Method for low-temperature denitrification coupled with production of acetic acid by directional fermentation of organic waste under control of redox mediator

A technology for organic waste and organic matter, which is applied in chemical instruments and methods, anaerobic digestion treatment, water pollutants, etc., can solve the problems of effluent COD exceeding the standard and other problems, so as to solve the problem of insufficient denitrification efficiency, improve denitrification efficiency and carbon source utilization. rate effect

Active Publication Date: 2018-05-01
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problems that some ammonia nitrogen and excess organic matter may be produced during the fermentation process, which may cause the effluent COD to exceed the standard, the present invention sets an aerobic-anoxic process after denitrification to improve the oxygen utilization rate and nitrification rate, and ensure that the effluent COD and TN discharge meet the standards.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The redox mediator used is riboflavin, and the organic matter in the fermentation pretreatment is the residual sludge of the sewage treatment plant (30% primary sedimentation sludge + 70% secondary sedimentation sludge), and the concentration of organic matter in the fermentation system is TCOD=18000mg L -1 , the dosage of redox mediator is 10mg / L, the fermentation inoculation sludge comes from the sludge anaerobic digester, and the inoculation concentration is 5g / L. In the fermentation system, the pH value is controlled at 6.0~6.5, HRT=48h, in order to accelerate mass transfer, a submerged stirrer is used for stirring, and the G value is 100S -1 . After solid-liquid separation (gravity precipitation), the concentration of acetic acid in the fermentation supernatant is 4860 mg·COD·L -1 .

[0023] In the biological denitrification system, the A / O / A continuous flow operation mode is used, and the sludge concentration is 3.5g·MLVSS·L -1 , the SRT is 25d, the system oper...

Embodiment 2

[0025] The redox mediator used is manna quinone, the organic matter of fermentation pretreatment is starch wastewater (has undergone chemical phosphorus removal), and the concentration of organic matter in wastewater is TCOD=1800mg L -1 , the fermentation system is a UASB continuous flow reactor, and the dosage of redox mediator is 2.6mg / L. The inoculum sludge in UASB comes from the UASB reactor of the starch wastewater treatment plant. The sludge concentration is 4g / L, the pH value of the wastewater is 6.0-7.0, and the HRT=40h. In order to accelerate mass transfer, a submerged flow mixer is used for stirring, and the G value is 50S -1 . The concentration of acetic acid in the UASB effluent fermentation broth is 1160 mg·COD·L -1 .

[0026] The biological denitrification system is a sequencing batch reactor, which adopts the A / O / A operation mode, and the sludge concentration in the reactor is 3.0g·MLVSS·L -1, the SRT is 30d, the system operates at low temperature for 57d, t...

Embodiment 3

[0028] The redox mediator used is humic acid, and the organic matter in the fermentation pretreatment is reed dead leaf biomass, which is prepared after grinding and the concentration of organic matter is TCOD=8000mg·L -1 The turbid liquid, the dosage of redox mediator in the fermentation system is 15mg / L. The fermented inoculated sludge was from the UASB reactor of the starch wastewater treatment plant, and the inoculum concentration was 3 g / L. In the fermentation system, the pH value is controlled at 5.5-6.5, HRT=50h, in order to accelerate mass transfer, a submerged flow mixer is used for stirring, and the G value is 100S -1 . After solid-liquid separation (gravity precipitation), the concentration of acetic acid in the fermentation supernatant is 2100 mg·COD·L -1 .

[0029] The biological denitrification system is A / O / A continuous flow operation mode, and the sludge concentration is 4.0g·MLVSS·L -1 , the SRT is 30d, the system operates at low temperature for 45d, the t...

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Abstract

The invention discloses a method for low-temperature denitrification coupled with the production of acetic acid by the directional fermentation of organic waste under the control of a redox mediator.The method utilizes the electron transport function of the redox mediator (RM) to catalyze organic matters to directionally and rapidly ferment to produce the acetic acid; in addition, the redox mediator can also serve as an electron transporter to accelerate the transfer of the highly efficient electron donor (the acetic acid) to an electron acceptor (nitrate nitrogen), consequently, a denitrification rate and a carbon source utilization rate are increased, and the problem that the efficacy of denitrification of municipal wastewater with a low carbon-to-nitrogen ratio under the condition of low temperature in winter is deficient is effectively solved. For the problems that partial ammonia nitrogen and excessive organic matters can be produced in the process of fermentation to cause the COD (chemical oxygen demand) of effluent water to exceed the standard, and the like, the method sets an aerobic-anaerobic process after denitrification, consequently, an oxygen utilization rate and a nitrification rate are increased, and the up-to-standard discharge of COD and TN of the effluent water is ensured.

Description

technical field [0001] The invention belongs to the field of biological denitrification of sewage in sewage treatment plants, and in particular relates to a method for biological denitrification of sewage by using redox mediators to regulate organic waste directional fermentation to produce acetic acid coupled with sewage denitrification under low temperature conditions. Background technique [0002] Nitrogen (ammonia nitrogen, nitrate nitrogen, organic nitrogen) is an important indicator of water eutrophication. In order to comprehensively control the risk of eutrophication in water bodies, many urban sewage treatment plants have carried out standard upgrades to ensure stable denitrification effects and strictly control the effluent total nitrogen (TN) index. The nitrification (aerobic)-denitrification (anoxic) process is an effective method to achieve efficient denitrification of sewage, and the denitrification process in the anoxic tank is the key to the final removal of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/28C02F101/16C02F101/30
CPCC02F3/2846C02F3/302C02F2101/16C02F2101/30
Inventor 黄进刚李家浩吴卫红王燕婷郑家亮王欢赵鑫宇余梦超蒋骏
Owner HANGZHOU DIANZI UNIV
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