Abstract: Nutrient removal is essential for swine wastewater treatment to protect receiving waters from eutrophication and for potential reuse of the treated water.The study was conducted to examine the growth status of knotgrass(Paspalum distichum L.) and the wastewater purification effects under various swine wastewater concentration(25%,50%,75%,and 100%) in order to choose the proper swine wastewater concentration for enhanced purification efficiency and productivity.The results show that knotgrass biomass increased significantly and root length decreased significantly with swine wastwater concentration increasing(P<0.05).But there was no significant difference in plant height of knotgrass.Knotgrass had excellent nitrogen and phosphorus removal efficiencies with removal percentage of 98.75 to 99.31% for TN and 96.54 to 99.79% for TP.The highest nitrogen and phosphorus removal amounts were achieved for 100% concentration of swine wastewater at the rate of 507 mg·L^-1 for TN and 32 mg·L^-1 for TP,respectively.Knotgrass had no significant removal effects on COD and NH⁺₄-N.

Key words: Paspalum distichum L., Wastewater purification, Nitrogen, Phosphorus

摘要： 于2009年5月以双穗雀稗(Paspalum distichum L.)为供试材料、河砂为基质开展其为期30d的静态水培试验,研究在25%、50%、75%、100%共4种猪场养殖污水浓度下,双穗雀稗的生长状况及对污水的净化效果,选择适宜的猪场养殖污水浓度以提高双穗雀稗的净化效率和生产效率。结果表明,污水浓度增加对双穗雀稗的株高影响不显著,但对生物量具有显著影响(P<0.05),高浓度污水对根长的生长具有明显阻碍作用;与不栽种植株的静置组相比,双穗雀稗水培对污水中的总氮(TN)、总磷(TP)具有较好的去除效果,TN的去除率为98.75%-99.31%,TP的去除率为96.54%-99.79%。100%污水时,TN、TP的去除量最大,分别为507 mg·L^-1和32mg·L^-1;而对COD和NH₄⁺-N的去除效果并不显著。

关键词: 双穗雀稗, 污水净化, 氮, 磷