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Advanced treatment method for wastewater in iron and steel industry

An advanced treatment, iron and steel industry technology, applied in water/sewage treatment, biological water/sewage treatment, neutralized water/sewage treatment, etc. It can solve the problems of wasting water resources, large amount of sewage and wastewater, and no recovery of concentrated brine. , to achieve the effect of reducing the amount of purchases

Pending Publication Date: 2022-03-18
北京拓凯化工技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Iron and steel enterprises have a large amount of sewage and wastewater treatment. Generally, coagulation-clarification methods are used for pretreatment to remove pollutants in sewage and wastewater to make reclaimed water that can be reused. Advanced treatment of reclaimed water to make desalinated water can increase its reuse value. If Reverse osmosis is used to produce desalinated water for reclaimed water. The recovery rate of desalinated water is generally about 60-80%. Flushing the slag will also waste most of the high-concentration salts

Method used

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  • Advanced treatment method for wastewater in iron and steel industry
  • Advanced treatment method for wastewater in iron and steel industry

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Embodiment 1

[0039] There is a large amount of Ca in the comprehensive sewage and wastewater of an iron and steel enterprise 2+ , Mg 2+ 、Na + , Cl - , SO 4 2- 、HCO 3 - Plasma can be extracted and recycled; at the same time, it contains suspended solids, oil, silicon, phosphorus, iron, manganese, ammonia nitrogen and other substances. The steps of the advanced sewage treatment method are as follows:

[0040] S1, remove suspended solids, oil, silicon, phosphorus, iron, manganese, ammonia nitrogen and other substances through coagulation-clarification-biochemical-filtration-killing and other processes, and use chlorine to sterilize to obtain turbidity 2+ , Mg 2+ 、Na + , Cl - , SO 4 2- It is extracted as a resource, so in the coagulation process, it is not necessary to add some chemicals to remove these ions, but to keep them as much as possible. Detection of Ca in recycled water 2+ The content is 178mg / L, Mg 2+ The content is 46mg / L, Na + content of 137mg / L, Cl- content of 173m...

Embodiment 2

[0058] There is a large amount of Ca in the comprehensive sewage and wastewater of an iron and steel enterprise 2+ , Mg 2+ 、Na + , Cl - , SO 4 2- 、HCO 3 - Plasma can be extracted and recycled; it also contains suspended solids, turbidity, oil, silicon, phosphorus, iron, manganese, ammonia nitrogen, COD, etc. Interference needs to be removed; wastewater treatment is done through the following steps:

[0059] S1, through coagulation-clarification-biochemical-filtration-killing and other processes, suspended solids, turbidity, oil, silicon, phosphorus, iron, manganese, ammonia nitrogen, COD, etc. are removed, and sodium hypochlorite is used to sterilize. Reclaimed water for advanced treatment. Detection of Ca in recycled water 2+ 192mg / L, Mg 2+ 42mg / L, Na + 385mg / L, Cl - 391mg / L, SO 4 2- 765mg / L, HCO 3 - 182mg / L;

[0060] S2, the above-mentioned regenerated water is processed through a multi-stage sodium ion exchanger to remove calcium and magnesium ions to becom...

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Abstract

The invention relates to an advanced treatment method for wastewater in the steel industry, which is used for carrying out advanced treatment on the wastewater in the steel industry and reasonably arranging process equipment on the basis of fully considering the actual requirements of a production process and water production of a steel enterprise to achieve the goal of simultaneously extracting salt from the wastewater and producing water. The method comprises the following steps: respectively extracting macroscopic substances, namely Ca < 2 + >, Mg < 2 + >, Na < + >, Cl <-> and SO4 < 2->, which account for the most proportion in the reclaimed water to prepare corresponding salts which are valuable products to be utilized; a sodium chloride solution regenerant used by the sodium ion exchanger is replaced by a separated, purified and concentrated sodium chloride solution, and magnesium hydroxide used for flue gas desulfurization or steel rolling pickling wastewater treatment is extracted from reclaimed water; softened water, demineralized water and ultrapure water used by the thermal boiler can be sufficiently supplied according to process requirements.

Description

technical field [0001] The invention relates to the technical field of industrial sewage and wastewater treatment, in particular to a method for the advanced treatment of sewage and wastewater in the iron and steel industry. Aiming at the pollutants and macro elements in the sewage and wastewater of the iron and steel industry and the production characteristics of the iron and steel industry, a complete set of water treatment processes and equipment is configured to achieve the removal of Harmful pollutants in sewage and wastewater, extracting macro elements in sewage and wastewater into salts that can be comprehensively utilized, and preparing sewage and wastewater into desalinated water for reuse, better serving production. Background technique [0002] Iron and steel enterprises have a large amount of sewage and wastewater treatment. Generally, coagulation-clarification methods are used for pretreatment to remove pollutants in sewage and wastewater to make reclaimed water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/14C02F101/16C02F101/30
CPCC02F9/00C02F1/5236C02F1/56C02F1/001C02F2001/007C02F1/42C02F1/441C02F1/442C02F1/041C02F1/444C02F3/1268C02F3/02C02F2101/30C02F2101/16C02F2101/163C02F1/66C02F2101/14Y02A20/131
Inventor 史玉
Owner 北京拓凯化工技术有限公司