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The microbiology and biochemistry of anaerobic digestion
theoretical aspects and modelling of digester
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acetic acid added addition ammonia amount anaerobic digestion animal Applied authors bacteria built carbohydrate carbon dioxide carried cattle cause cells cellulose complex concentration considered contain continuous costs crop culture described detention difficulties digested sludge digester gas dilution domestic effect energy engine excreta experiments factory farm feed feedstock fermentation flow fuel further gas production give glucose growth heat Hobson hydrogen increased input laboratory later less liquid loading material matter mentioned methane methods mg/litre mixing needed nitrogen obtained operation organic piggery-waste pipes plant pollution population possible practice present pressure previously problems Proc production pump reactions reduced removed residues running separate sewage showed shown similar slurry solids solution stage stirring substrate sugar sulphide tank temperature tests treatment unit usually various vary vegetable volume waste