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
CN105417846BActive Publication Date: 2018-01-09ZIBO ZHENGDA ENERGY SAVING NEW MATERIAL
6 Cites 1 Cited by

Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
ZIBO ZHENGDA ENERGY SAVING NEW MATERIAL
Publication Date
2018-01-09

Smart Images

  • Figure 1
    Figure 1
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More