Elyasi Shilan, Fallah Narges, Bonakdarpour Babak, Mahboubi Amir, Taherzadeh Mohammad J
Department of Chemical Engineering, Amirkabir University of Technology, 15875-4413, Tehran, Iran.
Department of Chemical Engineering, Amirkabir University of Technology, 15875-4413, Tehran, Iran.
Bioresour Technol. 2021 Dec;342:125988. doi: 10.1016/j.biortech.2021.125988. Epub 2021 Sep 20.
In the current study, styrene was removed anaerobically from wastewaters at temperatures of 35 ℃, 25 ℃, and 15 ℃ and concentration range of 20-150 ppm in the presence of ethanol as a co-substrate and co-solvent. Maximum styrene removal of 93% was achieved at 35 ℃. The volatilization of styrene was negligible at about 2% at all experimented temperatures. The average special methane yield (SMY) at 35 ℃ was 4.14- and 225-times higher than that of at T = 25 ℃ and T = 15 ℃, respectively, but no methane was produced in the absence of ethanol. The proteins content of the soluble microbial product (SMP) and extracellular polymeric substance (EPS) was much higher than the carbohydrate content. At styrene concentration > 80 ppm, SMY, SMP, and EPS dropped sharply. The results confirmed the well performance of anaerobic microorganisms in removing styrene from wastewater and biogas production at mesophilic condition.
在当前研究中，以乙醇作为共底物和共溶剂，在35℃、25℃和15℃的温度以及20 - 150 ppm的浓度范围内，对废水中的苯乙烯进行厌氧去除。在35℃时，苯乙烯的最大去除率达到93%。在所有实验温度下，苯乙烯的挥发量可忽略不计，约为2%。35℃时的平均比甲烷产量（SMY）分别比25℃和15℃时高4.14倍和225倍，但在没有乙醇的情况下不产生甲烷。可溶性微生物产物（SMP）和胞外聚合物（EPS）的蛋白质含量远高于碳水化合物含量。当苯乙烯浓度>80 ppm时，SMY、SMP和EPS急剧下降。结果证实了厌氧微生物在中温条件下从废水中去除苯乙烯和生产沼气方面表现良好。
