利用磁性固定化微生物降解水中微量油  

Degradation of trace oil in water using magnetic immobilized microorganism

作　　者：王永军 付文强 薛屏[1] 

机构地区：[1]宁夏大学化学化工学院省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏银川750021

出　　处：《化学工程》2017年第9期7-12,共6页Chemical Engineering(China)

基　　金：宁夏回族自治区科技支撑计划项目(NX2015076)

摘　　要：炼油循环水用量大且含有烃类等难降解有机物,因此需要探索高效、经济、环保的水处理技术。文中利用聚乙烯醇-海藻酸钠-Fe_3O_4粒子复合物包埋微生物,控制Fe_3O_4粒子质量分数为14.9%,磁性固定化微生物饱和磁化强度为8.59 emu/g,处理含柴油质量浓度60 mg/L模拟水,30℃反应72 h,降解率达到99%以上。而在相同条件下,游离微生物对水中微量油的降解率为86.8%,磁性固定化微生物经水中柴油驯化后,活性、耐酸碱和耐底物高浓度进一步提高,处理含柴油质量浓度60 mg/L模拟水,反应40 h降解率达到99%,并且处理640 mg/L,高质量浓度含油水降解率达95%以上。使用13次循环处理60 mg/L含油水,反应40 h的降解率均达95%以上,表明磁性固定化微生物具有优异的重复使用性。Because of the large consumption of refinery circulating water and it containing refractory hydrocarbons, it is essential to explore an efficient, economic and eco-friendly treatment of waster water. The immobilized microorganisms was prepared from PVA and SA with Fe3O4 particles mass fraction of 14.9% . The saturation magnetization was 8.59 emu/g. The biodegradation conditions for trace diesel in water （60 mg/L） were listed as the following： the temperature was 30 ℃, and the biodegradation time was 72 h. After treatment with the immobilized microorganisms, the degradation rate of diesel was above 99%. While do the analogy experiment with the free microorganisms, the degradation rate of diesel was only 86. 8%. Activation of the immobilized microorganisms with oil would lead to higher reactivity, resistance ability to acid and base, and high concentration of substrate. Treatment of diesel solution with 60 mg/L with the activated biocatalyst for 40 h, the degradation rate of diesel was 99%. For the degradation of diesel solution with 640 mg/L, the degradation rate of diesel was more than 95%. After biodegradation for 13 times, the immobilized microorganisms remained reactivity, resulting in the degradation rate of diesel over 95%.

关 键 词：炼油循环水 水处理 磁性固定化微生物 生物降解 

分 类 号：X172[环境科学与工程—环境科学]