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Forward osmosis membrane bioreactor

A technology of bioreactor and forward osmosis membrane, which is applied in the field of membrane separation, can solve problems such as increased investment and operating costs, hindering the promotion of MBR technology, and ineffective practical effects, so as to overcome organic pollution, shorten biochemical reaction time, and strengthen biochemical The effect of the reaction effect

Inactive Publication Date: 2011-11-23
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of energy consumption, in addition to the power operation cost of MBR, membrane fouling is the main reason for the high energy consumption of MBR.
Membrane fouling causes rapid attenuation of permeable flux, frequent off-line cleaning, shortened membrane life, and increased investment and operating costs
In the actual operation of MBR, methods such as adding chemicals, reducing sludge concentration, stabilizing influent flow rate, and increasing aeration are often used to reduce membrane fouling, but the actual effect is not obvious
These defects and problems of the existing MBR limit the application of MBR and hinder the promotion of MBR technology

Method used

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  • Forward osmosis membrane bioreactor
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Activated sludge is put into the forward osmosis membrane bioreactor 5 of the present invention and domesticated, and will contain COD be 40g / L, BOD5 be 0.3g / L, NH 4 - Sewage with N of 0.2g / L and SS of 0.2g / L is put into the membrane bioreactor 5; connected to the forward osmosis system, the hollow fiber cellulose acetate membrane 10 module is used as the forward osmosis membrane module 8, soaked in the membrane bioreactor In the sewage in the reactor 5, the sodium chloride solution of 20g / L is used as the drive solution, and injected into the drive solution storage tank 1; the brine concentration system is connected, and the concentration system used is a conventional reverse osmosis system; the forward osmosis control system is in Operate at a temperature of 12°C and a pH of 6.5. The forward osmosis MBR system operates stably, and the treatment effect is good. The COD and BOD of the effluent are 0, and the NH 4 -N was not detected, SS was not detected, and the quality...

Embodiment 2

[0030] The activated sludge is put into the membrane bioreactor 5 for acclimation, and will contain COD as 70g / L, BOD5 as 10g / L, NH 4 - Sewage with N of 0.5g / L and SS of 5g / L is put into the membrane bioreactor 5; connected to the forward osmosis system, the roll-type polyamide composite membrane 10 module is used as the forward osmosis membrane module 8, soaked in the membrane bioreactor In the sewage in the device 5, 40g / L magnesium chloride solution is used as the drive solution, and injected into the drive solution storage tank 1; the brine concentration system is connected, and the concentration system used is a conventional nanofiltration system; the forward osmosis control system operates at a temperature of 20°C , run at pH 7.0. The forward osmosis MBR system operates stably and the treatment effect is good. The COD of the effluent quality varies from 0 to 5mg / L, the BOD varies from 0 to 1mg / L, and the NH 4 -N was not detected, SS was not detected, and the quality of ...

Embodiment 3

[0032] Put the activated sludge into the membrane bioreactor 5 for acclimation, and will contain COD as 100g / L, BOD5 as 50g / L, NH 4 - Sewage with N of 1.0g / L and SS of 10g / L is put into the membrane bioreactor 5; connected to the forward osmosis system, the hollow fiber polybenzimidazole membrane 10 module is used as the forward osmosis membrane module 8 to soak in the membrane bioreactor In the sewage in the device 5, the mixed solution of 60g / L sodium chloride and 1g / L sucrose is used as the driving liquid, and injected into the driving liquid storage tank 1; the brine concentration system is connected, and the concentration system used is a conventional nanofiltration system ; The forward osmosis control system operates at a temperature of 20°C and a pH of 8.0. The forward osmosis MBR system operates stably and the treatment effect is good. The COD of the effluent quality varies from 0 to 3mg / L, the BOD varies from 0 to 1mg / L, and the NH 4 -N was not detected, SS was not d...

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Abstract

The invention discloses a forward osmosis membrane bioreactor which comprises a bioreactor system, a forward osmosis membrane separation system and a brine concentration system; the forward osmosis membrane separation system comprises a driving liquid storage tank, a water inlet pump, a water inlet valve, an MBR water inlet flow meter, a forward osmosis membrane component and a driving liquid recovery tank sequentially connected through pipes, the forward osmosis membrane component is cast by a water inlet collecting pipe, a forward osmosis membrane and a produced water collecting pipe, the MBR water inlet flow meter is connected with the water inlet collecting pipe through a pipe, and the produced water collecting pipe is connected with the driving liquid recovery tank through a pipe; the brine concentration system comprises a concentration pump connected with the driving liquid recovery tank through a pipe, the concentration pump is sequentially connected with a concentrate inlet valve, a concentrate inlet flow meter and a concentration membrane component through pipes, wherein one path of the concentration membrane component is connected with a fresh water storage tank through a pipe, and the other path is connected with the driving liquid storage tank through a pipe; the forward osmosis membrane is a semi-permeable membrane with salt cut-off effect; the driving liquid refers to high chemical potential inorganic brine solution and includes high-concentration inorganic brine solution or the mixed solution of inorganic salt and other water-soluble organic matters.

Description

technical field [0001] The invention relates to a membrane separation technology, in particular to a forward osmosis membrane bioreactor. Background technique [0002] The treatment and reuse of urban sewage, domestic wastewater and industrial wastewater can not only solve the pollution problem, but also make the sewage be used effectively and alleviate the tension of water resource shortage. It is a measure that kills two birds with one stone, and has obvious economic, social and environmental benefits. . Membrane Bioreactor (MBR for short) is a water treatment technology that integrates high-efficiency membrane separation technology and biodegradation of bioreactors. It uses membrane modules to replace the sedimentation tank in the traditional activated sludge method to achieve mud-water separation. , has the characteristics of high solid-liquid separation rate, complete interception of microorganisms, good effluent quality, high treatment efficiency, small footprint, sim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 王薇杜启云
Owner TIANJIN POLYTECHNIC UNIV
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