title: Analysis of chemical reaction kinetics of depredating organic pollutants from secondary effluent of wastewater treatment plant in constructed wetlands.
abstract: Four subsurface constructed wetlands were built to treat the secondary effluent of a wastewater treatment plant in Tangshan, China. The chemical pollutant indexes of chemical oxygen demand (COD) were analyzed to evaluate the removal efficiency of organic pollutants from the secondary effluent of the wastewater treatment plant. In all cases, the subsurface constructed wetlands were efficient in treating organic pollutants. Under the same hydraulic loading condition, the horizontal flow wetlands exhibited better efficiency of COD removal than vertical flow wetlands: the removal rates in horizontal flow wetlands could be maintained at 68.4 ± 2.42% to 92.2 ± 1.61%, compared with 63.8 ± 1.19% to 85.0 ± 1.25% in the vertical flow wetlands. Meanwhile, the chemical reaction kinetics of organic pollutants was analyzed, and the results showed that the degradation courses of the four subsurface wetlands all corresponded with the first order reaction kinetics to a large extent.
authors.affiliation: College of Civil and Architecture Engineering, Hebei United University, Tangshan, China. wanghao1689@gmail.com
authors.forename: Hao
authors.initials: H
authors.lastname: Wang
authors.forename: Dengling
authors.initials: D
authors.lastname: Jiang
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.forename: Guoping
authors.initials: G
authors.lastname: Cao
mesh_terms: D057919:Biological Oxygen Demand Analysis; D003198:Computer Simulation; D007700:Kinetics; D009930:Organic Chemicals / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*; D053833:Wetlands; D017641:Zeolites / Q000737:chemistry
chemical_list: D009930:Organic Chemicals; D062065:Wastewater; D014874:Water Pollutants, Chemical; D017641:Zeolites