粉绿狐尾藻对氮磷的去除速率模型研究

Study on Nitrogen and Phosphorus Removal Rate Model of Green Myriophyllum Verticillatum

采用室外完全随机试验,研究粉绿狐尾藻在氨氮、硝氮、总磷三因素作用下氨氮、硝氮、总磷的去除速率模型。结果表明:粉绿狐尾藻净水能力强弱受三因素影响表现为总磷>氨氮>硝氮,尤其受总磷、氨氮交互影响,能显著改变粉绿狐尾藻净水能力。氨氮、硝氮、总磷去除速率模型基本符合负指数模型,但因浓度范围不同而表现出差异性。负指数模型中a、b值亦因氨氮、硝氮、总磷浓度不同而表现出较大差异性。以粉绿狐尾藻为主构建生态净水系统后,前0~12 d是净水关键时期,是去除能力最强、去除速率最快、去除污染物最多的时期,12 d后,对氨氮、硝氮、总磷的去除率分别可达60.4%~78.1%,40.20%~49.88%,78.6%~82.94%。研究成果可为实时把控污水污染物浓度提供参数依据,为更好发挥粉绿狐尾藻净水效果提供指导。

Complete outdoor randomized trials are used to study their removal rate model of green myriophyllum verticillatum under the influence of ammonia nitrogen,nitrate nitrogen and total phosphorus.The result shows:green myriophyllum verticillatum's water purification ability is varied to three factors,especially to total phosphorus and ammonia nitrogen.Influential factors show that total phosphorus>ammonia nitrogen>nitrate nitrogen,and first two of them can change purification ability much.The removal rate model of three factors is negative index model,and differs from concentration.And the same to a and b in the model.The first 0~12 d is critical purification period when removal ability is the best,removal rate is the fast,and removal contaminant is the most after building the green myriophyllum verticillatum ecosystem,the removal rates of ammonia nitrogen,nitrate nitrogen and total phosphorus were 60.4%~78.1%,40.20%~49.88%and 78.6%~82.94%respectively.This paper can provide reference to know pollutant concentration in time,and also can provide guidance to make purification better by using myriophyllum verticillatum.