发酵法长链二元酸工业废水处理技术研究

Study on Industrial Wastewater Treatment Technology of Long-chain Dibasic Acid by Fermentation

某发酵法长链二元酸工业废水水质复杂,COD浓度为7520 mg/L,硫酸盐浓度为12950 mg/L,含盐量为23100 mg/L,总磷浓度为216 mg/L,已成为该工艺及相关企业发展瓶颈。采用“调节池+接触氧化池+臭氧催化+化学脱硬除磷+超滤纳滤+多效蒸发+硝结晶”工艺路线,其中接触氧化池投加特种耐盐菌,臭氧催化采用自研Fe_(2)O_(3)/ACNT复合催化剂,工艺前后两端多层次化学除磷,最终出水COD浓度小于150 mg/L,含盐量约3100 mg/L,总磷浓度小于0.5 mg/L,满足相关工业园区污水进水要求,同时得到高纯度硫酸钠产品,为高盐、高磷、高有机物废水的处理提供了技术支持。

The water quality of industrial wastewater from long-chain dicarboxylic acid by fermentation was very complicated,with COD concentration of 7520 mg/L,sulfate concentration of 12950 mg/L,salt concentration of 23100 mg/L and total phosphorus concentration of 216 mg/L,which had become the bottleneck of the development of this technology and related enterprises.The process flow of“regulating tank+contact oxidation tank+ozone catalysis+chemical dehydriding and dephosphorization+ultrafiltration and nanofiltration+multi-effect evaporation+nitrate crystallization”was adopted,in which special salt-tolerant bacteria was added into the contact oxidation tank,self-developed Fe_(2)O_(3)/ACNT composite catalyst was used for ozone catalysis,and multi-level chemical dephosphorization was carried out at the front and rear ends.The final effluent COD concentration was less than 150 mg/L,the salt concentration was about 3100 mg/L,and the total phosphorus concentration was less than 0.5 mg/L,which met the requirements of sewage inflow in relevant industrial parks.At the same time,high-purity sodium sulfate products were obtained,providing technical support for the treatment of wastewater with high salt,high phosphorus and high organic matter.