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Unsaturated polyester wastewater treatment and reuse method

A polyester wastewater, unsaturated technology, applied in natural water treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of uneconomical and practical, insufficient comprehensiveness, change of sludge properties, etc., and achieve good economic benefits and environmental benefits

Inactive Publication Date: 2015-05-06
SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for such unsaturated polyester wastewater with single composition and high concentration of organic matter, it is far from enough to use biochemical treatment to supplement nitrogen, phosphorus and inorganic salts by mixing domestic sewage, and additional artificial dosing It is not comprehensive enough, and it will also increase the operating cost of wastewater treatment, which is not economical and practical
In addition, if the biological treatment system lacks certain substances for a long time, it will lead to changes in the properties of the sludge, causing a series of operational problems such as viscous expansion and poor impact resistance.

Method used

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  • Unsaturated polyester wastewater treatment and reuse method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The treatment method of the invention is used to treat the unsaturated polyester resin wastewater produced in the polycondensation stage. Unsaturated polyester resin is produced with ethylene glycol, ethylene glycol, propylene glycol, phthalic anhydride, and maleic anhydride as the main raw materials, and the discharge of polyester wastewater is 30 m 3 / d, the content of organic matter in polyester wastewater is about 15 wt%, of which the content of dihydric alcohol is about 11.2~11.8 wt%, the content of phthalic anhydride and maleic anhydride is 2.5~2.7 wt%, and the content of other light organic matter is 0.3~ 1.2 wt%. This set of equipment has been continuously operated for 3 months, and the specific operating conditions and operating effects are shown in Table 1.

[0023] Table 1 Main processing unit and processing effect of Embodiment 1

[0024]

Embodiment 2

[0026] Using the treatment method of the present invention to treat the same polyester waste water as in Example 1 under different conditions, this set of equipment has been continuously operated for 3 months, and the specific operating conditions and operating treatment effects are shown in Table 2.

[0027] Table 2 Example 2 main processing unit and processing effect

[0028]

Embodiment 3

[0030] According to the ratio of COD:N:P=400:5:1, 10g of feces was added per ton of wastewater before the primary aerobic SBBR treatment after pyrolysis treatment, and the rest of the treatment conditions were the same as in Example 1. After 3 months of continuous operation of the device, the COD of the effluent was 161 mg / L, and the BOD 5 It was 28.7 mg / L, ammonia nitrogen was 8.5 mg / L, and volatile phenol was 3.0 mg / L.

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Abstract

The invention discloses an unsaturated polyester wastewater treatment and reuse method. The method comprises the following steps: rectifying unsaturated polyester wastewater, concentrating and recovering material components with a high boiling point, and condensing material components with a lower boiling point to form organic wastewater; hydrolyzing the organic wastewater formed after condensation; and carrying out secondary aerobic biochemical treatment on the hydrolyzed organic wastewater. The method can thoroughly solve the pollution of the unsaturated polyester wastewater, makes the wastewater harmless, and has the characteristics of stable running of a biochemical treatment system, good biochemical treatment effect, high organic material recovery rate, treatment of a waste with another, small occupied land, economy and practicality, and water obtained after the treatment can be used as technologic supplied water or dilution water.

Description

Technical field [0001] The present invention involves the treatment and reuse method of an unsaturated polyester wastewater, especially the treatment of a polyester wastewater generated during the production process of unsaturated polyester resin (UPR) production process.Or dilute water. Background technique [0002] Unsaturated polyester resin (UPR) is made by a chemical reaction of dual acid and dual alcohol. High concentration of unsaturated polyester wastewater is mainly generated in the reactive water of the alcoholic anhydride. The organic matter content is as high as about 15WT%is mainly intermediate products such as ethylene glycol, propylene glycol, one -shrinkable dismic glycol, benhypenide, and cashmere anhydride, and some low -molecular polyester monomers. [0003] Early polyester companies mostly use the method of incineration of heat media furnaces to deal with polyester waste water, but because the system pressure is not easy to balance, and there are serious safet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/38
CPCC02F9/00C02F1/04C02F3/02C02F3/1263C02F3/1268C02F3/28C02F2101/30C02F2103/38
Inventor 张蕾郭宏山李宝忠马宁朱卫
Owner SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD