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Compost Age and Sample Storage Effects on Maturity Indicators of Biosolids Compost

T.A. Butlera, L.J. Sikora*,a, P.M. Steinhilberb and L.W. Douglassb

a USDA-ARS-AMBL, Beltsville, MD. 20705-2350
b Dep. of Animal and Avian Sciences, Univ. of Maryland, College Park, MD 20742-4452



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  		Fig. 1. Mean daily pile temperatures for biosolids compost for Stages I and II of composting.

 


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  		Fig. 2. Change in mean percent biological volatile solids (BVS) content of biosolids compost samples between Days 1 and 57 of composting.

 


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  		Fig. 3. Response surface depicting the predicted maximum rise above ambient temperature reached in the Dewar flask self-heating test for the age of the biosolids compost (expressed in days) and storage (weeks) at 4°C.

 


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  		Fig. 4. Response surface depicting the predicted values of the log10 of the oxygen uptake rate for the age of the biosolids compost (expressed in days) and storage (weeks) at 4°C.

 


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  		Fig. 5. Response surface depicting the predicted cation exchange capacity (CEC) values in cmol kg-1 for the age of the biosolids compost (expressed in days) and storage (weeks) at 4°C.

 




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