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High salinity wastewater treatment method

A high-salt wastewater treatment method technology, applied in energy wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problem of long treatment time, achieve effective recovery, facilitate industrialization, and shorten treatment time.

Inactive Publication Date: 2016-11-23
JIANGSU SUNRISE CHEM ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method can effectively recover sodium chloride and sodium sulfate in the high-salt wastewater in the coal chemical industry, and the process conditions are simple and stable, which is convenient for industrialization; but this treatment method takes a relatively long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The treatment method of the high-salt wastewater of the present embodiment, the concrete steps of this treatment method are as follows:

[0018] (1) One-effect heating: pass the high-salt wastewater into the first-effect heat exchanger for preheating, and set the temperature of the first-effect heat exchanger to 65°C;

[0019] (2) Primary evaporation and crystallization: Send the high-salt wastewater heated by the first effect to the primary evaporation crystallizer for evaporation and concentration. The evaporation concentration temperature is 95°C, and crystals will gradually precipitate as the water evaporates; %, stop evaporating; carry out solid-liquid separation at 90°C to obtain sodium sulfate crystals and primary mother liquor, wherein the sodium sulfate crystals are directly mined;

[0020] (3) Cooling and crystallization: Crystallize the primary mother liquor at a temperature of -10°C, and then conduct solid-liquid separation at this temperature to obtain a mi...

Embodiment 2

[0024] The treatment method of the high-salt wastewater of the present embodiment, the concrete steps of this treatment method are as follows:

[0025] (1) One-effect heating: pass the high-salt wastewater into the first-effect heat exchanger for preheating, and set the temperature of the first-effect heat exchanger to 75°C;

[0026] (2) Primary evaporation and crystallization: send the high-salt wastewater heated by the first effect to the primary evaporation crystallizer for evaporation and concentration. The evaporation concentration temperature is 105°C, and crystals will gradually precipitate as the water evaporates; After that, stop the evaporation; carry out solid-liquid separation at 100°C to obtain sodium sulfate crystals and primary mother liquor, wherein the sodium sulfate crystals are directly mined;

[0027] (3) Cooling and crystallization: crystallize the primary mother liquor at a temperature of 0°C, and then conduct solid-liquid separation at this temperature t...

Embodiment 3

[0031] The treatment method of the high-salt wastewater of the present embodiment, the concrete steps of this treatment method are as follows:

[0032] (1) One-effect heating: pass the high-salt wastewater into the first-effect heat exchanger for preheating, and set the temperature of the first-effect heat exchanger to 70°C;

[0033] (2) Primary evaporation and crystallization: Send the high-salt wastewater heated by the first effect to the primary evaporation crystallizer for evaporation and concentration. %, stop evaporating; carry out solid-liquid separation at 95°C to obtain sodium sulfate crystals and primary mother liquor, wherein the sodium sulfate crystals are directly mined;

[0034] (3) Cooling and crystallization: The primary mother liquor is crystallized at a temperature of -5°C, and then solid-liquid separation is carried out at this temperature to obtain a mixed salt containing sodium sulfate decahydrate and sodium chloride dihydrate, and a cooling mother liquor....

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Abstract

The invention relates to a treatment method for high-salt wastewater, which recovers sodium sulfate and sodium chloride through five treatment steps of first-effect heating, first-time evaporation and crystallization, cooling and crystallization, second-effect heating and second-time evaporation and crystallization. The advantages of the present invention are: the treatment method of the present invention, through the first-effect heating and the second-effect heating, enables the solution to quickly meet the temperature of evaporation and concentration, thereby shortening the treatment time; at the same time, through the treatment method, the high-efficiency effect on the coal chemical industry The sodium chloride and sodium sulfate in the brine wastewater are effectively recovered, which greatly reduces the pressure on environmental protection and the process conditions are simple and stable, which is convenient for industrialization.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating high-salt wastewater in the coal chemical industry. Background technique [0002] In the process of coal chemical production, a large amount of sewage is discharged, which contains not only organic matter, but also a large amount of salt. Coal chemical wastewater is biochemically treated to reduce organic matter, and filtered to remove solid matter. The remaining wastewater mainly contains sodium sulfate, sodium sulfide, and trace amounts of other salts, which is usually called high-salt wastewater. [0003] The treatment technology of high-salt wastewater has been studied for decades at home and abroad, and the methods commonly used at present mainly include biological method, SBR process method and evaporation desalination method. Among the many high-salt wastewater treatment technologies, the evaporative desalination method has the advantages of mature...

Claims

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Application Information

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IPC IPC(8): C02F1/02C02F1/04C01D3/06C01D5/00
CPCY02W10/37C02F1/02C01D3/06C01D5/00C02F1/048C02F2001/5218C02F2301/08
Inventor 钱园金杰
Owner JIANGSU SUNRISE CHEM ENG TECH
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