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Advanced biodegradation process of atrazine in the peroxidase-mediated sequencing batch reactor (SBR) and moving-bed SBR (MSBR): mineralization and detoxification
Journal of Environmental Health Science and Engineering ( IF 3.4 ) Pub Date : 2020-10-24 , DOI: 10.1007/s40201-020-00471-2
Hossain Momeni Nejad 1 , Gholamreza Moussavi 1
Affiliation  

The advanced biodegradation process of atrazine was stimulated with hydrogen peroxide (H2O2) in a sequencing batch reactor (SBR) under different operational conditions due to in situ generation of H2O2-peroxidase. The complete biodegradation and mineralization of 50 mg/L atrazine was achieved in the SBR with a biomass concentration of 328 mg/L stimulated with 10 mM of H2O2. The presence of H2O2 in the SBR induced the generation of H2O2-peroxidase resulted in acceleration of atrazine biodegradation. Adding moving media to the SBR system and converting it to the MSBR considerably improved the rate of atrazine biodegradation and mineralization under H2O2 mediation. The highest specific utilization rate of atrazine in the SBR operated at the biomass concentration of 55 mg/L was 19.4 mg/gbiomass.h, while it was 33.5 mg/gbiomass.h in the MSBR operated at the biomass concentration of 37 mg/L. The low ATZ removal along with no peroxidase activity in the bioreactor in absence of H2O2 clearly ideated that the biodegradation and mineralization of ATZ was considerably mediated by H2O2-peroxidase enzyme. The toxicity of atrazine solution decreased markedly when treated in the MSBR under optimum conditions. Accordingly, the MSBR stimulated with H2O2 is an efficient and thus promising process for biodegradation of recalcitrant compounds.



中文翻译:

阿特拉津在过氧化物酶介导的批量反应器 (SBR) 和移动床 SBR (MSBR) 中的高级生物降解过程:矿化和解毒

由于 H 2 O 2过氧化物酶的原位生成,在不同的操作条件下,在序批式反应器 (SBR) 中用过氧化氢 (H 2 O 2 )刺激了莠去津的高级生物降解过程。在 SBR 中实现了 50 mg/L 莠去津的完全生物降解和矿化,在 10 mM H 2 O 2刺激下,生物质浓度为 328 mg/L 。SBR中 H 2 O 2的存在诱导了 H 2 O 2 的产生-过氧化物酶导致莠去津生物降解加速。将移动介质添加到 SBR 系统并将其转化为 MSBR 显着提高了在 H 2 O 2介导下阿特拉津生物降解和矿化的速率。以 55 mg/L 生物质浓度运行的 SBR 中莠去津的最高比利用率为 19.4 mg/g生物质.h,而在 37 mg 生物质浓度下运行的 MSBR中阿特拉津的最高比利用率为 33.5 mg/g生物质.h /L。在不存在 H 2 O 2 的情况下,生物反应器中的低 ATZ 去除以及无过氧化物酶活性清楚地表明 ATZ 的生物降解和矿化在很大程度上是由 H 2 O 2介导的-过氧化物酶。在最佳条件下在 MSBR 中处理阿特拉津溶液的毒性显着降低。因此,用H 2 O 2刺激的MSBR是用于顽固化合物生物降解的有效且因此有前途的方法。

更新日期:2020-10-27
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