Helminths and protozoans removal in treatment of anaerobic filter - sand filter system focusing agricultural use / Remoção de helmintos e protozoarios em sistema de tratamento filtro anaerobio - filtro de areia visando uso agricola

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

This project was developed with the aim of verifying the use of sand filters as a post treatment system of effluents from anaerobic filters. Most of the pathogens found in the wastewater can be classified as protozoans and helminths. For that, the best application rates of anaerobic effluent were studied in four sand filters. They were 0,25; 0,50; 0,75 and 1,00 m deep. The application rates were 20, 40,60,80 e 100 Lm-2day-1. The experiment was run from May 2003 to August 2004. To verify the presence of the organisms in the wastewater, the methodology adopted by Cetesb was used (described as Standard L5.550, 1989) - Hoffman modified and the results were expressed in number or organisms/L. The results show that the biological process of treatment occurred in the deepest sand filter (1,00 m) was the one which presented the best performance. There was no correlation between the number of microorganisms found and the applied rates but, the value established by NBR 7229 (1993) of 100 Lm-2day-1 of effluent presented satisfactory results

ASSUNTO(S)

sewers esgotos - saneamento sewage helminto sanitary engineering anaerobic bacteria engenharia sanitaria aguas residuais - purificação - filtração aguas residuais aguas residuais - purificação - tratamento biologico sewage sewage helminths bacterias anaerobias

ACESSO AO ARTIGO

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