100mg / L, sludge reflux ratio 0.5, control influent pH to stabilize at 7.2-7.6, The temperature is controlled at 20-23°C by a heating rod. The test results show that the ratio of denitrification phosphorus uptake to aerobic phosphorus uptake is 0%, COD removal rate is higher than 86%, TN and TP removal rates are 76% and 15% respectively.

example 3

[0036] During the test, A 2 / O+A / O process synthetic beer wastewater (COD=222-256 mg / L, total nitrogen TN=67-73mg / L and total phosphorus TP=6.3-6.8mg / L, C / N=3.4-3.9, C / P=35.2-38.5), the hydraulic retention time is 9h, the sludge age is 10-12d, the sludge concentration is 3500±100mg / L, the sludge reflux ratio is 0.5, the pH of the influent is controlled at 7.2-7.6, and the temperature is controlled by the heating rod Control at 20-23°C, turn on the aeration when investigating low C / N ratio, and turn off the mixer and bypass pump. from A 2 The test results of / O+A / O process show that (Figure 1, 2 and 3), the ratio of denitrification phosphorus uptake to aerobic phosphorus uptake is 45%, COD removal rate is higher than 80%, TN and TP removal The rates were 71% and 83%, respectively.

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Abstract

The invention pertains to a field of the technique development of sewage treatment system. The invention is designed to solve the problem of instability and low standard-reaching rate of biological denitrification and phosphorus removal technic A2/O. The problem is caused by the competition of carbon source. The invention is based on the theory of dephosphorization and denitrification by denitrification and reasonably takes the advantage of the idea that intake carbon sources can be used instead of additional carbon sources to improve denitrification rate. The invention is designed to update the technic A2/O to the technic (A2/O+A/O) of anaerobia-anoxia 1-aerobic 2-anoxia 2-aerobic 2, and the invention can also optimize the nutrient removal ability of the technic (A2/O+A/O) by starting the switches of aeration and stirring and side-flow pump in anoxia 2 zone according to different quality and quantity of intake water. The invention can also fully exert the denitrification phosphorus removal performance and effectively use the intake carbon source within the technic (A2/O+A/O), can effectively improve water quality, evidently reduces operation cost and reforms operation status. The invention is applicable to urban sewage treatment which demands on a nutritive matter emission standard.

Description

technical field [0001] The technical field of the invention is: process development of sewage biological treatment system. Background technique [0002] (1) Anaerobic-anoxic-aerobic process [0003] Anaerobic-anoxic-aerobic process, referred to as A 2 O process (Anaerobic / Anoxic / Aerobic, abbreviated as A 2 O), as the simplest synchronous denitrification and phosphorus removal process on the system, it is widely used in large-scale sewage treatment plants at home and abroad, but the process alternately operates three different environmental conditions of anaerobic, anoxic and aerobic and different types of Microbial flora such as phosphorus accumulating bacteria, denitrifying bacteria, and nitrifying bacteria coexist in the same sludge system, and there must be nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria in different sludge ages and carbon source disputes, and at the same time return to the sludge The carried nitrate also inhibits the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 彭永臻王晓莲王淑莹
Owner BEIJING UNIV OF TECH
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