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Water filtering method

A raw water and ultrafiltration membrane technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve pollution and other problems, reduce concentration, improve flocculation effect, loose fractal The effect of dimensionality

Active Publication Date: 2014-06-25
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] So far, there is no report on the in situ formation of Fe(III) in membrane pretreatment in water treatment to control membrane fouling and remove organic matter at the same time

Method used

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Embodiment 1

[0017] Add humic acid to tap water after dechlorination to obtain experimental water (that is, raw water). The dosage ratio of humic acid to tap water is 5mg: 1L. The basic parameters of this experimental water distribution are as follows: TOC is 4.08mg / L, and turbidity is 3.32NTU , pH value is 7.95.

[0018] Add potassium permanganate and ferrous chloride with a molar ratio of 1:3 to the above experimental water at the same time (the ratio of ferrous salt to raw water is 0.1mmol:1L), and mix for 1 minute at 25°C Carry out flocculation reaction again 15 minutes, enter membrane reactor afterwards, carry out constant flow filtration by peristaltic pump, water flow rate is 20L / (m 2 h), the membrane filter module used for filtration is PVDF (polyvinylidene fluoride) submerged (that is, external pressure) hollow fiber membrane, and the water quality of the resulting water is as follows: TOC is 1.57mg / L, turbidity is 0.05NTU, The pH is 7.40.

[0019] According to the above steps, ...

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Abstract

The invention discloses a water filtering method. The method includes the following steps: adding potassium permanganate and ferrite into raw water, evenly mixing to enable potassium permanganate and ferrite to be subjected to a flocculation reaction to form floccules, and then filtering the water solution. According to the method, ferrous iron is oxidized by potassium permanganate, under the action of organic matters and the efficient flocculation of ferric iron formed in situ, the concentration of pollutants in the water can be reduced, the flocculation effect can be improved, the size of initial particles forming the floccules is enlarged, the degree of density and the thickness of a cake layer on the surface of a membrane are reduced, and thus the purposes of controlling membrane fouling and water filtering are achieved.

Description

technical field [0001] The invention belongs to the field of water purification by membrane filtration in water treatment, and in particular relates to a method for filtering water. Background technique [0002] In water supply and wastewater treatment, the main problem hindering the application of membranes is membrane fouling. As a pretreatment method, chemical coagulation can have a certain impact on the membrane fouling of the MF / UF system. FeCl 3 As a coagulant for pretreatment, it has a significant effect on delaying membrane fouling and can better remove natural organic matter. The coagulated flocs can also effectively absorb the remaining neutral hydrophobic small molecular substances in the water, improve the membrane flux and reduce membrane fouling. [0003] So far, there is no report about the in situ formation of Fe(III) in the membrane pretreatment for the control of membrane fouling and the simultaneous removal of organic matter in water treatment. Conten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/44C02F1/52
Inventor 曲久辉俞文正刘会娟刘锐平兰华春李慧
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI