Method for treating rubber vulcanization accelerator wastewater by combination of MVR (mechanical vapor recompression) evaporation and chemical treatment

A technology of rubber vulcanization and chemical treatment, applied in chemical instruments and methods, multi-stage water treatment, water/sewage treatment, etc. The effect of reducing COD in sewage

Active Publication Date: 2016-03-23
KEMAI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fenton oxidation, multi-effect evaporation, biochemical and other methods are often used in traditional industries. The operating costs of Fenton oxidation and multi-effect evaporation are very high. Biochemical treatment has

Method used

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  • Method for treating rubber vulcanization accelerator wastewater by combination of MVR (mechanical vapor recompression) evaporation and chemical treatment

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1:

[0019] The raw water is wastewater from rubber vulcanization accelerator CZ:

[0020] (1) Evaporation of raw water: The raw water is heated to 80°C by an effect evaporator and the salt concentration is 15%.

[0021] (2) Organic matter removal: Add 31% hydrochloric acid to close to saturated water to adjust pH=1, mix and stir for 30 minutes, and collect the solid resin through a filter press.

[0022] (3) Neutralization: Add 32% liquid caustic soda to the incoming water with pH=1 to adjust pH=6 and then enter the two-effect evaporator.

[0023] (4) The treated incoming water enters the two-effect evaporator to evaporate and crystallize salt 1.1t.

[0024] The steam condensate COD collected by the first-effect evaporator and the second-effect evaporator at 500mg / L is directly used for the reuse of the production water in the workshop to obtain a white sodium chloride salt with a salt content of 98.5%.

Example Embodiment

[0025] Example 2:

[0026] The raw water is the waste water of rubber vulcanization accelerator NS:

[0027] (1) Evaporation of raw water: The raw water is heated to 90°C by an effect evaporator and the salt concentration is 20%.

[0028] (2) Resin precipitation: add sulfuric acid to nearly saturated water to control pH=3, mix and stir to settle for 45 minutes, and collect the solid resin through a filter press.

[0029] (3) Neutralization: Add calcium hydroxide to the incoming water with pH=3 to adjust pH=7 and then enter the two-effect evaporator.

[0030] (4) The treated incoming water enters the two-effect evaporator to evaporate and crystallize 1.3t of salt.

[0031] The steam condensate COD collected by the first-effect evaporator and the second-effect evaporator at 550mg / L is directly used for reuse of the production water in the workshop to obtain white sodium chloride salt with a salt content of 98.9%.

Example Embodiment

[0032] Example 3:

[0033] The raw water is wastewater from rubber vulcanization accelerator DZ:

[0034] (1) Evaporation of raw water: the raw water is heated to 100°C by an effect evaporator and the salt concentration is 25%.

[0035] (2) Resin precipitation: add 31% hydrochloric acid to close to saturated water to control pH=5, mix and stir to settle for 60 minutes, and collect the solid resin through a filter press.

[0036] (3) Neutralization: Add 32% liquid caustic soda to the incoming water with pH=5 to adjust pH=8 and then enter the two-effect evaporator.

[0037] (4) The treated incoming water enters the two-effect evaporator and evaporates for 3 hours to obtain a saturated solution and crystallize 1.7t of salt.

[0038] The steam condensed water COD collected by the first-effect evaporator and the second-effect evaporator at 601mg / L is directly used for the reuse of the production water in the workshop to obtain white crystalline salt with a salt content of 98.1%.

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Abstract

The invention provides a method for treating rubber vulcanization accelerator wastewater by combination of MVR (mechanical vapor recompression) evaporation and chemical treatment. The method comprises the steps of putting wastewater into a first effect evaporator of the MVR, heating steam until the evaporating temperature of a vapor phase is 80 to 100 DEG C, evaporating supplied material wastewater and enabling the salt concentration of same to reach 15 percent to 25 percent; adding the wastewater with 15 percent to 25 percent of salt concentration by evaporating into a stirring tank with a stirring function for performing acid adjustment and adjusting the pH to 1 to 5, performing filter pressing and recycling resin after mixing and sedimenting for 30 to 60 min; adding alkali into the wastewater after filter pressing and adjusting the pH to 6 to 8, then entering into a second effect evaporator of the MVR for concentration, and separating salt by a centrifugal machine; the combination of the most energy-efficient MVR evaporation technology and chemical treatment is adopted, industrial salt which can be exported can be obtained, COD (Chemical Oxygen Demand) of the wastewater is greatly reduced, the effluent standard can be met after post processing; the COD of condensation water by MVR evaporation is very low and the condensation water can be reused for production, the water consumption of production is lowered, and the production cost is saved.

Description

technical field [0001] The invention relates to the field of wastewater treatment of rubber additives, in particular to a method for treating wastewater of rubber accelerators, and provides a method for treating wastewater of rubber vulcanization accelerators by combining MVR evaporation and chemical treatment. technical background [0002] Wastewater from rubber additives is a typical high-COD, high-salt, biochemically difficult organic wastewater. Traditional industries basically have no good treatment methods, which can not only remove COD in wastewater, but also recover salt in wastewater. Fenton oxidation, multi-effect evaporation, biochemical and other methods are often used in traditional industries. The operating costs of Fenton oxidation and multi-effect evaporation are very high. Biochemical treatment has very high requirements for the stability of wastewater quality. The change of wastewater discharge water quality will affect the biochemical operation, cause the ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F103/34
CPCC02F1/048C02F1/52C02F9/00C02F2103/34C02F2301/08
Inventor 薛兴杰孙风娟向立闫超宁甫杰
Owner KEMAI CHEM
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