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Method for treating polyether polyol process wastewater

The technology of polyether polyol and ether polyol is applied in the field of treating polyether polyol process wastewater, which can solve the problems of complicated process flow and increase the cost of sewage treatment, and achieve the effect of reducing the content of organic matter.

Active Publication Date: 2016-03-23
ZIBO ZHENGDA ENERGY SAVING NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the technological process for polyether polyol wastewater treatment is relatively complicated, which increases the cost of sewage treatment

Method used

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  • Method for treating polyether polyol process wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Drug preparation:

[0023] To prepare 15% polyaluminum chloride (PAC): first put 100Kg of polyaluminum chloride into the dissolving tank, stir and fill up with tap water, and stir for 0.5h.

[0024] To prepare 0.1% polyaluminum chloride (PAM): first fill the dissolving tank with tap water, slowly add 1Kg of polyacrylamide under stirring conditions, and stir for at least 1 hour.

[0025] 2. Steps:

[0026] (1) adjust the pH value of polyether polyol waste water with hydrochloric acid solution to be 3, then adopt catalyst for pretreatment, so that the B / C ratio of waste water is 0.51; the catalyst is alumina, magnesia whose mass ratio is 95:5 The composition of the catalyst accounts for 0.1% of the total amount of polyether polyol wastewater;

[0027] (2) After adjusting the pH value of the wastewater treated in step (1) to 7.8 with sodium hydroxide solution, enter the sludge biochemical tank to control the dissolved oxygen concentration of 0.71mg / L, pH value of 7.3,...

Embodiment 2

[0030] 1. The preparation of medicine is as in Example 1.

[0031] 2. Steps:

[0032] (1) adjust the pH value of polyether polyol waste water with hydrochloric acid solution to be 3.5, then adopt catalyst for pretreatment, so that the B / C ratio of waste water is 0.53; the catalyst is alumina, magnesium oxide whose mass ratio is 95:5 The composition of the catalyst accounts for 0.23% of the total amount of polyether polyol wastewater;

[0033] (2) After adjusting the pH value of the wastewater treated in step (1) to 7.6 with sodium hydroxide solution, it enters the sludge biochemical tank to control the dissolved oxygen concentration of 0.78mg / L, pH value of 7.3, ORP value of 85mV and hydraulic retention The time was 21h, and polyaluminum chloride, polyacrylamide, and ammonium chloride were added for stirring, and finally a catalyst was added; wherein, the mass ratio of polyaluminum chloride, polyacrylamide, and ammonium chloride was 1:1:1, and the mass ratio of polyaluminum c...

Embodiment 3

[0036] 1. The preparation of medicine is as in Example 1.

[0037] 2. Steps:

[0038] (1) adjust the pH value of polyether polyol waste water with hydrochloric acid solution to be 5, then adopt catalyst to carry out pretreatment, so that the B / C ratio of waste water is 0.55; described catalyst is alumina, magnesia whose mass ratio is 95:5 The composition of the catalyst accounts for 0.28% of the total amount of polyether polyol wastewater;

[0039] (2) After adjusting the pH value of the wastewater treated in step (1) to 7.4 with sodium hydroxide solution, it enters the sludge biochemical tank to control the dissolved oxygen concentration of 0.79mg / L, pH value of 7.5, ORP value of 80mV and hydraulic retention The time was 25h, and polyaluminum chloride, polyacrylamide, and ammonium chloride were added for stirring, and finally a catalyst was added; wherein, the mass ratio of polyaluminum chloride, polyacrylamide, and ammonium chloride was 2:1:1, and the mass ratio of polyalum...

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Abstract

The invention relates to wastewater treatment, in particular to a method for treating polyether polyol process wastewater. The method comprises the steps that acid liquor is adopted for adjusting the pH value of wastewater to 3-6, then pretreatment is performed, and the BOD / COD ratio of the wastewater is made to be 0.5-0.6; alkali liquor is adopted for adjusting the pH value of the wastewater to 7-8, the wastewater is made to enter a sludge biochemical tank, the dissolved oxygen concentration, the pH value, the ORP value and the hydraulic retention time are controlled, aluminum polychlorid, polyacrylamide and ammonium chloride are added for stirring, and finally a catalyst is added; the treated wastewater enters a primary precipitation tank for precipitation, a supernate enters an aerobiotic tank for the aeration operation, the dissolved oxygen concentration, the pH value, the ORP value and the hydraulic retention time in the aerobiotic tank are controlled, and polyacrylamide is added; the treated wastewater enters a secondary precipitation tank, the supernate is discharged, and sludge flows back to the aerobiotic tank. According to the method, the content of organic matter in wastewater can be effectively decreased, the total removal rate of pollutants can reach 89% to the highest extent, and the organic concentration COD is decreased to be 200 mg / L or lower.

Description

technical field [0001] The invention relates to wastewater treatment, in particular to a method for treating wastewater from polyether polyol process. Background technique [0002] The wastewater generated in the production process of polyether polyol is very complex and has poor biodegradability. It is recognized as one of the organic chemical wastewaters that are difficult to treat. Due to the characteristics of polyether polyol production process, the water quality of polyether polyol wastewater varies greatly, and its COD value is about 250-13000mg / L. [0003] At present, the technical process for the treatment of polyether polyol wastewater is relatively complex, which increases the cost of wastewater treatment. Therefore, there is an urgent need to study a method for treating wastewater from polyether polyol process, which can effectively reduce the organic content in wastewater, have high total removal rate of pollutants and low cost. SUMMARY OF THE INVENTION [0...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/38
CPCC02F1/52C02F1/66C02F3/02C02F3/121C02F3/1215C02F9/00C02F2101/30C02F2101/34C02F2103/38C02F2301/08C02F2305/00
Inventor 荆晓东薛喜宁董伟孙言丛
Owner ZIBO ZHENGDA ENERGY SAVING NEW MATERIAL
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