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Hyperfiltration reverse- rinsing water recovery processing method and device thereof

A technology for recycling and backwashing water, which is applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc. It can solve the problems of low recovery efficiency and achieve high recovery efficiency , saving water resources, good water quality

Inactive Publication Date: 2009-11-04
天津市华宇膜技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using conventional methods to recycle membrane backwash water has the following disadvantages: the one is that the recovery efficiency is low; Insects); third, the separated water needs to be sent back to the raw water for further purification treatment

Method used

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  • Hyperfiltration reverse- rinsing water recovery processing method and device thereof
  • Hyperfiltration reverse- rinsing water recovery processing method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] An experiment was carried out on the backwash water of an ultrafiltration membrane. The water quality conditions were: water temperature 12.3-14.2°C, pH 7.81-7.95, turbidity 5.21-8.14NTU, permanganate index 4.76-7.21mg / L, UV 254 0.042~0.045cm -1 . The membrane backwash water first enters the recovery adjustment tank, and then the amount of FeCl is added to the backwash water discharged from the recovery adjustment tank. 3 Coagulant FeCl calculated as 15mg / L 3 , the wastewater then enters the pipeline mixer for mixing, and the outlet water of the pipeline mixer enters the membrane tank of the submerged membrane device after adding 10mg / L powdered activated carbon. The suction negative pressure in the inner cavity passes through the membrane to obtain ultrafiltration backwash water and recover the effluent. The filtration cycle of the submerged membrane device is 20 minutes. After the filtration cycle is over, backwashing is performed, and one round of backwashing is p...

Embodiment 2

[0028] An experiment was carried out on the backwash water of an ultrafiltration membrane. The water quality conditions were: water temperature 13.2-14.8°C, pH 7.82-7.94, turbidity 6.34-7.56NTU, permanganate index 5.83-6.25mg / L, UV 254 0.044~0.057cm-1 . Membrane backwash water first enters the recovery adjustment tank, and then the amount of FeCl is added to the backwash water discharged from the recovery adjustment tank. 3 Coagulant FeCl calculated as 20mg / L 3 , the waste water then enters the pipeline mixer for mixing, and the outlet water of the pipeline mixer enters the membrane tank of the submerged membrane device after adding 15mg / L powdered activated carbon. The suction negative pressure in the inner cavity passes through the membrane to obtain ultrafiltration backwash water and recover the effluent. The filtration period of the submerged membrane device is 25 minutes. After the filtration period, backwashing is performed, and two rounds of backwashing are performed ...

Embodiment 3

[0030] An experiment was carried out on the backwash water of an ultrafiltration membrane. The water quality conditions were: water temperature 13.1-14.6°C, pH 7.76-8.02, turbidity 6.47-9.21NTU, permanganate index 5.63-7.12mg / L, UV 254 0.041~0.062cm -1 . Membrane backwash water first enters the recovery adjustment tank, and then the amount of FeCl is added to the backwash water discharged from the recovery adjustment tank. 3 Coagulant FeCl calculated as 20mg / L 3 , the wastewater then enters the pipeline mixer for mixing, and the outlet water of the pipeline mixer enters the membrane tank of the submerged membrane device after adding 30mg / L powdered activated carbon. The suction negative pressure in the inner cavity passes through the membrane to obtain ultrafiltration backwash water and recover the effluent. The filtration period of the submerged membrane device is 25 minutes. After the filtration period, backwashing is performed, and two rounds of backwashing are performed...

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Abstract

The invention discloses a method for recovering and treating ultrafiltration backwash water. The treatment method comprises the following steps: a. The membrane backwash water first enters a recovery adjustment tank; b. Dosing FeCl3 in the backwash water discharged from the recovery adjustment tank The coagulant FeCl3 is calculated as 15-30mg / L, and then the wastewater enters the pipeline mixer for mixing; c. The effluent of the pipeline mixer enters the membrane tank of the submerged membrane device after adding 10-30mg / L powdered activated carbon; d. The water entering the membrane tank is sucked by the filter pump, and the hydrostatic pressure and the suction negative pressure of the inner chamber of the membrane are used to pass through the membrane to obtain ultrafiltration backwash water and recover the effluent. The recovery method and device of the present invention have the advantages of high recovery efficiency, good effluent quality, high degree of self-control, long-term low-cost continuous operation, etc., and the effluent quality meets the requirements of the national drinking water quality standard, reducing the discharge of waste water.

Description

technical field [0001] The invention relates to a backwashing water recovery treatment method and a device thereof, in particular to a backwashing water recovery treatment method and a device thereof aimed at ultrafiltration membrane treatment of drinking water. Background technique [0002] In recent years, membrane technology has become the core technology concerned in the field of water treatment all over the world, especially ultrafiltration and microfiltration, which are widely used in drinking water treatment. However, in practical applications, ultrafiltration and microfiltration membrane systems require regular backwashing, usually every 15 to 60 minutes, resulting in a large amount of backwashing water. At present, there are two methods for the treatment and disposal of membrane backwash water: recycling or discharge. Discharges include discharges into nearby water bodies or into urban sewer networks. No matter what kind of discharge method is selected, it is a wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/02C02F1/44C02F1/52C02F9/02C02F9/04
Inventor 何文杰刘德滨胡建坤卜建伟李爱斌肖峰王健孙慧娴
Owner 天津市华宇膜技术有限公司
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