Is recirculation feasible with pre- and post-digested manure? What would be some handling considerations and how does that affect energy and materials usage ?

1) The composition of dairy manure is significantly different in as raw and anaerobically digested. Consider a dairy farm in central Pennsylvania with 1300 cows that also accepts oils and grease from local restaurants into its digester. Answer the following questions:

a.How much dilution water must be added to the pre-and post-digestion dairy manure to produce 70 mg/L total nitrogen in the duckweed growth medium?

b.Is recirculation feasible with pre- and post-digested manure? What would be some handling considerations and how does that affect energy and materials usage ?

c. Estimate the methane production in a typical anaerobic digester for this size farm.

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