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Advanced treatment technology for comprehensive wastewater of iron and steel enterprises

A comprehensive wastewater and advanced treatment technology, applied in metallurgical wastewater treatment, adsorption water/sewage treatment, water/sewage multi-stage treatment, etc. Chemical cleaning cycle, the effect of reducing the cost of recycling

Inactive Publication Date: 2013-07-31
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current popular reverse osmosis pretreatment process mainly focuses on reducing turbidity, without considering the adverse effects of oil content and COD index on the reverse osmosis membrane, and there are many problems

Method used

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  • Advanced treatment technology for comprehensive wastewater of iron and steel enterprises
  • Advanced treatment technology for comprehensive wastewater of iron and steel enterprises
  • Advanced treatment technology for comprehensive wastewater of iron and steel enterprises

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0026]Pass the reused wastewater through the pressure pipeline (according to the oil content index of the reused wastewater in the pipeline, it is judged not to add or add flocculant for micro-flocculation) from the filter water inlet 6 through the pipeline to the top of the filter material area of ​​the tank body 1, and then After filtering through the coarse filter layer 5, the upper fine filter layer 4.1, the lower fine filter layer 4.2, and the supporting area to remove oil and turbidity, it flows out through the filter outlet 7 below the water distribution area 2; the reused waste water is filtered through multi-media After filter pretreatment, ultrafiltration and reverse osmosis treatment are carried out. In addition, under normal circumstances, the multi-media filter needs to be backwashed with air and water every 24 hours. The backwashing process is: first perform air washing for 3-5 minutes, then perform water-air mixed washing for 8-10 minutes, and finally wash with w...

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Abstract

The invention discloses an advanced treatment technology for comprehensive wastewater of iron and steel enterprises, and solves the problems of easy reverse osmosis membrane pollution by organic substances, easy obstruction, difficult cleaning and the like common in existing ultrafiltration and reverse osmosis double-membrane combined technology. The technology first conducts pretreatment to reused wastewater, then carries out subsequent ultrafiltration and reverse osmosis treatments, and finally discharges the wastewater. In the pretreatment process, the wastewater is delivered to a multi-medium filter through a pipeline for filtering so as to reduce the turbidity and oil content of the wastewater. The technology of the invention has the advantages of simple process, simple and convenient operation, stable system, long membrane cleaning cycle, as well as low investment and operation cost.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a comprehensive wastewater advanced treatment process for iron and steel enterprises. Background technique [0002] Since iron and steel enterprises have process units such as continuous casting, hot rolling, and cold rolling, the mixed wastewater discharged through the above units has the characteristics of large fluctuations in water quality, trace oil content and high dissolved solid content. ) The oil content of reused wastewater is still 0.8-4mg / L, and the COD is 15-40mg / L. For the desalination treatment of this kind of wastewater, domestic iron and steel enterprises have engineering examples of using "ultrafiltration + reverse osmosis" dual-membrane combination. In the pretreatment process, there are common problems that the reverse osmosis membrane is prone to organic pollution, easy to block, and difficult to clean. The main reason is that the wastewater contains trace a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C02F1/28C02F1/44C02F1/52C02F103/16
Inventor 舒纯吴晓晖罗聪章北平肖兰芳李建梅
Owner 武钢集团有限公司
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