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

doi:10.1016/j.cjche.2020.10.015

Chinese Journal of Chemical Engineering ›› 2021, Vol. 37 ›› Issue (9): 121-127.DOI: 10.1016/j.cjche.2020.10.015

• Biotechnology and Bioengineering • Previous Articles Next Articles

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

Cemile Şeyma Arzum Yapıcı¹, Dilan Toprak¹, Müjgan Yıldız¹, Sinan Uyanık^1,2, Yakup Karaaslan³, Deniz Uçar^1,2

1. Environmental Engineering Department, Engineering Faculty, Harran University, Sanliurfa 63100, Turkey;
2. Gap Renewable Energy and Energy Efficiency Center, Harran University, Sanliurfa 63100, Turkey;
3. General Directorate of Water Management, Republic of Turkey Ministry of Agriculture and Forestry Beştepe Mahallesi, Yenimahalle 06560, Turkey

Received:2020-04-09 Revised:2020-09-10 Online:2021-11-02 Published:2021-09-28
Contact: Deniz Uçar
Supported by:
This work was supported by Harran University Scientific Research Projects Coordination Unit (HUBAP, project no 18018).

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

Cemile Şeyma Arzum Yapıcı¹, Dilan Toprak¹, Müjgan Yıldız¹, Sinan Uyanık^1,2, Yakup Karaaslan³, Deniz Uçar^1,2

1. Environmental Engineering Department, Engineering Faculty, Harran University, Sanliurfa 63100, Turkey;
2. Gap Renewable Energy and Energy Efficiency Center, Harran University, Sanliurfa 63100, Turkey;
3. General Directorate of Water Management, Republic of Turkey Ministry of Agriculture and Forestry Beştepe Mahallesi, Yenimahalle 06560, Turkey

通讯作者: Deniz Uçar
基金资助:
This work was supported by Harran University Scientific Research Projects Coordination Unit (HUBAP, project no 18018).

Abstract

Abstract: In this study, a sequential process (heterotrophic up-flow column and completely mixed membrane bioreactors) was proposed combining advantages of the both processes. The system was operated for 249 days with simulated and real groundwater for nitrate removal at concentrations varying from 25 to 145 mg·L^-1 NO₃^--N. The contribution of heterotrophic process to total nitrate removal in the system was controlled by dozing the ethanol considering the nitrate concentration. By this way, sulfur based autotrophic denitrification rate was decreased and the effluent sulfate concentrations were controlled. The alkalinity requirement in the autotrophic process was produced in the heterotrophic reactor, and the system was operated without alkalinity supplementation. Throughout 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% reduction. In the last period of the study, the real groundwater containing 145 mg·L^-1 NO₃^--N was completely removed. Membrane was operated without chemical washing in the first 114 days. Between days 115-249 weekly chemical washing was required.

Key words: Nitrate removal, Bioreactor, Bioprocess, Anaerobic process, Groundwater treatment

摘要： In this study, a sequential process (heterotrophic up-flow column and completely mixed membrane bioreactors) was proposed combining advantages of the both processes. The system was operated for 249 days with simulated and real groundwater for nitrate removal at concentrations varying from 25 to 145 mg·L^-1 NO₃^--N. The contribution of heterotrophic process to total nitrate removal in the system was controlled by dozing the ethanol considering the nitrate concentration. By this way, sulfur based autotrophic denitrification rate was decreased and the effluent sulfate concentrations were controlled. The alkalinity requirement in the autotrophic process was produced in the heterotrophic reactor, and the system was operated without alkalinity supplementation. Throughout 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% reduction. In the last period of the study, the real groundwater containing 145 mg·L^-1 NO₃^--N was completely removed. Membrane was operated without chemical washing in the first 114 days. Between days 115-249 weekly chemical washing was required.

关键词: Nitrate removal, Bioreactor, Bioprocess, Anaerobic process, Groundwater treatment

Cemile Şeyma Arzum Yapıcı, Dilan Toprak, Müjgan Yıldız, Sinan Uyanık, Yakup Karaaslan, Deniz Uçar. A combo technology of autotrophic and heterotrophic denitrification processes for groundwater treatment[J]. Chinese Journal of Chemical Engineering, 2021, 37(9): 121-127.

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

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

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