Advanced treatment and reuse method of pre-coated membrane of tail water of sewage plant

A technology of advanced treatment and pre-coating film, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc. Reduce direct contact, reduce operating costs, and realize the effect of resource utilization

Active Publication Date: 2014-08-06
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, membrane concentrated water has the characteristics of high sa

Method used

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  • Advanced treatment and reuse method of pre-coated membrane of tail water of sewage plant
  • Advanced treatment and reuse method of pre-coated membrane of tail water of sewage plant
  • Advanced treatment and reuse method of pre-coated membrane of tail water of sewage plant

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Implementation case 1:

[0036] The characteristics of the tail water of a sewage treatment plant in an industrial park are as follows: COD 55 mg / L, TN 17.3 mg / L, UV 254 0.232 cm -1 , Turbidity 2.6, conductivity 5610μs / cm. The specific process flow of the advanced treatment and reuse of the tail water pre-coating film is as follows: figure 1 As shown, the tail water after the secondary biochemical treatment is first sent to the conditioning tank for homogenization, and then passed through the quartz sand filter to remove the larger particles of suspended impurities in the wastewater; the zeolite powder is added as a pre-coating material through the dosing device, The particle size is 2000 mesh, and the dosage is 200 mg / L. The solution containing the pre-coated membrane material and the sand filtered water pass through the ultrafiltration membrane. The ultrafiltration membrane is a hollow fiber membrane. A precision filter with a filtration accuracy of 10 μm is set before t...

Example Embodiment

[0039] Implementation case 2:

[0040] The characteristics of the tail water of a sewage treatment plant in an industrial park are as follows: COD 42 mg / L, TN 13.6 mg / L, UV 254 0.207 cm -1 , Turbidity 1.5, conductivity 3950μs / cm. The specific process flow of the advanced treatment and reuse of the tail water pre-coating film is as follows: figure 1 As shown, the tail water after the secondary biochemical treatment is first sent to the conditioning tank for homogenization, and then passed through the quartz sand filter to remove the larger particles of suspended impurities in the wastewater; activated carbon is added as a pre-coating material through the dosing device. The diameter is 500 mesh, and the dosage is 100mg / L. The solution containing the pre-coated membrane material and the sand filtered water pass through the ultrafiltration membrane. The ultrafiltration membrane is a hollow fiber membrane. A precision filter with a filtration accuracy of 30μm is set before the membran...

Example Embodiment

[0043] Implementation case 3:

[0044] The characteristics of the tail water of a sewage treatment plant in an industrial park are as follows: COD 60 mg / L, TN 19.5 mg / L, UV 254 0.271 cm -1 , Turbidity 3.1, conductivity 6630μs / cm. The specific process flow of the advanced treatment and reuse of the tail water pre-coating film is as follows: figure 1 As shown, the tail water after the secondary biochemical treatment is first sent to the conditioning tank for homogenization, and then passed through the quartz sand filter to remove the larger particles of suspended impurities in the wastewater; diatomaceous earth is added as a pre-coating material through the dosing device , The particle size is 1000 mesh, the dosage is 400 mg / L, the solution containing the pre-coated membrane material and the sand filtered water pass through the ultrafiltration membrane. The ultrafiltration membrane is a hollow fiber membrane. A precision filter with a precision of 20μm is set before the membrane mo...

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Abstract

The invention discloses an advanced treatment and reuse method of a pre-coated membrane of tail water of a sewage plant. The method comprises the following steps: firstly, feeding tail water into an adjusting pool so as to be homogenized, and then passing through a sand filter; passing through an ultrafiltration membrane by a solution containing a pre-coated membrane material and sand filtered effluent and effectively forming a dynamic membrane on the surface of the ultrafiltration membrane, wherein concentrated water of the ultrafiltration membrane returns to the adjusting pool while the effluent enters into a middle water tank; backwashing the ultrafiltration membrane through a pump by part of water in the middle water tank periodically, wherein the pre-coated membrane automatically falls and the sediment of the coating material is recycled to a pre-coated membrane material dosing device repeatedly, so that the operating cost is lowered; entering into reverse osmosis membrane treatment by water in the middle water tank, fresh reverse osmosis membrane is used as industrial water in the park to be returned, and the concentrated water is treated by an electrochemical reactor, and the effluent reaches the standard to be discharged. By adopting the pre-coated membrane method, the ultrafiltration backwashing frequency is low, and the water yield of the ultrafiltration membrane is improved. Loose filter cake layers with great holes can be formed to effectively relieve the rate of descent of membrane flux, improve the anti-pollution capacity of the membrane and improve the removal effect of the membrane on the water quality index at the same time.

Description

technical field [0001] The invention belongs to the field of sewage advanced treatment and reuse engineering, and relates to a method for advanced treatment and reuse of tail water of industrial park sewage plants. Background technique [0002] The increasingly tense water resource shortage and water environment pollution have attracted great attention both at home and abroad. Industrial sewage recycling is an effective way to alleviate the shortage of water resources, reduce the degree of water pollution, and improve the ecological environment. How to rationally and effectively comprehensively utilize sewage resources in the park has become the key to solving the problems of water resource utilization and water environment pollution in the park. . The main water quality indicators of the tail water of industrial park sewage plants, such as organic matter, ammonia nitrogen, and salinity, cannot meet the reuse standards and require further advanced treatment. Membrane separ...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/44
Inventor 涂勇陈勇白永刚唐敏刘伟京吴海锁
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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