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Method for treating organic chemical wastewater having high COD and high concentration of sulfate ions

A technology of organic chemical industry and wastewater treatment, applied in the field of environmental engineering and microbiology, can solve the problems that cannot be promoted and widely used, and achieve the effect of easy transformation, less process and low cost

Inactive Publication Date: 2010-09-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above technologies have made valuable explorations on the treatment of wastewater with high organic concentration containing high sulfate radicals, they are still unable to be promoted and widely used due to their own technical limitations.

Method used

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  • Method for treating organic chemical wastewater having high COD and high concentration of sulfate ions
  • Method for treating organic chemical wastewater having high COD and high concentration of sulfate ions

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Embodiment 1

[0023] A chemical factory is mainly engaged in the production of cosmetic raw materials, lubricating oil additives and other products. The main pollutants in its wastewater are organic substances such as alcohols, fatty acid sodium salts and fatty acid esters. Production wastewater has complex components, high pollution load and acidity. The original process uses caustic soda to adjust the pH, which is costly and highly inhibits the anaerobic stage, and the effluent is unqualified.

[0024] Adopt method of the present invention, press Ca(OH) 2 :H + The molar ratio is 1:2 to add Ca(OH) to chemical wastewater 2 , stirring the reaction, adjusting the pH value to 6.7-7.5, removing most of the sulfate and H + , after standing still for one hour, the precipitation was removed, and the supernatant was transported to the anaerobic reactor. Control the temperature of the liquid at 10-30°C, add nitrogen and phosphorus sources according to the ratio of COD:N:P=450:5:1, adjust the pH ...

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Abstract

The invention discloses a method for treating organic chemical wastewater having high COD (chemical oxygen demand) and high concentration of sulfate ions. The method mainly comprises the following steps of: Ca(OH)2 pre-treatment; anaerobic treatment; two-stage aerobic treatment and the like, wherein after the organic chemical wastewater is subjected to Ca(OH)2 pre-treatment to remove most of sulfate ions and H<+> (hydrogen ions), a method for wastewater anaerobic treatment, which takes the advantages of anaerobic bacteria, and a method for wastewater aerobic treatment, which is mainly based on halophilic aerobic microorganisms, can be formed by controlling the microorganisms as the main agent for wastewater treatment and the operating parameter factors. Therefore, the invention is particularly suitable for the treatment of organic chemical wastewater having high COD, high concentration of sulfate ions and low pH value.

Description

technical field [0001] The invention belongs to the field of environmental engineering and microorganism technology, in particular to a method for treating acidic organic chemical waste water with high COD and high concentration of sulfate radicals by combining chemistry and biology. Background technique [0002] A large amount of high-concentration sulfate wastewater exists in mining, metallurgy, food and pharmaceutical industries. If the wastewater is directly discharged into the water body without treatment, it will cause a series of hazards, such as: ① Corrosion of pipes. In all kinds of water pipes, it will directly reduce the resistance of water and increase corrosion, and indirectly affect the circulation of sulfate-reducing bacteria and the spread of biological corrosion; ② Excessive sulfate radicals can cause foul odor in the water body and affect the sense of water Characters and its use; ③Excessive sulfate radicals are not conducive to crop growth and salinize the...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30
Inventor 吴敏郑刚张勇
Owner ZHEJIANG UNIV
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