a School of Environment Science and Spatial Informatics , China University of Mining and Technology , Xuzhou , People's Republic of China.
J Air Waste Manag Assoc. 2018 Oct;68(10):1065-1076. doi: 10.1080/10962247.2018.1466741. Epub 2018 Jul 17.
In this study, m-xylene biodegradation was examined in bacteria-water mixed solution and biotrickling filter (BTF) systems amended with the nonionic surfactant Tween 80. The mixed bacteria were obtained from the activated sludge of a coking plant through a multisubstrate acclimatization process. High-throughput sequencing analysis revealed that Rhodanobacter sp. was the dominant species among the mixed bacteria. In the bacteria-water mixed solution, the bacterial density increased with increasing Tween 80 concentration. Hence, Tween 80 could be utilized as substrate by the mixed bacteria. Tween 80, with concentrations of 50-100 mg L, could enhance the bioavailability of m-xylene and consequently improve the degradation efficiency of m-xylene. However, further increasing the initial concentration of Tween 80 would decrease the degradation efficiency of m-xylene. At concentrations exceeding 100 mg L, Tween 80 was preferentially degraded by the mixed bacteria over m-xylene. In BTF systems, when the m-xylene inlet concentration was 1200 mg m and the empty bed residence time was 20 sec, the removal efficiency and elimination capacity of BTF1 with Tween 80 addition were at most 20% and 24% higher than those of BTF2 without Tween 80 addition. Overall, the integrated application of the mixed bacteria and surfactant was demonstrated to be a highly effective strategy for m-xylene waste gas treatment.
The integrated application of mixed bacteria and surfactant was demonstrated to be a promising approach for the highly efficient removal of m-xylene. Surfactant can activate mixed bacteria to degrade m-xylene by increasing its bioavailability. Besides, surfactant can be utilized as carbon source by the mixed bacteria so that the growth of mixed bacteria can be promoted. It is expected that the integrated application of both technologies will become more common in future chemical industry.
在这项研究中，研究了二甲苯在添加非离子表面活性剂吐温 80 的细菌-水混合溶液和生物滴滤器（BTF）系统中的生物降解情况。混合细菌是通过多底物驯化过程从焦化厂的活性污泥中获得的。高通量测序分析显示，混合细菌中的优势种为 Rhodanobacter sp.。在细菌-水混合溶液中，随着吐温 80 浓度的增加，细菌密度增加。因此，混合细菌可以利用吐温 80 作为底物。浓度为 50-100mg/L 的吐温 80 可以提高二甲苯的生物可利用性，从而提高二甲苯的降解效率。然而，进一步增加吐温 80 的初始浓度会降低二甲苯的降解效率。当浓度超过 100mg/L 时，混合细菌优先降解吐温 80 而不是二甲苯。在 BTF 系统中，当二甲苯入口浓度为 1200mg/m3，空床停留时间为 20 秒时，添加吐温 80 的 BTF1 的去除效率和去除容量比不添加吐温 80 的 BTF2 最多高 20%和 24%。总的来说，混合细菌和表面活性剂的综合应用被证明是一种高效处理二甲苯废气的策略。
混合细菌和表面活性剂的综合应用被证明是一种高效去除二甲苯的有前途的方法。表面活性剂可以通过增加其生物可利用性来激活混合细菌降解二甲苯。此外，混合细菌可以利用表面活性剂作为碳源，从而促进混合细菌的生长。预计这两种技术的综合应用将在未来的化学工业中变得更加普遍。
