A kind of processing method of sodium sulfate wastewater

Abstract

The invention discloses a processing method of sodium sulfate wastewater. The processing method comprises the following steps: adding a chemical precipitator into the sodium sulfate wastewater, and filtering reaction liquid, so as to obtain sulfate precipitates and a sodium dihydrogen phosphate solution; adding zinc-containing substances into the sodium dihydrogen phosphate solution, reacting for 2-24 hours, and filtering the reaction liquid, so as to obtain sodium zinc phosphate precipitates and filter liquid. According to the processing method, the sulfate precipitates and the high-additional-value sodium zinc phosphate can be obtained, and the recovery rates of sulfate ions and sodium ions can reach above to 99.3%.

Description

technical field

[0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment method for sodium sulfate waste water. Background technique

[0002] Sodium sulfate-containing wastewater is a common source of pollution in many industries. If it is discharged directly into the natural environment without purification treatment, it will cause the salinity of the water body and soil to increase, destroy the soil structure, and cause soil compaction, which is not conducive to animals and plants. growth and pollute the environment. At present, there are roughly two treatment methods for sodium sulfate wastewater: one is to add lime water to generate calcium sulfate precipitation and sodium hydroxide solution; the other is to concentrate and crystallize it to extract sodium sulfate. Obviously, these two methods can only obtain industrial products with low added value; if you want to prepare dry products, the energy consumption is very h...