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Quality-based and salt-based treatment device and method for high-salinity wastewater in coal chemical industry

A high-salt wastewater and treatment method technology, applied in the field of water treatment, can solve the problems of lack of synergistic and effective technical means for removing fluoride and salt, and achieve the effect of realizing the utilization of water resources and salt resources, simple equipment, and shortening the process flow

Pending Publication Date: 2022-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the defluoridation of wastewater usually adopts the method of adding calcium to remove fluoride, and there is still a lack of effective technical means for the coordination of defluoridation and salt separation in the whole process

Method used

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  • Quality-based and salt-based treatment device and method for high-salinity wastewater in coal chemical industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] The main water quality characteristics of the coal chemical high-salt wastewater treated in this example are: pH=7.5, the concentration of total dissolved solids (TDS) is 25000 mg / L, and the Cl - The concentration is 3000mg / L, SO 4 2- The concentration is 9000mg / L, Mg 2+ The concentration is 30mg / L, Ca 2+The concentration is 50mg / L, the dissolved silicon concentration is 50mg / L, F - The concentration is 50mg / L, HCO 3 - The concentration of COD is 300mg / L, and the concentration of COD is 80mg / L.

[0083] process such as figure 1 As shown, the specific steps include:

[0084] Step 1, high-salt wastewater from the coal chemical industry enters the high-efficiency hard removal filter unit for treatment. First, add calcium chloride and magnesium chloride to the primary reaction tank, the concentration of which is 0.8g / L, the reaction time is 15min, the effluent overflows into the secondary reaction tank, add sodium carbonate and polyaluminium chloride, and add sodium...

Embodiment 2

[0098] The main water quality characteristics of the coal chemical high-salt wastewater treated in this example are: pH=8, the concentration of total dissolved solids (TDS) is 30000 mg / L, and the Cl - The concentration is 4000mg / L, SO 4 2- The concentration is 10000mg / L, Mg 2+ The concentration is 60mg / L, Ca 2+ The concentration is 100mg / L, the concentration of dissolved silicon is 100mg / L, F - The concentration is 60mg / L, HCO 3 - The concentration of COD is 400mg / L, and the concentration of COD is 100mg / L.

[0099] process such as figure 1 As shown, the specific steps include:

[0100] Step 1, high-salt wastewater from the coal chemical industry enters the high-efficiency hard removal filter unit for treatment. First, add calcium chloride and magnesium chloride to the first-level dosing reaction tank, the concentration of which is 1.1g / L and 1.5g / L respectively, and the reaction time is 20min. The effluent overflows into the second-level dosing reaction tank, and sodi...

Embodiment 3

[0114] The main water quality characteristics of the coal chemical high-salt wastewater treated in this example are: pH=8.5, the concentration of total dissolved solids (TDS) is 35000 mg / L, and the Cl - The concentration is 5000mg / L, SO 4 2- The concentration is 12000mg / L, Mg 2+ The concentration is 90mg / L, Ca 2+ Concentration of 150mg / L, dissolved silicon concentration of 150mg / L, F - The concentration is 80mg / L, HCO 3 - The concentration of COD is 500mg / L, and the concentration of COD is 120mg / L.

[0115] process such as figure 1 As shown, the specific steps include:

[0116]Step 1, high-salt wastewater from the coal chemical industry enters the high-efficiency hard removal filter unit for treatment. First, calcium hydroxide and magnesium oxide are added to the primary reaction tank at concentrations of 1.5g / L and 2.0g / L respectively, and the reaction time is 30 minutes. The effluent overflows into the secondary reaction tank, and sodium carbonate and polymerized chl...

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Abstract

The invention provides a quality-based and salt-based treatment device and method for coal chemical industry high-salinity wastewater. The coal chemical industry high-salinity wastewater is treated by adopting efficient hardness removal filtration, catalytic ozonation, ultrafiltration, efficient nanofiltration electrodialysis, reverse osmosis and evaporative crystallization, and by adopting the technology, a low-temperature heat source is effectively utilized, and near-zero emission and resource utilization of the coal chemical industry high-salinity wastewater are realized. Compared with the prior art, the process provided by the invention has the advantages of good effluent quality, high quality of recovered salts and good technical economy.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a device and a treatment method for separating high-salt wastewater from coal chemical industry. Background technique [0002] The high-salt wastewater in the coal chemical industry mainly comes from the gas washing wastewater in the production process, the drainage of the circulating water system, the drainage of the demineralized water system, the concentrated water of the reuse system, etc., and the concentration of total dissolved solids (TDS) is usually above 1%. The salinity in the wastewater is high, and the salts contained are mainly Cl - , SO 4 2- , F - 、Na + , Ca 2+ , Mg 2+ 、K + In the field of coal chemical industry, the state requires that the high-salt wastewater produced by enterprises must be strictly treated to achieve "near-zero discharge" of wastewater. Some enterprises usually use the combined process of "pretreatment-membrane concentration-evap...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/04C01D3/24C01D5/16C01D5/00
CPCC02F9/00C01D3/04C01D3/24C01D5/16C01D5/004C02F5/02C02F5/06C02F1/583C02F1/60C02F1/5245C02F1/001C02F1/78C02F1/725C02F1/444C02F1/442C02F1/4693C02F1/441C02F1/04C02F1/16C02F2209/06C02F2209/08C02F2209/10C02F2209/19C02F2209/29C02F2301/046C02F2303/14C02F2301/08
Inventor 张新妙郦和生彭海珠郭旻雯
Owner CHINA PETROLEUM & CHEM CORP
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