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Method for treating and recycling waste water of steel plants

A technology for wastewater and steel mills, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of steel mill wastewater that cannot reuse circulating water and cannot handle high organic matter , Can not deal with high hardness or high organic matter steel factory wastewater and other problems, to achieve the effect of alleviating water shortage, protecting the environment and saving water resources

Active Publication Date: 2011-06-08
CHINA NORTH ENERGY CONSERVATION & ENVIRONMENT PROTECTION
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Problems solved by technology

[0011] The purpose of the present invention is to solve the problem that the prior art cannot handle steel mill wastewater with high hardness or high organic matter and steel mill wastewater with high organic matter, and cannot be reused for circulating water, and proposes a method for treating steel mill wastewater and recycling methods

Method used

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  • Method for treating and recycling waste water of steel plants

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Embodiment

[0032] A method for treating wastewater from a steel mill and recycling it, the specific steps are:

[0033] 1) The wastewater from the steel mill passes through the grille sump, in which a mechanical grille is installed to remove bulky substances and some suspended solids with larger particle sizes in the wastewater;

[0034] 2) The submersible sewage pump lifts the waste water treated by the grid sump to the grit settling grease trap, and the grit settling grease trap is equipped with scraping mud and slag equipment to remove the silt and oil scum in the waste water. Effectively reduce sedimentation debris and floating oil substances in wastewater;

[0035] 3) The wastewater treated by the grit-set grease trap enters the regulating tank to adjust the water quality and water quantity, and then is quantitatively lifted by the pump to the vortex reactor added with lime;

[0036] 4) The wastewater treated by the vortex reactor enters the mechanically accelerated clarifier, and ...

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Abstract

The invention relates to a method for treating and recycling waste water of steel plants, which belongs to sewage treating and recycling technology field. The method comprises the steps that: the waste water of the steel plants flows through a grating collecting pit; the waste water treated from the grating collecting pit is lifted to a sand settling grease trap by a submersible sewage pump; the waste water treated from the sand settling grease trap flows into an equalizing tank to adjust water quality and water amount, and then is quantificationally lifted into an eddy current reactor containing lime by the pump; the waste water treated from the eddy current reactor flows into a machinery acceleration clarification pool, then flows into an MSBR system and an intermediate pool in sequence, afterwards is driven into a precision filter by a filtering pump to remove suspension; the filtered water is sufficiently contacted with ozone for ozone disinfection; the disinfected waste water flows into a reuse pool and is driven to each reuse water point; and thus the whole process of treating and recycling the waste water of the steel plants is achieved. The invention has the advantages of high temperature backwater system for water supplement, all for production, realization of waste water free-discharging, environmental protection and water resource conservation.

Description

technical field [0001] The invention relates to a method for treating and recycling wastewater from a steel mill, and belongs to the technical field of wastewater treatment and recycling. Background technique [0002] According to the output of small-scale steel mills in the country, the output is 2 million tons per year, and the fresh water consumption per ton of steel is 5m 3 / t index is calculated, and the steel mill needs at least 10 million tons of fresh water per year (a total of 28,000 m 3 / d), excluding consumption and evaporation, 6500m of production wastewater needs to be discharged 3 / d, plus domestic drainage in the factory area, the total drainage is nearly 7000m 3 / d. [0003] At present, the main process of steel mill wastewater treatment at home and abroad is coagulation and sedimentation. After treatment, part of the water is mainly reused in the slag flushing process, and part of it is discharged outside. The reuse rate is not high and energy is wasted. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 崔剑孟宪礼楚素珍姜鑫王拥宪韩德宝
Owner CHINA NORTH ENERGY CONSERVATION & ENVIRONMENT PROTECTION
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