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Enhanced performance of “Candidatus Brocadia sinica” treating nitrogen-laden saline wastewater resulting from sorbitol addition: Enzyme activities and kinetics
Desalination ( IF 9.9 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.desal.2019.114304
Lijing Bai , Jin Li , Basanta Kumar Biswal , Guanghao Chen

Abstract Nitrogen removal performance and key enzyme activities of “Candidatus Brocadia sinica” with sorbitol addition were investigated in nitrogen-laden saline wastewater treatment. Nitrogen removal through “Candidatus Brocadia sinica” first increased and then decreased with sorbitol addition. Optimal ammonia removal rate and nitrite removal rate were 0.53 and 0.67 kg/(m3·d) at 0.8 mM sorbitol, which increased by 39.5% and 71.8%, respectively. Moreover, appropriate sorbitol content could resist salt stress and decrease extracellular polymeric substances content of “Candidatus Brocadia sinica”. Independent of sorbitol concentration, hydrazine dehydrogenase and nitrite reductase activities were enhanced about 1.37–2.36 folds. Remodified Logistic model was the most appropriate to analyze nitrogen removal process with sorbitol addition. Fitted Rmax (%/h) could be converted into Vmax (kg/(m3·d)) to predict optimal substrate conversion rates of “Candidatus Brocadia sinica” treating nitrogen-laden saline wastewater with various sorbitol contents.

中文翻译:

“Candidatus Brocadia sinica”处理山梨醇添加产生的含氮含盐废水的性能增强:酶活性和动力学

摘要 研究了山梨糖醇添加后“西洋参”在含氮含盐废水处理中的脱氮性能和关键酶活性。随着山梨糖醇的加入,通过“Candidatus Brocadia sinica”去除的氮首先增加然后减少。最佳氨去除率和亚硝酸盐去除率在 0.8 mM 山梨糖醇下分别为 0.53 和 0.67 kg/(m3·d),分别提高了 39.5% 和 71.8%。此外,适当的山梨糖醇含量可以抵抗盐胁迫,降低“中华白菜”的胞外聚合物含量。与山梨糖醇浓度无关,肼脱氢酶和亚硝酸还原酶活性提高了约 1.37-2.36 倍。修正Logistic模型最适合分析山梨糖醇添加的脱氮过程。
更新日期:2020-03-01
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