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Zero-discharge treatment process for industrial wastewater of iron and steel plant

A technology for treating process and industrial wastewater, applied in the field of water supply and drainage in the iron and steel industry, can solve the problems of receiving water pollution, and achieve the effect of zero discharge

Inactive Publication Date: 2010-04-21
CISDI ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no effective treatment method for this type of wastewater, and it is basically discharged directly, causing great pollution to the receiving water body

Method used

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  • Zero-discharge treatment process for industrial wastewater of iron and steel plant
  • Zero-discharge treatment process for industrial wastewater of iron and steel plant
  • Zero-discharge treatment process for industrial wastewater of iron and steel plant

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Experimental program
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specific Embodiment

[0015] A planned 10-million-ton steel plant that has reached the international advanced level is built near the sea. Since there are national key marine aquaculture bases and tourist resorts nearby, it is required to achieve zero discharge of steel industry wastewater.

[0016] Main design parameters:

[0017] New water consumption per ton of steel: 3.9 tons of water / ton of steel

[0018] New water production scale: 160,000 tons / day

[0019] The amount of industrial wastewater in the whole plant: 25,000 tons / day

[0020] Industrial wastewater advanced treatment capacity: 10,000 tons / day

[0021] Through the water balance analysis software of the whole plant, analyze the water consumption per ton of product and per ton of steel for each production unit included in the iron and steel plant, and determine the international advanced new water consumption per ton of steel index of 3.9 tons of water / ton of steel. According to the characteristics of good raw water quality, the ave...

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Abstract

The invention belongs to the field of water supply and discharge in the iron and steel industry, and in particular relates to a zero-discharge treatment process for industrial wastewater of an iron and steel industry. The industrial wastewater process is characterized in that: strong brine is subjected to advanced treatment by strong brine treatment process. The strong brine treatment process comprises the following steps that: the strong brine is treated by adopting ion exchange resin to remove Ca2+, Si2+ and other ions which have great influence on film operation, and is subjected to secondary reverse osmosis treatment by adopting a seawater film or a bitter film to furthest reduce the strong brine, and is treated by adopting solidification or low-temperature multiple effect evaporation crystallization. The process saves investment, is convenient for implementation, has clear treatment effect, and can realize zero discharge of the industrial wastewater of the iron and steel plant through source control, strengthening treatment, strong brine reduction, evaporation crystallization and other technology and measures. The process can be widely applied to industrial wastewater treatment for domestic iron and steel enterprises.

Description

technical field [0001] The invention belongs to the field of water supply and drainage in the iron and steel industry, and in particular relates to a process for zero-discharge treatment of industrial wastewater in iron and steel plants. technical background [0002] As a large urban water user, the steel plant's circulating cooling water system will generate about 2-5% of the total circulating water volume of sewage; at the same time, each production workshop will also produce a small amount of oily wastewater, weak acid-base wastewater and flushing wastewater. The above-mentioned types of wastewater are collected as the industrial wastewater of the whole plant and transported to the central water treatment plant through the wastewater drainage pipe network for centralized treatment before reuse or discharge. [0003] Industrial wastewater treatment process see figure 1 : Industrial wastewater enters the regulating tank, from which it enters the high-efficiency air flotati...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/42C02F1/44C02F1/04C02F103/16
Inventor 张亮罗金华刘惠姜剑苏定江
Owner CISDI ENG CO LTD
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