On-line chemical cleaning method for membrane bioreactor

Abstract

The present invention belongs to the field of water and waste water treating and purifying technology, and is one kind of on-line chemical cleaning method for controlling the membrane contamination of membrane bioreactor. The chemical cleaning method has alkali washing as the main part and acid washing as the auxiliary part, and for membrane bioreactors of different sizes, two different cleaning modes are recommended. The method can eliminate membrane pore jamming caused by macro molecular organic matter and colloid matter and gel contamination effectively to restore the filtering capacity of the membrane, and has simple operation and low maintenance cost. Applying the method can realize the long term stable operation of the membrane assembly, prolong the service life of membrane assembly and lower the maintenance cost of membrane assembly.

Description

technical field [0001] The invention belongs to the technical field of water and waste water treatment and purification, in particular to an online chemical cleaning method for membrane-bioreactors for controlling membrane pollution in membrane-bioreactors. Background technique [0002] Membrane-bioreactor is a new type of efficient sewage treatment and reuse technology that organically combines membrane separation technology with traditional biological treatment technology. Compared with the traditional wastewater treatment process, the membrane-bioreactor technology has outstanding advantages such as excellent and stable effluent quality, small footprint, and less residual sludge production due to the use of efficient membrane separation technology to replace the gravity sedimentation separation method, and The membrane-bioreactor device has a compact structure and is easy to realize automatic control. At the same time, it can also conveniently transform the traditional ur...

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Problems solved by technology

[0006] Although there are several patent documents on the application of membrane-bioreactors for sewage treatment at home and abroad, such as the domestic "suction built-in membrane-bioreactor (patent No. 97228698.5)", "through-flow membrane-bioreactor Water treatment process and its equipment (patent No. 99111514.7), "integrated membrane bioreaction equipment" (patent No. 98225338.9), "hollow fiber membrane bioreaction sewage processor" (patent No. 97228032.4), "membrane separation sewage Device" (Patent No. 00250653.X), "Membrane Bioreactor for Wastewater Treatment" (Patent No. 01212672.1), and foreign "Membrane bioreactor, process andaerator" (Pub.No.: US 2004 / 0108268 A1), " Apparatus and method forcleaning membrane filtration modules” (Pub.No.: WO 00 / 18498), “Chemicalcleaning backwash for immersed filtering membranes” (Pub.No.: WO01 / 08790 A1), “Filter device” (Pub.No.: JP 2001079362 A), "Separating membrane module and module assembly" (Pub.No.: JP 2003181248 A), "Method and apparatus for chemical cleaning of filter membrane module" (Pub.No.: JP 2003251159 A), but none of these patents Involves in-line chemical cleaning or is only mentioned in general without more detailed and clear operational parameters

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