Jacobs Pieter, De Bo Inge, Demeestere Kristof, Verstraete Willy, Van Langenhove Herman
Research Group EnVOC, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium.
Biotechnol Bioeng. 2004 Jan 5;85(1):68-77. doi: 10.1002/bit.10839.
In this report, gaseous toluene biodegradation results in a flat composite membrane reactor inoculated with Pseudomonas putida TVA8 are presented. Preliminary abiotic experiments showed that transport of toluene through the membrane was linearly and negatively correlated with the gas residence time (tau). During a 339-day biofiltration experiment, the influence of gas residence time (2-24 sec) and mass loading rate (B(v); 10-483 g x m(-3) h(-1)) on the toluene elimination capacity was investigated. A maximum elimination capacity (EC(max)) of 397 g x m(-3) h(-1) was achieved at tau = 24 sec and B(v) = 473 g x m(-3) h(-1). Expressed per unit membrane area, the EC(m,max) was 0.793 g x m(-2) h(-1), which is five times higher than results obtained with other membrane bioreactor experiments in the same range of loading rates. At low gas residence times, reactor performance was limited by mass transfer. Toluene concentration profiles along the membrane were measured for several biotic and abiotic conditions. For inlet concentrations (C(in)) up to 1 g x m(-3), more than 90% was eliminated at 15 cm from the reactor inlet. For C(in) > 1.65 g x m(-3), longer membranes are necessary to obtain these high removal efficiencies.
本报告介绍了在接种恶臭假单胞菌TVA8的平板复合膜反应器中气态甲苯的生物降解结果。初步的非生物实验表明，甲苯透过膜的传输与气体停留时间（τ）呈线性负相关。在为期339天的生物过滤实验中，研究了气体停留时间（2 - 24秒）和质量负荷率（B(v)；10 - 483 g·m⁻³·h⁻¹）对甲苯去除能力的影响。在τ = 24秒和B(v) = 473 g·m⁻³·h⁻¹时，实现了最大去除能力（EC(max)）为397 g·m⁻³·h⁻¹。以单位膜面积表示，EC(m,max)为0.793 g·m⁻²·h⁻¹，这比在相同负荷率范围内其他膜生物反应器实验得到的结果高五倍。在低气体停留时间下，反应器性能受传质限制。针对几种生物和非生物条件测量了沿膜的甲苯浓度分布。对于高达1 g·m⁻³的入口浓度（C(in)），在距反应器入口15厘米处超过90%的甲苯被去除。对于C(in) > 1.65 g·m⁻³，需要更长的膜才能获得这些高去除效率。
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