Method of reclaiming and using high-pollution low-concentration waste acid

Abstract

The invention discloses a high-pollution low-density recycling and utilizing method of waste acid, which is characterized by the following: adding the waste water with sulphuric acid into inorganic salt MX to react with sulphuric acid after multi-effective concentration and filtering to remove impurity; generating with gas and acid composite salt; utilizing the acid composite salt or refining and separating through neutralizing, removing impurity and decoloring. The X in the halogenated salt is Cl-or Br-and M is cation to form soluble sulfate with sulfuric radical. The invention modifies and improves the disposing method to recycle and utilize low-density waste acid, which saves waste water disposing cost to provide a new resource integrated concept.

Description

technical field [0001] The invention relates to waste water treatment in the field of environmental protection, in particular to a comprehensive treatment and recycling method for high-pollution and low-concentration waste acid. Background technique [0002] Usually low-concentration waste sulfuric acid is treated by the following methods. 1. Adopt the method of cleaning and diverting, and use lime to neutralize and adsorb the mother liquor, but it will produce a large amount of secondary pollution solid waste. 2. The iron-carbon degradation and biological treatment method of mixing mother liquor and lotion is used. The disadvantage is that it consumes a lot of iron powder and high-cost chemical reagents. 3. Adopt other methods: such as ozone method, electrolysis method and strong oxidant method, there are also problems such as large energy consumption, high cost, and large waste of manpower. [0003] The applicant's prior Chinese invention patent application 200610049658....

AI Technical Summary

Problems solved by technology

1. Adopt the method of cleaning and diverting, and use lime to neutralize and adsorb the mother liquor, but it will produce a large amount of secondary pollution solid waste

2. The iron-carbon degradation and biological treatment method of mixing mother liquor and lotion is used. The disadvantage is that it consumes a lot of iron powder and high-cost chemical reagents

3. Using other methods: such as ozone method, electrolysis method and strong oxidant method, there are also problems such as large energy consumption, high cost, and large waste of manpower.

[0004] However, there is still room for further improvement in this inventive method, and the utilization of follow-up products also needs to be further developed.

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