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Embedded biological pre-oxidization aerated filter advanced-treatment method

A biological aerated filter and advanced treatment technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of short contact time between ozone and wastewater, short flow, difficult Realization and other issues

Active Publication Date: 2014-11-19
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patented technology has some obvious defects, such as (1) the contact time between ozone and wastewater is short, and the oxidation reaction process limited by the rate is difficult to realize. (3) The way of water in and out of the biofilter is from the top to the top, and the water quality of the effluent is relatively poor compared with the bottom in and the top out, and the top in and the bottom out, and it is easy to form a short flow, and some sewage is directly discharged without treatment

Method used

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  • Embedded biological pre-oxidization aerated filter advanced-treatment method

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Embodiment 1

[0023] The circulating cooling water plant of a refining and chemical company in Heilongjiang has a daily sewage discharge volume of 720m 3 / d, the concentration ratio is controlled at about 5. The sewage water quality is poor, unable to meet the company's COD<60mg / L discharge requirements. The BOAF method of the present invention (shown in Figure-1 of the accompanying drawings) was used to carry out advanced treatment of the circulating water sewage of the circulating cooling water field, and a 10L / h field test was carried out. Under the lifting effect of ozonated air, the wastewater is circulated in the biochemical zone and the oxidation zone, with a reflux rate of 100L / h and a reflux ratio of 10. The hydraulic retention time of the wastewater in the biochemical zone is 6h, the hydraulic retention time of the reflux water in the diversion zone is 1min, the hydraulic retention time in the lifting zone is 10s, and the hydraulic retention time in the oxidation zone is 5min; th...

Embodiment 2

[0026] Acrylonitrile wastewater from a chemical plant in Liaoning, with a daily treatment capacity of 2000m 3 / d, currently using three-stage biochemical treatment technology for treatment. Due to the certain toxicity of acrylonitrile wastewater, the effluent quality of the existing treatment system is difficult to meet the local standard of Liaoning Province "Integrated Wastewater Discharge Standard" (DB21 / 1627-2008). The company intends to carry out advanced treatment of the existing biochemical effluent. The BOAF method of the present invention (shown in Figure-1 of the accompanying drawing) is used for advanced treatment of acrylonitrile biochemical effluent. Under the lifting effect of ozonated air, the wastewater is circulated in the biochemical zone and the oxidation zone, and the reflux ratio is 6. The hydraulic retention time of the wastewater in the biochemical zone is 6h, the hydraulic retention time of the return water in the diversion zone is 1.5min, the hydraul...

Embodiment 3

[0029] Refining wastewater from a refinery company in Guangdong, with a daily discharge of 7000m 3 / d, currently using oil separation-air flotation-two-stage A / O treatment technology, the COD and ammonia nitrogen in the effluent water are slightly high, which is difficult to meet the discharge requirements. Adopt BOAF method of the present invention (attachment figure 1 shown) to carry out small-scale research on biochemical effluent. Under the lifting effect of ozonated air, the wastewater circulates in the biochemical zone and the oxidation zone, the reflux ratio is 3 (the ratio of the reflux flow to the influent flow), the hydraulic retention time of the wastewater in the biochemical zone is 4h, and the reflux water is diverted The hydraulic retention time in the zone is 2min, the hydraulic retention time in the lifting zone is 30s, and the hydraulic retention time in the oxidation zone is 20min; the dosage of ozone in wastewater is 15mg / L.

[0030] The average COD of the...

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Abstract

The invention relates to an embedded biological pre-oxidization aerated filter advanced-treatment method, which is characterized in that an ozone aeration upgrading technology is combined with a BAF (Biological Aerated Filter), and feed water and refluxed fluid from an oxidization area enter a biochemical treatment area of the BAF through a water distribution area to finish the biological degradation of pollutants such as biochemically-treatable organic matters, ammonia nitrogen and nitrate nitrogen; a part of supernatant obtained by biochemical treatment is drained from a device as effluent; the other supernatant automatically flows into a refluxing area through a flow guide tube, and enters the oxidization area after being upgraded by ozonized air in an upgrading area, and the effluent in the oxidization area and the feed water enter the water distribution area of the BAF, and enter the biochemical treatment area of the BAF for biochemical reaction after being mixed, wherein the oxidization area is filled with an active catalyst.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sewage treatment, and relates to a sewage treatment technology, in particular to an advanced treatment method of an embedded pre-oxidation biological aerated filter (BOAF). Through the combination of biological aerated filter (BAF) technology and ozone catalytic oxidation technology, the pollutants in water can be removed more thoroughly. Background technique [0002] With the increasingly stringent national environmental protection policies, the task of reducing industrial wastewater is becoming more and more serious. Ozone oxidation-biological aerated filter (BAF) technology has been widely used in the field of wastewater treatment. Ozone has a high redox potential, can oxidize unsaturated bonds, break the long chain of organic matter, has good decolorization and improves the biodegradability of organic matter; BAF integrates biological oxidation and filtration interception, an...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 陆彩霞邵强孙玉凤钱光磊张艳芳滕厚开陈爱民
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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