TY - JOUR
T1 - Modeling an in-situ hydrogenotrophic denitrification and oxidation process in an experimental scale aquifer
AU - Inagaki, Yoshihiko
AU - Naito, Katsuki
AU - Ye, Jian
AU - Komori, Masahito
AU - Sakakibara, Yutaka
N1 - Funding Information:
The authors appreciate the kind support from the students in Dr. Sakakibara’s research group, Department of Civil and Environmental Engineering, School of Creative Science and Engineering, Waseda University. We would like to thank Editage ( www.editage.jp ) for English language editing. This work was supported financially by Waseda University, Japan (No. RI 0000250968). Any findings expressed in this study do not reflect the views of Waseda University. The funding source was not involved in study design; in data collection and analysis; and in the decision to submit the paper for publication.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/12
Y1 - 2018/12
N2 - This paper presents a mathematical model for an in-situ hydrogenotrophic denitrification and oxidation process in an experimental scale aquifer. This model was developed to investigate the stable denitrification performance of the aquifer as well as the effects of varying the molar ratio of nitrate load to hydrogen gas injection (N/H ratio) on the effluent quality in terms of nitrate and nitrite concentrations under a long-term operation. The model could fairly predict the effluent quality in terms of nitrate and nitrite concentrations in the aquifer, in response to the sudden decrease in H2 gas injection as well as different N/H ratios. Furthermore, the model clearly demonstrated that denitrification and nitrification proceeded in each zone injected with H2 gas or O2 gas, respectively, and that stable treatment can be achieved. There were some differences between the experimental data and the model results for nitrate, nitrite, dissolved oxygen, and dissolved hydrogen at the H2-injection zone, implying that mass transfer rates in biofilm should be taken into consideration for more precise modeling. A sensitivity analysis showed that effluent quality in terms of nitrate concentration was the most sensitive to changes in maximum nitrate and nitrite utilization rates.
AB - This paper presents a mathematical model for an in-situ hydrogenotrophic denitrification and oxidation process in an experimental scale aquifer. This model was developed to investigate the stable denitrification performance of the aquifer as well as the effects of varying the molar ratio of nitrate load to hydrogen gas injection (N/H ratio) on the effluent quality in terms of nitrate and nitrite concentrations under a long-term operation. The model could fairly predict the effluent quality in terms of nitrate and nitrite concentrations in the aquifer, in response to the sudden decrease in H2 gas injection as well as different N/H ratios. Furthermore, the model clearly demonstrated that denitrification and nitrification proceeded in each zone injected with H2 gas or O2 gas, respectively, and that stable treatment can be achieved. There were some differences between the experimental data and the model results for nitrate, nitrite, dissolved oxygen, and dissolved hydrogen at the H2-injection zone, implying that mass transfer rates in biofilm should be taken into consideration for more precise modeling. A sensitivity analysis showed that effluent quality in terms of nitrate concentration was the most sensitive to changes in maximum nitrate and nitrite utilization rates.
KW - Groundwater
KW - In-situ hydrogenotrophic denitrification
KW - Mathematical model
KW - Nitrate removal
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U2 - 10.1016/j.jwpe.2018.11.002
DO - 10.1016/j.jwpe.2018.11.002
M3 - Article
AN - SCOPUS:85056240950
SN - 2214-7144
VL - 26
SP - 308
EP - 313
JO - Journal of Water Process Engineering
JF - Journal of Water Process Engineering
ER -