Impacts of vegetation and temperature on the treatment of domestic sewage in constructed wetlands incorporated with Ferric-Carbon micro-electrolysis material.
Ferric-Carbon Micro-Electrolysis (Fe/C-M/E) material had been widely used for the pretreatment of wastewater. Therefore, we hypothesized that Fe/C-M/E material could enhance the treatment of domestic sewage when it was integrated into constructed wetlands (CWs). In this study, CWs integrated with Fe/C-M/E material were developed. Druing the experiment of effect of vegetation on the performance of CWs, percentages of NH4+-N, NO3--N, total nitrogen (TN), and Chemical Oxygen Demand (COD) removed in polyculture (W1) were up to 91.8%, 97.0%, 92.3%, and 85.4%, respectively, which were much higher than those in Lythrum salicaria monoculture (W2) and Canna indica monoculture (W3). In the experiment of temperature influences on the removal efficiency of CWs, temperature substantially influenced the performance of CWs. For example, NO3--N removal percentages of W1, W2, and W3 at high temperature (25.5°C and 19.8°C) were relatively stable and greater than 85.4%. At 8.9°C, however, a sharp decline of NO3--N removal percentage was observed in all CWs. Temperature also influenced the Chemical Oxygen Demand (COD) removal and soil microbial activity and biomass. Overall, the polyculture (Lythrum salicaria +Canna indica) showed the best performance during most of the operating time, at an average temperature ≥ 19.8°C, due to the functional complementarity between vegetation. All the CWs consistently achieved high removal efficiency (above 96%) for TP in all experiments, irrespective of vegetation types, phosphorous loadings, and temperatures. In conclusion, polyculture was an attractive solution for the treatment of domestic sewage during most of the operating time (average temperature ≥ 19.8°C). Furthermore, CWs with Fe/C-M/E material were ideally suitable for domestic sewage treatment, especially for TP removal.
a Key Laboratory of Wetland Ecology and Environment , Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences , Changchun , P.R. China.|b University of the Chinese Academy of Sciences , Beijing , P.R. China.
Qingwei
Q
Zhou
a Key Laboratory of Wetland Ecology and Environment , Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences , Changchun , P.R. China.
Hui
H
Zhu
c USDA, Agricultural Research Service, San Joaquin Valley Agricultural Science Center , Parlier , CA , USA.
Gary
G
Bañuelos
a Key Laboratory of Wetland Ecology and Environment , Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences , Changchun , P.R. China.
Baixing
B
Yan
a Key Laboratory of Wetland Ecology and Environment , Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences , Changchun , P.R. China.|b University of the Chinese Academy of Sciences , Beijing , P.R. China.
Yinxiu
Y
Liang
a Key Laboratory of Wetland Ecology and Environment , Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences , Changchun , P.R. China.
Jing
J
Yu
a Key Laboratory of Wetland Ecology and Environment , Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences , Changchun , P.R. China.
Huai
H
Li
D001673:Biodegradation, Environmental; D002244:Carbon; D004572:Electrolysis; D009584:Nitrogen; D012722:Sewage; D013696:Temperature; D014865:Waste Disposal, Fluid; D053833:Wetlands
D012722:Sewage; D002244:Carbon; D009584:Nitrogen
Fe/C-M/E material; constructed wetlands; rhizosphere microorganism; temperature; vegetation types