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NEW TECHNOLOGY AND PEC PROCESS - COLUMBUS, GA
Citation:
SMITH, J. D. NEW TECHNOLOGY AND PEC PROCESS - COLUMBUS, GA. Presented at 7th Annual National Biosolids Conference and Workshop, Potomac, MD, October 10 - 13, 2005.
Description:
The presentation will discuss Columbus, Georgia’s Biosolids Flow-through Thermophilic Treatment (BFT3) Process. Site-specific equivalency requires proof. Laboratory-scale pathogen testing must exceed Class A performance criteria while simulating full scale as closely as possible; 1) 2-log10 reduction of helminth ova densities, 2) 3-log10 reduction of virus densities. The applicant must prove the full-scale CFSTR is hydraulically equivalent to or more conservative than the bench-scale CFSTR. Plug flow minimum detention time must exceed the required “batch time” laboratory-scale pathogen testing at UNC-Chapel Hill, where work was done by Mike Aitken (digestion) and Mark Sobsey (pathogens).
PFRP Equivalency for Columbus, Georgia’s CBFT3 process was demonstrated in Lab by: 1) Running the CFSTR with either a 4.5-day MCRT at 55°C or a 6.0-day MCRT at 53°C, and The Plug flow-batch unit at 55°C or 53°C for additional 30 minutes; 2) keeping the average ammonium-nitrogen content of the digesting sludge in the CFSTR at not less than 920 mg/l; 3) keeping the pH in the digester at 7.3 or higher; 4) keeping the total volatile acid concentrations were between 1,000 and 2,250 mg/L; 4) thoroughly heating of the sludge, this was ensured in the lab by submerging the tank in a water bath.