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A combo technology of autotrophic and heterotrophic denitrification processes for groundwater treatment

Chinese Journal of Chemical Engineering 2021年第9期34卷 121-127页

作者： Cemile Seyma Arzum Yapıcı Dilan Toprak Müjgan Yıldız Sinan Uyanık yakup karaaslan Deniz Uçar Environmental Engineering Department Engineering FacultyHarran UniversitySanliurfa 63100Turkey Gap Renewable Energy and Energy Efficiency Center Harran UniversitySanliurfa 63100Turkey General Directorate of Water Management Republic of Turkey Ministry of Agriculture and Forestry Bestepe MahallesiYenimahalle 06560Turkey

In this study,a sequential process(heterotrophic up-flow column and completely mixed membrane bioreactors)was proposed combining advantages of the both *** system was operated for 249 days with simulated and real groundwater for nitrate removal at concentrations varying from 25 to 145 mg·L^(-1) NO_(3)^(-)-*** contribution of heterotrophic process to total nitrate removal in the system was controlled by dozing the ethanol considering the nitrate *** this way,sulfur based autotrophic denitrification rate was decreased and the effluent sulfate concentrations were *** alkalinity requirement in the autotrophic process was produced in the heterotrophic reactor,and the system was operated without alkalinity *** the study,the chemical oxygen demand in the heterotrophic reactor effluent was(23.7±22)mg L^(-1) and it was further decreased to(7.5±7.2)mg·L^(-1) in the system effluent,corresponding to a 70%*** the last period of the study,the real groundwater containing 145 mg·L^(-1) NO_(3)^(-)-N was completely *** was operated without chemical washing in the first 114 *** days 115-249 weekly chemical washing was required.

关键词： Nitrate removal Bioreactor Bioprocess Anaerobic process Groundwater treatment

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