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Immersion type double membrane bioreactor and salt-containing sewage treatment method

A technology of membrane bioreactor and biological reaction tank, which is applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of reducing osmotic power and drainage flux, and reducing organic matter treatment Efficiency, OMBR difficulty in long-term continuous operation, etc., to achieve the effect of reducing membrane clogging, convenient membrane cleaning and maintenance, and eliminating reverse osmosis membrane clogging

Active Publication Date: 2013-05-15
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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Problems solved by technology

[0006] However, it is difficult for OMBR to operate continuously for a long period of time. The FO membrane will intercept the salt in the wastewater, so that the salt in the biological reaction tank will continue to accumulate and the concentration will become higher and higher. The amount of salt gradually decreases, and the high concentration of salt accumulated in the bioreactor will also inhibit microbial activities and reduce the treatment efficiency of organic matter

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  • Immersion type double membrane bioreactor and salt-containing sewage treatment method

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Embodiment 1

[0020] A double-membrane bioreactor small-scale test device is designed by using the present invention. The OMBR module and the MBR module are immersed in a 20 L bioreactor, both of which are of cross-flow type. The OMBR membrane is a 0.1 m×0.5 m triacetate cellulose forward osmosis membrane (provided by Hydration Technologies), the draw solution is 1.0 mol / L sodium chloride solution, the circulation flow rate is 3.0 L / min, and the membrane permeation flow rate is 3-7 L / m 2 / h. The MBR membrane is a 0.1 m×0.5 m flat ultrafiltration membrane (provided by Kubota, PES material, pore size 0.4 μm), and the membrane filtration flow rate is 7-25 L / m 2 / h. The air velocity at the bottom of the water inlet side of the membrane module is 0.1 m / s. The sludge concentration in the bioreactor is 5000-8000 mg / L, the hydraulic retention time is 6 h, and the sludge retention time is 15 days. The main indicators of the influent and treated effluent are shown in Table 1 under the optimized ...

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Abstract

The present invention discloses an immersion type double membrane bioreactor and a salt-containing sewage treatment method. The immersion type double membrane bioreactor mainly comprises a biological reaction tank, a microfiltration or ultrafiltration membrane assembly, a positive osmosis membrane assembly, a positive osmosis absorption liquid unit and an absorption liquid reverse osmosis concentration system. The immersion type double membrane bioreactor and the salt-containing sewage treatment method are applicable for deep purification and reuse treatments of various municipal and industrial wastewater, wherein water quality of the treated effluent is similar to water quality of reverse osmosis effluent.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a submerged double-membrane bioreactor and a method for treating salty sewage. Background technique [0002] Membrane bioreactor (MBR) is mainly composed of microfiltration (MF) membrane, ultrafiltration (UF) membrane or nanofiltration (NF) membrane module and bioreaction tank in an integrated or separate manner. The integrated MBR is also called submerged MBR is widely used. After the wastewater enters the submerged MBR, the organic matter in it is degraded by microorganisms (mainly in an aerobic way), and the membrane module is pumped by the water pump to form a transmembrane pressure difference, so that the treated effluent is percolated and discharged. MBR has been widely used in various types of urban and industrial wastewater treatment, its sludge concentration is much higher than the traditional activated sludge method, the treatment efficiency is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 李凌波
Owner CHINA PETROLEUM & CHEM CORP
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