当前位置: X-MOL 学术Front. Environ. Sci. Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Removal of arsenic by pilot-scale vertical flow constructed wetland
Frontiers of Environmental Science & Engineering ( IF 6.4 ) Pub Date : 2021-05-10 , DOI: 10.1007/s11783-021-1435-1
Yaocheng Fan , Tiancui Li , Deshou Cun , Haibing Tang , Yanran Dai , Feihua Wang , Wei Liang

Four pilot-scale Vertical Flow Constructed Wetlands (VFCWs) filled with gravel and planted with Phragmites australis were operated for seven months in the field to study the efficiency of arsenic removal in contaminated wastewater. The average arsenic removal efficiency by the VFCWs was 52.0%±20.2%, 52.9%±21.3%, and 40.3%±19.4% at the theoretical concentrations of 50 µg/L (CW50), 100 µg/L (CW100), and 500 µg/L (CW500) arsenic in the wastewater, respectively. The results also showed no significant differences in the removal efficiency for conventional contaminants (nitrogen, phosphorus, or chemical oxygen demand) between wastewater treatments that did or did not contain arsenic (P>0.05), except for phosphorus in CW500. The highest average monthly removal rate of arsenic occurred in August (55.9%–74.5%) and the lowest in November (7.8%–15.5%). The arsenic removal efficiency of each VFCW was positively correlated with temperature (P < 0.05). Arsenic accumulated in both substrates and plants, with greater accumulation associated with increased arsenic concentrations in the influent. The maximum accumulated arsenic concentrations in the substrates and plants at the end of the experiment were 4.47 mg/kg and 281.9 mg/kg, respectively, both present in CW500. The translocation factor (TF) of arsenic in the reeds was less than 1, with most of the arsenic accumulating in the roots. The arsenic mass balance indicated that substrate accumulation contributed most to arsenic removal (19.9%–30.4%), with lower levels in plants (3.8%–9.5%). In summary, VFCWs are effective for the treatment of arsenic-containing wastewater.



中文翻译:

中试规模垂直流人工湿地去除砷

在田间操作了四个试点规模的垂直流人工湿地(VFCW),其中填充了碎石并种植了芦苇,研究了七个月,以研究去除污水中砷的效率。在50 µg / L(CW50),100 µg / L(CW100)和500的理论浓度下,VFCW的平均除砷效率分别为52.0%±20.2%,52.9%±21.3%和40.3%±19.4%。废水中的砷分别为µg / L(CW500)。结果还显示,在含砷或不含砷的废水处理之间,常规污染物(氮,磷或化学需氧量)的去除效率没有显着差异(P> 0.05),但CW500中的磷除外。最高的平均每月砷去除率发生在8月(55.9%–74.5%),最低的是11月(7.8%–15.5%)。每个VFCW的除砷效率与温度呈正相关(P<0.05)。砷在底物和植物中均会积累,随着进水中砷浓度的增加而积累更多。在实验结束时,基质和植物中的最大累积砷浓度分别为CW500中的4.47 mg / kg和281.9 mg / kg。芦苇中砷的转运因子(TF)小于1,大部分砷积累在根中。砷的质量平衡表明,底物积累是去除砷的最大原因(19.9%–30.4%),而植物中的水平较低(3.8%–9.5%)。综上所述,VFCW可有效处理含砷废水。

更新日期:2021-05-11
down
wechat
bug