浮床虎杖对不同浓度铵盐的降解效果研究

Floating Bed Cultivation of Polygonum cuspidatum Degrades Ammonium Salt

本研究旨在探究浮床虎杖对不同浓度氨氮的降解效果。通过室内大桶构建浮床虎杖,添加不同浓度组铵盐(0,1,5,10 mg/L)测定TN、NH_4^+-N、NO_3--N、NO_2--N、TP等水质指标。结果表明第5～13天4种不同浓度铵盐TN浓度下降,第17天升高;10 mg/L铵盐组NH_4^+-N浓度第5～13天下降;敞水区5和10 mg/L铵盐组NO_3--N浓度先升高后降低,根系区分别在第5天和第9天达到峰值;10 mg/L铵盐组NO_2--N浓度第5天升高至峰值第13天降至0;对照组TP浓度高于其他铵盐浓度组。浮床虎杖可在第9～13天内能造成TN、NH_4^+-N、NO_3--N、NO_2--N浓度下降,但TP浓度降至0需要更长时间。

To study the degradation effect of floating bed cultivation of Polygonum cuspidatum on differentconcentration ammonium salt, the floating bed cultivation of Polygonum cuspidatum was constructed in big indoor bucket, the water quality indexes(TN, NH4+-N, NO3--N, NO2--N, TP) were tested by adding different concentrations ammonium salt. The results showed that the TN concentrations of four different concentrations of ammonium salt decreased from the 5 thto the 13 thday, and increased on the 17 thd. The concentration of NH4+-N in the 10 mg/L ammonium salt group decreased from the 5 thto the 13 thday. The NO3--N concentration from the open water area group with 5 and 10 mg/L ammonium salt initially increased and then decreased, and those from the root zone reached the peak on the 5 thand 9 thday, respectively. The NO2--N concentration in the 10 mg/L ammonium salt group increased to the peak on the 5 thday, while it dropped to 0 on the 13 thday. The TP concentration in the control group was higher than those of the other groups. The concentration of TN, NH4+-N,NO3--N and NO2--N can be degraded by floating bed cultivation of P. cuspidatum from the 5 thto the 13 thday,while the concentration of TP dropping to 0 needs more time.