Treatment method of polyether polyol production tail water

A technology of polyether polyol and treatment method, which is applied in the field of environmental engineering, can solve problems such as complex process and high cost, achieve high degradation efficiency, low operating cost, and reduce the demand for chemical carbon sources

Inactive Publication Date: 2020-03-06
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above method has significantly improved the treatment of polyether polyol production tail water, the complex process or high cost may become a limiting factor for large-scale industrial application
At present, there is no patent disclosure to directly use biological methods to treat polyether polyols to produce tail water

Method used

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  • Treatment method of polyether polyol production tail water
  • Treatment method of polyether polyol production tail water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this example, the physical and chemical properties of the polyether polyol production tail water and citric acid production wastewater used are shown in Table 1. The co-metabolic degradation process of polyether polyol production tail water is divided into six stages (gradually increasing the COD concentration of polyether polyol production tail water influent, while gradually reducing the COD concentration of citric acid production wastewater in the influent water).

[0031] (1) Phase I:

[0032] 500mL of citric acid production wastewater (adjusting the COD concentration to 500mg / L) was pumped into the sequencing batch bioreactor (the hydraulic retention time was 12h), and ammonium chloride and potassium dihydrogen phosphate were added at the same time to adjust the COD in the reactor influent :TN:TP=100:5:1, after 10 days of stable operation, the average COD removal rate of the reactor effluent at this stage is 86.6%.

[0033] (2) Phase II:

[0034] 500mL mixed s...

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Abstract

Belonging to the technical field of environmental engineering, the invention discloses a treatment method of polyether polyol production tail water. According to the invention, biological treatment iscarried out on equipment flushing water, condensed water and other tail water in polyether polyol production. Starting from the perspective of waste control by waste, the method adopts citric acid production wastewater or sodium acetate as a co-metabolic matrix to treat polyether polyol production tail water, employs co-metabolism technology for step-by-step domestication culture of microorganisms, and in the domestication process, while the concentration of the polyether polyol production tail water is gradually increased, the adding amount of the co-metabolic matrix is gradually reduced till the end of domestication, i.e. the co-metabolic matrix is not added any more. The domesticated microorganisms can directly take part of in-situ organic matters in wastewater as the co-metabolic matrix to realize efficient degradation and up-to-standard discharge of polyether polyol production tail water.

Description

technical field [0001] The invention relates to a treatment method for tail water produced by polyether polyols, and belongs to the technical field of environmental engineering. Background technique [0002] Polyether polyols, a polymer compound polymerized by ether or epoxy compounds, are widely used in many fields such as detergents, cosmetics, paper coatings, textile modification, construction chemistry, etc., leading to an increase in annual demand. [0003] The high-concentration polyether polyol production tail water (biochemical oxygen demand (COD) ≥ 100g / L) produced during the polyether polyol extraction process can be directly burned after being concentrated and added with a combustion aid. However, the low-concentration polyether production tail water mixed with equipment cleaning water, cooling water, circulating water, etc. has the characteristics of large water volume and poor biodegradability (BOD / COD≤0.2). The technology is coupled with the biological process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F101/34C02F103/38
CPCC02F3/34C02F2101/34C02F2103/38
Inventor 刘和柳文浩郑志永崔敏华张衍叶元
Owner JIANGNAN UNIV
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