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Zero-discharge treatment method for high-concentration brine in metallurgical industry

A treatment method, concentrated brine technology, applied in metallurgical wastewater treatment, water/sewage treatment, heating water/sewage treatment, etc., can solve the problems of high impurity content in crystalline salt, inability to produce economic benefits, reverse osmosis membrane pollution, etc., to achieve Guaranteed purity, realized resource utilization, and considerable economic benefits

Pending Publication Date: 2021-01-05
水发海若环境技术有限公司
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Problems solved by technology

[0003] The zero-discharge technology of industrial wastewater currently mainly adopts membrane concentration + evaporation crystallization technology, lacks pre-treatment, serious pollution of reverse osmosis membrane, fast replacement frequency, high content of impurities in crystalline salt, cannot produce economic benefits, causes a lot of waste of resources and environmental pollution

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  • Zero-discharge treatment method for high-concentration brine in metallurgical industry

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Embodiment Construction

[0023]The zero-discharge method for high-salt, high-hardness and high-polluting wastewater in the metallurgical industry of the present invention specifically includes the following steps:

[0024](1) The high-concentration brine first enters the high-efficiency clarification tank, where lime milk is added to maintain the pH of the wastewater at about 10.5 to remove the temporary hardness in the water, sodium carbonate is added to remove the permanent hardness in the water, and then the flocculant PAC, Coagulant PAM precipitates to remove suspended solids in water; clarified water enters the ozone contact oxidation tank;

[0025](2) Hydroxyl radicals generated after ozone decomposition have strong oxidizing properties. After the water produced in the high-efficiency clarifier enters the ozone contact oxidation tank, under the strong oxidation of hydroxyl radicals, the water's refractory pollutants are degraded into low biodegradability. Molecular organic matter directly decomposes small m...

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Abstract

The invention relates to a zero-discharge treatment method for high-concentration brine in the metallurgical industry, which comprises the following steps: filtering high-concentration brine, carryingout reverse osmosis treatment, carrying out evaporative crystallization, and carrying out pretreatment before the filtering step, and the pretreatment step comprises the following steps: enabling thehigh-concentration brine to enter an efficient clarification tank to remove temporary hardness and permanent hardness in the water, removing suspended matters in the water, enabling clarified water to enter an ozone contact oxidation pond for catalytic ozonation, enabling effluent of the ozone contact oxidation pond to enter a subsequent biological aerated filter for treatment. Aiming at high-salinity, high-hardness and high-pollution wastewater, efficient clarification, ozone contact oxidation, a biological aerated filter, a multi-medium filtration technology, an ultrafiltration technology and a weak acid cation bed technology are adopted for removing hardness of the wastewater and removing pollutants and heavy metal ions in the wastewater; wastewater is concentrated by adopting a primary and secondary reverse osmosis technology, and ultra-strong brine is subjected to nanofiltration salt separation and evaporative crystallization, so that zero discharge of wastewater in the metallurgical industry is truly realized.

Description

Technical field[0001]The invention relates to the technical field of industrial wastewater treatment, in particular to a zero discharge method for metallurgical industry concentrated brine with high hardness, high salt and high pollutant wastewater.Background technique[0002]The amount of water discharged from the production process of the metallurgical industry is huge, which is a large industrial wastewater discharger in my country, and the unit water consumption is still higher than the level of foreign enterprises. It is characterized by a large amount of water, more types, and more complex and changeable water quality. To further reduce water consumption, improve corporate water recycling rate, and strengthen the comprehensive treatment and reuse of wastewater in the metallurgical industry is one of the keys to the sustainable development of the metallurgical industry in my country today. More importantly, it can turn waste into treasure and achieve considerable Economic benefit...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/20C02F101/30C02F103/16
CPCC02F9/00C02F1/001C02F1/04C02F1/441C02F1/444C02F2101/30C02F2101/20C02F2001/425C02F1/5236C02F1/56C02F1/66C02F1/725C02F1/78C02F3/02C02F1/442C02F2103/16
Inventor 刘广侯书芳杜战鹏张冠文于清刚
Owner 水发海若环境技术有限公司
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