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Method for performing water purification plant advanced treatment by using submerged ultrafiltration membrane

An advanced treatment and ultrafiltration membrane technology, applied in the field of water treatment, can solve the problems of high content of suspended solids and turbidity in the effluent, the system is not resistant to impacts on the effluent water quality, and the complete set of equipment occupies a large area, achieving less dehydration facilities and automation The effect of high degree and convenient maintenance and replacement

Inactive Publication Date: 2016-02-03
HUBEI JUNJI WATER TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: the filtration accuracy is not high (0.1-10 microns), resulting in a low retention rate of powdered activated carbon; easy to block, high frequency of backwashing and large amount of backwashing water, resulting in high energy consumption; the content of suspended solids and turbidity in the effluent is relatively high High; in the case of large fluctuations in incoming water, the system is not resistant to impact, resulting in unstable water quality; the amount of carbon used is large, and the complete set of equipment occupies a large area

Method used

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  • Method for performing water purification plant advanced treatment by using submerged ultrafiltration membrane

Examples

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Effect test

Embodiment 1

[0046] In this example, a city waterworks uses "coagulation-sedimentation-submerged ultrafiltration membrane treatment system-disinfection-water distribution" to treat raw water. After precipitation, the turbidity of the effluent is 3.58NTU, and the CODmn is 5.4mg / L , DOC is 4.76mg / L, a pilot test is conducted for the effluent of the sedimentation tank of the plant, and the scale of the pilot test is 200m 3 / d. Its process parameters are as follows:

[0047] (1) Dosing amount of activated carbon: The average daily amount of carbon added is about 125mg / L.

[0048](2) Carbon discharge: The carbon discharge frequency of the pilot test is once a day, 1 to 2 hours each time, the carbon discharge is about 0.5m3 / d, the concentration is 24g / L, and the carbon discharge and carbon addition are in balance.

[0049] (3) Carbon slurry circulation in the submerged ultrafiltration membrane separation tank: the carbon slurry circulation is 1.5 times of the influent flow.

[0050] (4) Carbo...

Embodiment 2

[0060] In this example, a waterworks in a city uses "coagulation-sedimentation-submerged ultrafiltration membrane treatment system-disinfection-water distribution" to treat raw water. After precipitation, the turbidity of the effluent is 4.94NTU, and the CODmn is 5.8mg / L , the DOC is 5.27mg / L, and the pilot test is carried out for the effluent of the sedimentation tank of the plant. The scale of the pilot test is 200m 3 / d. Its process parameters are as follows:

[0061] (1) Dosing amount of activated carbon: The average daily amount of carbon added is about 150mg / L.

[0062] (2) Carbon discharge: The carbon discharge frequency of the pilot test is once a day, 1 to 2 hours each time, the carbon discharge is about 0.9m3 / d, the concentration is 33.4g / L, and the carbon discharge and carbon addition are in balance.

[0063] (3) Carbon slurry circulation in the submerged ultrafiltration membrane separation tank: the carbon slurry circulation is twice the influent flow.

[0064] ...

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Abstract

The invention discloses a method for performing water purification plant advanced treatment by using a submerged ultrafiltration membrane. The method comprises five steps of adding powdered activated carbon, performing carbon-water premixing, performing activated carbon adsorption and carbon-water separation, performing carbon slurry settling concentration for dehydration and regenerating the powdered activated carbon. The fed water of waterworks is pumped into a carbon-water premixing tank and is uniformly and fully mixed with carbon slurry refluxed out of a submerged ultrafiltration membrane separation tank; then the mixture is put into the submerged ultrafiltration membrane separation tank for performing membrane separation of carbon and water, and a small part of outlet water is reused and is subjected to membrane back flushing; and the carbon slurry in a carbon-water premixing tank is discharged into a concentration tank for concentration, and then is delivered into pressure filtration equipment for dehydration and recovery, and the recovered activated carbon is treated by a baking regeneration activation process for recycling. According to the method disclosed by the invention, the adsorbing effect of the powdered activated carbon on micromolecular organic matters is well combined with a sieving effect of the ultrafiltration membrane on pathogenic microorganism including macromolecular organic matters and bacteria, so that the removal rate of the organic matters is greatly improved, and meanwhile, the powdered activated carbon can be reused after regeneration.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a method for advanced treatment of sewage, in particular to a method for advanced treatment of sewage by combining powdered activated carbon adsorption and submerged ultrafiltration membrane separation. Background technique [0002] At present, most of the waterworks in my country still adopt the conventional process, that is, "dosing, coagulation and sedimentation--filtration--disinfection--transportation and distribution of water". With the deterioration of surface water quality and the continuous improvement of drinking water quality standards, traditional water treatment processes can no longer meet people's requirements for drinking water; in addition, conventional processes lack oxidation and adsorption technologies to remove organic matter. For waterworks, due to the continuous deterioration of water sources, many waterworks continue to increase the dosage of liquid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F101/30
Inventor 刘鲁建董俊陈亮刘卫勇方潇张双峰熊蔚
Owner HUBEI JUNJI WATER TREATMENT
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