title: [Treatment of 1, 2-dichlorobenzene in wastewater by using horizontal subsurface flow constructed wetlands].
abstract: Pilot-scale horizontal subsurface flow constructed wetlands (SFCW) planted with Phragmites australis were constructed to treat in 1,2-dichlorobenzene (o-DCB) wastewater. Different soil substrates of loam (W-L), fine sand (W-F) and coarse sand (W-C) were used in the three SFCW and a loam wetland with no reeds W-Z was taken as control. Results showed that the optimal hydraulic retention time (HRT) and pollutants surface loading rate(ALR)were 5 d and 150 mg x (m2 x d)(-1). Removal efficiencies for o-DCB of W-L, W-F, W-C and W-Z were 81.2%, 71.1%, 72.4% and 65.2%, respectively. The performance of systems achieved in mid-August and declined from October, with order of W-L > W-C > W-Z > W-F. Spatial concentration dynamics of o-DCB and dissolved oxygen (DO) were also investigated in W-L and W-Z, which indicated that DO was an important role to removal of o-DCB. The residual quantity of o-DCB in wetland substrate decreased along the flow direction and increased with the depth of substrate layers, the mean residual in the root, stem and leaf of reeds were 30.28, 14.85 and 6.18 microg x g(-1).
authors.affiliation: College of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China. ycdingc@163.com
authors.forename: Cheng
authors.initials: C
authors.lastname: Ding
authors.forename: Tang-Yi
authors.initials: TY
authors.lastname: Yang
authors.forename: Qian
authors.initials: Q
authors.lastname: Yu
authors.forename: Zhao-Xia
authors.initials: ZX
authors.lastname: Li
authors.forename: Chun-Sheng
authors.initials: CS
authors.lastname: Yang
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D002722:Chlorobenzenes / Q000302:isolation & purification*; D003198:Computer Simulation; D006109:Poaceae / Q000378:metabolism; D012987:Soil / Q000737:chemistry; D013379:Substrate Specificity; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D053833:Wetlands
chemical_list: D002722:Chlorobenzenes; D012987:Soil; D014874:Water Pollutants, Chemical; C004726:2-dichlorobenzene