Shamir Research Institute, University of Haifa, Qatzrin, Israel.
Faculty of Sciences and Technology, Tel Hai College, Upper Galilee, Israel.
Environ Technol. 2020 Sep;41(22):2875-2883. doi: 10.1080/09593330.2019.1587005. Epub 2019 Mar 11.
The aim of the study was to evaluate the performance of batch and semi-continuous treatment systems for phenol degradation using a consortium of bacterial cultures that were encapsulated using the 'Small Bioreactor Platform' (SBP) encapsulation method. The maximal phenol biodegradation rate was 22 and 48 mg/L/h at an initial phenol concentration of 100 and 1000 mg/L in the batch and semi-continuous bioreactors, respectively. The initial phenol concentration played an important role in the degradation efficiency rates. The batch bioreactor results could be described by the Haldane model, where the degradation rate decreased under low as well as under very high initial phenol concentrations. Concentration equalization between the two sides of the SBP capsule's membrane occurred after 80 min. The microfiltration membrane is perforated with holes that have an average diameter of 0.2-0.7 µm. It is therefore suggested that the capsule's membrane is more permeable compared to other polymeric matrixes used for bacterial encapsulation (such as alginate). This study shows that the encapsulation of phenol degraders within microfiltration-membrane capsules which create a confined environment has a potential for enhancing phenol removal in phenol-rich wastewaters.
本研究旨在评估使用细菌培养物混合物进行批处理和半连续处理系统对苯酚降解的性能，这些细菌培养物混合物使用“小型生物反应器平台”（SBP）包封方法进行包封。在初始苯酚浓度分别为 100 和 1000 mg/L 的批式和半连续生物反应器中，苯酚的最大生物降解速率分别为 22 和 48 mg/L/h。初始苯酚浓度对降解效率有重要影响。批式生物反应器的结果可以用 Haldane 模型来描述，其中在低初始苯酚浓度和非常高初始苯酚浓度下，降解速率都会降低。SBP 胶囊膜两侧的浓度均衡在 80 分钟后发生。微滤膜上有孔，平均直径为 0.2-0.7 µm。因此，与用于细菌包封的其他聚合基质（如海藻酸盐）相比，建议胶囊膜具有更高的渗透性。本研究表明，在微滤膜胶囊内包封苯酚降解菌，创造一个受限的环境，有可能提高富含苯酚的废水中苯酚的去除率。
