A kind of cleaning method of bacterial sludge on the inner wall of the inlet pipe of nf/ro membrane unit

Abstract

The invention discloses a cleaning method for bacterial sludge breeding on the inner wall of the water inlet pipe of an NF / RO membrane unit, comprising the following steps: emptying the residual sewage in the water inlet pipe, cleaning the inner wall of the water inlet pipe with water, until the water quality of the eluate is The chromaticity is less than 10 times; the inner wall of the water inlet pipe and the NF / RO membrane unit are circularly cleaned with sodium bisulfite solution, so that the NF / RO membrane elements are soaked in the sodium bisulfite solution; the inner wall of the water inlet pipe is cleaned with cleaning agents Carry out soaking; wash the inner wall of the water inlet pipe with water; use neutralizing agents to circularly clean the inner wall of the water inlet pipe, and complete the cleaning of the bacterial sludge on the inner wall of the water inlet pipe of the NF / RO membrane unit. The cleaning method of the present invention can effectively remove the bacterial sludge grown on the inner wall of the water inlet pipe, has the advantages of simple process, easy operation, low treatment cost, high cleaning efficiency, good cleaning effect, etc., can meet the actual treatment needs, and has good advantages Application value and application prospect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a cleaning method for bacterial sludge growing on the inner wall of an NF / RO membrane unit inlet pipe. Background technique [0002] At present, the treatment method of landfill leachate often adopts MBR+NF / RO process, in which ultrafiltration membrane elements are an important part, and the service life of ultrafiltration membrane elements is generally 3 to 5 years. When the service life of ultrafiltration membrane elements is close to or exceeds 3 to 5 years, the interception performance of microorganisms will decrease. In particular, in the actual application process, in order to improve the utilization efficiency of equipment and reduce production and operation costs, usually only a small number of ultrafiltration membrane elements with low flux are replaced, while most of the ultrafiltration membrane elements that have exceeded their service life will still be damaged...

AI Technical Summary

Problems solved by technology

[0003] At present, the main methods for cleaning the bacterial sludge on the inner wall of the inlet pipe of the NF / RO membrane unit are: (1) manual mechanical removal method, which requires the removal of the pipe, and then mechanical descaling by manual beating, but there are the following problems: Long construction period, many construction personnel, high strength, low efficiency, and poor cleaning effect have a great impact on production and seriously affect production efficiency

(2) Chemical agent cleaning method. This method manually injects chemical agent that reacts with sludge into the pipeline at the highest point of the pipeline. The chemical agent reacts with the sludge on the inner wall of the pipeline or dissolves the sludge, thereby achieving sludge removal. However, there are still problems such as poor cleaning effect and long cleaning time in the existing chemical cleaning method

In addition, if cleaning is carried out by manually pouring chemicals, there are still the following problems: the air in the pipeline and the gas generated by the reaction are not easy to discharge, resulting in poor pouring of the cleaning chemicals, and the poured cleaning chemicals are easy to splash out , there are great personal safety hazards, the cleaning chemicals and the pipeline cannot be fully contacted, and the cleaning efficiency and cleaning effect are poor

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