Coking wastewater strong brine recycling method

A technology for coking wastewater and concentrated brine, applied in the field of water treatment, can solve the problems of no coking wastewater reverse osmosis concentrated brine treatment and reuse reports, etc., and achieve good social and environmental benefits.

Active Publication Date: 2016-01-13
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Check the existing patents and literature, there is no report on the treatment and reuse of coking wastewater reverse osmosis concentrated brine

Method used

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  • Coking wastewater strong brine recycling method

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Embodiment Construction

[0040] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples.

[0041] The invention provides a method for reusing concentrated brine of coking wastewater, comprising the following steps:

[0042] (1) Organic matter pretreatment

[0043] First use O 3 / H 2 o 2 Oxidize the concentrated brine, the reaction time is 10-20min, the dosage of O3 is 5-30mg / L, the H 2 o 2 The dosage is 30~100mg / L, and the removal rate of COD after oxidation is 20~40%. At the same time, B / C(BOD 5 / COD) increased from 0.05 to 0.4~0.6; the chemically oxidized effluent enters the biological contact oxidation reactor for further treatment, the hydraulic retention time of the biological contact oxidation is 2~10h, and the effluent COD is below 80mg / L.

[0044] (2) filter

[0045] The effluent from the bioreactor enters the ...

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Abstract

The invention provides a coking wastewater strong brine recycling method. The coking wastewater strong brine recycling method comprises following steps: organic pretreatment, wherein coking wastewater strong brine is subjected to physicochemical treatment and biological treatment so as to remove organic matters in coking wastewater; filtering, wherein particle matters in the coking wastewater is removed via filtering; scale inhibition pretreatment, wherein pH value of the coking wastewater strong brine is adjusted to 5 to 7; and membrane distillation treatment and evaporative crystallization treatment. According to the coking wastewater strong brine recycling method, strong brine obtained via cooking wastewater reverse osmosis is subjected to membrane distillation and evaporative crystallization so as to obtain qualified water, the obtained qualified water is recycled to production systems, inorganic salts in a concentrated solution are changed into crystals, and zero liquid discharge of cooking wastewater is realized; the coking wastewater strong brine recycling method possesses both economic and environmental protection effects, and excellent social benefits and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for reusing concentrated brine from coking wastewater. Background technique [0002] The treatment of coking wastewater has always been a major problem for iron and steel enterprises. The wastewater quality fluctuates greatly and has complex components. It contains dozens or even hundreds of organic and inorganic pollutants. The organic pollutants mainly include phenols, monocyclic and polycyclic aromatics. Group compounds and heterocyclic compounds containing nitrogen, oxygen, sulfur, etc.; inorganic pollutants mainly include ammonia nitrogen, thiocyanide, sulfide, and cyanide; and its biodegradability is poor, containing a large amount of refractory biodegradable substances. Some refractory metabolites will also be produced. At present, most enterprises adopt the combination of biological treatment and pre-physical and chemical treatment. The "Acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 侯红娟尹婷婷张宜莓金学文李恩超任巍裘慕贤
Owner BAOSHAN IRON & STEEL CO LTD
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