Sterilization method capable of preventing reverse osmosis membrane from being polluted and plugged by microbe

A technology of reverse osmosis membrane and microorganisms, which is applied in the fields of semipermeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc. It can solve problems affecting the performance of reverse osmosis devices, mechanical damage of membrane elements, and decline in water production. , to achieve the effects of controlling breeding and over-breeding, eliminating pressure rise factors, and saving cleaning costs

CN104014247AActive Publication Date: 2014-09-03INNER MONGOLIA YITAI CTO
3 Cites 15 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-09-03

Smart Images

  • Figure 1
    Figure 1
Patent Text Reader

Abstract

The invention relates to a sterilization method capable of preventing a reverse osmosis membrane from being polluted and plugged by microbe. The sterilization method mainly comprises the steps of adding an oxidizing sterilizing agent NaClO (5%) solution to a raw water tank continuously; adding a reducing agent NaHSO3 (35% W / V) solution continuously after ultra-filtration; removing residual chlorine thoroughly; controlling a pH value of inlet water at a reverse osmosis inlet between 7.1 and 7.4; monitoring and controlling ORP before a security filter between 200 mv and 300 mv; and sterilizing by carrying out preventative addition of a non-oxidizing sterilizing agent DBNPA solution with a concentration of 50 ppm continuously for one hour once every week in the above flow according to the quick killing characteristic of the non-oxidizing sterilizing agent DBNPA. Meanwhile, NaClO addition to the raw water tank is stopped. The sterilization method mainly takes use of the oxidizing sterilizing agent accompanied by two non-oxidizing sterilizing agents to carry out preventative sterilization alternatively, controls drug tolerance and resistance of the microbe, can effectively prevent and control propagation and excessive multiplication of the microbe on the surface of the reverse osmosis membrane, thereby preventing the reverse osmosis membrane from being polluted and plugged by the microbe.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The application relates to the fields of using reverse osmosis technology in water treatment to produce boiler feed water and industrial desalinated water, and in particular to a sterilization method for preventing microbial fouling of reverse osmosis membranes. Background technique

[0002] Reverse osmosis is a widely used desalination technology in the preparation of pure water equipment. Reverse osmosis (RO), ultrafiltration (UF), microporous membrane filtration (MF) and electrodialysis (EDI) technologies are all membrane separation technologies.

[0003] The production of desalted water by pressurized membrane separation technology using reverse osmosis (RO) and ultrafiltration (UF) membranes is a typical process for boiler feed water and industrial pure water. Its technological process is briefly described as follows (as shown in the accompanying drawings):

[0004] When production water enters the production area, it first enters the water stora...

Examples

Embodiment Construction

[0039] Method of the present invention specifically comprises the steps:

[0040] 1. Selection of fungicides

[0041] 1) Oxidizing fungicide: usually a strong oxidizing agent, which has a strong killing effect on microorganisms in water. It can denature proteins, and the shell of bacteria is usually a layer of protein, which will lead to the death of bacteria after protein denaturation. Commonly used oxidizing biocides are compounds with oxidizing properties such as chlorine-containing compounds, peroxides, and bromine-containing compounds. These compounds generally have the advantages of fast bactericidal and algae killing speed, high broad-spectrum bactericidal effect, low treatment cost, relatively small impact on environmental pollution, and microorganisms are not easy to produce drug resistance. The disadvantage is that it is greatly affected by organic matter and reducing substances in the water, the action time of the agent is short, and it is also greatly affected by...