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Method for cleaning polluted membrane by using singlet oxygen produced from peroxymonosulfate under induction of inorganic solid peroxide

A peroxide and inorganic solid technology, applied in the field of membrane cleaning, can solve the problems of inconvenient transportation and storage, complicated process operation, short survival time, etc., and achieve the effects of avoiding unclean cleaning, convenient transportation and storage, and stable chemical properties.

Active Publication Date: 2014-02-05
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

The generation of singlet oxygen by this chemical method is fast, and its second-order reaction rate constant is about 10 4 m -1 the s -1 , that is, the instantaneous production is large, the self-decomposition speed is fast, the survival time is short, and the utilization rate of organic matter is low; the chemical reagent is liquid hydrogen peroxide and hypochlorous acid solution or chlorine gas, the transportation and storage are inconvenient, the process operation is complex and there are potential safety hazards question

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  • Method for cleaning polluted membrane by using singlet oxygen produced from peroxymonosulfate under induction of inorganic solid peroxide

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specific Embodiment approach 1

[0016] Specific Embodiment 1: This embodiment is a method for using inorganic solid peroxide to induce persulfate to produce singlet oxygen to clean membrane pollution, which is achieved through the following steps: a. Clean the polluted membrane module Put into the pond that tap water is housed; b, inorganic solid peroxide and peroxymonosulfate are joined in the pond of step 1 according to the ratio of mass ratio being 1:(0.5~5), stir evenly, control peroxomonosulfuric acid The salt concentration is 50-1000 mg / L, soak for 10-180 minutes; c, put the membrane module soaked in step b into another pool filled with tap water for rinsing, that is, the use of inorganic solid peroxide to induce persulfate Generate singlet oxygen to clean membrane fouling.

[0017] The membrane material of the contaminated membrane module described in this embodiment is polyvinylidene fluoride (PVDF), polyethersulfone (PES), polyethylene (PE) or polyvinyl chloride (PVC).

[0018] The inorganic solid ...

specific Embodiment approach 2

[0022] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the inorganic solid peroxide is sodium peroxide (Na 2 o 2 ), calcium peroxide (CaO 2 ), magnesium peroxide (MgO2 ), barium peroxide (BaO 2 ), sodium percarbonate (Na 2 CO 4 ), potassium percarbonate (K 2 CO 4 ) of one or a mixture of several. Other parameters are the same as in the first embodiment.

[0023] In this embodiment, when the inorganic solid peroxide is a mixture of some of them, it is mixed in any ratio.

specific Embodiment approach 3

[0024] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the persulfate is: sodium persulfate (NaHSO 5 ), potassium persulfate (KHSO 5 ), ammonium persulfate (NH 4 HSO 5 ), calcium persulfate (Ca(HSO 5 ) 2 ), magnesium persulfate (Mg(HSO 5 ) 2 ) in one or several mixtures in any ratio. Other parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a method for cleaning polluted membrane by using singlet oxygen produced from peroxymonosulfate under induction of inorganic solid peroxide and relates to a membrane cleaning method. The method for cleaning a polluted membrane comprises the following steps: adding the inorganic solid peroxide and the peroxymonosulfate in a tank containing a polluted membrane module, stirring, soaking, and finally rinsing. According to the method, after the peroxide is dissolved in water, hydrogen peroxide slowly released reacts with the peroxymonosulfate rapidly to generate the high-activity singlet oxygen which directly acts on biological cells polluting the membrane to rapidly destroy enzymatic structures, thus achieving a good membrane cleaning effect. As environmentally-friendly reagents, the inorganic solid peroxide and the peroxymonosulfate do not generate poisonous and harmful byproducts in the cleaning process, and waste liquid can be directly discharged after the membrane is cleaned; and as solid reagents, the inorganic solid peroxide and the peroxymonosulfate can be directly added for use without need of additional equipment. The method has the advantages that the operation is simple and practicable, and the reagents are convenient to transport and store, low in cost and easy to obtain.

Description

technical field [0001] The invention relates to a membrane cleaning method, in particular to a method for cleaning membrane pollution by using inorganic solid peroxide to induce persulfate to generate singlet oxygen. 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 th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06
Inventor 庞素艳王强郭晓瑜江进鲁雪婷黄亮郭仕达王玲
Owner HARBIN UNIV OF SCI & TECH
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