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Method for dephosphorization in sewage

A sewage and water entry technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of incomplete phosphorus removal, high cost, secondary pollution, etc. The regeneration method is simple and easy to implement, the time is short, and the cost is low.

Inactive Publication Date: 2011-03-30
JIANGXI JDL ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides an economical and high-efficiency method for the problems of incomplete removal of phosphorus, high cost, easy to cause secondary pollution and the shortcomings of ion exchange method in pretreatment and regenerated eluent treatment in current sewage phosphorus removal technology. The phosphorus removal method is used for the direct treatment of phosphorus-containing sewage or the advanced treatment of phosphorus-containing sewage after biological treatment, reducing the phosphorus content of the final effluent to below 0.5mg / L, and avoiding excessive phosphorus discharge into the water body to cause eutrophication. At the same time, the ion exchange eluent containing high concentration of phosphorus is further concentrated and separated to realize the recycling of sewage resources

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  • Method for dephosphorization in sewage

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Effect test

Embodiment 1

[0016] Phosphorus-containing sewage from an automobile manufacturing plant, the water quality is as follows: phosphorus content 4.5-5.4 mg / L, turbidity 8.6-1 74.9 NTU. Adopt the inventive method to carry out dephosphorization, and the specific implementation mode is:

[0017] (1) Phosphorus-containing sewage is first filtered through a microfiltration membrane. The microfiltration membrane is a polyethylene tubular microfiltration membrane with a membrane pore size of 0.1-1 μm and a porosity of 70-95%. The operation adopts dead-end filtration, and the operating pressure difference is 0.1-0.3 Mpa, the turbidity of the product water after microfiltration treatment is less than 1.0 NTU;

[0018] (2) The water produced by microfiltration enters the ion exchange fixed bed, and the fixed bed is filled with strong alkali acrylic anion exchange resin, the phosphorus in the sewage is absorbed and enriched in the fixed bed, the phosphorus content drops below 0.5mg / L, and the produced wa...

Embodiment 2

[0022] The water quality of the effluent of a city sewage treatment plant after biological treatment is as follows: phosphorus content 1.0-1.5 mg / L, SS=6.8-24.3 mg / L. Adopt the method of the present invention to carry out depth dephosphorization treatment, the specific implementation mode is:

[0023] (1) Phosphorus-containing sewage is first filtered through a microfiltration membrane. The microfiltration membrane is a polyvinylidene fluoride hollow fiber membrane with a pore size of 0.05-0.2 μm and a porosity of 50-70%. Cross-flow filtration is used during operation, and the operating pressure difference 0.01~0.045Mpa, after microfiltration treatment, the produced water SS<1.0 mg / L;

[0024] (2) The water produced by microfiltration enters the ion exchange fixed bed, which is filled with macroporous strong base quaternary ammonium anion exchange resin, the phosphorus in the sewage is absorbed and enriched in the fixed bed, and the phosphorus content drops below 0.4mg / L , th...

Embodiment 3

[0028] The water quality of the effluent of an urban sewage treatment plant after biological treatment is as follows: phosphorus content 0.8-1.2 mg / L, SS=4.2-18.6 mg / L. Adopt the method of the present invention to carry out depth dephosphorization treatment, the specific implementation mode is:

[0029] (1) Phosphorus-containing sewage is first filtered through a microfiltration membrane. The microfiltration membrane is a cellulose acetate membrane with a pore size of 0.2-10 μm and a porosity of 30-45%. Cross-flow filtration is used during operation, and the operating pressure difference is 0.05-0.1Mpa , after microfiltration treatment, the product water SS<1.0 mg / L;

[0030] (2) The water produced by microfiltration enters the ion exchange fixed bed, and the fixed bed is filled with strong alkali styrene anion exchange resin, the phosphorus in the sewage is absorbed and enriched in the fixed bed, and the phosphorus content drops below 0.4mg / L. water enters the clear pool;

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Abstract

The invention provides an economic and efficient dephosphorization method, comprising the steps of microfiltration and ion exchange. In the method, (1) phosphoric sewage is filtered by a microfiltration membrane to intercept and remove suspended matters, bacteria and colloid substances larger than 0.1micron, produced water subjected to pretreatment is lead to an ion exchange column, phosphorus in the sewage is adsorbed by a dephosphorization adsorbent, and the produced water is finally lead to a clear water tank; and (2) the saturated dephosphorization adsorbent is regenerated by suing a sodium hydroxide solution, and an eluent is condensed and separated through an evaporator. In the invention, an organic polymer microfiltration membrane or an inorganic microfiltration membrane is adopted, and the dephosphorization adsorbent is filled in the ion exchange column; and the bore diameter of the microfiltration membrane is 0.05-10 mum, the porosity of the microfiltration membrane is 30-95%, and a membrane assembly is of a plate type, or a tube type, or a roll type or a hollow fiber type. The invention is used for the direct treatment of the phosphorus sewage or the advanced treatment of the phosphorus sewage treated by a biological method so as to ensure that the phosphorus content of the final produced water is lower than 0.5mg / L and avoid excessive phosphorus discharged into a water body to result in eutrophication, and meanwhile, the ion exchange eluent containing high-content phosphorus is further condensed and separated to achieve the purpose of recycling the sewage.

Description

technical field [0001] The invention relates to a method for removing phosphorus in sewage. Background technique [0002] In recent years, with the discharge of excessive nutrients in urban domestic sewage and industrial wastewater into natural water bodies, the problem of eutrophication in water bodies has become more and more serious, and has become a worldwide water environment problem. Phosphorus is one of the main substances that lead to eutrophication of water bodies. It is generally believed that when the concentration of total phosphorus is greater than 0.02 mg / L, eutrophication of water bodies may occur. At present, biological methods and chemical precipitation methods are mainly used to control phosphorus pollution, but both have certain defects. The biological method is easily affected by external factors, and the phosphorus removal effect is unstable. When the phosphorus content in the influent is high, the phosphorus content in the effluent often exceeds the st...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F1/42C02F1/44
Inventor 廖志民袁志华周佳琳熊建中曹解军杨圣云王鹏
Owner JIANGXI JDL ENVIRONMENTAL PROTECTION CO LTD
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