Experiment and multicomponent model based analysis on the effect of flow rate and nitrate concentration on denitrification in low-permeability media

Wang, Jiaqi1,2,3; Ma, Rui2,3; Guo, Zhilin1; Qu, Le2,3; Yin, Maosheng2,3; Zheng, Chunmiao1

2020-11-01

10.1016/j.jconhyd.2020.103727

JOURNAL OF CONTAMINANT HYDROLOGY   影响因子和分区

0169-7722

1873-6009

To better understand the combined effects of flow rate and NO3- concentration on denitrification rate and NO3- removal efficiency in the low-permeability media, a set of column experiments with different flow rates and injected NO3- concentrations were conducted. Denitrification processes under these different conditions were simulated using the PHREEQC code that couples the biogeochemical reactions and hydrological transport processes. In these reactive transport models, Monod kinetics were applied to describe the denitrification process. It was found that, among the experiments conducted in this study, the low flow rate (0.023 m/d) resulted in the low denitrification rate but high NO3- removal efficiency. Meanwhile, NO3- removal efficiency was the highest (85%) under moderate NO3- concentration of 1.29 mmol/L, although denitrification rate increased in response to the increase of N-O3(-) concentration. The model results also indicated that NO3- removal efficiency of 97% can be achieved with relatively low flow rate and high influent NO3- concentration. The results in this study provide insights into NO3- remediation, and the temporal and spatial flow rate, as well as NO3- concentration distribution, should be pre-evaluated for the effective removal strategies.

Denitrification Nitrate concentration Flow rate Column experiments Reactive transport modeling

SCI ; EI

英语

第一

National Natural Science Foundation of China[41722208,41521001,41330632] ; Natural Sciences Foundation of Hubei Province of China[2019CFA013] ; 111 Program (State Administration of Foreign Experts Affairs)[B18049] ; 111 Program (Ministry of Education of China)[B18049]

Environmental Sciences & Ecology ; Geology ; Water Resources

Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources

WOS:000596076400008

ELSEVIER

20204209354314

Denitrification ; Efficiency ; Flow rate

Fluid Flow:631 ; Chemical Reactions:802.2 ; Inorganic Compounds:804.2 ; Production Engineering:913.1 ; Mechanical Variables Measurements:943.2

ENVIRONMENT/ECOLOGY

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, State Environm Protect Key Lab Integrated Surface, Shenzhen 518055, Peoples R China
2.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China
3.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China

Wang, Jiaqi,Ma, Rui,Guo, Zhilin,et al. Experiment and multicomponent model based analysis on the effect of flow rate and nitrate concentration on denitrification in low-permeability media[J]. JOURNAL OF CONTAMINANT HYDROLOGY,2020,235.

Wang, Jiaqi,Ma, Rui,Guo, Zhilin,Qu, Le,Yin, Maosheng,&Zheng, Chunmiao.(2020).Experiment and multicomponent model based analysis on the effect of flow rate and nitrate concentration on denitrification in low-permeability media.JOURNAL OF CONTAMINANT HYDROLOGY,235.

Wang, Jiaqi,et al."Experiment and multicomponent model based analysis on the effect of flow rate and nitrate concentration on denitrification in low-permeability media".JOURNAL OF CONTAMINANT HYDROLOGY 235(2020).