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

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...

AI Technical Summary

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

Images