Abstract:In order to find the phosphorus removal filler suitable for constructed wetlands in the Northwest rural areas, in combination with the temperature characteristics in the northwest China, the phosphorus removal effects of concrete slag and biochar were compared in this study. Based on isothermal adsorption and kinetic adsorption experiments, two static subsurface flow constructed wetlands were constructed. Through the simulation operation, the phosphorus ($ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P) removal effects and stability from domestic sewage by these two fillers were tested and verified by comparison. The results showed that compared with biochar, the concrete slag performed better on $ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P adsorption with the fastest adsorption rate and the largest adsorption amount of 2.206 mg·g?1. The $ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P adsorption by concrete slag contained both single-layer and multi-layer adsorption, indicating a non-uniform adsorption process, while the $ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P adsorption by biochar mostly belonged to single-layer adsorption. At the average concentration of influent $ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P with 4.6 mg·L?1, the $ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P removal rates of concrete slag wetlands and biochar wetlands reached 94.86% and 86.37%, respectively when the hydraulic retention time (HRT) reached 24 h. By the comprehensive comparison, it is feasible to use the concrete slag as the filler for phosphorus removal by the subsurface flow constructed wetland in the northwest. The above research can provide reference for phosphorus removal material selection in constructed wetland. Key words:Northwestern region/ phosphorus removal/ constructed wetlands.
图4不同停留时间潜流人工湿地$ {\bf{PO}}_{\bf{4}}^{{\bf{3 - }}}$-P净化效果 Figure4.$ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P purification effect by the subsurface flow constructed wetland under different hydraulic retention times
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HUANG J, XIAO J, GUO X, et al. Long-term effects of silver nanoparticles on performance of phosphorus removal in a laboratory-scale vertical flow constructed wetland[J]. Journal of Environmental Sciences, 2020, 87(1): 319-330.
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China Received Date: 2020-02-01 Accepted Date: 2020-04-21 Available Online: 2021-01-13 Keywords:Northwestern region/ phosphorus removal/ constructed wetlands Abstract:In order to find the phosphorus removal filler suitable for constructed wetlands in the Northwest rural areas, in combination with the temperature characteristics in the northwest China, the phosphorus removal effects of concrete slag and biochar were compared in this study. Based on isothermal adsorption and kinetic adsorption experiments, two static subsurface flow constructed wetlands were constructed. Through the simulation operation, the phosphorus ($ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P) removal effects and stability from domestic sewage by these two fillers were tested and verified by comparison. The results showed that compared with biochar, the concrete slag performed better on $ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P adsorption with the fastest adsorption rate and the largest adsorption amount of 2.206 mg·g?1. The $ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P adsorption by concrete slag contained both single-layer and multi-layer adsorption, indicating a non-uniform adsorption process, while the $ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P adsorption by biochar mostly belonged to single-layer adsorption. At the average concentration of influent $ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P with 4.6 mg·L?1, the $ {\rm{PO}}_{\rm{4}}^{{\rm{3 - }}}$-P removal rates of concrete slag wetlands and biochar wetlands reached 94.86% and 86.37%, respectively when the hydraulic retention time (HRT) reached 24 h. By the comprehensive comparison, it is feasible to use the concrete slag as the filler for phosphorus removal by the subsurface flow constructed wetland in the northwest. The above research can provide reference for phosphorus removal material selection in constructed wetland.
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