TY - JOUR
T1 - Enhanced chromium(VI) treatment in electroactive constructed wetlands
T2 - influence of conductive material
AU - Srivastava, Pratiksha
AU - Abbassi, Rouzbeh
AU - Kumar Yadav, Asheesh
AU - Garaniya, Vikram
AU - Kumar, Naresh
AU - Khan, Stuart J.
AU - Lewis , Trevor
PY - 2020/4/5
Y1 - 2020/4/5
N2 - A constructed wetland (CW) microcosm based on conductive graphite gravel was investigated for hexavalent chromium (Cr(VI)) treatment from synthetic wastewater. Its performance was evaluated and compared with a traditional gravel-based CW microcosm. The microcosms were operated at varying initial Cr(VI) concentrations (5−20 mg/L) and hydraulic retention times (HRT) (3–7.5 h). Near complete treatment (99.9 ± 0.06 %) was achieved in the graphite-based microcosm throughout the experiment. The performance was consistently high throughout with 42.9 % improvement in Cr (VI) treatment compared to a traditional gravel microcosm. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) analysis indicated that chromium was adsorbed to microbial biofilms. Moreover, microbial diversity profiling suggested that the microbial population in both microcosms differed in diversity and communities. The results suggest that the use of conductive materials in CW significantly enhances the treatment of Cr(VI) and more importantly, allows microbial activity even at high levels of Cr(VI) in the CW.
AB - A constructed wetland (CW) microcosm based on conductive graphite gravel was investigated for hexavalent chromium (Cr(VI)) treatment from synthetic wastewater. Its performance was evaluated and compared with a traditional gravel-based CW microcosm. The microcosms were operated at varying initial Cr(VI) concentrations (5−20 mg/L) and hydraulic retention times (HRT) (3–7.5 h). Near complete treatment (99.9 ± 0.06 %) was achieved in the graphite-based microcosm throughout the experiment. The performance was consistently high throughout with 42.9 % improvement in Cr (VI) treatment compared to a traditional gravel microcosm. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) analysis indicated that chromium was adsorbed to microbial biofilms. Moreover, microbial diversity profiling suggested that the microbial population in both microcosms differed in diversity and communities. The results suggest that the use of conductive materials in CW significantly enhances the treatment of Cr(VI) and more importantly, allows microbial activity even at high levels of Cr(VI) in the CW.
KW - Constructed wetland
KW - Electro-wetland
KW - Bioelectrochemical systems
KW - Chromium treatment
KW - Electron transfer
UR - http://www.scopus.com/inward/record.url?scp=85076611156&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2019.121722
DO - 10.1016/j.jhazmat.2019.121722
M3 - Article
C2 - 31806439
SN - 0304-3894
VL - 387
SP - 1
EP - 12
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 121722
ER -