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Control method for N2O reduction in sewage biological nitrogen removal process and system

A control method, sewage biological technology, applied in the direction of water treatment parameter control, water pollutants, biological treatment devices, etc., can solve the problems of excessive dosage of exogenous nutrients, excessive aeration, variable influent water quality, etc. , to avoid excess carbon sources, reduce aeration, and reduce energy consumption

Inactive Publication Date: 2018-07-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a fixed time control program is adopted in the treatment, and due to the changeable water quality of the influent, the excess aeration is caused in most of the reactions.
At the same time, in order to ensure the progress of denitrification, the dosage of exogenous nutrients is often excessive.

Method used

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  • Control method for N2O reduction in sewage biological nitrogen removal process and system
  • Control method for N2O reduction in sewage biological nitrogen removal process and system
  • Control method for N2O reduction in sewage biological nitrogen removal process and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] N in a sewage biological denitrification process 2 The control method of O reduction is applied to the SBR treatment process of sewage with a C / N ratio of 8:

[0059] In the water intake stage, set the time T 1 5min;

[0060] In the facultative / anaerobic phase, set the time T 2 5min, set time T 3 is 15min; the set value α is -5, and the set time T 4 30S, set time T 5 90min, the setting value β is -300mV, the exogenous nutrient added is sodium acetate, the average dosage is 10mL each time, and the concentration is 1mg·L -1 , set the time T 6 20min;

[0061] During the aerobic phase, set the time T 7 120min, set time T 8 15min;

[0062] In the water outlet stage, set the time T 9 30min, set time T 10 2min, set time T 11 for 5min.

[0063] After one cycle control treatment of 1L of sewage, it was found through monitoring that the removal rate of ammonia nitrogen reached 99%, and the total amount of sodium acetate added was 12g, N 2 The total amount of O rele...

Embodiment 2

[0065] N in a sewage biological denitrification process 2 The control method of O reduction is similar to that of Example 1, the only difference is that it is applied to the SBR treatment process of sewage with a C / N ratio of 10.

[0066] In the water intake stage, set the time T 1 3 minutes;

[0067] In the facultative / anaerobic phase, set the time T 2 6min, set time T 3 is 20min; the set value α is -5, and the set time T 4 20S, set the time T 5 80min, the setting value β is -300mV, the exogenous nutrient added is sodium acetate, the average dosage is 10mL each time, and the concentration is 1mg·L -1 , set the time T 6 15min;

[0068] During the aerobic phase, set the time T 7 100min, set time T 8 20min;

[0069] In the water outlet stage, set the time T 9 40min, set time T 10 1min, set time T 11 for 3min.

[0070] After a cycle control treatment of 1.5L of sewage, it was found through monitoring that the removal rate of ammonia nitrogen reached 97%, and the tot...

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Abstract

The invention discloses a control method for N2O reduction in a sewage biological nitrogen removal process and a system. According to the method, hydraulic retention time (HRT) of an anaerobic-aerobicsection is controlled by adopting OPR-pH joint control in an anaerobic-aerobic activated sludge nitrogen removal process by using a styrene butadiene rubber (SBR) method, so that the adding amount ofexternal nutrients is automatically controlled; furthermore, the system for realizing the control method is provided. The control method and the system can guarantee stable treated water quality on the basis of controlling discharging of greenhouse gas N2O; the ammonium-nitrogen removal rate can be up to 99 percent or above, and energy consumption can be reduced.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a process for biological denitrification of sewage 2 O reduction control method and system. Background technique [0002] N 2 O is a strong greenhouse gas with a 100-year global warming potential (GWP) of CO 2 300 times that of N in the atmosphere, more than 90% 2 O comes from the nitrogen removal process of microorganisms, where sewage treatment is considered as N 2 An important release source of O. It is estimated that the annual discharge of N in the process of sewage treatment 2 The total amount of O is about (0.3-3)*1012kg, accounting for the global N 2 2.5-25% of total O emissions. Therefore, it is possible to effectively reduce the N 2 The release of O is of great significance for reducing greenhouse gas emissions from anthropogenic activities. [0003] The continuous tightening of sewage discharge standards is a common development trend in all count...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F101/16
CPCC02F3/302C02F2101/16C02F2203/006C02F2209/005C02F2209/04C02F2209/06
Inventor 魏源送陈彦霖陈梅雪柳蒙蒙郁达伟柴玉峰隋倩雯钟慧
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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