Performance of a vertical subsurface flow constructed wetland under different operational conditions

详细信息    查看全文

• 作者：Sara G. Abdelhakeem ; ^{sg.hakim@cu.edu.eg" class="auth_mail" title="E-mail the corresponding author} ; ^{sg.hakim@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; Samir A. Aboulroos ; Mohamed M. Kamel
• 关键词：Constructed wetlands ; Vegetation ; Sewage effluent ; Growth media ; Feeding mode ; Volumetric rate constant
• 刊名：Journal of Advanced Research
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：7
• 期：5
• 页码：803-814
• 全文大小：523 K

文摘

The performance of a vertical subsurface flow constructed wetland (VSSFCW) for sewage effluent treatment was studied in an eight month experiment under different operational conditions including: vegetation (the presence or absence of common reeds “Phragmites australis”), media type (gravel or vermiculite), and mode of sewage feeding (continuous or batch). Plants had a significant effect (P < 0.05) on the removal efficiency and mass removal rate of all pollutants, except phosphorous. The average removal efficiencies of chemical oxygen demand (COD), biological oxygen demand (BOD), total suspended solids (TSS), ammonium (NH₄) and total-P (TP) were 75%, 84%, 75%, 32% and 22% for the planted beds compared to 29%, 37%, 42%, 26% and 17%, respectively, for the unplanted beds. The VSSFCW was ineffective in removing nitrate (NO₃). The effect of either media type or feeding mode system on the removal efficiency of COD and BOD was insignificant. Vermiculite media significantly (P < 0.05) increased the efficiency of the wetland in removing NH₄, TP and dissolved phosphorous (DP) when compared with gravel particularly in the planted beds. The batch mode was more effective in removing TSS and NH₄ compared to the continuous mode. Volumetric rate constant (k_V) was different for various pollutants and significantly increased due to the presence of plants. Media type had no significant effect on the values of k_V for COD, BOD and TSS, while k_V for NH₄ and TP under vermiculite in the planted beds and k_V for P in the unplanted beds were significantly higher than those under gravel.