Process Safety and Environmental Protection ( IF 7.8 ) Pub Date : 2021-04-23 , DOI: 10.1016/j.psep.2021.04.020 Lichao Lu , Zenab Tariq Baig , Dong Dong , Jinying Xi
Gas-phase fluidized-beds reactor (FBR) can overcome the shortages of bed clogging and performance decline in packed-bed reactors on VOCs treatment. Ideal FBR packing materials with minimum fluidized velocity and surface characteristics are required. In this study, an expanded polystyrene (EPS) with particle size 1.0–2.0 mm was selected as the skeleton among six types of EPS and two types of expanded polypropylene (EPP). They were then physically coated with a combination of potato dextrose medium, fine wheat bran particles, and inorganic glue. Different glue concentrations and amounts of medium were tested and the optimal values of 2 % and 0.22 g∙cm−2 were achieved. The wheat-coated EPS obtained hydrophilic functional groups on the surface, and its contact angle decreased from 93° to 37° after coating. By scanning electronic microscopy, more microorganisms were observed on the surface of the coated EPS than that of the uncoated EPS. A lab-scale fluidized bioreactor was built to treat gaseous ethanol. The minimum fluidized velocity of coated packing materials was 0.2 m∙s−1 under a relative humidity of 50 ± 10 %, reaching an average elimination capacity of 681 g m-3 h−1 during the 28-days operation, while the bioreactor packed with uncoated EPS reached only 18 g m−3 h−1.
中文翻译:
新型气相流化床生物反应器填料的制备与表征
气相流化床反应器(FBR)可以克服VOC处理后填充床反应器中床堵塞的不足和性能下降的问题。需要具有最小流化速度和表面特性的理想FBR填料。在这项研究中,从六种类型的EPS和两种类型的膨胀聚丙烯(EPP)中选择了粒径为1.0-2.0 mm的膨胀聚苯乙烯(EPS)作为骨架。然后将它们用马铃薯葡萄糖培养基,细麦麸颗粒和无机胶的混合物进行物理涂覆。测试了不同的胶水浓度和介质量,最佳值为2%和0.22 g∙cm -2实现了。小麦包覆的EPS在表面上获得了亲水性官能团,包覆后的接触角从93°降低到37°。通过扫描电子显微镜,与未涂布的EPS相比,在涂布的EPS的表面上观察到更多的微生物。建立了实验室规模的流化生物反应器来处理气态乙醇。涂覆的包装材料的最小流化速度为0.2μm∙小号-1 50±10%的相对湿度下,达到681克的平均消除容量-3 ħ -1 28天操作期间,而所述生物反应器填充有未涂布的EPS仅为18 gm -3 h -1。