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Membrane cleaning agent for starch wastewater treatment and preparation method thereof

A technology for starch wastewater and membrane cleaning agent, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of membrane surface pollution, system paralysis, membrane module fouling and blocking, etc., to shorten cleaning time, restore The effect of filtering flux and reducing energy consumption

Inactive Publication Date: 2018-09-04
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After routine biochemical treatment of starch wastewater from starch enterprises, the content of water-soluble organic matter is still high, and most of them are small molecular organic matter. After the wastewater is advanced treated by double-membrane technology, the surface of the membrane is easily polluted by dissolved oil and organic matter, resulting in Membrane module fouling, conventional cleaning agents cannot completely remove the pollutants on the membrane surface, resulting in worsening membrane system operation and eventually system failure

Method used

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  • Membrane cleaning agent for starch wastewater treatment and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0013] Sodium hydroxide 28%, sodium silicate 3.5%, sodium polyphosphate 5.5%, sodium carbonate 4%, zircoaluminate coupling agent 0.1%, ammonium zirconium carbonate 0.05%, nonionic surfactant AES 0.15%, Sodium dodecylbenzenesulfonate 4.3%, fatty alcohol polyoxyethylene ether sulfate 0.5%, acrylonitrile-butadiene-styrene copolymer 0.4%, EDTA disodium salt 6%, diatomaceous earth 3.5%, 5% ethanol, and 39% water are sequentially added into a stirred reactor according to the listed order of the above components, and stirred at room temperature and normal pressure for 4 hours at the same time to obtain the finished product. After cleaning the membrane surface pollutants test, it is measured that the water production of the membrane before and after the membrane cleaning is increased from 115m 3 / h returns to 150m 3 / h, the product water flux of the unused new reverse osmosis membrane is 153m 3 / h.

Embodiment 2

[0015] Sodium hydroxide 32%, sodium silicate 3%, sodium polyphosphate 5%, sodium carbonate 4.5%, zircoaluminate coupling agent 0.18%, ammonium zirconium carbonate 0.07%, nonionic surfactant AES 0.2%, Sodium dodecylbenzene sulfonate 3%, fatty alcohol polyoxyethylene ether sulfate 0.6%, acrylonitrile-butadiene-styrene copolymer 0.45%, edetate disodium salt 4%, diatomaceous earth 3%, 4% ethanol, and 40% water are sequentially added into a stirred reactor according to the listed order of the above components, and stirred at room temperature and normal pressure for 8 hours at the same time to obtain the finished product. After cleaning the membrane surface pollutants test, it is measured that the water production of the membrane before and after the membrane cleaning is increased from 117m 3 / h returns to 158m 3 / h, the product water flux of the unused new reverse osmosis membrane is 158m 3 / h.

Embodiment 3

[0017] Sodium hydroxide 33%, sodium silicate 2%, sodium polyphosphate 4%, sodium carbonate 3%, zircoaluminate coupling agent 0.3%, ammonium zirconium carbonate 0.1%, nonionic surfactant AES 0.3%, Sodium dodecylbenzenesulfonate 3%, fatty alcohol polyoxyethylene ether sulfate 0.7%, acrylonitrile-butadiene-styrene copolymer 0.6%, ethylenediaminetetraacetic acid disodium salt 2%, diatomaceous earth 4%, 4% ethanol, 43% water, according to the listed order of the above components, add them into a stirred reactor in sequence, and stir at room temperature and normal pressure for 5 hours at the same time to obtain the finished product. After cleaning the membrane surface pollutants test, it is measured that the water production of the membrane before and after the membrane cleaning is increased from 117m 3 / h returns to 141m 3 / h, the product water flux of the unused new reverse osmosis membrane is 143m 3 / h.

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Abstract

The invention discloses a membrane cleaning agent for starch wastewater treatment and a preparation method thereof. The membrane cleaning agent disclosed by the invention is prepared by mixing the following components in percentage by weight: 20-35% of sodium hydroxide, 1-5% of sodium silicate, 0-6% of sodium polyphosphate, 0-6% of sodium carbonate, 0.1-0.3% of a zirconium aluminate coupling agent, 0.05-0.1% of ammonium zirconium carbonate, 0.1-0.3% of a nonionic surfactant AES, 3-5% of sodium dodecyl benzene sulfonate, 0.3-0.8% of fatty alcohol polyoxyethylene ether sulfate, 0.3-0.7% of acrylonitrile-butadiene-styrene copolymers, 2-7% of ethylenediamine tetraacetic acid disodium salt, 1-4% of diatomite, 3-7% of ethanol and the balance of water. The membrane cleaning agent disclosed by theinvention is capable of effectively and rapidly removing pollutants on the membrane surface, the filtration flux of the membrane is restored, and regeneration of the system is accelerated, therefore,the energy consumption of the system is reduced.

Description

technical field [0001] The invention belongs to the technical field of membrane surface pollution treatment, in particular to a chemical agent used for cleaning membrane surface pollutants polluted by starch wastewater. Background technique [0002] Membrane fouling cleaner is a chemical agent used to clean membrane surface pollutants polluted by oily wastewater. Dissolving in water can remove membrane surface pollutants, restore membrane pore flow rate, reduce membrane surface pressure difference, and restore water production. This method It is a convenient and economical method to remove pollutants on the membrane surface without adding fixed equipment for pipelines. Starch wastewater comes from the acidic high-concentration organic wastewater produced in the starch processing process. The demon-removing components are starch, glycosides, protein, and cellulose organic substances, which are generally non-toxic, but have a high content of organic matter. Although this waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06
CPCB01D65/02B01D2321/164B01D2321/168
Inventor 刘建秋孟春迎魏文宇
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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