Method for cleaning membrane pollution with high-activity singlet oxygen

A singlet oxygen and membrane fouling technology, applied in the field of membrane cleaning, can solve the problems of inconvenient transportation and storage, complex process operation and safety hazards, etc., and achieve the effect of easy acquisition, low price and strong oxidation ability

Inactive Publication Date: 2014-01-22
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The formation rate of singlet oxygen in this reaction is very fast, and its second-order reaction rate constant is about 10 4 m -1 the s -1 , but the chemical reagents are liquid hydrogen peroxide and hypochlorous acid solution or chlorine gas, which is inconvenient for transportation and storage, complicated process operation and potential safety hazards

Method used

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  • Method for cleaning membrane pollution with high-activity singlet oxygen
  • Method for cleaning membrane pollution with high-activity singlet oxygen
  • Method for cleaning membrane pollution with high-activity singlet oxygen

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specific Embodiment approach 1

[0019] Specific Embodiment 1: This embodiment is a method for cleaning membrane fouling by using highly active singlet oxygen, which is achieved through the following steps: a. Putting the polluted membrane module to be cleaned into a pool filled with tap water; b. Add solid bleaching powder and inorganic solid peroxide into the pool in step 1 according to the mass ratio of (1-10):1, and stir evenly. When the peroxide concentration is 50-1000mg / L, the soaking time of the membrane module is Under the condition of 10 to 180 minutes, the membrane module is cleaned; c. Put the cleaned membrane module into another pool filled with tap water for rinsing, that is, the cleaning of membrane pollution by using highly active singlet oxygen is completed.

[0020] The membrane material of the contaminated membrane module described in this embodiment is polyvinylidene fluoride (PVDF), polyethersulfone (PES), polyethylene (PE) or polyvinyl chloride (PVC).

[0021] The solid bleaching powder ...

specific Embodiment approach 2

[0025] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass ratio of solid bleaching powder to inorganic solid peroxide is (2-9):1. Other parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the mass ratio of solid bleaching powder to inorganic solid peroxide is (3-8):1. Other parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method for cleaning membrane pollution with high-activity singlet oxygen, and relates to methods for cleaning membranes. The method for cleaning the membrane pollution with the high-activity singlet oxygen comprises the steps that solid bleaching powder and inorganic solid peroxide are added to a pool with a polluted membrane component, and the polluted membrane component is stirred, soaked and then bleached. The peroxide is calcium peroxide, magnesium peroxide, barium peroxide, sodium percarbonate and potassium percarbonate. Hypochlorite ions provided by the bleaching powder in the method for cleaning a membrane fast react with hydrogen peroxide released after the peroxide is dissolved in water to generate the high-activity singlet oxygen, the high-activity singlet oxygen directly acts on biological cells with the membrane pollution, the enzymatic structure is fast damaged, and the membrane cleaning effect is good. The high-activity singlet oxygen is an environment-friendly reagent, poisonous and harmful by-products cannot be generated in the cleaning process, and waste liquid can be directly discharged after the cleaning. The high-activity singlet oxygen can be directly added for use as a solid reagent, equipment does not need to be additionally arranged, the operation is simple and easy to carry out, the agents are convenient to transport and store, the price is low, and the agents are easy to obtain.

Description

technical field [0001] The invention relates to a membrane cleaning method. Background technique [0002] With the requirements for high separation and purification of substances, membrane filtration technology has emerged as the times require, and has become a new high separation, concentration, purification and purification technology. Due to its advantages of no phase change, low energy consumption, and clean system, it has been widely used in the fields of medicine, food, chemical industry, and water treatment, and has developed rapidly in countries all over the world. However, as the operating time of the membrane increases, the inorganic matter, suspended matter, organic matter and microorganisms in the raw material liquid to be treated will be adsorbed or deposited on the surface of the membrane or in the pores of the membrane through physical, chemical and mechanical interactions with the membrane material. The membrane pore size becomes smaller or clogged, resultin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06
Inventor 江进庞素艳马军
Owner HARBIN INST OF TECH
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