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Avaliação de um sistema híbrido de wetlands construídos empregado no tratamento de esgoto sanitário
| Content Provider | Semantic Scholar |
|---|---|
| Author | Rousso, Benny |
| Copyright Year | 2017 |
| Abstract | Constructed wetlands (CW) are an on-site wastewater treatment ecotechnology that provides satisfactory pollutant removal rates associated with a simplified and low cost execution and operation. Arrangements os CW in series, also named hybrid systems, aim to guarantee high depuration levels of organic matter, total suspended solids (TSS) and nitrogen compounds. Owing to contribute to the consolidation of this ecotechnology in the sourthern region of Brazil, this study evaluated the project, execution and performance, in both pollutant removal and hydraulic behavior of outflow discharges and evapotranspiration (ETP), of a hybrid system throughout its first two operational years. The study is justified due to a notorious lack of information about hybrid systems applied in the southern region of Brazil and to a great potential of this ecotechnology to foment sanitation univesalisation in the country. The evaluated system was a full-scale wastewater treatment plant and has treated urban wastewater in an equivalent volume generated by a Brazilian household. It was composed by a septic tank (ST), followed by a Vertical subsurface Flow Constructed Wetland (VFCW) and by a Horizontal subsurface Flow Constructed Wetland (HFCW). The hybrid system received an organic loading rate (OLR) equal to 39.6 ± 11.5 gCOD.mVFCW -2 .d -1 and a hydraulic loading rate (HLR) of 63.2 ± 14.6 mmVFCW.d -1 . The feeding was intermittent (3 to 4 daily pulses) and alternated (3.5 days of operation and 3.5 days of rest). The results pointed to a nonhomogeneity of outlet discharges for the different pulses and days of the week, with an increase of maximum outled discharge (Qmax) throughout the day and the week. The hydraulic monitoring also revelead a decrease in the daily Qmax throughout the operation, which, together with the finding of non-accumulation of solids in bed media, indicated a reduction on the hydraulic conductivity due to the root growth. The water budget showed a methodological difference when using different time steps for the budget analysis. The operational week was the step that presented the results with the smallest standard deviations. The average ETP were a 6.0 ± 1.3 mm.d -1 for the VFCW and 1.0 ± 1.2 mm.d -1 for the HFCW. The pollutant removal achieved excellent removal rates of COD (98 ± 1.5%), TSS (99 ± 2.9%), NH4 + -N (90.7 ± 9.3%) and PO4 3-P (96.2 ± 2.8%), besides a satisfactory removal of TN (68.7 ± 12.6%). The VFCW was the unit in which greater COD, TSS, NH4 + -N and PO4 3-P load was removed, being the intermediate layer (0.3 to 0.5 m of depth) where the highest percentage was treated. The |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://repositorio.ufsc.br/bitstream/handle/123456789/178979/348176.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
