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A method for treating propylene oxide high-COD alkaline wastewater by biochemical process

A propylene oxide and waste water technology, which is applied in aerobic process treatment, aerobic and anaerobic process treatment, anaerobic digestion treatment and other directions, can solve the problems of innocence, resource utilization, and heavy environmental burden.

Active Publication Date: 2021-12-31
辽宁中舟得水环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only cannot effectively realize harmlessness and resource utilization, but also causes a heavy environmental burden.

Method used

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  • A method for treating propylene oxide high-COD alkaline wastewater by biochemical process
  • A method for treating propylene oxide high-COD alkaline wastewater by biochemical process

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for biochemical processing of propylene oxide high COD alkaline wastewater, its technical scheme is as follows:

[0031] Step 1, acidification treatment, skimming off the slick oil on the surface of the wastewater, then adding sulfuric acid to adjust the pH value of the wastewater to 2, stirring evenly and then standing still, oily organic matter will appear on the surface of the wastewater, and the oil layer is skimmed to obtain the crude phenolic component in the wastewater ;

[0032] Step 2, air flotation treatment, the acidified wastewater is subjected to air flotation treatment, and the oily organic matter precipitated from the wastewater is further separated;

[0033] Step 3, coagulation and precipitation, adding 0.5mol / L sodium hydroxide solution to adjust the pH value to 5, and then adding 0.1kg / m 3 The polyacrylamide is stirred and mixed uniformly and enters the sedimentation tank to remove coagulated organic matter; it is characterized in that the fl...

Embodiment 2

[0044] A method for biochemical processing of propylene oxide high COD alkaline wastewater, its technical scheme is as follows:

[0045] Step 1, acidification treatment, skimming the slick oil on the surface of the wastewater, then adding sulfuric acid to adjust the pH value of the wastewater to 3, stirring evenly and then standing still, oily organic matter will appear on the surface of the wastewater, and the oil layer is skimmed to obtain the crude phenolic component in the wastewater ;

[0046] Step 2, air flotation treatment, the acidified wastewater is subjected to air flotation treatment, and the oily organic matter precipitated from the wastewater is further separated;

[0047] Step 3, coagulation and precipitation, add 2.5mol / L sodium hydroxide solution to adjust the pH value to 7, then add 0.5kg / m 3 The polyacrylamide is stirred and mixed uniformly and enters the sedimentation tank to remove coagulated organic matter; it is characterized in that the flocculant is a ...

Embodiment 3

[0057] A method for biochemical processing of propylene oxide high COD alkaline wastewater, its technical scheme is as follows:

[0058] Step 1, acidification treatment, skimming the slick oil on the surface of the wastewater, then adding sulfuric acid to adjust the pH value of the wastewater to 4, stirring evenly and then standing still, oily organic matter will appear on the surface of the wastewater, and the oil layer is skimmed to obtain the crude phenolic component in the wastewater ;

[0059] Step 2, air flotation treatment, the acidified wastewater is subjected to air flotation treatment, and the oily organic matter precipitated from the wastewater is further separated;

[0060] Step 3, coagulation and precipitation, adding 5mol / L sodium hydroxide solution to adjust the pH value to 8, and then adding 1kg / m 3 The polyacrylamide is stirred and mixed uniformly and enters the sedimentation tank to remove coagulated organic matter; it is characterized in that the flocculant...

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Abstract

The invention relates to the field of industrial wastewater treatment, in particular to a method for treating propylene oxide high-COD alkaline wastewater by a biochemical process; the method is an economical and effective treatment method for propylene oxide industrial wastewater, and the invention adopts acidification treatment, gas Floatation treatment, coagulation sedimentation and ozone oxidation treatment continuously reduce the COD content in the wastewater until it reaches the biochemical treatment standard, and finally use biochemical treatment to completely remove the COD in the wastewater, especially a metallocene composite flocculant is used in the present invention To flocculate the COD in the wastewater, the COD value in the water can be reduced by 40%-60%. It is especially suitable for the treatment of propylene oxide high COD alkaline wastewater. The cost of wastewater treatment in the method of the present invention is low, the floor area is small, and it is easy to Implementation has the prospect of industrialization.

Description

technical field [0001] The invention relates to the field of industrial waste water treatment, in particular to a method for treating propylene oxide high COD alkaline waste water through a biochemical process. Background technique [0002] Propylene oxide is mainly used in the production of polyether polyols, propylene glycol and various nonionic surfactants, and is an important basic chemical raw material. At present, the production technology of propylene oxide in domestic industry is mainly the co-oxidation method, and the problem of wastewater treatment has always been concerned. [0003] 201811612382.8 Provides a propylene oxide wastewater pretreatment process, which belongs to the field of wastewater treatment. The invention aims at high-salt, high-COD propylene oxide wastewater, and can decompose macromolecular organic matter through acidolysis, aeration and stripping operations, and Recover acetone, propylene oxide and other low boiling point substances for propyle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/34C02F103/36
CPCC02F9/00C02F2103/36C02F2101/345C02F2101/34C02F1/40C02F1/66C02F1/24C02F2001/007C02F1/56C02F1/54C02F1/78C02F3/28C02F3/02C02F3/30
Inventor 王静贾祥娟王永林王盼盼苗畅通叶兆剑
Owner 辽宁中舟得水环保科技有限公司
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