Device for producing ammonium sulfate from dye sulfuric acid wastewater

Abstract

The invention relates to the technical field of dye wastewater treatment, in particular to a device for producing ammonium sulfate from dye sulfuric acid wastewater, which comprises a first decolorization system, a neutralization system, a second decolorization system and a fine filtration system. The neutralization system comprises a neutralization feed pump, a neutralization pipeline reactor, aneutralization buffer tank, a neutralization filter press pump, a neutralization filter press and a neutralization filtrate tank which are connected in sequence, and initial mother liquor water is decolored by the first decolorization system and then conveyed into the neutralization pipeline reactor through the neutralization feed pump to be neutralized with liquid ammonia in the neutralization pipeline reactor. The neutralization filtrate tank is connected with the second decolorization system, the second decolorization system is connected with the fine filtration system, the fine filtrationsystem is connected with a PH back-regulation tank and is mixed with waste acid in the PH back-regulation tank, and the PH back-regulation tank is connected with an ammonium sulfate solution tank through an ammonium sulfate solution pump. Various indexes such as whiteness and content of an ammonium sulfate finished product produced by the sulfuric acid wastewater treated by the method are excellent, and industrial production and use requirements of other industries are completely met.

Description

technical field [0001] The invention relates to the technical field of dye wastewater treatment, in particular to a device for producing ammonium sulfate from dye sulfuric acid wastewater. Background technique [0002] It is well known that dye sulfuric acid wastewater has the characteristics of strong acidity, complex composition, many impurities, often containing a variety of organic impurities, large discharge volume, and refractory degradation. If it is discharged directly without treatment, it will bring serious harm to the environment. The dye industry traditionally uses lime to neutralize dye sulfuric acid wastewater, but this will produce a large amount of calcium sulfate waste residue containing organic matter, and the subsequent harmless treatment of the waste residue still requires a high cost. [0003] At present, the ideal treatment method for dye sulfuric acid wastewater is to combine wastewater treatment with the production of ammonium sulfate to realize the r...

AI Technical Summary

Problems solved by technology

The activated carbon used in the pretreatment part usually contains iron and iron oxides due to the manufacturing process of activated carbon, and sulfuric acid wastewater reacts with iron and iron oxides during the decolorization process to generate a large number of iron ions. If the neutralization process of adding liquid ammonia cannot precipitate and precipitate iron ions, a large amount of flocs will be produced, which will easily block the precision filter and bring difficulties to the subsequent evaporation, concentration and crystallization

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