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COSTS C Regulatory compliance, such as permit applications, site monitoring, biosolids It is difficult to estimate the costs of stabilizing analyses,and regulatory record keeping and biosolids with alkaline materials without specific reporting. details,such as wastewater solids characteristics and quantities. One study estimated costs for Class A The incremental capital cost for meeting Class A alkaline stabilization ranging from$139 to$312 per requirements through alkaline stabilization is the dry ton of wastewater solids processed by facilities lowest among stabilization alternatives such as designed to serve wastewater treatment plants thermal drying and anaerobic and aerobic digestion. ranging in capacity from 10 to 60 million gallons per The incremental unit cost (including capital and day. This estimated range demonstrates the operation and maintenance)associated with creating economy of scale associated with larger systems. a Class A product from a system currently making The capital costs cited in this same study ranged a Class B product and serving a 5 million gallon per from $1.5 to $4.0 million and annual costs were day wastewater treatment facility was estimated to estimated to range from $1 million and $4 million. be $39 per dry ton. Again, this is significantly less This study concluded that alkaline stabilization was than the unit costs to increase pathogen treatment less expensive than composting or thermal drying through aerobic or anaerobic digestion,which were (Sullivan, 1996.) cited as $88 and $103 per dry ton, respectively (National Lime Association, 1998.) Although exact costs for alkaline stabilization cannot be provided, the following items must be Some generators of alkaline stabilized biosolids sell considered in estimating costs for any alkaline the product for approximately$3 to $5 per wet ton. stabilization facility: C Processing equipment purchase and REFERENCES installation. Other Related Fact Sheets C Product curing and storage facilities. Odor Management in Biosolids Management C Loading facilities. EPA 832-F-00-067 September 2000 C Transport of product to point of use. Centrifugal Dewatering/Thickening C Royalty and operating fees for proprietary EPA 832-F-00-053 processes. September 2000 C Equipment maintenance and fuel. Belt Filter Press EPA 832-F-00-057 C Alkaline additive. September 2000 C Labor. Land Application of Biosolids EPA 832-F-00-064 C Odor control equipment and chemicals. September 2000 C Marketing costs/revenues. Other EPA Fact Sheets can be found at the following web address: http://www.epa.gov/owmitnet/mtbfact.htm