Sodium sulfate wastewater resource utilization treatment system

Abstract

The invention discloses a sodium sulfate wastewater resource utilization treatment system. The system comprises an evaporation device, a filtering device I, a freezing crystallization device and a filtering device II. The evaporation device comprises a multi-effect evaporation apparatus, a single-effect evaporation apparatus and a mechanical vapor recompression evaporation crystallization apparatus, preferably a mechanical vapor recompression evaporation crystallization device; the filtering device I comprises a vacuum filtering unit, a centrifugal filtering unit and a filter pressing unit, preferably a centrifugal filtering device; the freezing crystallization device is composed of a freezing unit, a freezing crystallizer and the like; the filtering device II comprises a vacuum filteringapparatus, a centrifugal filtering apparatus, a filter pressing apparatus and the like, preferably a centrifugal filtering device. The sodium sulfate wastewater resource utilization treatment system consists of the evaporation device, the filtering device I, the freezing crystallization device, the filtering device II, etc., can makes full use of sodium sulfate wastewater, reduces the discharge ofwastewater, avoids environmental pollution, and realizes secondary utilization of sodium sulfate wastewater.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a sodium sulfate wastewater resource utilization treatment system. Background technique [0002] In industries such as desulfurization, chemical metallurgy, and environmental protection, a large amount of sodium sulfate wastewater will be produced. After the wastewater containing sodium sulfate is discharged into the water body, it will cause serious pollution, lead to acidification of the water body, lower pH, and harm aquatic organisms. At present, domestic treatment of sodium sulfate There are three main methods for wastewater: sodium sulfate-containing wastewater produces low-concentration sodium hydroxide, but due to high energy consumption and poor product quality in this method, hydrogen sulfide gas is produced during the process to pollute the environment, and only about 30% of sodium sulfate is converted into hydrogen Sodium oxide; sodium sulfate-containing w...

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Problems solved by technology

[0002] In industries such as desulfurization, chemical metallurgy, and environmental protection, a large amount of sodium sulfate wastewater will be produced. After the wastewater containing sodium sulfate is discharged into the water body, it will cause serious pollution, lead to acidification of the water body, lower pH, and harm aquatic organisms. At present, domestic treatment of sodium sulfate There are three main methods for wastewater: sodium sulfate-containing wastewater produces low-concentration sodium hydroxide, but due to high energy consumption and poor product quality in this method, hydrogen sulfide gas is produced during the process to pollute the environment, and only about 30% of sodium sulfate is converted into hydrogen Sodium oxide; sodium sulfate-containing wastewater produces chlorine-free potassium fertilizer. Due to the severe corrosion of the equipment by chloride ions in the solution under high temperature conditions, the service life of the equipment is short and the production cost is high; the crystallization of sodium sulfate-containing wastewater produces sodium sulfate decahydrate. Since the temperature of the heat source is too high to be in contact with the container in the atmospheric pressure evaporation process, while the reduced pressure evaporation requires high equipment and high energy consumption, thereby increasing the cost, so the above three methods cannot be widely used. Therefore, we propose A Sodium Sulfate Wastewater Resource Utilization Treatment System

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