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Tap water treatment method and method for reducing membrane pollution in water treatment process

A treatment method and treatment process technology, applied in the field of water treatment

Pending Publication Date: 2018-07-31
北京市自来水集团有限责任公司技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the use of ultraviolet technology in sewage treatment and drinking water treatment has been widely used in recent years, its use in drinking water treatment is still limited to the disinfection stage of subsequent processes, and it is used to remove bacteria, viruses, fungi and other microorganisms in tap water.

Method used

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  • Tap water treatment method and method for reducing membrane pollution in water treatment process
  • Tap water treatment method and method for reducing membrane pollution in water treatment process
  • Tap water treatment method and method for reducing membrane pollution in water treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] 1. Raw water pretreatment

[0086] The raw water is passed into the high-density sedimentation tank, ozone contact tank, and carbon sand filter in sequence, and then undergoes coagulation sedimentation treatment, ozone oxidation treatment, and adsorption filtration treatment in sequence; among them: coagulant three is added to the high-density sedimentation tank during the coagulation sedimentation process. Ferric chloride, coagulant dosage is 10-40mg / L; coagulation treatment time is 90min (usually 60-120min), water temperature is 10°C (usually 0-40°C, preferably 0-30°C); ozone The dosage of ozone in the oxidation treatment process is 0.5mg / L (usually 0-2mg / L); the ozone contact time is 11.69min (usually 5-12min), and the water temperature is 10°C (usually 0-40°C, Preferably 0-30°C); carbon sand filter filter cycle 36-48h; contact time 12.8min (usually 2-20min); carbon sand filter backwash intensity 12-19L / m 2 s; the filter layer of the carbon sand filter is activated ...

Embodiment 2

[0105] 1. Raw water pretreatment

[0106] The raw water passes through the high-density sedimentation tank and quartz sand filter in turn, and then undergoes coagulation sedimentation treatment and sand filtration treatment in turn; among them, the high-density sedimentation tank for coagulation sedimentation treatment is added with coagulant ferric chloride, and the amount of coagulant 10-50mg / L, the coagulation treatment time is 90min, the water temperature is 20°C; the filtration period of the quartz sand filter is 24-36h (usually 16-36h), and the filtration rate is 8.45m / h (usually 2-15m / h, preferably 8-9m / h); the backwash intensity of the quartz sand filter is 15L / m 2 s (usually 12-19L / m 2 s);

[0107] The water quality of the effluent filtered by the quartz sand filter is monitored according to the "National Standard for Tap Water Quality of the People's Republic of China" (GB5749-2006), and the measurement results are as follows:

[0108] Turbidity (NTU): Mn (mg / L):...

Embodiment 3

[0120] 1. Raw water pretreatment

[0121] The raw water passes through the mixing well, the mechanical accelerated clarification tank, and the quartz sand filter in sequence; the coagulation sedimentation treatment and the quartz sand filtration treatment are carried out in sequence. The dosage of the agent is 10-40mg / L; the total residence time of the mechanical acceleration clarifier is 90min, that is, the coagulation treatment time is 90min; the water temperature is 30°C; the filtration period of the quartz sand filter is 16-24h; the filtration rate is 8.45m / h ( Usually 2-10m / h); the backwash intensity of quartz sand filter is 12-19L / m 2 s;

[0122] The quality of the effluent water filtered by quartz sand is monitored in accordance with the "National Standard for Tap Water Quality of the People's Republic of China" (GB5749-2006), and the measurement results are as follows:

[0123] Turbidity (NTU): Mn (mg / L): <2.0 pH: 7.50-8.50

[0124] Fe(mg / L):<0.05Al(mg / L):<0.20

[...

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Abstract

The invention discloses a tap water treatment method and a method for reducing membrane pollution in the water treatment process. The tap water treatment method comprises the steps that raw water is subjected to pretreatment and then subjected to ultraviolet radiation, ultrafiltration and chlorine disinfection in sequence. In the tap water treatment method, the ultrafiltration and ultraviolet processes in an original water treatment technology are adjusted, the disinfecting function that ultraviolet radiation controls microorganisms is reserved, and meanwhile, the effect for protecting an ultrafiltration membrane is added; the pollution to an ultrafiltration membrane in the ultrafiltration process is reduced, operation energy consumption is reduced, the service life of the membrane in themembrane treatment process is obviously prolonged, the tap water treatment cost is reduced, the aims of energy conservation and emission reduction are achieved, and the method highly accords with theenvironmental protection concept of green technologies.

Description

technical field [0001] The invention relates to a water resource treatment method, in particular to a drinking water purification method, and belongs to the field of water treatment. Background technique [0002] Drinking water refers to water that can be directly supplied to the human body for drinking without treatment. Water is the main component of human body fluid, and is an important substance that constitutes cells, tissue fluid, plasma, etc. As the medium of all chemical reactions in the body, water is a platform for the transportation of various nutrients and substances. [0003] At present, the purification treatment method of drinking water generally adopts the following method: after the raw water is treated by coagulation and sedimentation, and then treated by two or more of filtration, ozonation, adsorption filtration or ultrafiltration, and then subjected to ultraviolet or ultraviolet Disinfect in sequence with sodium hypochlorite, and finally enter the clea...

Claims

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Application Information

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IPC IPC(8): C02F9/08
CPCC02F1/001C02F1/283C02F1/32C02F1/441C02F1/442C02F1/444C02F1/5236C02F1/76C02F1/78C02F9/00C02F2303/04
Inventor 张晓岚顾军农李玉仙
Owner 北京市自来水集团有限责任公司技术研究院
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