Hu C, Acuna-Askar K, Englande A J
Environmental Health Sciences Department, Tulane University School of Public Health and Tropical Medicine, 1440 Canal Street New Orleans, Louisiana 70112-2715, USA.
Water Sci Technol. 2004;49(1):87-94.
Methyl tertiary-butyl ether (MTBE) is a synthetic chemical used in unleaded gasoline as an additive to reduce levels of ozone and carbon monoxide from auto exhaust. Due to its chemical and recalcitrant properties, MTBE has caused groundwater contamination worldwide. A laboratory-scale biofilter made of a natural fiber (kenaf) mat and inoculated with MTBE-degrading microorganisms, was evaluated for MTBE removal efficiency. Operational parameters of oxygen flow rate, hydraulic retention time (HRT), yeast extract and initial MTBE concentration were varied and MTBE removal efficiencies determined. Four kinetic models were evaluated to describe the MTBE removal in the reactor. Formaldehyde and tertiary butyl alcohol (the most two reported MTBE biodegradation byproducts) were not found in the effluent; instead, carbon dioxide was monitored as the end product based on the results of a metabolic mass balance evaluation. Toxicity of treated effluent was evaluated by employing the Microtox acute toxicity test and comparing that to the influent.
甲基叔丁基醚（MTBE）是一种合成化学品，用作无铅汽油中的添加剂，以降低汽车尾气中的臭氧和一氧化碳含量。由于其化学性质和难降解性，MTBE已在全球范围内造成地下水污染。对一个由天然纤维（红麻）垫制成并接种了降解MTBE微生物的实验室规模生物滤池进行了MTBE去除效率评估。改变了氧气流速、水力停留时间（HRT）、酵母提取物和初始MTBE浓度等运行参数，并测定了MTBE去除效率。评估了四个动力学模型来描述反应器中MTBE的去除情况。在流出物中未发现甲醛和叔丁醇（报道最多的两种MTBE生物降解副产物）；相反，根据代谢质量平衡评估结果，监测到二氧化碳是最终产物。通过使用Microtox急性毒性试验并将其与进水进行比较，评估了处理后流出物的毒性。
