REMOVAL OF COLIFORMS FROM WETLANDS CULTIVATED WITH YELLOW LILY (Hemerocallis flava) IN DOMESTIC SEWAGE TREATMENT
DOI:
https://doi.org/10.13083/reveng.v20i2.275Keywords:
sistemas wetlands, plantas ornamentais, remoção de microrganismosAbstract
This study was done to evaluate the efficacy of removing coliforms from constructed wetlands (CWs) planted to yellow lily (Hemerocallis flava), when subjected to different water retention duration and organic loading rates (OLR) of domestic sewage. The OLR was 44, 98, 230 or 395 kg ha-1 d-1 of BOD, which corresponds to water retention duration of 3.9, 2.0, 1.0 and 0.75 d-1. The performance of the CWs in removing microorganisms was evaluated by counting, total coliforms (TC) and E. coli. The data were subjected to analysis of variance and descriptive analysis. The CWs in which the wastewater was subjected to lower OLRs (44 or 98 kg ha-1 d-1 of BOD) or to longer water retention duration (3.9 or 2.0 days) were most efficient in removing TC and E. coli. The average removal of TC and E. coli varied from, respectively, 1.0 to 4.0 and 2.0 to 4.0 log units.Downloads
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