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Effect of artificial aeration on the performance of vertical-flow constructed wetland treating heavily polluted river water

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Journal of Environmental Sciences 2012年第4期24卷 596-601页

作者： Huiyu Dong Zhimin Qiang Tinggang Li Hui Jin Weidong Chen State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Environmental Protection Bureau of Lin'an City Zhejiang Province 311300China

Three lab-scale vertical-flow constructed wetlands （VFCWs）, including the non-aerated （NA）, intermittently aerated （IA） and continuously aerated （CA） ones, were operated at different hydraulic loading rates （HLRs） to evaluate the effect of artificial aeration on the treatment efficiency of heavily polluted river water. Results indicated that artificial aeration increased the dissolved oxygen （DO） concentrations in IA and CA, which significantly favored the removal of organic matter and NH4＋-N. The DO grads caused by intermittent aeration formed aerobic and anoxic regions in IA and thus promoted the removal of total nitrogen （TN）. Although the removal efficiencies of CODEr, NH4＋-N and TN in the three VFCWs all decreased with an increase in HLR, artificial aeration enhanced the reactor resistance to the fluctuation of pollutant loadings. The maximal removal efficiencies of CODEr, NH4＋-N and total phosphorus （TP）（i.e., 81%, 87% and 37%, respectively） were observed in CA at 19 cm/day HLR, while the maximal TN removal （i.e., 57%） was achieved in IA. Although the improvement of artificial aeration on TP removal was limited, this study has demonstrated the feasibility of applying artificial aeration to VFCWs treating polluted river water, particularly at a high HLR.

关键词： vertical-flow constructed wetland artificial aeration polluted fiver water hydraulic loading rate

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Removal,distribution and plant uptake of perfluorooctane sulfonate(PFOS)in a simulated constructed wetland system

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Frontiers of Environmental Science & Engineering 2021年第2期15卷 43-53页

作者： Weichuan Qiao Rong Li Tianhao Tang Achuo Anitta Zuh Department of Environmental Engineering College of Biology and the EnvironmentNanjing Forestry UniversityNanjing 210037China

A vertical-flow constructed wetland(VFCW)was used to treat simulated domestic sewage containing perfluorooctane sulfonate(PFOS).The removal rate of PFOS in the domestic sewage was 93%–98%,through soil adsorption and plant uptake,suggesting that VFCWs can remove PFOS efficiently from *** removal of PFOS in the VFCW was dependent on soil adsorption and plant uptake;moreover,the percentage of soil adsorption was 61%–89%,and was higher than that of the plants uptake(5%–31%).The absorption capacity of Eichhornia crassipes(***)(1186.71 mg/kg)was higher than that of Cyperus alternifolius(***)(162.77 mg/kg)under 10 mg/L PFOS,and the transfer factor of PFOS in *** and *** was 0.04 and 0.58,respectively,indicating that PFOS is not easily translocated to leaves from roots of wetland plants;moreover,uptake of PFOS by *** was more than that of *** because the biomass of *** was more than that of *** and the roots of *** can take up PFOS directly from wastewater while *** needs to do so via its roots in the *** concentration of 10 mg/L PFOS had an obvious inhibitory effect on the removal rate of total nitrogen,total phosphorus,chemical oxygen demand,and ammonia nitrogen in the VFCW,which decreased by 15%,10%,10%and 12%,*** with PFOS in the wastewater reduced the bacterial richness but increased the diversity in soil because PFOS stimulated the growth of PFOS-tolerant strains.

关键词： vertical-flow constructed wetland Perfluorooctane sulfonate wetland plants Soil microbial community Effect

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