Tehran Wastewater Company, and Environment Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
Environ Technol. 2012 Sep;33(16-18):1937-43. doi: 10.1080/09593330.2012.655313.
A laboratory-scale anaerobic sequencing batch reactor was used to evaluate treatment of a synthetic substrate mixture representing petrochemical wastewater containing methyl tert-butyl ether (MTBE), ethanol and acetic acid. Influent MTBE concentrations were 5, 10 and 50 mg/l (corresponding to MTBE loading rates of 0.2, 0.4 and 2 mg/l.d) with overall organic loading rates (OLRs) of 1.51, 3.23 and 3.25 g COD/1.d, respectively. These OLRs resulted in removal efficiencies for MTBE of 78%, 98% and 88%. Removal efficiencies for chemical oxygen demand were 85% and 90% with influent MTBE concentrations of 5 and 10mg/l, but were significantly reduced to 72% with influent MTBE concentrations of 50mg/l. During all reactor runs, effluent concentrations oftert-butyl alcohol (TBA) were below the detection limit. Batch degradation of the organic substrate mixture demonstrated initial inhibitory effects when exposed to MTBE concentrations of 50 mg/l and complete inhibition with MTBE concentrations above 2000 mg/l. It is interesting to note that in batch tests using MTBE as the sole organic substrate (initial MTBE concentrations of 50, 100 and 200 mg/l), the specific methanogenic activity decreased to below detection within the first 96 hours, but following a 72-hour lag phase the methane production increased again. Based on low volatile fatty acid (VFA) concentration, disappearance of TBA peaks and no findings of any other intermediate via gas chromatography/mass spectrometry, while the MTBE concentration is still high, it can be suggested that during the batch tests the breakdown of gas production and the following lag phase were the direct effect of higher MTBE concentrations (more than 50 mg/l) and not because of the TBA or VFA accumulations.
采用实验室规模的厌氧序批式反应器处理一种代表石化废水的合成基质混合物,其中含有甲基叔丁基醚 (MTBE)、乙醇和乙酸。进水 MTBE 浓度分别为 5、10 和 50mg/l(对应 MTBE 负荷率分别为 0.2、0.4 和 2mg/l.d),总有机负荷率 (OLR) 分别为 1.51、3.23 和 3.25gCOD/1.d。这些 OLR 导致 MTBE 的去除率分别为 78%、98%和 88%。当进水 MTBE 浓度为 5 和 10mg/l 时,化学需氧量的去除率分别为 85%和 90%,但当进水 MTBE 浓度为 50mg/l 时,去除率显著降低至 72%。在所有反应器运行期间,出水叔丁醇 (TBA) 浓度均低于检测限。当暴露于 50mg/l 的 MTBE 浓度时,有机基质混合物的批量降解表现出初始抑制作用,而当 MTBE 浓度高于 2000mg/l 时则完全抑制。有趣的是,在使用 MTBE 作为唯一有机底物的批量测试中(初始 MTBE 浓度为 50、100 和 200mg/l),特定甲烷生成活性在最初的 96 小时内降至检测限以下,但在 72 小时的滞后阶段后,甲烷生成再次增加。基于低挥发性脂肪酸 (VFA) 浓度、TBA 峰消失以及气相色谱/质谱未发现任何其他中间产物,可以得出结论,在批量测试期间,产气量下降和随后的滞后阶段是由于较高的 MTBE 浓度(高于 50mg/l)的直接影响,而不是由于 TBA 或 VFA 的积累。