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Method of reducing salinity accumulation in forward osmosis membrane-bioreactor

A bioreactor and forward osmosis membrane technology, applied in chemical instruments and methods, sustainable biological treatment, biological water/sewage treatment, etc., to achieve no change in sludge retention time, shorten hydraulic retention time, and reduce the accumulation of salinity Effect

Inactive Publication Date: 2013-12-18
JIANGNAN UNIV
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Problems solved by technology

[0004] Aiming at the above-mentioned problem of salinity accumulation in the existing OMBR, the present invention provides a low investment, low operating cost, convenient operation and management, in line with engineering popularization and application, through the extraction of soluble salts by microfiltration membranes to reduce the concentration of OMBR. Methods of Salinity Accumulation

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[0014] In the OMBR, a flat FO membrane is used as the FO membrane module 6 , and a flat microfiltration membrane is used as the microfiltration membrane module 5 . The FO membrane module 6 is made of cellulose acetate, and the flat microfiltration membrane module 5 is made of polyvinylidene fluoride (PVDF), with a pore diameter of about 0.2 μm. In addition, the drawing solution is 1M sodium chloride solution, and the effective membrane area of ​​FO membrane module 6 is 0.056m 2 , the initial flux is 7.5L / (m 2 h); the effective membrane area of ​​flat microfiltration membrane module 5 is 0.060m 2 , set the operating flux to 5L / (m 2 h). The aeration rate of OMBR is 0.3m 3 / h, the sludge residence time is 10d, and the suspension concentration of the mixed liquor is about 4g / L. And compared with the conventional OMBR using a flat FO membrane to treat domestic sewage, the conductivity in the reactor (conductivity can characterize the salinity in the reactor) and the FO membran...

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Abstract

The invention belongs to the field of water and waste water treatment and especially relates to a method of reducing salinity accumulation in forward osmosis membrane-bioreactor by extracting soluble salts via a micro-filtration membrane. The method is realized by placing the micro-filtration membrane with a single water outlet system and a conductivity controller into a reactor, and implementing in-site extraction of soluble salts in the reactor by controlling the water yield of the micro-filtration membrane so as to maintain the salinity in the forward osmosis membrane-bioreactor stable and improve the running flux of the forward osmosis membrane-bioreactor. The method is realized without need of structural improvement on the former forward osmosis membrane-bioreactor but addition of the micro-filtration membrane; the method is wide in the application scope and can be applied to the forward osmosis membrane-bioreactor for treating the waste water and also micro-polluted water, and is convenient for operation and management and easy for promotion and application.

Description

technical field [0001] The invention relates to a method for reducing salinity accumulation in a forward osmosis membrane-bioreactor by extracting salt by means of a microfiltration membrane, and belongs to the field of water and waste water treatment. Background technique [0002] Forward osmosis membrane-bioreactor (OMBR for short) is a new type of membrane-bioreactor technology. new technology. In the FO process, the draw liquid is placed on the water-producing side of the membrane, and the osmotic pressure difference on both sides of the membrane is used as the driving force to make water flow from the raw material liquid to the water-producing side without additional energy consumption. Compared with traditional membrane-bioreactors, OMBR uses FO membranes with nano-scale pore size instead of microfiltration membranes or ultrafiltration membranes, which improves the interception of suspended particles, inorganic ions, organic pollutants and microorganisms, and better e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 王新华陈瑶李秀芬袁博任月萍
Owner JIANGNAN UNIV
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