摘要
[目的]为探明蓼属植物的净水能力,以期明晰蓼属植物应用于生活污水修复的可行性.[方法]选取水蓼(Polygonum hydro pi per)、红蓼(Polygonum orientale)、叉分蓼(Polygonum divaricatum)、酸模叶蓼(Polygonum lapathifolium)为研究对象,通过模拟水培试验,探讨4种蓼属植物对2种浓度生活污水中总氮(TN)、铵态氮(NH4+-N)、硝态氮(NO3--N)、总磷(TP)的去除效果及蓼属植物对污水中氮磷的积累能力.[结果](1)4种蓼属植物对于2种浓度生活污水中的氮磷均有较好的去除效果.(2)高浓度污水处理下,红蓼、叉分蓼和酸模叶蓼对TN、NH4+-N和TP的去除率分别为96.04％～97.41％,94.60％～97.79％和98.78％～99.68％(28天),均显著高于水蓼(p＜0.05).(3)低浓度污水处理下,4种蓼属植物地上部氮磷积累量分别为27.38～37.47 mg/plant和7.65～10.11 mg/plant,植物间差异不显著;高浓度污水处理下,红蓼氮积累能力较强,地上部氮积累量达57.16 mg/plant,酸模叶蓼磷积累能力较强,地上部磷积累量达15.32 mg/plant,水蓼氮磷积累能力均较弱.[结论]4种蓼属植物均可用于修复较低浓度的生活污水,污水浓度较高时宜选择红蓼、叉分蓼和酸模叶蓼作为修复材料.研究结果为生活污水修复的植物材料选择提供参考.
Abstract
[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.
基金项目
四川农业大学学科建设双支计划特色创新团队项目(T202103)
国家自然科学基金项目(31972499)
国家科技期刊平台
NSTL
万方数据