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Coagulation filtering method

A filtration method and coagulation technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, special treatment targets, etc., can solve the problems of increasing the amount of discharged water, worsening the turbidity of the treated water, and reducing the water recovery rate. , to achieve the effect of reducing usage and reducing the frequency of regeneration

Active Publication Date: 2012-08-29
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of discharged water to the outside of the system is increased by the above-mentioned back wash, resulting in a decrease in the water recovery rate
In addition, in the coagulation filtration method, if the linear velocity is increased, the filter material (filter material) cannot capture the turbidity, and the turbidity of the treated water will deteriorate.

Method used

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  • Coagulation filtering method
  • Coagulation filtering method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] [Example 1, Comparative Example 1]

[0042] The industrial water of the water quality shown in Table 1 was subjected to the following SS rough separation treatment, and then water was passed into the cation exchange resin column under the following conditions.

[0043] Table 1 Water quality of industrial water

[0044] project

unit

Analysis value

pH

-

7.6

Conductivity

mg / m

37

M base

mg / L

83

SS

mg / L

6.1

Turbidity

Spend

4

Chroma

Spend

6

[0045]

[0046] The coagulation operation was carried out under the conditions of PAC 50 mg / L and coagulation pH 6.5, and the coagulated water was treated by pressurized suspension to roughly separate SS. The pH of the pressurized suspension treated water was 6.5, and the SS concentration was 3.8mg / L.

[0047]

[0048] Example 1: Weakly acidic cationic resin (WC-10, manufactured by Mitsubishi Chemical C...

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Abstract

The invention aims to provide a coagulation filtering method which can obtain coagulation filtering water in good quality with low cost. The coagulation filtering method comprises the steps of conducting coagulating by adding cation type coagulant into processed water; conducting filtering by means of a filter whose filtering materials are partially arranged as cation exchange resin which uses faintly acid cation exchange resin. When quality of filtering water from the filter exceeds the regulated value, regeneration is conducted on the faintly acid cation exchange resin.

Description

technical field [0001] The invention relates to a method for coagulating and filtering water containing turbidity. Background technique [0002] When clarified water is required as supplementary water for pure water equipment, etc., the coagulation filtration method is widely used as a method for removing turbidity in raw water. In addition, when waste water is recovered and reused through a reverse osmosis membrane, coagulation filtration treatment is sometimes performed as a turbidity removal treatment before the reverse osmosis membrane. [0003] In this coagulation filtration method, if the captured amount of SS (suspended solids) exceeds a predetermined amount, the water flow pressure is increased to ensure the water flow rate, so that turbidity may leak. Therefore, regular backwashing is required. The amount of discharged water to the outside of the system is increased by the above-mentioned back wash, resulting in a decrease in the water recovery rate. In addition,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/42
CPCC02F1/42C02F1/52C02F2001/427C02F2303/16
Inventor 山田聪
Owner KURITA WATER INDUSTRIES LTD
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