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Sewage treatment unit and method using bioelectrochemistry to aid membrane bioreactor

The technology of a sewage treatment device and a bioreactor is applied in the field of bioelectrochemical auxiliary membrane bioreactor sewage treatment device, which can solve the problems of pollution, high operation cost, expensive membrane material, etc. The effect of reducing investment costs

Inactive Publication Date: 2014-01-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MBR is not ideal in the process of actual promotion and application
The reason is mainly the following three problems: (1) The energy consumption of the operation is relatively high. At present, the energy consumption of the aerobic MBR operation is higher than that of the traditional activated sludge method, resulting in higher operating costs; (2) The membrane material is relatively expensive. Membrane separation components used in actual projects are more expensive, resulting in higher investment in MBR process; (3) Membrane pollution problem, membrane pollution control is not easy in current projects, resulting in a decline in membrane performance
On this basis, the high energy consumption of operation is a more prominent problem

Method used

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  • Sewage treatment unit and method using bioelectrochemistry to aid membrane bioreactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: as figure 1 and figure 2As shown, the upflow electrochemical membrane bioreactor is composed of an anode chamber 1 , a cathode chamber 2 , a separation membrane 3 , a connecting pipe 4 , an external circuit 10 , an inlet pipe 11 and an outlet pipe 12 . The anode chamber 1 further comprises a graphite material filler 5 and an anode carbon rod 6, etc., the graphite material filler 5 is any one of graphite brush, graphite particles, graphite felt or other forms, and the cathode chamber 2 includes a membrane separation assembly 7, a cathode Carbon rod 8 and aeration tube 9, the aeration is provided by the aeration device, and the aeration tube 9 is located directly below the membrane separation module 7, which is convenient for scouring the membrane surface to reduce membrane pollution. The anode chamber 1, the cathode chamber 2 and the separation film 3 constitute the inner circuit of the MFC, which are connected with the external circuit 10 to form the who...

Embodiment 2

[0032] Using the device and method described in Example 1 to treat rural domestic sewage, the influent COD concentration is 307.6±15.7 mg / L, the ammonia nitrogen concentration is 24.2±2.4 mg / L; the hydraulic retention time of the anode chamber is 17 min, and the hydraulic retention time of the cathode chamber is 6.1 h. The membrane flux is 30 L / (m 2 h). The average removal rate of COD is 90.3%±1.8, the average removal rate of ammonia nitrogen is 98.5%±0.8, the turbidity of the effluent is less than 1NTU, the membrane cleaning cycle is maintained at more than 30d, and the maximum power density is 10.9 W / m 3 .

Embodiment 3

[0034] Using the device and method described in Example 1 to treat typical urban domestic sewage, the influent COD concentration is 644.2±21.5 mg / L, the ammonia nitrogen concentration is 35.2±2.6 mg / L; the hydraulic retention time of the anode chamber is 35 min, and the hydraulic retention time of the cathode chamber is 11.5 h , the membrane flux is 25 L / (m 2 h). The average removal rate of COD is 91.2%±1.6, the average removal rate of ammonia nitrogen is 99.1%±1.2, the turbidity of the effluent is less than 1NTU, the membrane cleaning cycle is maintained at more than 30d, and the maximum power density is 14.9 W / m 3 .

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Abstract

The invention relates to a sewage treatment unit and method using bioelectrochemistry to aid membrane bioreactor. Graphite filler is used as an anode which is connected with an external circuit through a graphite bar. A membrane separating component in a cathode chamber serves as an MBR membrane separating component and an MFC cathode. A conductive graphite bar which is connected with the external circuit is embedded on the membrane separating component. The cathode chamber and a anode chamber are separated through a separating membrane, so that dissolved oxygen is effectively prevented from diffusing to the anode chamber, and proton free diffusion is allowed. When organic sewage enters from the anode chamber, the anode chamber is oxidized by electrogenesis microorganisms to generate electron and proton under anaerobic conditions, the electron is transmitted to the graphite filler electrode through the microorganisms and then to the cathode through the circuit, and the proton passes the separating membrane to enter the cathode chamber under potential difference and diffusion effects of the cathode chamber and the anode chamber and reacts with oxygen and electron transmitted by the external circuit to generate water and form an internal circuit. The sewage entering the cathode chamber through a communication pipe is pumped and discharged through the membrane separating component.

Description

technical field [0001] The invention relates to a bioelectrochemical auxiliary membrane bioreactor sewage treatment device and method, belonging to the technical field of sewage (waste) water treatment. Background technique [0002] Membrane bioreactor (Membrane Bioreactor, hereinafter referred to as MBR) is a new and efficient water treatment technology. The membrane separation module is directly submerged in the reactor, and the water is pumped out by the pump. Due to the high-efficiency separation performance of the membrane, compared with the traditional activated sludge sewage treatment process, it has the advantages of small footprint, high volume load, and good effluent quality. It is considered to be one of the promising sewage treatment and reuse technologies. one. However, MBR is not ideal in the actual popularization and application process. The reason is mainly the following three problems: (1) The energy consumption of the operation is relatively high. At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30H01M8/16
CPCY02E60/527Y02E60/50
Inventor 王志伟黄健唐霁旭黄菲张星冉张杰马金星吴志超
Owner TONGJI UNIV
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