Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7482278 | Journal of Environmental Management | 2015 | 6 Pages |
Abstract
The study investigates treatment and reuse potential of domestic wastewater of a small community of about 30 people sequentially by anaerobic pretreatment followed by horizontal (HSSF-CW) and vertical (VSSF-CW) sub-surface flow constructed wetlands operated in series. The organic and suspended solids load to the hybrid wetland system was decreased by anaerobic pretreatment. HSSF-CW mainly removed organic matter and supported denitrification whereas VSSF-CW mainly obtained nitrification and phosphorus removal. Recirculation of the effluent increased particularly total nitrogen removal in the wetland system. The study involves evaluation of the whole system in terms of effluent quality. It was achieved on average >95% organic matter and >90% nitrogen removal in the hybrid constructed wetland system with anaerobic pretreatment at a specific wetland surface area of only about 1Â m2 per person. Average mass removal rates were 21.17 gCOD/m2day, 5.58 gBOD5/m2day, 2.78 gTKN/m2day, 1.35 gTN/m2day, 0.44 gTP/m2day and 5.21 gTSS/m2day throughout the total duration of the operation. Consequently, the effluent met the regulations for discharge limits for organic matter and suspended solids. COD and TN concentrations decreased to below 20Â mg/L in the effluent. It was also shown that effluent of the system could be reused for irrigation if it is disinfected properly.
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Authors
Selma Ã. Ayaz, Ãzgür AktaÅ, Lütfi Akça, Nur Fındık,