水葫芦净化富营养化水体效果及对底泥养分释放的影响

摘要

采用人工模拟方法,研究了水葫芦种养对富营养化水体净化效果以及底泥养分释放的影响.结果表明,水葫芦种养覆盖度为60％、初始放养量为4.0 kg/m2时对4种富营养化水体中的营养盐去除效果最好,出水中全氮、全磷浓度分别降至0.15 ～5.69 mg/L和0.04～0.14 mg/L.水葫芦在修复水体过程中还促使了底泥中养分向上覆水的释放,全氮、全磷的释放速率分别达到1.03 ～2.83 mg/(kg·d)、0.16～0.51 mg/(kg·d).%The simulation experiments were carried out to study the effect of water hyacinth on purification of eutrophic water and nutrient release from sediment. When water hyacinth coverage was 60% and the initial fresh weigh was 4. 0 kg/m2, the removal rates of nutrients were the highest, with the concentrations of TN and TP in effluent reduced to 0.15-5. 69 mg/L and 0.04-0. 14 mg/L, respectively. Cultivating water hyacinth in eutrophic water facilitated the release of nutrients from sediment into overlying water, the release rates of TN and TP being 1.03-2. 83 mg/( kg · d) and 0.16-0.51 mg/(kg · d) , respectively.