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Additional digestion of anaerobically digested biosolids. 6°F) for an additional 40 days. 3. Additional digestion of aerobically digested biosolids. Biosolids with a 2% or less solids content are considered to have achieved satisfactory vector attraction reduction if they lose less than 15% additional volatile solids when they are aerobically digested in the laboratory in a bench scale unit at 20°C (68°F) or higher for an additional 30 days. 4. Specific oxygen uptake rate for aerobically digested biosolids.

An illustration of the vector attraction reduction certification is provided in Fig. 9. , no recordkeeping or reporting requirements). POTWs that prepare biosolids in bags or other containers but whose biosolids do not meet pollutant concentration limits must include in their files (1) the AWSAR that does not cause the APLR to be exceeded, (2) pollutant concentrations and vector attraction reduction certifications (and descriptions), and (3) a certification that the labeling management practice has been met.

Recordkeeping for Class A biosolids. For Class A biosolids that do not meet pollutant concentration limits, the preparer must keep pollutant concentration data, management practice certifications (and descriptions), and pathogen and vector attraction reduction certifications (and descriptions). An example of a management practice certification is provided in Fig. 8. The biosolids land applier is required to maintain information on the land-application site location, number of hectares (or acres) in the site, data and time of application, cumulative amount of pollutant applied, total amount of biosolids applied in the application, and certifications and descriptions of information obtained from the biosolids preparer.

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