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A way to regulate dissolved oxygen to achieve n 2 oReal-time control device for volume reduction and method of use thereof

A real-time control, dissolved oxygen technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve discharge, dissolved oxygen limitation, nitrite accumulation and hydroxylamine Oxidation, affecting denitrification and descaling effects and other issues, to achieve the effects of improving practicability and controllability, optimizing operation effects, and reducing emissions

Active Publication Date: 2022-01-18
YANGZHOU UNIV
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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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  • A way to regulate dissolved oxygen to achieve n <sub>2</sub> oReal-time control device for volume reduction and method of use 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 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. In the present invention, DO sensors are placed at each stage of the reaction device, and in A 2 / O device for anaerobic anoxic reaction, real-time monitoring of N by gas flow meter and gas chromatograph 2 The release of O; after aerobic and BCO treatment, sedimentation is carried out, and the supernatant and sedimentation sludge are obtained respectively. The supernatant enters the effluent tank, and the sedimentation sludge is discharged regularly; the whole DO sensor is used to monitor the N in real time. 2 O and control the amount of dissolved oxygen to master the N during the reaction process 2 O emission law. The present invention improves the performance of denitrification and phosphorus removal by regulating the content of dissolved oxygen in the whole process. The dissolved oxygen in the anaerobic zone is lower than 0.2mg / L, and the total N2O emission is the least when the dissolved oxygen in the anoxic zone is lower than 0.5mg / L. Time aeration will enrich nitrate and increase N2O emissions.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/16C02F101/10
Inventor 张淼王一鑫於蒙
Owner YANGZHOU UNIV
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