Effects of Ion Combinations and Their Concentrations on Denitrification Performance and Gene Expressions of an Aerobic Strain Marinobacter Hydrocarbonoclasticus RAD-2
文献类型： 外文期刊
作者： Li, Junchi 1 ; Cai, Lei 3 ; Lu, Huifeng 4 ; Ma, Bin 5 ; Chen, Guangsuo 2 ; Kong, Dedong 6 ; Hu, Yiming 1 ; Ye, Ziran 6 ; Ruan, Yunjie 1 ;
作者机构： 1.Zhejiang Univ, Inst Agr Bio Environm Engn, Coll Bio Syst Engn & Food Sci, Hangzhou 310058, Peoples R China
2.Zhejiang Univ, Rural Dev Acad, Hangzhou 310058, Peoples R China
3.Zhejiang Gongshang Univ, Coll Food Sci & Biotechnol, Lab Microbial Resources, Hangzhou 310035, Peoples R China
4.Zhejiang Univ, Coll Environm & Resource Sci, Dept Environm Engn, Hangzhou 310058, Peoples R China
5.Zhejiang Univ, Inst Soil & Water Resources & Environm Sci, Coll Environm & Resource Sci, Hangzhou 310058, Peoples R China
6.Zhejiang Acad Agr Sci, Inst Digital Agr, Hangzhou 310021, Peoples R China
关键词： aerobic denitrification; ion combinations; salinity; Marinobacter hydrocarbonoclasticus RAD-2; nitrogen-removal efficiency
期刊名称：MICROORGANISMS （ 影响因子：4.5； 五年影响因子：4.8 ）
ISSN：
年卷期： 2023 年 11 卷 8 期
页码：
收录情况： SCI
摘要： Salinity is one of the most important factors affecting the nitrogen-removal efficiency of denitrifying bacteria. A series of different ion combinations and salinity gradients were carried out to clarify the effects of ion types and concentrations on nitrogen removal by halophilic aerobic denitrifying bacteria RAD-2. Nitrate concentrations, nitrite concentrations, TAN concentrations, and OD600 were monitored to investigate their effects on denitrification in each group. The results showed that Na+, K+, and Cl- accelerated the denitrification process and improved nitrogen-removal efficiency at moderate additions, while Ca2+ and Mg2+ showed no significant effect. Na+ was effective alone, while K+ or Cl- needed to be combined with at least one of Na+, K+, or Cl- to achieve similar efficiency. The batch tests of salinity confirmed that the addition of a moderate concentration of NaCl/Na2SO4 could effectively improve nitrogen-removal efficiency, while excessive salinity might hinder denitrification metabolism. In the salinity range of 5 similar to 40 parts per thousand, a 5 parts per thousand dosage might be the most economical method for strain RAD-2. Real-time PCR experiments on 17 key nitrogen metabolism-related genes revealed that chloride was widely involved in the nitrogen and carbon metabolism of microorganisms by altering cell osmotic pressure and opening ion channel proteins, thereby affecting the efficiency of denitrification. The results of this study may contribute to a better understanding of the different roles of various ions in aerobic denitrification and highlight the importance of salinity control in highly salted wastewater treatment.
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