Enzyme treatment process for organic wastewater containing mercaptans and sulfides

An enzyme treatment and thioether technology, which is applied in the field of enzyme treatment technology, can solve the problems of difficult disposal and high treatment cost, and achieve the effects of reducing sludge production, reducing operating costs, and reducing the dosage of Fenton.

Active Publication Date: 2022-05-06
QILU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the treatment of organic wastewater containing mercaptans and thioethers, solid waste ferric hydroxide is easy to form, and the pH needs to be controlled at about 9 to achieve good results. The generated secondary sludge is dangerous solid waste, and its disposal is difficult. Large and expensive to process

Method used

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  • Enzyme treatment process for organic wastewater containing mercaptans and sulfides
  • Enzyme treatment process for organic wastewater containing mercaptans and sulfides
  • Enzyme treatment process for organic wastewater containing mercaptans and sulfides

Examples

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Effect test

Embodiment 1

[0024] Embodiment 1: Enzyme treatment process of 2-chloro-5-chloromethylthiazole production process wastewater

[0025]

[0026] 2-Chloro-5-chloromethylthiazole production process wastewater contains sodium thiocyanide, methylthiazole intermediates, and a small amount of 2-chloro-5-chloromethylthiazole, sodium chloride, produced by conventional Fenton oxidation A large amount of chemical sludge needs to be disposed of as hazardous chemical waste, and the cost of sludge disposal in the later stage is high. Using the process route of the present invention can effectively improve the disposal efficiency and reduce the dosage of chemicals, thereby reducing the amount of sludge generated from the source.

[0027] Such as figure 1 As shown, the specific operation steps:

[0028] (1) Take 1000ml of water sample, adjust the pH of the waste water at 5-6, the temperature at 40-60 degrees Celsius, the amount of peroxidase complex (enzyme activity index greater than 50,000 enzyme acti...

Embodiment 2

[0038] Example 2: Enzyme Treatment Process Containing Xanthate Wastewater

[0039] Wastewater containing xanthate is derived from the waste gas spray absorption tower in the production process of xanthate. The main component is non-methane total hydrocarbon sulfide (all volatile hydrocarbons other than methane, mainly C 2 -C 8 ), the COD concentration is 1000-5000mg / L.

[0040] Such as figure 1 As shown, the specific operation steps:

[0041] (1) Take 1000ml of water sample, adjust the pH of the waste water at 5-6, the temperature at 30-40 degrees Celsius, the amount of peroxidase complex (enzyme activity index greater than 50,000 enzyme activity units): 0.05% of the total amount of waste water , Peroxidase compound enzyme ratio: chloroperoxidase, Phanerochaete chrysosporium peroxidase mixed according to the weight ratio of 1:1, 30% hydrogen peroxide (COD and 30% hydrogen peroxide weight ratio: 1:0.25 ), using stirring form, the concentration of dissolved oxygen in wastewa...

Embodiment 3

[0051] Embodiment 3: Enzyme treatment process of methionine production wastewater

[0052] Methionine production wastewater contains methionine, methyl mercaptan, ethanethiol, dimethyl sulfide, diethyl sulfide, and dimethyl disulfide. After anaerobic-aerobic biochemical treatment, it enters the pilot test device for further The state of the water is continuous water inflow, COD=90-110mg / L.

[0053] Such as figure 1 As shown, the specific operation steps:

[0054] (1) Take 1000ml of water sample, adjust the pH of the waste water at 5-6, the temperature at 30-40 degrees Celsius, the amount of peroxidase complex (enzyme activity index greater than 50,000 enzyme activity units): 0.05% of the total amount of waste water , Peroxidase compound enzyme ratio: chloroperoxidase, Phanerochaete chrysosporium peroxidase mixed according to the weight ratio of 1:1, 30% hydrogen peroxide (COD and 30% hydrogen peroxide weight ratio: 1:0.3 , adopt stirring form, dissolved oxygen concentration...

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Abstract

The invention relates to an enzyme treatment process for organic wastewater containing mercaptans and thioethers. The method comprises the following steps: (1) adjusting the pH of the wastewater, adding peroxidase and hydrogen peroxide; (2) adding ferrous sulfate solution and Hydrogen peroxide; (3) In the neutralization and degassing stage, PAM solution is added after adjusting the pH, and the precipitation is separated; (4) The waste water treated in step (3) enters the sedimentation tank for treatment. Under the premise of ensuring that the treatment effect is equivalent to that of the Fenton process, the present invention can significantly reduce the amount of ferrous sulfate and hydrogen peroxide, thereby achieving the effect of reducing the amount of sludge at the source; the original Fenton process device is not changed, and the overall operating cost is not affected. ; The present invention also has the potential to further reduce the dosage of Fenton to reduce sludge production and reduce operating costs.

Description

technical field [0001] The invention relates to an enzyme treatment process for organic wastewater containing mercaptans and sulfides, belonging to the technical field of sewage treatment. Background technique [0002] The problem of environmental pollution is already one of the problems that our country is facing. Refractory and smelly wastewater such as pesticides and chemicals are more likely to attract people's attention. [0003] Thiols refer to a class of non-aromatic compounds containing a sulfhydryl functional group (-SH). Structurally speaking, it can be seen that the oxygen in ordinary alcohol is replaced by sulfur. Except for methyl mercaptan which is a gas at room temperature, other mercaptans are liquid or solid. Lower mercaptans generally have an unpleasant smell and are toxic. Some mercaptans can be used as drugs, antidotes and rubber vulcanization accelerators, and can also be used as raw materials for synthetic fungicides. For example, 2-mercaptobenzothi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/34C02F103/18C02F103/36
CPCC02F9/00C02F3/342C02F1/722C02F1/66C02F1/20C02F1/56C02F2001/007C02F11/12C02F2101/34C02F2101/40C02F2305/026C02F2103/36C02F2103/18C02F2303/06
Inventor 杨云军
Owner QILU UNIV OF TECH
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