The influence of pollutantson plant growth and treatment efficiency of horizontally-constructed wetlands

Constructed wetlands (CWs) have been widely used for wastewater treatment due to advantages such as low cost and easy operation. However, pollutant concentrations directly affect efficiency by inhibiting plant microbial growth. This study aims evaluate the relationship between concentrations, tolerance of plants, horizontal subsurface flow (HSF) CWs receiving synthetic wastewater. The results showed that Cyperus alternifoliusL. grew well in conditions with chemical oxygen demand (COD) NH4+ up 75 125 mg/l, respectively, pH 5-8. lowest was 56.7% at an initial COD concentration 1000 mg/l. There were several dead plants a 200 When range 500-750 75-125 efficiencies organic matter 82.5-85.1 31-69.7%, respectively. value stable neutral level during process. ranges (500-750 mg/l) (75-125 optimal thresholds pollution control while also ensuring normal serves basis considering characteristics design HSF CW systems practice.