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Method for removing foul odor of wastewater

A technology for wastewater and odor, which is applied in the field of wastewater odor removal, can solve the problems of unsuitable wastewater treatment, high operation cost, large investment, etc., and achieves the effect of high utilization rate of oxidant, wide application range and high removal efficiency.

Inactive Publication Date: 2019-04-30
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Beijing Sanju Environmental Protection New Materials Co., Ltd. applied for a patent on an organic sulfur removal process, which describes the method of hydrogenation and catalytic conversion of carbonyl sulfide-containing gases into inorganic sulfides to achieve the removal of organic sulfur. The patented method only It can be applied to the treatment of organic sulfur in gas, and the cost is high and difficult, so it is not suitable for wastewater treatment
[0007] To sum up, there are still defects such as high operating cost, large investment and easy to produce secondary pollution in the removal method of malodorous odor in the prior art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A company’s pesticide production wastewater contains 10% (mass) of sodium chloride, a COD content of 5000 mg / L, and an organic sulfur content of 245 ppm.

[0032] (1) Catalytic oxidation: adjust the pH of the wastewater to 8, add hydrogen peroxide, which accounts for 3% of the wastewater mass, and pass it into the oxidation tower after mixing evenly. The main substances in the oxidation solution are methyl thiocyanate, dimethyl disulfide, sulfur Ethyl cyanate, ethyl methyl disulfide;

[0033] (2) Evaporation: The above-mentioned oxidizing liquid is passed into an evaporator, and evaporated at a pressure of 50kPa and a temperature of 80°C to obtain white sodium chloride salt and condensate. The substances contained in the condensate are methanol, ethanol, methyl mercaptan, Methyl disulfide, ethyl methyl disulfide, strong odor;

[0034] (3) Ozone oxidation: The condensate is passed into the oxidation tower equipped with Ф25 ceramic Raschig ring packing, and ozone with a ...

Embodiment 2

[0038] A company’s pesticide production wastewater contains 10% (mass) of sodium chloride, a COD content of 5000 mg / L, and an organic sulfur content of 245 ppm.

[0039] (1) Catalytic oxidation: adjust the pH of the wastewater to be 8, add 1% hydrogen peroxide, which accounts for the quality of the wastewater, and pass it into the oxidation tower after mixing evenly. The main substances in the oxidation solution are methanol, ethanol, methyl acetate, methyl thiocyanate, di Methyl disulfide, ethyl thiocyanate, ethyl methyl disulfide;

[0040] (2) Evaporation: Put the above oxidation liquid into the evaporator, evaporate at 50kPa, 80°C to obtain white sodium chloride salt and condensate, the substances contained in the condensate are methanol, ethanol, methyl mercaptan, dimethyl disulfide Ether, ethyl methyl disulfide, strong odor;

[0041] (3) Ozone oxidation: The condensate is passed into the oxidation tower equipped with Ф25 ceramic Raschig ring packing, and ozone with a con...

Embodiment 3

[0045] A company’s pesticide production wastewater contains 10% (mass) sodium chloride, a COD content of 5000 mg / L, and an organic sulfur content of 245 ppm.

[0046] (1) Catalytic oxidation: adjust the pH of the wastewater to be 8, add 3% sodium hypochlorite, which accounts for the quality of the wastewater, and pass it into the oxidation tower after mixing evenly. The main substances in the oxidation solution are methyl thiocyanate, dimethyl disulfide, and thiocyanate ethyl acetate, ethyl methyl disulfide;

[0047] (2) Evaporation: Put the above oxidation liquid into the evaporator, evaporate at 50kPa, 80°C to obtain white sodium chloride salt and condensate, the substances contained in the condensate are methanol, ethanol, methyl mercaptan, dimethyl disulfide Ether, ethyl methyl disulfide, strong odor;

[0048] (3) Ozone oxidation: The condensate is passed into the oxidation tower equipped with Ф25 ceramic Raschig ring packing, and ozone with a concentration of 80mg / L is pas...

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Abstract

The invention discloses a method for removing foul odor of wastewater. The method includes the following steps: catalytic oxidation: adjusting the wastewater pH, adding an oxidant, and introducing thewastewater into an oxidation tower 1 filled with a heterogeneous catalyst to obtain a treatment liquid 1; evaporation: introducing the treatment liquid 1 into an evaporation device, separating to obtain a salt and a condensate, reusing the salt in production, and further deodorizing the condensate; ozonation: introducing the condensate into an oxidation tower 2 loaded with a filler, at the same time, introducing ozone from the bottom of the oxidation tower 2 to the oxidation tower 2 in a form of micro-bubbles, to obtain a treatment liquid 2 and tail gas, carrying out biochemical treatment ofthe treatment liquid 2, and discharging; and tail gas circulation: connecting ozone tail gas of the tower top of the oxidation tower 2 to the oxidation tower 1. The method has the advantages of complete removal of foul odor, no generation of secondary pollution, low cost, energy saving and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a method for removing foul smell from waste water. Background technique [0002] In a broad sense, all the gases with a large odor emitted in the atmosphere are collectively referred to as malodorous odors, especially sulfur-containing odors. These malodorous gases strongly stimulate people's psychology, cause poisoning in severe cases, pollute the environment, and endanger human health. One of the seven major public hazards, in order to reduce the harm of malodorous gas to human beings, governance must be strengthened. [0003] The removal of odor is different from general air pollution control, which is determined by the generation, distribution and physical and chemical properties of odorous gases. At present, the main methods of odor removal are: water washing, activated carbon adsorption, incineration, condensation, liquid cleaning, biodegradation, photolysis, ozone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/34
CPCC02F1/04C02F1/66C02F1/725C02F1/78C02F3/30C02F9/00C02F2101/40C02F2303/02
Inventor 李晓伟毛兵江海云王安龙王栋
Owner ZHEJIANG QICAI ECO TECH CO LTD
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