CN103739070A - Low-energy-consumption municipal wastewater recycling method - Google Patents

Low-energy-consumption municipal wastewater recycling method Download PDF

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Publication number
CN103739070A
CN103739070A CN201310732549.5A CN201310732549A CN103739070A CN 103739070 A CN103739070 A CN 103739070A CN 201310732549 A CN201310732549 A CN 201310732549A CN 103739070 A CN103739070 A CN 103739070A
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mfc
mbr
carbon felt
membrane
unit
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CN201310732549.5A
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李秀芬
聂鹏飞
任月萍
王新华
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Jiangnan University
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Jiangnan University
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Abstract

The invention provides a low-energy-consumption municipal wastewater recycling method, belonging to the technical field of resourcezation of wastewater. Municipal wastewater is treated by adopting a membrane bioreactor (an aerobiotic biotechnology) coupled with a microbial fuel battery (an anaerobic biotechnology), electric energy consumption of the membrane bioreactor is compensated by electric energy generated by the microbial fuel battery, and meanwhile, the surface of a membrane bioreactor assembly as the negative pole of the microbial fuel battery is charged by negative electricity to generate electrostatic repulsion so as to effectively alleviate membrane pollution. In addition, a carbon felt which is 0.5-1.0cm thick is adopted to replace a proton exchange membrane in a common microbial fuel battery, so that the construction cost of the system is greatly lowered. Compared with conventional membrane bioreactor systems, wastewater treatment energy consumption per ton is reduced by 35-70%, the COD (Chemical Oxygen Demand) and the ammonium-nitrogen removal rate of the system reach 92.0-98.0%, and the effluent quality accords with a first level standard A in Pollutant Discharge Standard of Municipal Wastewater Treatment Plant of China (GB18918-2002) and Urban Miscellaneous Water Quality Standard of Urban Wastewater Reclamation and Reuse of China (GB/T18920-2002). The method provided by the invention is scientific and reasonable in technology, and has important meaning for recycle of municipal wastewater.

Description

A kind of method of less energy-consumption recycling municipal sewage
Technical field
A method for less energy-consumption recycling municipal sewage, belongs to waste water reclaiming technical field.
Background technology
In recent years, as the advantage combination of waste water physics and biologic treating technique, so that excess sludge production is low, is good at, with sewage recycling (or reuse) and harmless membrane bioreactor (Membrane Bioreactor, the MBR) technology that turns to ultimate aim, at sewage treatment area, is widely used with efficient denitrification.According to statistics, China puts into operation or has exceeded 300 in the MBR sewage treatment project of building, wherein, and nearly 10 covers of ton MBR system.But practice at home and abroad shows, it is the major obstacle of restriction MBR steady running all the time that running cost and film pollute.With regard to its running cost, traditional municipal wastewater treatment plant average current drain is 0.3kWh/m 3sewage, but the energy consumption that MBR disposes of sewage is up to 0.5~1.0kWh/m 3sewage.On the other hand, no matter adopt which kind of film pollution prevention measure, once film contacts with mud mixed liquid, film pollutes and starts.Therefore the sewage water treatment method that, find less energy-consumption, effectively solves MBR membrane pollution problem is very necessary.
Microbiological fuel cell (Microbial Fuel Cell, MFC) be one by organism in anode electrogenesis microbial film degradation of sewage and produce the new technology of sustainable electric energy.As all fuel cells, MFC generating is not that fuel (organism in waste water or waste) is burnt, but under anaerobic from fuel molecule, strip electronics (being the electronics that Microorganism respiration produces), and be delivered to oxygen by predetermined approach (electrode and external circuit), by the Conversion of energy that is originally used for oxidative phosphorylation biosynthesizing ATP, it is electricity, wherein microorganism is the catalyzer of biochemical reaction, and the electricity generation process of MFC realizes by the oxidation of anode organism (electron donor) and the reduction of negative electrode oxygen (electron acceptor(EA)).But, as one of Anaerobic Microbiological Treatment Technology, MFC is difficult to obtain good effluent quality, be combined with techniques such as nitrifying process, sequencing batch reactor, blodisc, bio-contact oxidations, even MFC is placed in to the aeration tank of activated sludge process, can improve MFC effluent quality, but said process all cannot effectively be removed the suspended substance in system water outlet, is difficult to reuse.
The present invention is take municipal wastewater as handling object, the MBR (aerobe technology) that has proposed coupling MFC (anaerobe technology) processes municipal wastewater new technology, this technology has following advantage: 1. in sewage, the organism such as most of glucose, in anaerobic unit (being MFC anolyte compartment), oxidizing reaction (reaction formula 1) occurs, the electronics producing is delivered to MFC negative electrode via MFC anode and external circuit, and the electric energy of recovery can be used for compensating the high running cost of MBR.2. the proton that MFC anodic oxidation produces sees through the thick carbon felt of 0.5~1.0cm and arrives MBR aerobic unit, generates water (reaction formula 2) with electronics and combination with oxygen, has eliminated the easy acidifying of common MFC anode, feedback inhibition electrogenesis microorganism active problem.3. the residual organic substances after MFC anodic oxidation also sees through the thick carbon felt of 0.5~1.0cm with current and arrives MBR aerobic unit, and further aerobic mineralising is removed (reaction formula 3), and MBR film filtration effluent water quality is good.4. with the prolongation of working time, the surface of the thick carbon felt of 0.5~1.0cm forms microbial film, system denitrification effect good (reaction formula 4-7).5. the membrane module in MBR, simultaneously as MFC negative electrode (also claiming conduction microfiltration membrane), can be between MBR film surface and film surface pollution thing electrostatic repulsion is provided, and effectively alleviates film and pollutes.6. coupled system is simple in structure, and convenient operation and management adopts the thick carbon felt of 0.5~1.0cm to substitute the proton exchange membrane in common MFC simultaneously, greatly reduces system constructing cost.
C 6H 12O 6+6H 2O→6CO 2+24H ++24e - (1)
4H ++O 2+4e -→2H 2O (2)
C 6H 12O 6+6O 2→6CO 2+6H 2O(3)
NH 4 ++1.5O 2→NO 2 -+2H ++H 2O (4)
NO 2 -+1.5O 2→NO 3 - (5)
NO 2 -+3H +→0.5N 2+H 2O+OH - (6)
NO 3 -+5H +→0.5N 2+H 2O+OH - (7)
Summary of the invention
The object of the invention is to invent the method for the recycling municipal sewage that a kind of energy consumption is low, effluent quality is good.
Technical matters of the present invention comprises following step:
1, water inlet: municipal wastewater, inlet COD concentration is 100~500mg/L, and influent ammonium concentration is 10~50mg/L, and pH value is 6~9;
2, anaerobic unit: first municipal wastewater squeezes into anaerobic unit by intake pump, be that MFC anolyte compartment carries out anaerobic treatment, hydraulic detention time (Hydraulic Residence Time, HRT) be 10~24h, temperature is 15~35 ℃, and anode material is carbon felt, carbon cloth, graphite and modifying and decorating material thereof;
3, aerobic unit: anaerobic unit water outlet after treatment sees through the thick carbon felt of 0.5~1.0cm and flow to MBR aerobic unit, it is MFC cathode compartment, HRT is 6~12h, temperature is 15~35 ℃, dissolved oxygen concentration is 2.0~6.0mg/L, the MBR membrane module MFC negative electrode of holding concurrently, material is conducting polymer modified stainless (steel) wire, non-woven fabrics, carbon felt, carbon cloth;
4, adopting the thick carbon felt of 0.5~1.0cm is two unit of anaerobic and aerobic by System Partition, and device construction cost is low.
Advantage of the present invention
1, in sewage, the organism such as most of glucose is in the MFC of anaerobic unit anode generation oxidizing reaction, and the electronics of generation is delivered to the MFC negative electrode of aerobic unit via MFC anode and external circuit, by extrernal resistance, reclaims its electric energy and for compensating MBR running cost;
2, the proton that MFC anodic oxidation produces sees through the thick carbon felt of 0.5~1.0cm with current and arrives MBR aerobic unit (being NFC cathode compartment), generate water with electronics and combination with oxygen, eliminated the problem of the easy acidifying of common MFC anode, feedback inhibition electrogenesis microorganism active;
3, the residual organic substances after MFC anodic oxidation also sees through the thick carbon felt of 0.5~1.0cm with current and arrives MBR aerobic unit, and further aerobic mineralising is removed;
4, with the prolongation of working time, the surface of the thick carbon felt of 0.5~1.0cm forms microbial film, and system denitrification effect is good;
5, the membrane module in MBR, simultaneously as MFC negative electrode (also claiming conduction microfiltration membrane), can be between MBR film surface and film surface pollution thing electrostatic repulsion is provided, and effectively alleviates film and pollutes;
6, compared with traditional MBR system, ton sewage disposal Energy Intensity Reduction 30%~70%, COD and the ammonia nitrogen removal frank of system are 90.0%~98.0%, and effluent quality meets one-level A standard and China's urban sewage reutilization city miscellaneous water water quality standard (GB/T18920-2002) in China's urban wastewater treatment firm pollutant emission standard (GB18918-2002);
7, coupled system is simple in structure, and convenient operation and management adopts the thick carbon felt of 0.5~1.0cm to substitute the proton exchange membrane in common MFC simultaneously, greatly reduces system constructing cost.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Embodiment 1:MFC anode adopts carbon felt, and MBR membrane module adopts Graphene+polyvinylidene difluoride (PVDF) to modify non-woven fabrics.System influent quality is as follows: COD concentration is 500mg/L, ammonia nitrogen 40mg/L, and pH value is 7; The HRT of anaerobic unit is 16h; The HRT of aerobic unit is 8h, and dissolved oxygen concentration is 4.0mg/L; Temperature is 25 ℃.
Embodiment 2:MFC anode adopts carbon cloth, and MBR membrane module adopts Polyaniline-modified stainless (steel) wire.System influent quality is as follows: COD concentration is 300mg/L, ammonia nitrogen 20mg/L, and pH value is 8; The HRT of anaerobic unit is 10h; The HRT of aerobic unit is 6h, and dissolved oxygen concentration is 2.0mg/L; Temperature is 30 ℃.
Embodiment 3:MFC anode adopts graphite, and MBR membrane module adopts graphene modified carbon cloth.System influent quality is as follows: COD concentration is 100mg/L, ammonia nitrogen 10mg/L, and pH value is 9; The HRT of anaerobic unit is 10h; The HRT of aerobic unit is 6h, and dissolved oxygen concentration is 6.0mg/L; Temperature is 20 ℃.

Claims (6)

1. a method for less energy-consumption recycling municipal sewage, is characterized in that:
(1) water inlet: municipal wastewater, COD concentration is 100~500mg/L, and ammonia nitrogen concentration is 10~50mg/L, and pH value is 6~9;
(2) anaerobic unit: first sanitary sewage squeezes into microbiological fuel cell (Microbial Fuel Cell by intake pump, MFC) anolyte compartment carries out anaerobic treatment, hydraulic detention time (Hydraulic Residence Time, HRT) be 10~24h, temperature is 15~35 ℃, and anode material is carbon felt, carbon cloth, graphite and modifying and decorating material thereof;
(3) aerobic unit: anaerobic unit water outlet after treatment sees through the thick carbon felt of 0.5~1.0cm and enters membrane bioreactor (Membrane Bioreactor, MBR) aerobic unit carries out aerobic treatment, HRT is 6~12h, temperature is 15~35 ℃, dissolved oxygen concentration is 2.0~6.0mg/L, the MBR membrane module MFC negative electrode of holding concurrently, material is conducting polymer modified stainless (steel) wire, non-woven fabrics, carbon felt, carbon cloth;
(4) adopting the thick carbon felt of 0.5~1.0cm is MFC and two unit of MBR by System Partition, and device construction cost is low;
(5) drainage cell: discharge reuse through MBR water outlet, wet-pit and pipeline through aerobic unit sewage after treatment.
2. the method for a kind of less energy-consumption recycling municipal sewage according to claim 1, it is characterized in that: the proton that organism produces in MFC anodic oxidation sees through the thick carbon felt of 0.5~1.0cm and arrives MBR aerobic unit (being MFC cathode compartment), generate water with electronics and combination with oxygen, eliminated the problem of the easy acidifying of common MFC anode, feedback inhibition electrogenesis microorganism active.
3. the method for a kind of less energy-consumption recycling municipal sewage according to claim 1, is characterized in that: the residual organic substances after MFC anodic oxidation also sees through the thick carbon felt of 0.5~1.0cm with current and arrives MBR aerobic unit, and further aerobic mineralising is removed.
4. the method for a kind of less energy-consumption recycling municipal sewage according to claim 1, is characterized in that: with the prolongation of working time, the surface of the thick carbon felt of 0.5~1.0cm forms microbial film, and system denitrification effect is good.
5. the method for a kind of less energy-consumption recycling municipal sewage according to claim 1, it is characterized in that: the membrane module in MBR is simultaneously as MFC negative electrode (also claiming conduction microfiltration membrane), can be between MBR film surface and film surface pollution thing electrostatic repulsion is provided, effectively alleviate film and pollute.
6. the method for a kind of less energy-consumption recycling municipal sewage according to claim 1, is characterized in that: adopt the thick carbon felt of 0.5~1.0cm to substitute the proton exchange membrane in common MFC, greatly reduce system constructing cost.
CN201310732549.5A 2013-12-26 2013-12-26 Low-energy-consumption municipal wastewater recycling method Pending CN103739070A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104628134A (en) * 2015-02-04 2015-05-20 浙江大学 Up-flow electrochemical biofilm reactor
CN107195940A (en) * 2017-06-20 2017-09-22 江南大学 The method of one kind reinforcing non-buffered microbiological fuel cell (BLMFC) electricity generation performance
CN108264195A (en) * 2018-01-25 2018-07-10 浙江嘉善市政园林有限公司 A kind of municipal drainage system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103043872A (en) * 2013-01-23 2013-04-17 哈尔滨工业大学 Sewage treatment device combining microbial fuel cell and dynamic membrane

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103043872A (en) * 2013-01-23 2013-04-17 哈尔滨工业大学 Sewage treatment device combining microbial fuel cell and dynamic membrane

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104628134A (en) * 2015-02-04 2015-05-20 浙江大学 Up-flow electrochemical biofilm reactor
CN107195940A (en) * 2017-06-20 2017-09-22 江南大学 The method of one kind reinforcing non-buffered microbiological fuel cell (BLMFC) electricity generation performance
CN108264195A (en) * 2018-01-25 2018-07-10 浙江嘉善市政园林有限公司 A kind of municipal drainage system

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Application publication date: 20140423