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COMMERCIAL COMPOSTING WATER QUALITY PERMIT DEVELOPMENT <br /> TABLE 2-3 <br /> Reported Concentrations of Various Constituents in Compost Leachate from a Leaf Composting Facility <br /> Yard Trimmings(Leaf 1200-Z Benchmarks 1200-COLS Benchmarks <br /> Composting) (mg/L) (mg/L) <br /> Constituent Average(mg/L) <br /> Aluminum(AI) 0.33 NA NA <br /> Iron(Fe) 0.57 NA NA <br /> Lead (Pb) 0.01 0.4 0.006 <br /> Potassium(K) 2.70 NA NA <br /> Zinc(Zn) 0.11 0.6 0.24 <br /> Phosphorus(P) 0.07 NA 0.016 <br /> Phenols(total) 0.18 NA NA <br /> Biochemical Oxygen >41a NA 33 <br /> Demand(BODS) <br /> Chemical Oxygen 56 NA NA <br /> Demand(COD) <br /> pH 7.8 S.U. 5.5-9.0 S.U. 6.5-8.5 S.U. <br /> Notes: <br /> The study didn't discuss whether BMPs were used or properly maintained.(EPA,May 1994) <br /> a. Includes 3 samples above detection limit of 150 mg/L <br /> NA=not available <br /> Table 2-4 shows concentrations of Salmonella and Fecal coliform in the compost leachate <br /> from two different composting methods at two different times of the year to represent <br /> different precipitation levels(Period 1 ran from November to March and Period 2 ran from <br /> March to June). Compost feedstocks used in this study consisted of a combination of <br /> commercial mixed food waste,chicken offal,sheep heads (only used in Period 2),dairy <br /> manure,yard debris,sawdust (only used in Period 1),and sawdust/shredded yard debris <br /> (only used in Period 2). <br /> In Period 1,Salmonella concentrations were consistent the entire time compost leachate was <br /> collected (process weeks 2 to 8) for both composting methods. Fecal coliform followed <br /> similar trends (increased in week 4, decreased midway through, and then increased at the <br /> end)in both composting methods,but it was found in concentrations that were one to two <br /> orders of magnitude higher in the passively aerated windrow. In Period 2,compost leachate <br /> was only present during process weeks 2 through 5.During Period 2 salmonella was <br /> detected in similar concentrations in both composting methods.Fecal coliform showed a <br /> steady decrease in process weeks 4 and 5 in the turned windrow and a steady increase in <br /> those same weeks in the passively aerated windrow.Fecal coliform was one to four orders <br /> of magnitude higher in the turned windrow method.There is not a clear indication for the <br /> difference in performance between the two periods.The obvious differences between the <br /> 8 PDX/041320015.DOC <br />