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Saponification wastewater and desulfurization wastewater combined pretreatment process

A technology of saponification wastewater and desulfurization wastewater, which is applied in the direction of neutralization water/sewage treatment, water/sludge/sewage treatment, gaseous discharge wastewater treatment, etc., can solve the problem of high treatment cost, achieve good treatment effect, save resources, The effect of reducing processing costs

Pending Publication Date: 2021-12-24
DONGYING HUATAI CHEM GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the separate treatment process of the above two types of water, pH adjustment is required, and a large number of other chemicals need to be added to deal with the sulfate, sulfite and calcium ions, and the treatment cost is relatively high.

Method used

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  • Saponification wastewater and desulfurization wastewater combined pretreatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A combined pretreatment process of saponification wastewater and desulfurization wastewater, the treatment steps are as follows:

[0018] (1) In the process of preparing propylene oxide by the chlorohydrin method, the waste water generated in the saponification process enters the clarification tank for sedimentation, and the mud at the bottom of the clarification tank is pumped into the filter press system through a mud pump, and the treated filtrate and the supernatant of the clarification tank are jointly pumped into the The cooling tower is used to cool down; the sedimentation ratio reaches more than 95%.

[0019] (2) The saponification wastewater after cooling down to below 38°C and the desulfurization wastewater produced by the thermal power plant are put into the mixing reactor at a ratio of 4:1 for thorough reaction, the bottom sediment is quickly extracted, and the supernatant is transferred to the comprehensive adjustment tank Follow-up biochemical and advanced...

Embodiment 2

[0022] A combined pretreatment process of saponification wastewater and desulfurization wastewater, the treatment steps are as follows:

[0023] (1) In the process of preparing propylene oxide by the chlorohydrin method, the waste water generated in the saponification process enters the clarification tank for sedimentation, and the mud at the bottom of the clarification tank is pumped into the filter press system through a mud pump, and the treated filtrate and the supernatant of the clarification tank are jointly pumped into the The cooling tower is used to cool down; the sedimentation ratio reaches more than 95%.

[0024] (2) The saponification wastewater after cooling down to below 38°C and the desulfurization wastewater produced by the thermal power plant are put into the mixing reactor at a ratio of 5:1 for thorough reaction, the bottom sediment is quickly extracted, and the supernatant is transferred to the comprehensive adjustment tank for further processing Subsequent ...

Embodiment 3

[0027] A combined pretreatment process of saponification wastewater and desulfurization wastewater, the treatment steps are as follows:

[0028] (1) In the process of preparing propylene oxide by the chlorohydrin method, the waste water generated in the saponification process enters the clarification tank for sedimentation, and the mud at the bottom of the clarification tank is pumped into the filter press system through a mud pump, and the treated filtrate and the supernatant of the clarification tank are jointly pumped into the The cooling tower is used to cool down; the sedimentation ratio reaches more than 95%.

[0029] (2) The saponification wastewater after cooling down to below 38°C and the desulfurization wastewater generated by the thermal power plant are put into the mixing reactor at a ratio of 6:1 for thorough reaction, the bottom sediment is quickly extracted, and the supernatant is transferred to the comprehensive adjustment tank for further processing Subsequent...

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Abstract

The invention relates to the field of wastewater treatment, and in particular, relates to a saponification wastewater and desulfurization wastewater combined pretreatment process. According to the process, comprehensive pretreatment is carried out by utilizing the production conditions of two kinds of wastewater and the characteristics of the wastewater. The pH value can be adjusted by effectively utilizing the pH value of the wastewater, the addition amount of acid and alkali is reduced, and most sulfate radicals, sulfite radicals and calcium ions can be removed in the reaction. The treatment cost is reduced and the subsequent treatment difficulty is reduced. The method has important significance on wastewater treatment of chemical enterprises in which the two kinds of wastewater exist at the same time.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a joint pretreatment process of saponification wastewater and desulfurization wastewater. Background technique [0002] At present, a large amount of saponification wastewater is produced in the production process of propylene oxide by chlorohydrin method. The temperature of the wastewater is as high as 60-80°C, the pH value is as high as 10-12, and the salt content is high. CaCl 2 The mass fraction is 1.0%-4.0%, the SS mass fraction is 0.3%-0.5%, and the CODcr is between 600-1500mg / L. In addition, wastewater contains high concentrations of organic chlorides, mainly dichloropropane and dichloroisopropane, propylene glycol, chloropropanol and other derivatives of propylene oxide. In the prior art, acid is generally added first to adjust the pH value. After the adjustment, it is necessary to aerate or add soda ash to generate calcium carbonate precipitation to remove calcium io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/66C02F5/06C02F11/122C02F103/18C02F103/36
CPCC02F1/52C02F1/66C02F5/06C02F11/122C02F2103/36C02F2103/18
Inventor 韩继磊黄晓梅万蓬莱曹战龙李宗颖李宁赵晓萍
Owner DONGYING HUATAI CHEM GRP CO LTD
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