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Treatment method of high-salinity wastewater in sodium methyl mercaptide production

A technology for sodium methyl mercaptide and high-salt wastewater, which is applied in the treatment of high-salt, toxic wastewater, and odor fields, and can solve problems such as high salt content, strong odor of wastewater, and troublesome operation

Active Publication Date: 2014-11-26
HEBEI CHENGXIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the physical adsorption method has a certain removal effect on odor, it is easy to cause secondary pollution; the cost of chemical oxidation and photocatalytic oxidation is high, and the operation is troublesome; the waste water treated by the present invention has a strong odor and high salt content, and it is difficult to use biochemical directly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Adjust the pH of the alkaline dark green brine with a COD of 20,000 mg / L and a salt content of 40% to 1 with sulfuric acid. At 80°C, bubbling with a slight negative pressure for 30 minutes, then adjust the pH to 8, and filter to remove the salt. The filtrate was concentrated to obtain the salt and the free water. The salt is pure white and tasteless; the evaporated water is tasteless and transparent, the COD is 148mg / L, the pH is 7.5, and the NH 3 -N is 0, reaching the secondary discharge standard of petrochemical industry in the "Integrated Wastewater Discharge Standard" (GB8978-1996).

Embodiment 2

[0013] Adjust the pH of the alkaline dark green brine with a COD of 23000 mg / L and a salt content of 42% to 1 with sulfuric acid. At 90°C, bubbling with a slight negative pressure for 30 minutes, then adjust the pH to 8, and filter to remove the salt. The filtrate was concentrated to obtain the salt and the free water. The salt is pure white and tasteless; the evaporated water is tasteless and transparent, the COD is 120mg / L, the pH is 7.0, and the NH 3 -N is 0, reaching the secondary discharge standard of petrochemical industry in the "Integrated Wastewater Discharge Standard" (GB8978-1996).

Embodiment 3

[0015] Adjust the pH of alkaline dark green brine with a COD of 23000 mg / L and a salt content of 42% to 1 with sulfuric acid. At 100°C, bubbling with a slight negative pressure for 30 minutes, then adjust the pH to 8, and filter to remove salt. The filtrate was concentrated to obtain the salt and the free water. The salt is pure white and tasteless; the evaporated water is tasteless and transparent, the COD is 85mg / L, the pH is 6.7, and the NH 3 -N is O, which reaches the first-level discharge standard of petrochemical industry in the "Integrated Wastewater Discharge Standard" (GB8978-1996).

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PUM

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Abstract

The invention relates to a treatment method of high-salinity wastewater in sodium methyl mercaptide production. The high-salinity wastewater is treated by a series of processes such as acidification, heating stripping, neutralization, filtration and evaporation concentration. The treatment method provided by the invention can be used for not only removing COD, NH3-N in the water to ensure that the pH meets the petroleum chemical secondary emission standards in Integrated Wastewater Discharge Standard (GB8978-1996), but also recycling a byproduct salt (the content accounts for 40% of raw water) from the wastewater, thereby obtaining excellent economic benefit while treating the wastewater, and as a result, the wastewater treatment cost is greatly reduced. The treatment method provided by the invention has the advantages of good odor removal effect, simple process, low cost and non-secondary pollution, and is easy to operate.

Description

technical field [0001] The invention provides a wastewater treatment method, which relates to a treatment method for high-salt, foul-smelling and toxic wastewater in the production of sodium methyl mercaptide. Background technique [0002] Sodium methyl mercaptide is an important organic compound, which can be used in the production of various pesticides such as methomyl, aldicarb and methionine. Its production process mostly adopts the reaction of sodium hydrosulfide and dimethyl sulfate, wherein sodium hydrosulfide is excessive so that dimethyl sulfate can be completely transformed. The reaction generates methyl mercaptan gas, which is then absorbed into a 20% sodium methyl mercaptide solution with liquid caustic soda. The waste water generated after the reaction contains a certain amount of sodium hydrosulfide, methyl sulfide and by-product Glauber's salt. The foul smell of wastewater is mainly from sodium hydrosulfide. [0003] In recent years, many domestic manufactur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
Inventor 郭会王硕硕赵彦霞姚立国张辰亮安彩妹南向竹
Owner HEBEI CHENGXIN