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WATER TREATMENT PLANT SLUDGE CLASSIFICATION AND BIODEGRADATION FOR SANITARY LANDFILL DISPOSAL

ABSTRACT

Drinking water production by Water Treatment Plants (WTPs) removes suspended particles from raw water by sedimentation and filtration processes, resulting in waste production. In most cases the destination of the accumulated sludge at the sedimentation basins is the nearest stream. The objective of this study was to verify the viability of ultimate disposal, at a sanitary landfill, of dewatered sludge from two WTPs: WTP Capim Fino, at Piracicaba, SP, and WTP II, at Rio Claro, SP. The WTP sludge classification tests were performed according to the standard NBR 10.004 "Solid Wastes Classification" by ABNT. The biodegradation tests were performed though Bartha’s respirometric method by Cetesb. The results indicate that these wastes are classified as not inert, demanding adequate conditions for their ultimate disposal, however the sludge and sanitary landfill soil mixture did not interfer negatively in the biodegradation process, indicating that the solids resulting from WTP sludge dewatering can be disposed at the Rio Claro sanitary landfill.

KEY WORDS
Sludge; treatment; water; biodegradation; sanitary landfill

Instituto Biológico Av. Conselheiro Rodrigues Alves, 1252 - Vila Mariana - São Paulo - SP, 04014-002 - São Paulo - SP - Brazil
E-mail: arquivos@biologico.sp.gov.br