CMC-膨润土固定化微生物降解对硝基苯酚废水的研究

Study on Degradation of p-Nitrophenol Wastewater by Immobilized Microorganism with CMC-Bentonite

为提高废水中的对硝基苯酚的降解效率,选择固定化微生物方法处理对硝基苯酚废水,以羧甲基纤维素钠和膨润土作为固定化原料,运用包埋法将从活性污泥中筛选出来的对硝基苯酚高效降解菌进行固定,并对其对对硝基苯酚的降解性能进行研究。结果表明:固定化微生物颗粒降解对硝基苯酚的最佳固液比为0.12,最适温度为35℃,适宜p H为9~12。在对硝基苯酚浓度为10 mg/L时,固定化微生物颗粒对其的降解率可达97.84%,在浓度不超过150 mg/L时,降解率均能保持在80%以上。研究表明,该固定化微生物颗粒可在碱性条件下有效降解对硝基苯酚废水。

In order to improve the degradation efficiency of p-nitrophenol in wastewater, the immobilized microbial method was used to degrade p-nitrophenol in wastewater. Sodium carboxymethyl cellulose and bentonite were selected as carriers to immobilize the efficient degradation bacteria which were screened from the activated sludge by embedding method. The degradation property of p-nitrophenol was studied. The results showed that the optimum solid to liquid ratio for p-nitrophenol degradation was 0.12, the optimum temperature was 35 ℃, and the optimum p H was 9-12. When the concentration of p-nitrophenol was 10 mg/L, the degradation rate by the immobilized microorganism particles could reach 97.84%, and the degradation rate could remain above 80% when the concentration was less than 150 mg/L. The research showed that the immobilized microbial particles could effectively degrade p-nitrophenol in wastewater under alkaline conditions.