Oily Waste Disposal Survey, South Tank Farm, Lajes Field, Azores
1991
Binovi, Robert D.
A survey of the wet and dry sludge pits at the South Tank Farm, Lajes Field, Azores was performed by members of the AFOEHL. Samples of the waste water and sludge from the wet sludge pit (WSP) were taken as well as from the dry sludge pit. Bioremediation studies, incineration, and carbon adsorption studies were performed. The characterization of the waste water from the WSP revealed a one phase mixture of mostly soluble oils and grease with an average COD concentration of 1760 and a BOD of 407 mg/1. Oils and grease concentrations were in the 10 mg/1 range. The characterization of the sludge revealed 43% organics and concentrations of metals not high enough for consideration as hazardous waste. The sludge from the DSP also did not have levels of metals high enough for special disposal as hazardous waste. The WSP waste water was slow to degrade biologically through stimulation of indigenous organisms. Carbon was effective in removing COD. The WSP waste water has subsequently been released to the Praia Bay and the sludge recovered and drummed. Recommendations included the construction of a secondary sewage treatment plant to service the base, airport, and Praia, the construction of a sludge drying facility and testing of the dried sludge for ultimate disposal.
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