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Online method for sterilizing and inhibiting bacteria of reverse osmosis membranes

A technology of reverse osmosis membrane and reverse osmosis, applied in chemistry and other directions, can solve the problems of low efficiency, large amount of dosing, narrow effect surface, etc., and achieve the effect of prolonging replacement frequency and reducing operating cost.

Active Publication Date: 2011-04-13
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no published literature that clearly gives the cycle of regular shock sterilization of reverse osmosis membranes. In the existing public literature, when shock sterilization is used to solve the problem of microbial contamination, the agents used are mostly sodium bisulfite NaHSO 3 Mainly, while NaHSO 3 As a fungicide, the dosage is large, the efficiency is low, the action area is narrow, and the effect is not ideal.

Method used

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  • Online method for sterilizing and inhibiting bacteria of reverse osmosis membranes
  • Online method for sterilizing and inhibiting bacteria of reverse osmosis membranes
  • Online method for sterilizing and inhibiting bacteria of reverse osmosis membranes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] The process flow of advanced treatment and reuse of oil refinery production wastewater after secondary biochemical treatment in a factory is: pretreatment-ultrafiltration-reverse osmosis, and the design influent water volume of reverse osmosis is 200m 3 / h. The reverse osmosis concentrated water quality in summer is as follows: COD is 190mg / L, TOC is 62.8mg / L, bacteria content is 1100cfu / ml, and the temperature is 40°C.

[0069] The concentrated reverse osmosis water was taken from the sampling port as the culture water source, the culture temperature was set to 40°C, the measurement frequency was once every 4-8 hours, and the culture time was set to 6 days. The bacterial growth curve at 40°C was obtained as image 3 shown.

[0070] From image 3 It can be determined that the logarithmic growth period of bacteria is 72-100h, which is about 3-4 days. It is determined that the impact sterilization cycle in summer is 3 days. The alternate cycle of two rounds of cleani...

Embodiment 2

[0077] For the wastewater reuse system in Example 1, the quality of reverse osmosis concentrated water in winter is: COD is 210mg / L, TOC is 70mg / L, bacteria content is 150cfu / m3, and the temperature is 25°C.

[0078] Take the concentrated reverse osmosis water from the sampling port as the culture water source, set the culture temperature as 25°C, measure the frequency as 1 time / 4-12h, and set the culture time as 12 days. The bacterial growth curve at 25°C is as follows Figure 4 shown.

[0079] From Figure 4 It can be determined that the logarithmic growth period of bacteria is 170-210h, which is about 7-9 days. It is determined that the impact sterilization cycle in winter is 7 days.

[0080] Isothiazolinone (1.5%) was selected as the fungicide for the first round of cleaning, the concentration of the prepared cleaning solution was 150 mg / L, and the alternate cycle was 2 times a cycle. The flux is 9L / m 2 h, that is, the flow rate is 100m 3 / h Inject the cleaning solut...

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Abstract

The invention discloses an online method for sterilizing and inhibiting bacteria of reverse osmosis membranes, which relates to a method for preventing the reverse osmosis membranes from microbial contamination. The method is characterized by comprising the following steps of: firstly, determining the sterilization cycle of the reverse osmosis membranes; secondly, carrying out the first round of sterilization with a cleaning solution prepared by choosing one non-oxide bactericide; thirdly, carrying out the second round of sterilization with the cleaning solution prepared by choosing another non-oxide bactericide; and fourthly, repeating the second and the third steps. The method makes the impact sterilization cycle of the reverse osmosis membranes clear, can kill microbes before apposition growth on the reverse osmosis membranes massively, improves the sterilization efficiency and effect, guarantees the long-term stable operation of a reverse osmosis system, and prolongs the service life of the reverse osmosis membranes.

Description

technical field [0001] The present invention relates to a method for controlling microbial contamination of reverse osmosis membranes, in particular to an on-line sterilization and antibacterial method for reverse osmosis membranes, and in particular to a method for controlling microbial contamination of reverse osmosis membranes in a system using membrane technology for advanced sewage treatment and reuse Methods. Background technique [0002] With the development of industry and the increasing scarcity of water resources, vigorously developing water reuse has become a major theme of the development of the environmental protection industry. Vigorously developing the sewage reuse business can not only save limited water resources, alleviate the increasingly prominent water tension, but also reduce sewage discharge, reduce pollution to surrounding water bodies, improve the living environment of human beings, and save a lot of water resource fees. . [0003] In the developme...

Claims

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Application Information

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IPC IPC(8): A61L2/18A61L101/32A61L101/44
Inventor 赵辉刘正侯秀华龚小芝赵鹏彭海珠孙杰
Owner CHINA PETROLEUM & CHEM CORP
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