Disinfection of sludge using lime stabilisation and pasteurisation in a small wastewater treatment plant

Removal efficiency of faecal coliforms and helminth eggs was evaluated in a small wastewater treatment plant (WWTP) serving a population of 1,000. This system was formed by the association in series of a UASB reactor and four submerged aerated biofilters. The density of faecal coliforms and the coun...

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Bibliographic Details
Published in:Water science and technology 2004-01, Vol.50 (1), p.13-17
Main Authors: Keller, R, Passamani-Franca, R F, Cassini, S T, Gonçalves, F R
Format: Article
Language:English
Subjects:
Aeration
Animals
Biofilters
Bioreactors
Calcium Compounds
Chemical treatment
Coliforms
Disinfection
Disinfection - methods
Eggs
Enterobacteriaceae - isolation & purification
Faecal coliforms
Fecal coliforms
Filtration
Helminths - isolation & purification
Hot Temperature
Lime
Methods
Ovum
Oxides
Pasteurization
Plant removal
Removal
Sewage - microbiology
Sludge
Sludge disposal
Solid phases
Waste Disposal, Fluid - methods
Wastewater
Wastewater treatment
Wastewater treatment plants
Water Purification - methods
Water treatment plants
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Summary:Removal efficiency of faecal coliforms and helminth eggs was evaluated in a small wastewater treatment plant (WWTP) serving a population of 1,000. This system was formed by the association in series of a UASB reactor and four submerged aerated biofilters. The density of faecal coliforms and the count of helminth eggs were estimated in the liquid and solid phases of the system. Two different methods of disinfecting sludge were investigated: (a) chemical treatment with lime and (b) a physical treatment by pasteurisation. As expected, the association UASB + BF was very efficient at removal of helminth eggs from the final tertiary effluent, but coliforms were still present at high densities. Lime treatment and pasteurisation of sludge were very effective methods of disinfection and produced a sludge safe for final disposal.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2004.0005