Enhanced biogas production using cow manure to stabilize co-digestion of whey and primary sludge
Copyright policy )Enhanced biogas production using cow manure to stabilize co-digestion of whey and primary sludge
Increasing biogas production from municipal anaerobic digesters via additional loading with industrial/agricultural wastes offers a low-cost, sustainable energy generation option of significant untapped potential. In this work, bench-top reactors were used to mimic a full-scale primary sludge digester operating at an organic loading rate (OLR) of 2.4 kg COD/m3 d and a 20 d hydraulic retention time (HRT). Co-digestion of whey with primary sludge was sustained at a loading rate of 3.2 kg COD/m3 d (17 d HRT) and boosted gas production to 151% compared to primary sludge digestion alone. Addition of chemical alkalinity enabled co-digestion of whey with primary sludge to be maintained at an elevated OLR of 6.4 kg COD/m3 d (11 d HRT) with gas production increased to 208%. However, when the chemical addition was simply replaced by cow manure, stable operation was maintained at OLRs of 5.2-6.9 kg COD/m3 d (11-14 d HRT) with gas production boosted up to 268%.
- Massey University New Zealand
- University of Queensland Australia
- University of Queensland Australia
- Massey University New Zealand
- University of Queensland Australia
Sewage, Biogas, Co-digestion, Milk Proteins, Sludge, 2311 Waste Management and Disposal, Manure, Cow manure, 2312 Water Science and Technology, Whey Proteins, Whey, 2304 Environmental Chemistry, Biofuels, Animals, Cattle
Sewage, Biogas, Co-digestion, Milk Proteins, Sludge, 2311 Waste Management and Disposal, Manure, Cow manure, 2312 Water Science and Technology, Whey Proteins, Whey, 2304 Environmental Chemistry, Biofuels, Animals, Cattle
