Effects of Four Species of Polygonum on Nitrogen and Phosphorus Removal from Simulated Domestic Sewage
[Objective]To investigate the water purification capabilities of Polygonum species and assess their suitability for the remediation of domestic sewage.[Methods]Polygonum hydropiper,Polygonum orientale,Polygonum divaricatum and Polygonum lapathifolium were selected as the research objects.The removal effects of total nitrogen(TN),ammonium nitrogen(NH4+-N),nitrate nitrogen(NO3--N),and total phosphorus(TP)in two concentrations of domestic sewage by these four species of Polygonum were discussed through a simulated hydroponic experiment.Additionally,the accumulation ability of Polygonum species to nitrogen and phosphorus in sewage was examined.[Results](1)All four species of Polygonum exhibited good removal effects on nitrogen and phosphorus in two concentrations of domestic sewage.(2)Under high concentration sewage treatment,the removal rates of TN,NH4+-N and TP by Polygonum orientale,Polygonum divaricatum and Polygonum lapathifolium were 96.04％～97.41％,94.60％～97.79％and 98.78％～99.68％(28 days),respectively,which were significantly higher than those of Polygonum hydropiper(p＜0.05).(3)Under low concentration sewage treatment conditions,the shoot nitrogen and phosphorus accumulation of four species of Polygonum were 27.38～37.47 mg/plant and 7.65～10.11 mg/plant,respectively,with no significant difference between plants;Under high concentration sewage treatment,Polygonum orientate exhibits a strong nitrogen accumulation capability,with shoot nitrogen accumulation reaching 57.16 mg/plant,while Polygonum lapathifolium exhibits a strong phosphorus accumulation capability,with shoot phosphorus accumulation reaching 15.32 mg/plant.Conversely,Polygonum hydropiper displays weak nitrogen and phosphorus accumulation abilities.[Conclusion]These findings indicate that all four Polygonum species can be used to the remediation of low-concentration domestic sewage.Among them,Polygonum orientale,Polygonum divaricatum,and Polygonum lapathifolium are more suitable for treating high-concentration sewage.This study offers valuable insights into selecting plant materials for remediating domestic sewage.
domestic sewagePolygonum plantsnitrogen and phosphorus removalaccumulation of nitrogen and phosphorus
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