摘要
Natural zeolite and coal cinder were layered as main packing medium of the ecological filter instead of traditional filling to remedy the static lake water in Northern China.The ecological filter was running in a combined upward and downward flow mode.Dynamic experiments were carried out to study the effects of retention time and ambient temperature on pollutants' removal efficiency of the hybrid ecological filter.The function of plant was also studied by contrast test.It is showed that the removal efficiencies of NH4+-N and TP are increased when the retention time is changed from 1 h to 2 h and 4 h,but the removal efficiency of TN is decreased,the removal efficiency of NH4+-N is increased from 91.5% to 98% and that of TP is increased from 31.8% to 52.5%.When the temperature declines,the temporal removal efficiency of NH4+-N is reduced,but the removal efficiency of 24 h and 48 h is remained.The removal efficiency of TP after 24 h and 48 h is decreased when the temperature declines evidently.The retention time plays an important role in NH4+-N and TP removal,and the ambient temperature is significant for TP removal.The plant favors for TP and organic matter removal but has little effect on TN removal.
Natural zeolite and coal cinder were layered as main packing medium of the ecological filter instead of traditional filling to remedy the static lake water in Northern China. The ecological filter was running in a combined upward and downward flow mode. Dynamic experiments were carried out to study the effects of retention time and ambient temperature on pollutants＇ removal efficiency of the hybrid ecological filter. The function of plant was also studied by contrast test. It is showed that the removal efficiencies of NH4 ^＋ -N and TP are increased when the retention time is changed from 1 h to 2 h and 4 h, but the removal efficiency of TN is decreased, the removal efficiency of NH4 ^＋ -N is increased from 91.5% to 98% and that of TP is increased from 31.8% to 52. 5%. When the temperature declines, the temporal removal efficiency of NH4 ^＋ -N is reduced, but the removal efficiency of 24 h and 48 h is remained. The removal efficiency of TP after 24 h and 48 h is decreased when the temperature declines evidently. The retention time plays an important role in NH4^＋ -N and TP removal, and the ambient temperature is significant for TP removal. The plant favors for TP and organic matter removal but has little effect on TN removal.
基金
Sponsored by the National Natural Science Foundation of China(Grant No.50809037)
Innovation Fund of Shanghai University(Grant No.10-0111-07-010)
the Specialized Research Fund for the Outstanding Young Teachers of Shanghai(Grant No.37-0111-07-701)
Systems Biology Research Foundation of Shanghai University
