不同N水平的富营养化水体中经济植物净化能力比较研究

Comparative studies on purification ability of economic plants in different N level eutrophic water

为建立净化富营养化水体的生态工程,本试验选择水芹、水蕹菜、韭菜、葱、黄花菜、芹菜等6种经济植物,研究了各种植物的净化能力及其生物学特性。结果表明:每种经济植物对水体总氮、总磷均有一定的去除作用,特别是水芹和水蕹菜,其在试验的20d内,对总氮、总磷的去除百分率分别为89.5%,98.2%;同时还对6种经济植物引起水体总氮浓度下降与时间关系作回归分析,结果表明随着处理时间的延长,水体中总氮浓度呈负指数形式衰减。本文还对在植物处理过程中,水中Chla、BOD5和COD的变化进行了观测。研究表明,在高N水平的富营养化水中除水芹和水蕹菜外,Chla、BOD5和COD随处理时间的延长而下降,但在韭菜和葱处理过程中,水中腥味加重。各项指标综合分析表明,在不同N水平的富营养化水体中,水蕹菜处理效果最好,水芹次之,黄花菜和芹菜居中,韭菜最差。

For building the ecological engineering to purify the eutrophic water, six economic plants, which are Cress, Ipomoea aqutica, leek, Chinese chives, Celery and Hemerocallis respectively, were selected, and the purification ability and the bio - ecological character of them were studied. Results show that each species has great ability to removal total nitrogen （TN） and total phosphorous （TP）, especial Cress and Ipomoea aqutica, during the 20 d experiment period, the removal percentage to TN and TP is 89.5 % and 98.2 %, respectively; TN concentration in water declined in negative exponent form with the time continuing. The changes of Chla, BOD5 and COD were observed？during the treatment. It was found that in high nitrogen eutrophic water, except Cress and Ipomoea aqutica, the Chla, BOD5 and COD decreased with time continuing, but the acrid smell in the water aggravated during leek and Chinese chives treatment. The integrated analysis of all indices indicate that in different nitrogen eutrophic water, the purification effect of Ipomaces aquatica was the best, Cress take second place, Hemerocallis and Celery place in the center, leek was worst.