Drying of pig waste lagoon sludge on mesh-lined timber beds
1989
Choo, P.Y. | Teoh, S.S. | Lim, Y.S. (Dept. of Veterinary Services, Selangor (Malaysia)) | Ong, H.K. (Malaysian Agricultural Research and Development Institute (Malaysia))
The management of stabilized sludge through drying over aluminium mesh lined timber bed over a waste anaerobic lagoon receiving pig waste was investigated. Handleable sludge with a moisture content of 50-60% could be harvested from the timber bed within 11-15 days. Sludge temperatures fluctuated between a range of 29.7 deg. C to 43.3 deg. C. The rate of decrease of sludge height varied from 0.9 - 10.7 mm/d and 1.8 - 9.0 mm/d for sludge managed on roofed and open drying beds respectively. Total volatile solids (TVS) in sludge samples average between 68.1 and 70.2% of total solids (TTS) for open versus roofed drying beds, respectively. Ammoniacal nitrogen (NH3N) and total kjeldahl nitrogen (TKN) constituted 0.1% and 2.0% TTS. The TVS/TKN ratio and moisture content of harvested sludge were within the limits recommended for optimum composting process. The initial capital outlay for the timber sludge drying bed was estimated at $5.10/standing pig population (SPP)
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