期刊
ENVIRONMENTAL TECHNOLOGY
卷 34, 期 8, 页码 961-965出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2012.724210
关键词
swine manure; wetlands; wastewater treatment; retention time; tropical macrophytes
资金
- FAPEMIG
- CNPq
This study aimed to evaluate the influence of hydraulic retention time (HRT) and cultivated species in vertical-flow constructed wetlands (CW) on the removal of pollutants found in swine wastewater. The applied organic loading per unit area was 20gm(2)d(1) of COD in nine cylindrical CW planted with Cyperus sp., Heliconia rostrata and Hedychium coronarium, and three controls containing only gravel. The HRT tested were 24, 48, 72 and 96h. The following parameters of the CW influent and effluent were analysed: pH, ORP, turbidity, alkalinity, COD, TN, TKN, NHx, , TP, K and Na. Statistical analysis was performed at a 1% level of probability according to the Tukey test. It was noted that the greatest reductions were observed when CW were operated at higher HRT. TKN removals were 1.3 times greater than in unplanted CW. The best combination was CW planted with Cyperus sp. operating with a 72h HRT, presenting the highest average mass removals with values of 69.1% (COD), 56.5% (TKN), 61.7% (NHx), 64.3% (TP) and 55.0% (K).
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