| Summary: | 碩士 === 國立中山大學 === 海洋環境學系 === 86 === The effect of plant and substrate of wetlands on nutrient removal was investigated in four lab-scale constructed wetlands , A1、A2、A3 and A4 , respectively. The substrate of both A1 and A2 were gravel with diameter of 5-10 cm , while A3 and A4 were filled with the soil media enriched with limestron . Both of A15-10 cm , while A3 and A4 were filled with the soil media enriched with limestron . Both of A1 and A3 constructed wetland systems were planded with Pennisetum purpureum Schumach , while A2 and A4 were the contrasted wetland system without vegetation . The inflent used for all these four systems was from the primarily treated sewage sampled from the Chung-Chiou Sewage Treatment Plant of Kaohsiung City. The flow rate of influent for the treatment systems was controlled at 4 mL/min. The nutrient removal rate for A1construction wetland system was about 80%,while the main mechanisms for nitrogenous nutrient removal were the plant uptake and microbial activities. The phousphate removal rate for theA4 constructed wetland system was about 100% which was mainly by chemical adsorption . It was found that the specie of Pennisetum purpureum Schumach might have the root zone effect . The substrate of silt enriched with limestron , which the possesed high level of calium , could adsorb phousphate significantly and effectively
|
|---|
