%0 Journal Article
%T Efeito da taxa de carregamento sobre a remo  o de poluentes de esgoto em sistemas alagados constru¨ªdos Effect of loading rate on removal of pollutants from wastewater in constructed wetlands
%A Antonio T. de Matos
%A Mozart da S. Brasil
%A Paola A. V. Lo Monaco
%J Engenharia Agr¨ªcola
%D 2013
%I Sociedade Brasileira de Engenharia Agr¨ªcola
%X Objetivou-se estudar o efeito da taxa de carregamento sobre a efici¨ºncia de sistemas alagados, constru¨ªdos de escoamento horizontal subsuperficial (SAC-EHSS), em remover poluentes de esgoto sanit¨¢rio. Os SAC-EHSS foram alimentados com efluente proveniente de tanque s¨¦ptico, sob taxas de carregamento organico volum¨¦trico (TCO V) de 53 a 231 g m-3d-1 de demanda qu¨ªmica de oxig¨ºnio (DQO total) e as associadas taxas de carregamento (TC V) de demanda qu¨ªmica de oxig¨ºnio sol¨²vel, s¨®lidos suspensos totais (SST), nitrog¨ºnio total (N-Total) e f¨®sforo total (P-Total). Para avalia  o de desempenho dos SAC-EHSS, as mesmas vari¨¢veis foram quantificadas em seu efluente. Rela  o linear e positiva foi obtida entre as taxas de remo  o de DQO total, DQO sol¨²vel e SST, e as TC V, nas faixas em que foram aplicadas, al¨¦m de n o terem sido observados efeitos negativos desta vari¨¢vel sobre a efici¨ºncia na remo  o desses poluentes. As taxas de remo  o de N-Total e P-Total n o apresentaram, entretanto, tend¨ºncia de aumento com a TC V aplicada nos SAC- EHSS, cultivados com taboa e utilizados no tratamento de efluente sanit¨¢rio. As cargas aplicadas desses nutrientes devem ser consideradas referenciais no dimensionamento desses sistemas, caso se queira maximizar a remo  o global de poluentes da ¨¢gua residu¨¢ria. This research aimed to study the effect of loading rate on the efficiency of constructed wetlands with horizontal subsurface flow (CW-HSSF) to remove pollutants from wastewater. The CW-HSSF were fed with effluent from septic tank under volumetric organic loading rate (OLR V) of 53 to 231 g m-3d-1 of chemical oxygen demand (total-COD) and associated loading rates (LR V) of soluble chemical oxygen demand (soluble COD), total suspended solids (TSS), total nitrogen (total-N) and total phosphorus (total-P). To evaluate the performance of CW-HSSF the same variables were quantified in its effluent. Linear and positive relationship was found between the removal rates of total COD, soluble COD and TSS and the LR V, within the application range, and no negative effects on this variable in removal efficiencies of these pollutants. The removal rate of total-N and total-P did not show, however, tendency to increase with the LR V applied in the CW-HSSF planted with cattail and used in treating sanitary sewage. The loads applied of these nutrients must be considered referential in sizing these systems, if desired to maximize the overall removal of wastewater pollutants.
%K carga organica
%K sistemas wetland
%K tratamento biol¨®gico
%K organic load
%K wetland systems
%K biological treatment
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000200011