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Method for treating polyether polyol process wastewater

A polyether polyol and waste water technology, which is applied in multi-stage water treatment, aerobic process treatment, natural water body treatment, etc., can solve the problems of complex process flow and increased sewage treatment cost, and achieve the effect of reducing the content of organic matter

Active Publication Date: 2018-01-09
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] Preparation of 15% polyaluminum chloride (PAC): first put 100Kg of polyaluminum chloride into the drug-dissolving tank, stir and fill up with tap water, and stir for 0.5h.

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

[0025] 2. Steps:

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

[0027] (2) Use sodium hydroxide solution to adjust the pH value of the wastewater treated in step (1) to 7.8, enter the sludge biochemical tank, and control the dissolved oxygen concentration of 0.71...

Embodiment 2

[0030] 1. Drug preparation as in Example 1.

[0031] 2. Steps:

[0032] (1) Regulate polyether polyol waste water pH value with hydrochloric acid solution and be 3.5, adopt catalyzer to carry out pretreatment then, make the B / C ratio of waste water be 0.53; Described catalyzer is the alumina, magnesia that mass ratio is 95:5 The composition, the catalyst accounts for 0.23% of the total amount of polyether polyol wastewater;

[0033] (2) Use sodium hydroxide solution to adjust the pH value of the wastewater treated in step (1) to 7.6, enter the sludge biochemical tank, and control the dissolved oxygen concentration of 0.78mg / L, pH value of 7.3, ORP value of 85mV and hydraulic retention Time 21h, and add polyaluminum chloride, polyacrylamide, ammonium chloride to stir, finally add catalyst; Among them, the mass ratio of polyaluminum chloride, polyacrylamide, ammonium chloride is 1:1:1, polychloride The sum of the mass of aluminum chloride, polyacrylamide and ammonium chloride ...

Embodiment 3

[0036] 1. Drug preparation as in Example 1.

[0037] 2. Steps:

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

[0039] (2) Use sodium hydroxide solution to adjust the pH value of the wastewater treated in step (1) to 7.4, and then enter 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 Time 25h, and add polyaluminum chloride, polyacrylamide, ammonium chloride to stir, finally add catalyst; Among them, the mass ratio of polyaluminum chloride, polyacrylamide, ammonium chloride is 2:1:1, polychloride The sum of the mass of aluminum chloride, polyacrylamide and ammonium chlor...

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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 polyether polyol process wastewater. Background technique [0002] The wastewater generated during the production of polyether polyols has complex components and poor biodegradability, and is recognized as one of the difficult-to-treat organic chemical wastewaters. 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 technological process for polyether polyol wastewater treatment is relatively complicated, which increases the cost of sewage treatment. Therefore, there is an urgent need to study a method for effectively reducing the organic matter content in wastewater, high total pollutant removal rate, and low cost for treating polyether polyol process wastewater. Contents of the invention [0004] The object of the pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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