[Feasibility of treatment of landfill leachates by external loop three phase fluidized bed-constructed wetland system].
In this study, the system composed with the external loop fluidized bed reactor and constructed wetland was used to treat the landfill leachate. The change of water quality for the landfill leachate treated by this system was investigated. The experimental results indicated that the COD and NH4(+) -N of the influent reduced from 4000 mg x L(-1) and 300 mg x L(-1) to 1 500 mg x L(-1) and 150 mg x L(-1) after the external loop three phase fluidized bed reactor and steady at 200 mg x L(-1) and 10 mg x L(-1) behind treated by the constructed wetland. The heavy metals of Cd, Zn, Pb were also reduced for treatment by external loop three phase fluidized bed reactor. They were steady at 0.01 mg x L(-1), 0.5 mg x L(-1), 0.1 mg x L(-1) from 0.12 mg x L(-1), 3.0 mg x L(-1), 1.4 mg x L(-1) because of the constructed wetland. We also compared the different plants for the efficiency, the results showed that whatever plants, there was little effects on the efficiency of the COD and NH4(+) -N, but the effect of heavy metal was markedness.
Zhang
Jin-Sheng
JS
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China. jecalsamy@163.com
Yuan
Xing-Zhong
XZ
Zeng
Guang-Ming
GM
Dong
Bei-Bei
BB
Liang
Yun-Shan
YS
D001673:Biodegradation, Environmental; D019149:Bioreactors; D005240:Feasibility Studies; D019216:Metals, Heavy / Q000032:analysis / Q000378:metabolism; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism; D012037:Refuse Disposal / Q000379:methods*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014872:Water Movements; D018508:Water Purification / Q000379:methods; D053833:Wetlands
D019216:Metals, Heavy; D009584:Nitrogen