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Method for treating coking wastewater

A technology of coking wastewater and membrane method, applied in the field of environmental protection and resource utilization, can solve the problems of low added value, improve the removal effect, save the cost of adding and dissolving equipment, and reduce the investment and operation cost.

Active Publication Date: 2009-09-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of valuable elements in blast furnace slag and steel slag have not been fully utilized, and generally speaking, the added value of its utilization is relatively low

Method used

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  • Method for treating coking wastewater
  • Method for treating coking wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0037] All the fillers are made of blast furnace slag with a particle size range of 5-10mm. The biological aerated filter is used, and the hydraulic retention time of the system is 50h, to treat the coking wastewater of a coking plant. Influent water quality of coking wastewater pH8.44~8.67, COD1028~1560mg / L, NH 3 -N145~202mg / L, F - 43~65mg / L. After being treated by the blast furnace slag reactor, the effluent quality reaches: pH6.68~7.05, COD156~237mg / L, NH 3 -N0~3.2mg / L, F - 9.5~16.7mg / L. Effluent pH and NH 3 -N can meet the first-level discharge standard of "Integrated Wastewater Discharge Standard" (GB8978-1996), F in the effluent - It can meet the secondary emission standards of low-fluorine areas.

Embodiment 2

[0039] The ratio of blast furnace slag and steel slag is 90%:10%. The biological aerated filter is used, the lower part of the reactor is filled with 50% mixed slag with a particle size of 10-20mm, and the upper part is filled with 50% mixed slag with a particle size of 5-10mm. The hydraulic retention time of the system is 60h, and the coking wastewater of a coking plant is treated. . Influent water quality: pH8.08~9.26, COD1488~2570mg / L, NH 3 -N137~375mg / L, F - 44~81mg / L. After being treated in the blast furnace slag and steel slag mixed packing reactor, the effluent water quality reaches: pH6.75~7.42, COD232~338mg / L, NH 3 -N0~5.6mg / L, F-12.5~18.3mg / L. Effluent pH and NH 3 -N can meet the first-level discharge standard of "Integrated Wastewater Discharge Standard" (GB8978-1996), F in the effluent - It can meet the secondary emission standards of low-fluorine areas.

Embodiment 3

[0041] The ratio of blast furnace slag and steel slag is 80%: 20%. The biological aerated filter is used, the lower part of the reactor is filled with 40% mixed slag with a particle size of 10-20mm, the middle part is filled with 40% mixed slag with a particle size of 5-10mm, and the upper part is filled with 20% mixed slag with a particle size of 3-5mm. The residence time is 65h, and a synthetic coking wastewater is treated. Influent water quality: pH8.05~8.20, COD1480~1550mg / L, NH 3 -N436~458mg / L, F - 75~83mg / L. After being treated in the blast furnace slag and steel slag mixed packing reactor, the effluent water quality reaches: pH7.05~7.48, COD105~139mg / L, NH 3 -N0~6.2mg / L, F - 9.8~15.6mg / L. Effluent pH and NH 3 -N can meet the first-level discharge standard of "Integrated Wastewater Discharge Standard" (GB8978-1996), F in the effluent - It can meet the secondary emission standards of low-fluorine areas.

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Abstract

The invention provides a method for treating coking wastewater, which comprises the following steps: (1) sieving blast furnace slag and steel slag; (2) filling the sieved blast furnace slag and steel slag into a bioreactor, with the blast furnace slag accounting for 0 to 100 percent; (3) starting the acclimatization of the bioreactor; and (4) introducing the coking wastewater into an aerobic bioreactor. The method achieves the aim of resourcefully utilizing the blast furnace slag and the steel slag when treating the coking wastewater and reducing wastewater treating cost.

Description

technical field [0001] The invention belongs to the field of environmental protection and recycling, in particular, the invention relates to the treatment of coking waste water and the secondary utilization of blast furnace slag and steel slag. Background technique [0002] The composition of coking wastewater is complex and changeable, COD, NH 3 -The concentration of N is high, the organic components are complex, and it contains a large amount of organic pollutants such as phenols, biphenyls, pyridine, indole and quinoline, as well as toxic and harmful substances such as cyanide, inorganic fluoride ions and ammonia nitrogen, and the pollutants have high chromaticity. Moreover, it exists in the form of true solution and quasi-colloid in water, and its properties are stable. COD and chroma in wastewater are difficult to remove, so the treatment of coking wastewater has always been a major problem in the field of wastewater treatment at home and abroad. [0003] At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02C02F3/10C02F1/66C02F1/52
CPCY02W10/10
Inventor 侯红娟董晓丹李恩超黎洁
Owner BAOSHAN IRON & STEEL CO LTD
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