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Technology for treating and reusing sewerages of industrial circulating water

A technology for industrial circulating water and sewage, which is applied in the direction of adsorption water/sewage treatment, light water/sewage treatment, oxidized water/sewage treatment, etc. It can solve the problem of large cooling water side-flow treatment, acid-base consumption, poor treatment effect, etc. question

Active Publication Date: 2010-01-13
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

Although this method can reduce the amount of sewage discharge, the treatment of the side flow of cooling water is relatively large, which is not economical
At the same time, the ion exchange method needs to frequently regenerate the ion exchange resin, which consumes a lot of acid and alkali, and the operating cost is also high.
[0003] Chinese patent 200610150162.9 discloses "a treatment method for industrial circulating water sewage", which mainly uses a nanofiltration system for reuse after treatment. The interception effect of monovalent salt and small molecular substances is poor. At the same time, under the current high concentration ratio operation of circulating water, the sewage contains more high molecular polymers, and the usual flocculation and sedimentation filtration is less effective in treating such substances. Poor, unable to reduce the organic pollutants in the water body, if they remain in the membrane feed water, it will cause membrane plugging and membrane fouling, thus increasing the operating cost of the enterprise

Method used

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  • Technology for treating and reusing sewerages of industrial circulating water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The water sample is taken from a chemical fertilizer plant that uses natural gas as raw material. The circulating water and sewage are directly passed through the photocatalytic oxidation reactor according to step A. The light source is an ultraviolet lamp system, and the photocatalytic material is 1% ammonium molybdate and 1% nickel nitrate , and 1% cobalt nitrate composite loaded titanium dioxide catalyst. The light source part adopts a multi-stage parallel arrangement. The influent COD concentration dropped from 258mg / L to 38mg / L, and the TOC dropped from 80mg / L to 8mg / L. The discharged water meets the first class a standard of urban sewage treatment plant pollutant discharge (GB 18918-2002).

Embodiment 1 proportion 1

[0017] The photocatalytic material uses ordinary titanium dioxide as a catalyst. The light source part adopts a multi-stage parallel arrangement. The concentration of influent COD dropped from 258mg / L to 163mg / L, and TOC dropped from 80mg / L to 54mg / L. The discharged water cannot meet the first class a standard of urban sewage treatment plant pollutant discharge (GB 18918-2002).

Embodiment 1 proportion 2

[0019] The photocatalytic material uses 0.5% ammonium molybdate supported on titanium dioxide as a catalyst. The light source part adopts a multi-stage parallel arrangement. The concentration of influent COD dropped from 272mg / L to 113mg / L, and TOC dropped from 83mg / L to 26mg / L. The discharged water cannot meet the first class a standard of urban sewage treatment plant pollutant discharge (GB 18918-2002).

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Abstract

The invention relates to a technology for treating and reusing sewerages of industrial circulating water, which is characterized in that a photocatalytic oxidation treatment technology of composite titanium oxide is adopted to treat the sewerages of industrial circulating water, and an inorganic and organic complexation, flocculation and deposition method is adopted to remove colloid, suspended substances, and the like in the sewerages; then the sewerages are treated through a hollow fiber ultrafiltration membrane and a reverse osmosis membrane, and obtained produced water can be reused for a production water and boiler water circulatory system. The technology can remove COD and TOC caused by water treatment agents in the sewerages of the circulating water, the content of the COD after treatment can be reduced to be below 50mg / L from 300mg / L before the treatment, the content of the TOD is reduced to be below 10mg / L from 100mg / L, and drained water can meet Category A and Class 1 under the standard of the discharge standard of pollutants for municipal wastewater treatment plants (GB18918-2002).

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sewage treatment. It involves a treatment and reuse technology of industrial circulating water sewage. It mainly adopts a combined treatment process combining multiple methods, and uses photocatalytic oxidation technology to remove COD caused by polymer water treatment chemicals in circulating water sewage. At the same time, the bacteria and algae substances in it are removed until the discharge reaches the standard, and then the sewage is reused by ultrafiltration and reverse osmosis. Background technique [0002] Chinese patent 03150903.7 discloses "a method for side-stream treatment of industrial circulating cooling water", which mainly performs side-stream treatment of cooling water, and uses a combination of coagulation sedimentation and cation exchange resin treatment technologies to reduce the amount of pollutant discharge. Although this method can reduce the sewage disch...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/32C02F1/72C02F1/52C02F1/28C02F1/44
Inventor 谢陈鑫赵慧陈永生滕厚开陈军
Owner CHINA NAT OFFSHORE OIL CORP
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