Anaerobic co-digestion of algal sludge and waste paper to produce methane.
The unbalanced nutrients of algal sludge (low C/N ratio) were regarded as an important limitation factor to anaerobic digestion process. Adding high carbon content of waste paper in algal sludge feedstock to have a balanced C/N ratio was undertaken in this study. The results showed adding 50% (based on volatile solid) of waste paper in algal sludge feedstock increased the methane production rate to 1170+/-75 ml/l day, as compared to 573+/-28 ml/l day of algal sludge digestion alone, both operated at 4 g VS/l day, 35 degrees C and 10 days HRT. The maximum methane production rate of 1607+/-17 ml/l day was observed at a combined 5 g VS/l day loading rate with 60% (VS based) of paper adding in algal sludge feedstock. Results suggested an optimum C/N ratio for co-digestion of algal sludge and waste paper was in the range of 20-25/1.
Yen
Hong-Wei
HW
Department of Chemical Engineering, Tunghai University, Taiwan, ROC. hwyen@thu.edu.tw
Brune
David E
DE
D000693:Anaerobiosis; D002480:Cellulase / Q000378:metabolism; D056890:Eukaryota / Q000378:metabolism*; D008697:Methane / Q000096:biosynthesis*; D010209:Paper; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage
D012722:Sewage; D002480:Cellulase; D008697:Methane