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Bacteriological characteristics and stabilization of sewage sludge subjected to different Hygienization processes

Author: 
Amilton Alves Filho, Reginaldo de Camargo, Regina Maria Quintão Lana, Alirio Coromoto Daboin Maldonado, Marcia Regina Moraes and Roberto Terumi Atarassi
Subject Area: 
Life Sciences
Abstract: 

This study aimed to evaluate the efficiency of solar radiation, combined with chemical treatment in acid and alkaline media during different hygienization periods given the total content of volatile solids, total solids, temperature, pH and total coliforms in sewage sludge. The experimental design process used was randomized blocks in a 5x3 +1 factorial scheme, with four replications, with plot factor being made up of disinfectant products (260 mg L-1 peracetic acid, 2400 mg L-1 Quaternary Ammonium Compounds, lime equivalent to 30% of the dry mass of the sewage sludge, 2500 mg L-1 sodium hypochlorite and pure sludge) and subplot factor being treatment period (T1= 7 days, T2= 14 days and T3= 21 days), plus an additional treatment made up of pure sludge at zero time. Hydrated lime at 30 dag kg-1 has reduced levels of total coliforms to acceptable limits by environmental standard, has raised total solid content, reduced volatile solid content and lowered foul odor emissions. Solar radiation itself was not able to reduce the amount of total coliforms to an acceptable standard required by Brazilian environmental legislation. Hydrated lime in the ratio of 30% dag kg-1 by weight of dry mass can be used as a way to disenfect sweage sludge, concerning bacteriological content and stabilization. The other disinfectant products did not perform the same efficiency on reducing total coliforms or volatile organic compounds.

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