Published: Jan 1988
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New Jersey, the most densely populated state, produces approximately 2 300 000 dry lb/day (10 432 800 kg/day) of sewage sludge. Half of the sludge is disposed of in the ocean, the rest is managed through land-based alternatives consisting of agricultural land application, composting, and incineration. Land-based options for sludge management have effects on air, ground, and surface water quality. The New Jersey Sludge Quality Assurance Regulations (SQAR), promulgated 18 Oct. 1979, require wastewater facilities to periodically sample and analyze the sludge for certain parameters based on total sewage flow. It was the intent of these regulations to supply the necessary data to determine the quantity, chemical and physical nature, and management mode of the sludge being generated. When the SQARs were promulgated, there were no standardized analytical methods for sludge analysis. A Sludge Methods Task Force, consisting of representatives from academia, major treatment works, industry, and the state and federal government, was created to establish the testing methods. The general procedure adopted by the task force consists of literature and in-house laboratory methods review, and conducting intra-and interlaboratory method validation studies. Once finalized as acceptable methods, the task force recommended their incorporation into the State's laboratory certification program as “approved” methods for the analysis of sludge.
sludge, heavy metals, analytical methods/sludge
Principal geologist, Bureau of Ground Water Quality Management, Trenton, NJ