TY - JOUR
T1 - Solar-driven, self-sustainable electrolysis for treating eutrophic river water
T2 - Intensified nutrient removal and reshaped microbial communities
AU - Liu, Huaqing
AU - Kong, Tianle
AU - Qiu, Lang
AU - Xu, Rui
AU - Li, Fangbai
AU - Kolton, Max
AU - Lin, Hanzhi
AU - Zhang, Lei
AU - Lin, Lan
AU - Chen, Jiazhi
AU - Sun, Xiaoxu
AU - Gao, Pin
AU - Sun, Weimin
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/4/10
Y1 - 2021/4/10
N2 - River ecosystems are the most important resource of surface freshwater, but they have frequently been contaminated by excessive nutrient input of nitrogen (N) and phosphorus (P) in particular. An efficient and economic river water treatment technology that possesses the capacity of simultaneous N and P removal is urgently required. In this study, a solar-driven, self-sustainable electrolytic treatment was conducted in situ to intensify N and P removal from eutrophic river water. Solar panel was applied to provide the electrolysis setups with energy (voltage 10 ± 0.5 V), and the current density was controlled to be 0.06 ± 0.02 mA cm−2. Results indicated that the average removal efficiencies of total N (TN) and total P (TP) under electrolysis conditions reached 72.4 ± 11.7 and 13.8 ± 5.3 mg m−2 d−1, which were 3.7- and 4.7-fold higher compared to untreated conditions. Enhanced TN removal mainly reflected the abatement of nitrate N (NO3−-N) (80.6 ± 4.1%). The formation of ferric ions through the electro-dissolution of the sacrificial iron anode improved TP removal by coprecipitation with SPS. Combined high-throughput sequencing and statistical analyses revealed that electrolysis significantly reshaped the microbial communities in both the sediment-water interface and suspended sediment (SPS), and hydrogenotrophic denitrifiers (e.g., Hydrogenophaga) were highly enriched under electrolysis conditions. These findings indicated that in situ electrolysis is a feasible and effective technology for intensified nutrient removal from river water.
AB - River ecosystems are the most important resource of surface freshwater, but they have frequently been contaminated by excessive nutrient input of nitrogen (N) and phosphorus (P) in particular. An efficient and economic river water treatment technology that possesses the capacity of simultaneous N and P removal is urgently required. In this study, a solar-driven, self-sustainable electrolytic treatment was conducted in situ to intensify N and P removal from eutrophic river water. Solar panel was applied to provide the electrolysis setups with energy (voltage 10 ± 0.5 V), and the current density was controlled to be 0.06 ± 0.02 mA cm−2. Results indicated that the average removal efficiencies of total N (TN) and total P (TP) under electrolysis conditions reached 72.4 ± 11.7 and 13.8 ± 5.3 mg m−2 d−1, which were 3.7- and 4.7-fold higher compared to untreated conditions. Enhanced TN removal mainly reflected the abatement of nitrate N (NO3−-N) (80.6 ± 4.1%). The formation of ferric ions through the electro-dissolution of the sacrificial iron anode improved TP removal by coprecipitation with SPS. Combined high-throughput sequencing and statistical analyses revealed that electrolysis significantly reshaped the microbial communities in both the sediment-water interface and suspended sediment (SPS), and hydrogenotrophic denitrifiers (e.g., Hydrogenophaga) were highly enriched under electrolysis conditions. These findings indicated that in situ electrolysis is a feasible and effective technology for intensified nutrient removal from river water.
KW - Coprecipitation
KW - Electrolytic treatment
KW - Microbial community characterization
KW - Nitrogen and phosphorus removal
KW - Solar-driven self-sustainable
KW - Suspended sediment
UR - http://www.scopus.com/inward/record.url?scp=85098474217&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2020.144293
DO - 10.1016/j.scitotenv.2020.144293
M3 - Article
C2 - 33385655
AN - SCOPUS:85098474217
SN - 0048-9697
VL - 764
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 144293
ER -
