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Method for treating epoxy resin waste-water with high alkalinity, high salt and high content of organics

A treatment method, epoxy resin technology, applied in the direction of natural water treatment, water/sewage multi-stage treatment, heating water/sewage treatment, etc., can solve the problems of not considering the comprehensive recycling of energy, not considering the connection mode of membrane modules, etc. , to achieve the effect of good effluent water quality, small footprint and advanced technology

Inactive Publication Date: 2009-12-09
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The 200610051605.9 technology considers the use of waste heat in the production process of epoxy resin as the energy source for membrane distillation operations, but does not consider the comprehensive recycling of energy in the system; nor does it consider the different membrane modules, the connection methods of membrane modules, and the integration of membrane modules Influence of process, operation mode of membrane module, etc.

Method used

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  • Method for treating epoxy resin waste-water with high alkalinity, high salt and high content of organics
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  • Method for treating epoxy resin waste-water with high alkalinity, high salt and high content of organics

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Embodiment 1

[0037] see figure 1 , After the waste water is produced from the reactor, it first enters the regulating tank. The salt (mainly sodium chloride) content in the waste water is 10%, and the COD is greater than 7500ppm.

[0038] Since bisphenol A and other organic impurities in wastewater are soluble in alkaline, and the solubility is very small in neutral, so the wastewater is first adjusted to neutral with hydrochloric acid, and then pumped to a filter for membrane filtration through a booster pump to remove precipitated organic matter , During membrane filtration, the wastewater flow rate is 40L / h, the permeate side vacuum is 0.08MPa, and the feed temperature is 50°C; the filtered organic matter is incinerated.

[0039] The wastewater from which precipitated organic matter has been removed enters the membrane distillation system for concentration and dehydration after being heated, and the salt concentration in the wastewater is concentrated to 20% to obtain a concentrated sol...

Embodiment 2

[0046] see figure 2 After the high-salt wastewater flows out from the epoxy resin production reactor, the wastewater with a salt concentration higher than 10% is collected in a regulating tank (mainly sodium chloride), and the COD of the wastewater is usually above 10000ppm.

[0047] Since organic substances such as residual bisphenol A, epichlorohydrin, and their derivatives that have not fully reacted in wastewater are soluble in alkaline, the solubility usually decreases in neutral conditions. Using this feature, the wastewater is first adjusted to Neutral, some higher molecular weight macromolecules are precipitated by bubbling or stirring, and the precipitated organic matter is removed through membrane filtration. During membrane filtration, the wastewater flow rate is 160L / h, and the vacuum degree of the permeation side is 0.09MPa. The feed temperature is 80°C; the filtered organic matter is incinerated.

[0048] The waste water from which precipitated organic matter h...

Embodiment 3

[0057] The wastewater containing organic matter with a salt concentration greater than 10% is adjusted to neutrality by acid, and is filtered through a microporous membrane filter through a booster pump to remove precipitated organic matter in high-salt wastewater. The wastewater flow rate of membrane filtration is generally controlled at 2m 3 / h, depending on the processing capacity of the subsequent membrane distillation device, the wastewater can be heated through the preheating pool, so that the wastewater feed temperature can be controlled within the range of 50-80 °C.

[0058] The evaporation flux of the membrane distillation process is related to the processing capacity of the process. For this reason, the hollow fiber membrane module used for membrane distillation is optimally designed. The ratio of length to diameter (L / D) of the membrane module is 3 ~5, the filling coefficient of the hollow fiber membrane in the module is controlled within the range of 10~40%. In th...

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Abstract

The invention discloses a method for treating epoxy resin wastewater with high alkalinity, high salt and high organic matter content, which comprises the following steps: (1) neutralization and membrane filtration; (2) membrane distillation; (3) evaporation and concentration; (4) Crystallization. The method of the invention solves the problem of high-saline alkaline wastewater that is difficult to treat in traditional biological treatment (biological bacteria are difficult to survive under high-salt and high-alkali conditions), and has advanced technology, compact equipment, small footprint, and good effluent quality. The waste heat of the washing wastewater itself and the low-energy heat source generated by the process itself can be used, which effectively saves energy and operating costs. Recycling sodium chloride, a by-product in production, can reduce operating costs and create economic benefits.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a treatment method for epoxy resin production wastewater with high alkalinity, high salt and high organic matter content. Background technique [0002] The wastewater pollution problem with high salinity and high organic content produced in the production process of epoxy resin has gradually become a bottleneck restricting the further development of the industry. Especially the production of solid epoxy resin requires a large amount of high-quality washing water. At present, the water consumption of each ton of solid epoxy resin is more than 15 tons. Some manufacturers produce high-quality epoxy resin. The waste water is even as high as 20 tons, which causes a lot of waste of water resources in our country, especially in areas where water resources are scarce. On the other hand, it is difficult to treat high-salt epoxy resin waste water, and ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F1/08C02F1/44C02F103/36
Inventor 陈欢林包培善张林包秀群王许云项建强王树源包秀媚
Owner ZHEJIANG UNIV
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