Electrochemical-biological coupling closed-circuit treatment method and device for surplus sludge/digestive liquid

A technology for excess sludge and treatment equipment, which is applied in the direction of electrochemical-biological combination treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of increasing system load, affecting the operation of sewage treatment system, and high cost , to achieve the effect of efficient coupling

Active Publication Date: 2021-10-26
太原学院
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  • Description
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Problems solved by technology

The problem faced by this solution is: the total amount of ammonia nitrogen in the sludge digested liquid will account for 20 to 80% of the total amount of ammonia nitrogen in a sewage treatment plant. If these sludge digested liquids are returned to the municipal sewage treatment system, it will cause The system load increases a lot, affecting the operation of the sewage treatment system
[0013] Sludge digestion liquid is a kind of waste water with high ammonia nitrogen, and the carbon-nitrogen ratio is out of balance. The ordinary "nitrification-denitrification" process requires sufficient aeration and the addition of a large amount of carbon source and alkali to remove the total nitrogen in the digestion liquid. , this cost is too high for most sewage treatment plants to bear

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  • Electrochemical-biological coupling closed-circuit treatment method and device for surplus sludge/digestive liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] figure 1 The specific structure of the electrochemical-biological coupling excess sludge / digestive liquid closed-circuit treatment device of the present invention is given, consisting of FNA in-situ generation pool 6, excess sludge FNA pretreatment pool 15, excess sludge treatment reactor 24 and digestive liquid The treatment reactor 35 is formed and equipped with a sludge storage tank 1 and an aeration return column 19 .

[0087] Wherein, the excess sludge treatment reactor 24 and the digestive liquid treatment reactor 35 are both made of plexiglass.

[0088] The excess sludge treatment reactor 24 includes two parts: a reaction zone and a sedimentation zone, and the digestive liquid treatment reactor 35 includes three parts: an aeration distribution chamber 41 , a reaction zone and a sedimentation zone. Among them, the inner diameter of the aeration distribution chamber 41 is 100mm, the height is 0.2m, and the volume is 1.5L; the inner diameter of the reaction zone is...

Embodiment 2

[0108] Take the excess sludge from the former Taiyuan Yangjiabao Sewage Treatment Plant as the excess sludge to be treated. The solid content of the excess sludge is 16%, TS=176.6g∙L -1 , VS=122.8g∙L -1 , VS / TS=0.69.

[0109] The granular sludge is taken from the highly efficient and stable granular sludge reactor (EGSB reactor) for treating urban domestic sewage, and is used to fill the excess sludge treatment reactor and the digestive liquid treatment reactor.

[0110] Micro-aerobic aeration to ensure FNA in-situ production of 0.06mg∙L in the tank -1 FNA (25°C, pH 6.8), the effluent from the FNA in-situ generation pool and the remaining sludge to be treated enter the excess sludge FNA pretreatment tank at the same time, and the pretreatment reaction is 4 hours (FNA pretreats the excess sludge). After pretreatment The excess sludge enters the excess sludge treatment reactor (at this time, the electrode is still in the state of acclimating and cultivating electricity-produci...

Embodiment 3

[0121] Take the excess sludge from the former Taiyuan Yangjiabao Sewage Treatment Plant as the excess sludge to be treated. The solid content of the excess sludge is 16%, TS=176.6g∙L -1 , VS=122.8g∙L -1 , VS / TS=0.69.

[0122] Granular sludge is taken from the highly efficient and stable granular sludge reactor (EGSB reactor) for treating urban domestic sewage to fill the remaining sludge treatment reactor and digestive liquid treatment reactor.

[0123] Micro-aerobic aeration to ensure FNA in-situ production of 0.15mg∙L in the tank -1 FNA (25°C, pH 6.8), the effluent from the FNA in-situ generation pool and the remaining sludge to be treated enter the excess sludge FNA pretreatment tank at the same time, and the pretreatment reaction is 4 hours (FNA pretreats the excess sludge). After pretreatment The excess sludge enters the excess sludge treatment reactor (the electrode is in the state of acclimating and cultivating electricity-producing functional bacteria externally (dir...

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Abstract

The invention discloses an electrochemical-biological coupling surplus sludge / digestive liquid closed-circuit treatment method and treatment device, which simultaneously realizes high-efficiency and low-energy consumption in-situ production of FNA for efficient pretreatment of surplus sludge, high-activity granular sludge and bio-electrode system coupling Dispose of residual sludge and digestate. Relying on the coupling of granular sludge and bioelectrode system in the excess sludge treatment reactor, the coupling of various direct electron transfer modes between species and the intertrophic link between electrogenic bacteria and fermentative microorganisms are realized, thereby ensuring the high yield of excess sludge. Digestibility and high methane production rate. Relying on the coupling of granular sludge and EA-ammox in the digestate treatment reactor, the simultaneous removal of C and N with high efficiency and low energy consumption is realized.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a closed-circuit high-efficiency energy treatment method of electrochemical-biological coupling excess sludge / digestive fluid and a treatment device thereof. Background technique [0002] The main problems faced by the traditional residual sludge anaerobic digestion process include low sludge digestion efficiency (low organic matter utilization rate) and low sludge methane yield (low energy conversion rate). [0003] Regarding the problem of low sludge digestion efficiency, it is first necessary to analyze from the perspective of sludge structure and properties. The remaining sludge mostly exists in the form of bacterial micelles, and its organic part mainly exists in microbial cells and extracellular polymers. For this reason, the efficient dissolution (hydrolysis) of organic matter in sludge becomes the rate-limiting step to improve the efficiency of sludge di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/00
CPCC02F3/005
Inventor 董春娟潘泽康魏玲汪艳霞
Owner 太原学院
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