Evaluation of filtration ditches as method of post treatment of effluent anaerobic : removal natural of pathogens and nutrients in application of high hydrauli rates / Avaliação das valas de filtração como metodo de pos-tratamento de efluente anaerobico : remoção natural de patogenos e nutrientes na aplicação de altas taxas hidraulicas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The aim of this work was to study filtration ditches as a method of low cost applicable the isolated homes and the small Brazilian municipalities for the posttreatment of anaerobic effluent from a system septic tank with anaerobic unit in the removal of natural nutrients and pathogenic microorganisms. For the research were analyzed three filtration ditches on pilot-scale with 1 m length and 0,5 m width, with height of the layer of sand equal 0,25, 0,50, and 0,75 m was used a drainage pipe in HDPE - High Density Polyethylene - with 0,10 m in diameter. The of filtration ditches were fed by effluent from a system septic tank with anaerobic unit were used four high hydraulic rates (40, 60, 80, and 100 L/m2.day) each rate was applied in the frequency of 6, 12, 18, and 24 hours/day. The municipal wastewater, affluent and the effluent of the filtration ditches were weekly analyzed allowing that the results obtained in the study removal of organic matter exceeded 82,5% BOD and adequacy of coliform, absence of pathogenic microorganisms. In terms of nitrogen compounds, a high nitrification occurred. The phosphorus concentration also was very reduced, the effluent of the three filtration ditches being in compliance with Brazilian laws at all the rates used.

ASSUNTO(S)

system septic tank with anaerobic unit low cost cost and pathogenic microoganisms esgotos - saneamento aguas residuais - eliminação sanitary engineering microorganismos patogenicos environmental sanitation sanitary wastewater aguas residuais - purificação - filtração fossas aguas residuais

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