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Method for removing foul odor of sulfur-containing organic wastewater

A technology for organic waste water and odor, applied to chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of secondary pollution, inability to use waste water treatment, high investment and operating costs, etc., to achieve simple process and realize Resource-based processing and low operating costs

Inactive Publication Date: 2019-02-19
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Biological removal of malodorous gas is a treatment technology that uses microorganisms to degrade odorous substances to make them odorless and harmless. It has the advantages of high deodorization efficiency, simple device, low cost, and convenient operation and maintenance. It is widely used in low-concentration odor Odor treatment; water washing, activated carbon adsorption, liquid cleaning, etc. only transfer pollutants, but do not completely degrade them, and are prone to secondary pollution; incineration, photolysis, ozone oxidation, plasma, etc. can completely decompose odorous substances into odorless Substances, but prone to secondary pollution, and high investment and operating costs
[0005] The Chinese patent document with the publication number CN106362565A applied by Shanghai Fule Pharmaceutical Technology Co., Ltd. discloses a tail gas absorbing device and method containing dimethyl sulfide, and the tail gas containing dimethyl sulfide is passed into a scrubbing device that adds an oxidant , to degrade odorous substances through oxidant oxidation. This patent uses oxidant oxidation, which has no selectivity and is more suitable for occasions with low concentrations and single organic substances. Clean production has not been realized, and there are problems of incomplete degradation and secondary pollution.
[0006] The Chinese patent literature with the publication number CN104944699A applied by Yangzhou University discloses a method for removing odorous substances from oil factory wastewater. The method of biodegradation is used to remove odorous substances. The method described in this patent cannot be used for high-salt, high-temperature Treatment of organic matter and wastewater containing biologically toxic sulfur-containing substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Advanced oxidation: adjust the wastewater pH to be 5, filter, and take the quality of the filtrate as a benchmark, add 1‰ ferrous chloride and 3% hydrogen peroxide (hydrogen peroxide concentration is 27.5%) in the filtrate, oxidation reaction at 50 ° C 1 hour;

[0037] (2) Alkaline hydrolysis: adjust the pH of the above-mentioned treatment solution to be 11, and stir at 50° C. for 3 hours;

[0038] (3) Solid-liquid separation: After alkaline hydrolysis, the treatment liquid is separated from the solid and liquid through a filter press to obtain a mixture of ferric hydroxide and iron sulfide and a treatment liquid. The COD concentration of the treatment liquid is 4500 mg / L, and the concentration of dimethyl sulfide is 0mg / L, the concentration of dimethyl disulfide is 0mg / L, no foul smell;

[0039] (4) Dissolving: adding the mixture of ferric hydroxide and ferric sulfide into the hydrochloric acid solution with a mass concentration of 10%, stirring constantly, produc...

Embodiment 2

[0042] (1) Advanced oxidation: adjust the wastewater pH to 5, filter, and take the quality of the filtrate as a benchmark, add 1‰ of ferrous chloride and 5% hydrogen peroxide to the filtrate, and perform an oxidation reaction at 50°C for 1 hour;

[0043] (2) Alkaline hydrolysis: adjust the pH of the above treatment solution to be 11, and stir at 50° C. for 2 hours;

[0044] (3) Solid-liquid separation: After alkaline hydrolysis, the treatment liquid is separated from the solid-liquid through a filter press to obtain a mixture of ferric hydroxide and iron sulfide and a treatment liquid. The COD concentration of the treatment liquid is 3150 mg / L, and the concentration of dimethyl sulfide 0.1mg / L, the concentration of dimethyl disulfide is 0.5mg / L, no foul smell;

[0045] (4) dissolving: adding the mixture of ferric hydroxide and ferric sulfide is in the hydrochloric acid solution of 10% in mass concentration, constantly stirs, produces the hydrochloric acid solution of hydrogen ...

Embodiment 3

[0048] (1) Advanced oxidation: adjust the pH of wastewater to be 4, filter, and take the quality of the filtrate as a benchmark, add 0.5‰ copper sulfate pentahydrate and 3% hydrogen peroxide to the filtrate, and perform an oxidation reaction at 50°C for 1 hour;

[0049] (2) Alkaline hydrolysis: adjust the pH of the above treatment solution to 11, and stir at 50°C for 1 hour;

[0050] (3) Solid-liquid separation: After alkaline hydrolysis, the treatment liquid is separated from the solid and liquid through a filter press to obtain a mixture of ferric hydroxide and iron sulfide and the treatment liquid. The COD is 4150 mg / L, methyl sulfide 0 mg / L, and dimethyl Base disulfide 0mg / L, no foul smell;

[0051] (4) dissolving: the mixture of ferric hydroxide and ferric sulfide is added in 10% hydrochloric acid solution, constantly stirs, produces the hydrochloric acid solution of hydrogen sulfide gas and ferric chloride;

[0052] (5) Absorption: Pass hydrogen sulfide into the absorptio...

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PUM

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Abstract

The invention relates to the technical field of wastewater treatment, and discloses a method for removing foul odor of sulfur-containing organic wastewater. The method includes steps of (1), regulating the pH (potential of hydrogen) of the sulfur-containing organic wastewater until the sulfur-containing organic wastewater is acidic, adding metal salt and hydrogen peroxide into the sulfur-containing organic wastewater and carrying out advanced oxidation treatment on the sulfur-containing organic wastewater to obtain treatment fluid I; (2), regulating the pH of the treatment fluid I until the pHof the treatment fluid I reaches 10 at least, stirring the treatment fluid I and carrying out alkaline hydrolysis; (3), carrying out solid-liquid separation by means of filtering after alkaline hydrolysis is carried out so as to obtain filter residues and treatment fluid II, regulating the pH of the treatment fluid II and then carrying out follow-up treatment; (4), adding the filter residues intoacid solution, stirring the filter residues to obtain hydrogen sulfide gas and treatment fluid III, and reusing the treatment fluid III for regulating the pH of the sulfur-containing organic wastewater and supplementing metal ions at the step (1); (5), absorbing the hydrogen sulfide gas by alkaline liquor to obtain sulfide salt. The method has the advantages that high-salinity and high-concentration wastewater with a high sulfur content and organic matters can be treated by the aid of the method, and sulfur further can be recycled and reused.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for removing the foul smell of sulfur-containing organic wastewater. 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] Malodorous substances can be divided into five categories according to their composition: sulfur-containing compounds, nitrogen-containing compounds, halogens and their derivatives, hydrocarbons, and oxygen-containing organic substances. The removal of odor is different from general air pollution control, which is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/30C02F101/20
CPCC02F1/5236C02F1/66C02F1/722C02F9/00C02F2101/20C02F2101/203C02F2101/30C02F2101/40C02F2209/06C02F2209/08C02F2303/02C02F2305/026
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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