title: Evaluation of nutrient removal efficiency and microbial enzyme activity in a baffled subsurface-flow constructed wetland system.
abstract: In this study, the enzyme activities and their relationships to domestic wastewater purification are investigated in four different types of subsurface-flow constructed wetlands (CWs), namely the traditional horizontal subsurface-flow, horizontal baffled subsurface-flow, vertical baffled subsurface-flow, and composite baffled subsurface-flow CWs. Results showed that the urease activity in the composite baffled subsurface-flow CW was significantly higher than in the other three CWs, while the phosphatase activity in the vertical baffled subsurface-flow CW were higher than in the other three CWs. There were significant and very significant correlations between the activities of urease and the removal rates of TN and NH4(+)-N for the horizontal baffled flow, horizontal subsurface flow, and composite baffled subsurface flow CWs. This study suggests that the activity of urease in the root zones of those three CWs is an important indicator for N purification from wastewaters.
authors: College of Natural Resource & Environment, South China Agricultural University, Guangzhou 510642, P.R. China. Electronic address: Lihcui@scau.edu.cn.
authors: Lihua
authors: L
authors: Cui
authors: USDA Forest Service, Center for Bottomland Hardwoods Research, 100 Stone Blvd., Thompson Hall, Room 309, Mississippi State, MS 39762, USA.
authors: Ying
authors: Y
authors: Ouyang
authors: Institute of Soil and Fertilizer, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, P.R. China.
authors: Wenjie
authors: W
authors: Gu
authors: College of Natural Resource & Environment, South China Agricultural University, Guangzhou 510642, P.R. China.
authors: Weizhi
authors: W
authors: Yang
authors: College of Natural Resource & Environment, South China Agricultural University, Guangzhou 510642, P.R. China.
authors: Qiaoling
authors: Q
authors: Xu
mesh_terms: D000641:Ammonia / Q000737:chemistry; D001673:Biodegradation, Environmental; D004798:Enzymes / Q000737:chemistry*; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry; D018517:Plant Roots / Q000378:metabolism; D012044:Regression Analysis; D013997:Time Factors; D014510:Urease / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods; D053833:Wetlands; D019862:Zingiberales / Q000378:metabolism
chemical_list: D000641:Ammonia; D004798:Enzymes; D009584:Nitrogen; D010758:Phosphorus; D014510:Urease; D062065:Wastewater; D014867:Water; D014874:Water Pollutants, Chemical
keywords: Baffled subsurface-flow; Constructed wetland; Enzyme activity; Nitrogen and phosphorus removal