不饱和聚酯树脂高浓度废水共沸精馏资源化与治理技术
Recycling by azeotropic distillation and treatment technologies for high concentration wastewater from unsaturated polyester resin process
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摘要: 针对不饱和聚酯树脂生产高浓度废水的特点，采用新型共沸精馏技术进行资源化预处理。实验结果表明，共沸精馏几乎将废水中的原料、聚合中间体等有机物全部浓缩于釜液中，釜底浓缩液COD可高达120万mg/L左右，有机物回收率达93%~96%。将COD约120万mg/L的釜液以20%比例投入不饱和聚酯树脂合成反应中，制得了一种新型高性能树脂，且树脂的得率由常规生产的93.4%提高至99.77%。对与共沸剂分离后的COD约为1万mg/L的馏出液采用新型多技术协同催化氧化技术进行预处理，使废水B/C由0.021提高至0.3以上；再采用EGSB+MBBR生化处理和活性炭吸附深度处理，出水可稳定达标排放，并能满足循环冷却水要求。Abstract: Aiming at the characteristics of high concentration wastewater from unsaturated polyester resin process， a novel azeotropic distillation was adopted as a recycling pretreatment. The experimental results showed that by the azeotropic distillation， the organic compounds in the wastewater， such as raw materials， polymerization intermediate etc， were almost condensed in the tower bottom liquid with COD up to 1 200 000 mg/L， and the total recovery rate of the organic compounds was about 93%~96%. Feeding the condensed liquid with COD 1 200 000 mg/L into the unsaturated polyester resin synthesis in 20% ratio to another raw materials， a new unsaturated polyester resin with better performances was attained， and the yielding rate increased from 93.4% in traditional process to 99.77%. For the distilled wastewater with COD about 10 000 mg/L separated from the entrainer， a multi-technology enhanced catalytic oxidation technique was employed as pretreatment， resulting in the wastewater B/C increase from 0.021 to above 0.3. The pretreated wastewater was treated again with biochemical treatment by EGSB+MBBR technology and advanced treatment by activated carbon adsorption technology. Eventually， the quality of effluent water could meet the state’s discharge standard and the cooling water standard.
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Key words:
- unsaturated polyester resin /
- wastewater /
- azeotropic distillation /
- recycling /
- catalytic oxidation
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