Abstract
Retracted article: Contrast experiments on the effect of concentration of the total phosphorus(TP) on treatment efficiency of artificial wetland are carried out through changing TP concentration of influent water into surface flow(SF) and subsurface flow(SSF) wetlands and growing six plants (purple-leaf canna, water onion, water hyacinth, oenanthe javanica, calamus, reed). Treatment efficiencies of SF and SSF wetlands with the six plants varying with TP concentration change are analyzed, and some indexes of purifying function of SF and SSF wetlands with six plants including theoretically optimum treatment concentrations and removal efficiencies, actual optimum treatment concentrations and removal efficiencies, and TP maximum daily treatment loads, are obtained. The experimental results show that, TP removal efficiencies of SF and SSF wetlands with the six plants decrease with the increases of TP concentrations, different plants have different levels of treatment efficiency reduction, and the reduction of removal efficiency of SSF wetland is smaller than that of SF wetland. Removal efficiency of water hyacinth is little changed with the increase of TP concentration, and treatment efficiencies of SF and SSF wetlands decrease by 1.61% and 1.12% respectively. Removal efficiency of Canna is obvious changed, and treatment efficiencies of SF and SSF wetlands decrease by 2.94% and 2.55% respectively. Purple leaf cama had the least changes in the decrease of removal rate, and the table stream processing rate decreased by 17.07%, and subsurface flow by 15.94%. The decrease in the removal rate of reed was clear and its table stream processing rate decreased by 20.86% and wubsurface flow by 18.2%. The actual optimum removal efficiency of SF wetland with water hyacinth is the largest of these SF wetlands’ and reaches 85.2%, and its corresponding maximum daily treatment load of TP is 81g /( d • m2). But the actual optimal removal efficiency of SF wetland with oenanthe javanica is the smallest of these SF wetlands’ and is 76.88%, and its corresponding maximum daily treatment load of TP is 51.84g/( d • m2). The actual optimum removal efficiency of SSF wetland with water hyacinth is also the largest of these SSF wetlands’ and is just 88.31%, and its corresponding maximum daily treatment load of TP is 102.6g/( d • m2). The actual optimum removal efficiency of SSF wetland with cama is the smallest of these SSF wetlands’ and is only 78.32%, and its corresponding maximum daily treatment load is 55.2g/( d • m2).
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