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Powdered activated carbon reflux/ultrafiltration combined technology for water treatment plant

A technology of powder activated carbon and combined process, which is applied in the field of water treatment to achieve stable water production, reduce pollution pressure, and improve removal effect

Inactive Publication Date: 2013-07-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the powdered activated carbon mixed liquid is directly discharged during the operation of the current powdered activated carbon-ultrafiltration combined process, the present invention provides a powdered activated carbon mixed liquid reflux process with low cost, simple operation and obvious effect, and the powdered activated carbon in the reflux liquid increases coagulation effect

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  • Powdered activated carbon reflux/ultrafiltration combined technology for water treatment plant

Examples

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Embodiment 1

[0014] In this example, coagulation-sedimentation-powder activated carbon / ultrafiltration combined process is used to treat slightly polluted water, the raw water turbidity is 5.76NTU, UV 254 is 0.058, and DOC is 4.45mg / L. The coagulation stage adopts a clapboard mixing tank, the coagulant adopts polyaluminum chloride with a dosage of 20mg / L (based on commercial quality), and the sedimentation stage adopts an inclined tube sedimentation tank, and the ultrafiltration membrane area is 0.100m 2 , the membrane flux is 40L / (m2.h), the volume of the membrane pool is 0.4L, the system flow rate is 4L / h, the dosage of powdered activated carbon is 5mg / L, and the residence time of the mixed liquid in the membrane pool is 2h. When there is no powdered activated carbon backflow, the turbidity of the sinking water is 1.80NTU, UV 254 is 0.028, DOC is 2.73mg / L, and the concentrated liquid in the membrane tank needs to be emptied every 2 hours. At this time, the water production rate of the s...

Embodiment 2

[0016] In this example, coagulation-sedimentation-powder activated carbon / ultrafiltration combined process is used to treat slightly polluted water, the raw water turbidity is 7.55NTU, UV 254 is 0.068, DOC is 5.32mg / L. The coagulation stage adopts a clapboard mixing tank, the coagulant adopts polyaluminum chloride with a dosage of 25mg / L (based on commercial quality), and the sedimentation stage adopts an inclined tube sedimentation tank, and the ultrafiltration membrane area is 0.100m 2 , the membrane flux is 40L / (m 2 .h), the volume of the membrane pool is 0.4L, the system flow rate is 4L / h, the dosage of powdered activated carbon is 20mg / L, and the residence time of the mixed liquid in the membrane pool is 10h. When there is no powdered activated carbon backflow, the turbidity of the sinking water is 1.92NTU, UV 254 is 0.029, DOC is 3.07mg / L, and the concentrated liquid in the membrane tank needs to be emptied every 10 hours. At this time, the water production rate of the...

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Abstract

The invention relates to a powdered activated carbon reflux / ultrafiltration combined technology for a water treatment plant. The technology is characterized in that powdered activated carbon are fed into an ultrafiltration membrane tank, and the powdered activated carbon which are kept in the ultrafiltration membrane tank for a proper time are refluxed to a pre-treatment coagulation period at a proper reflux ratio through utilizing a reflux pump, wherein the addition amount of the powdered activated carbon is 5-20mg / L, the reflux ratio is 1%-5% of a system flow, and the retention time of the powdered activated carbon is 2-24 hours. The organic pollutant content of raw water is reduced through fully utilizing the adsorptive capability of the powdered activated carbon in a mixed liquid of the technology, powdered activated carbon particles serve as flocculation cores so as to enhance coagulation, and a treatment effect of a coagulation period is improved; and moreover, the operation stability of a system is improved, and the water production rate is increased. The technology can be widely applied to an ultrafiltration combined technology for the water treatment plant.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to an ultrafiltration membrane advanced treatment process of a water purification plant, specifically a coagulation-sedimentation-powder activated carbon reflux / ultrafiltration combined process of a water purification plant. Background technique [0002] 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. The membrane separation process with ultrafiltration as the core has attracted much attention for its advantages of stable effluent quality, small footprint, no secondary pollution, and easy automatic control. It is called the core technology of the third-generation urban drinking water purification process. At present, several ultrafiltration membrane water plants have been built in China. Powdered activated c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 李星刘永旺杨艳玲任家炜臧振武陈楠
Owner BEIJING UNIV OF TECH
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