NF/RO microbial pollution control and cleaning comprehensive evaluation method

Abstract

The invention discloses an NF / RO microbial pollution control and cleaning comprehensive evaluation method. According to the method, NF / RO membrane microbial pollution is enhanced according to different inflow water qualities, the membrane subjected to enhanced pollution is cleaned by using different bactericides and adopting different sterilization modes, and a membrane filtration test is conducted by using NF / RO inflow water. The cleaning effect of the bactericide is evaluated according to the membrane filtration performance recovery condition, meanwhile, the sterilized membrane is subjected to secondary inoculation to a sterile culture dish, and the sterilization mode and the sterilization effect of the bactericide are evaluated according to the growth of a bacterial colony of a culture medium and the bacterium breeding condition. According to the invention, through two dimensions of membrane filtration performance recovery and sterilization effect, multiple microbial pollution control and cleaning modes are systematically evaluated, a bactericide screening test is carried out by adopting an ectopic small test mode, the evaluation method is rapid and accurate, and no adverse effect on an NF / RO system exists.

Description

Technical field [0001] The present invention relates to a membrane separation system, and more particularly to a method of evaluating and cleaning a microbial contamination for membrane separation systems. Background technique [0002] After decades of research and development, NF / RO membrane separation systems have been widely used worldwide. According to statistics, NF / RO membrane systems have been put into more than 10,000 sets of water treatment in our country, with pure water preparation, sewage treatment, seawater and other fields, and application industries involve municipal, chemical, pharmaceutical, food industry, etc. . [0003] The most important problem encountered in the application is the problem of membrane pollution, including: microbial pollution, chemical pollution, particles and colloidal pollution. Microbial pollution is the main reason for the operation of NF / RO water treatment system due to rapid development of pollution, difficult to clean. Membrane m...

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Problems solved by technology

[0008] At present, no comprehensive evaluation method for NF / RO microbial contamination control and cleaning has been found from relevant technical materials, especially the method for systematic evaluation and screening of microbial control and cleaning methods for NF / RO systems with different influent water quality

CN103157381A A kind of determination method and application of microbial contamination of reverse osmosis membrane discloses a principle of using plate counting, adopts Petrifilm disc method to detect the microbial load of reverse osmosis membrane system influent, product water and concentrated water, to determine reverse osmosis membrane However, this method does not directly reflect the bactericidal effect on microbial contamination on NF / RO membranes and the recovery of membrane flux.

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