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Real-time control device for regulating and controlling dissolved oxygen to achieve N2O reduction and using method thereof

A real-time control and dissolved oxygen technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water pollutants, etc., can solve the discharge, the limitation of dissolved oxygen, the accumulation of nitrite and the oxidation and impact of hydroxylamine Denitrification and descaling effects and other issues to achieve the effect of improving practicability and controllability, facilitating operation parameters, and optimizing operation effects

Active Publication Date: 2019-06-21
YANGZHOU UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biological denitrification and denitrification process of sewage will also cause the emission of nitrous oxide. The limitation of dissolved oxygen, the accumulation of nitrite and the oxidation of hydroxylamine are all the reasons for the production of nitrous oxide. During the simultaneous denitrification and phosphorus removal process The accumulation of nitrate will also affect the effect of denitrification and descaling

Method used

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  • Real-time control device for regulating and controlling dissolved oxygen to achieve N2O reduction and using method thereof
  • Real-time control device for regulating and controlling dissolved oxygen to achieve N2O reduction and using method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] The C / N in the raw water tank 1 is artificially controlled to be 3, and the real-time control variable is obtained through the output of the computer 20 . When the flowmeters Ⅰ, Ⅱ, and Ⅱ continue to increase, increase the C / N ratio of the raw water tank to 5, and reduce the reflux ratio of the nitrifying liquid to 200% or reduce the aeration rate in the aerobic zone to 3.2mg / L .

Embodiment 2

[0049] NO 3 - -N sensor 36, NO 2 - -N sensor 37 collects the NO in the outlet water tank 6 online 3 - -N, NO 2 - - N concentration, through the output of the computer 20, a real-time control variable is obtained. when NO 3 - -N+NO 2 - - When the N concentration ≥ 9mg / L, prolong the reaction time in the anoxic zone to 6h or reduce the aeration to 1.6mg / L; when NO 3 - -N+NO 2 - - When the N concentration is ≤4mg / L, the time to restore the original anoxic zone is 5.0h.

Embodiment 3

[0051] Gas flowmeter Ⅰ, Ⅱ, Ⅲ, gas chromatograph 19 real-time monitoring N 2 O emissions, combined with NO 3 - -N sensor 36, NO 2 - -N sensor 37 and DO sensor 15 can obtain real-time control variables through the output of computer 20 . When the DO sensor detects that the dissolved oxygen in the anaerobic zone 9 is ≥0.2mg / L (the dissolved oxygen in the aerobic zone 11 is ≥3.2mg / L), reduce the aeration in the aerobic zone and the biological contact oxidation tank 5 to 2.2mg / L; When the flow meter II reading rises, turn on the flow meter to increase the aeration rate of the aerobic zone 11 or the biological contact oxidation tank 5 to 3.2 mg / L.

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Abstract

The invention belongs to the technical field of biological treatment of sewage, and particularly relates to a real-time control device for regulating and controlling dissolved oxygen to achieve N2O reduction and a using method thereof. A DO sensor is placed at each stage of a reaction device, an anaerobic and anoxic reaction is performed in an A<2> / O device, and the N2O release condition is monitored in real time by a gas flow meter and a gas chromatograph; then, precipitation is performed after aerobic and BCO treatment to obtain a supernatant and precipitated sludge respectively, the supernatant enters an outlet water tank, and the precipitated sludge is regularly discharged; the DO sensors are used in the whole process for monitoring the N2O and controlling the dissolved oxygen amount in real time so as to master the N2O emission law in the reaction process. Through the regulation and the control of the dissolved oxygen amount in the whole process, the performance of nitrogen and phosphorus removal is improved; when the dissolved oxygen in an anaerobic zone is less than 0.2mg / L and the dissolved oxygen in an anoxic zone is less than 0.5mg / L, the total N2O emission amount is theleast; due to the aeration for a too long time, nitrate is enriched and the N2O emission amount is increased.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and specifically relates to a method for regulating dissolved oxygen to realize N 2 O decrement real-time control device and method of use thereof. Background technique [0002] In environmental science research, especially in the field of global climate change (Global Climate Change), N 2 O, commonly known as nitrous oxide, is a greenhouse gas (Greenhouse Gas), has a greenhouse effect (Greenhouse Effect), and exacerbates global warming (Global Warming). It is one of the six greenhouse gases stipulated in the Kyoto Protocol. N 2 O stays in the atmosphere for a long time and can be transported to the stratosphere, leading to the destruction of the ozone layer, causing the ozone hole, exposing humans and other organisms to the radiation of ultraviolet rays from the sun, and causing damage to human skin, eyes, and immune system. [0003] Compared with carbon dioxide, although ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/16C02F101/10
Inventor 张淼王一鑫於蒙
Owner YANGZHOU UNIV
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