Sodium sulfate wastewater treatment process

A treatment process, sodium sulfate technology, applied in heating water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the pressure of increasing treatment cost and environment, high energy consumption cost, Deal with problems such as high cost, and achieve the effects of low power of supporting power equipment, reduced processing cost, and high flow rate

Active Publication Date: 2017-03-22
JIANGSU MYANDE ENERGY SAVING EVAPORATION EQUIP CO LTD
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AI Technical Summary

Problems solved by technology

Using a multi-effect evaporator to desalinate sodium sulfate wastewater will consume a large amount of steam, resulting in high energy consumption costs and high unit treatment costs for wastewate

Method used

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  • Sodium sulfate wastewater treatment process
  • Sodium sulfate wastewater treatment process
  • Sodium sulfate wastewater treatment process

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Embodiment Construction

[0025] Such as Figure 1 to Figure 4 Shown, the processing technology of a kind of sodium sulfate waste water of the present invention, comprises the following steps successively: (1) new sodium sulfate waste water enters preheating unit and carries out preheating temperature rise; (2) sodium sulfate waste water after preheating enters an effect falling film evaporator 1 3. The above-mentioned one-effect concentrated solution enters the second-effect falling film evaporator 3 for further heating, evaporation and concentration to become a second-effect concentrated solution; (4) the above-mentioned second-effect concentrated solution is fed by the transfer pump B3 Send it into the forced circulation evaporation crystallizer for heating and evaporation crystallization, and the crystal slurry containing sodium sulfate crystals is discharged from the salt leg at the bottom of the evaporation chamber 7a of the forced circulation evaporation crystallizer; (5) The crystal slurry conta...

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Abstract

The invention relates to a sodium sulfate wastewater treatment process. The treatment process sequentially comprises the following steps: (1) introducing new sodium sulfate wastewater into a preheating unit, and preheating to raise the temperature; (2) introducing the preheated sodium sulfate wastewater into a single-effect falling film evaporator, and performing heating evaporation concentration to obtain a single-effect concentrate; (3) introducing the single-effect concentrate into a double-effect falling film evaporator, and performing further heating evaporation concentration to obtain a double-effect concentrate; (4) feeding the double-effect concentrate into a forced circulation evaporation crystallizer through a material transfer pump, performing heating evaporation crystallization, and discharging crystal slurry containing sodium sulfate crystals from a salt leg at the bottom of an evaporation chamber of the forced circulation evaporation crystallizer; (5) separating the crystal slurry containing sodium sulfate crystals discharged from the salt leg by a centrifuge; (6) feeding the sodium sulfate crystals separated out by the centrifuge into a fluidized bed drying system through a material conveyor belt, and drying; and (7) introducing the dried sodium sulfate crystals into an automatic packaging system, and packaging to obtain an industrial sodium sulfate finished product. The process is low in energy consumption, and can realize full recovery of sodium sulfate.

Description

technical field [0001] The invention relates to a treatment process for sodium sulfate wastewater, belonging to the technical field of industrial wastewater treatment. Background technique [0002] Sodium sulfate-containing wastewater is one of the most common high-salt wastewater in industrial wastewater. Generally, due to its high salt content, it cannot be completely treated by wastewater treatment methods such as biochemical degradation. [0003] The Chinese invention patent application with the publication number CN 105776466A discloses a method for purifying sodium sulfate wastewater, which is carried out continuously in a purification system with three reaction tanks, and the waste water is put into the primary reaction tank where sodium sulfate wastewater is placed. Calcium bisulfite and calcium hydroxide emulsion with a mass fraction of 10-25% in the amount of sodium sulfate and other substances in the medium, and then put into the secondary reaction tank and the te...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D5/00
CPCC01D5/00C02F1/04C02F1/08C02F1/38Y02P20/10
Inventor 李鹏飞许亮王震付雨孙守光
Owner JIANGSU MYANDE ENERGY SAVING EVAPORATION EQUIP CO LTD
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