Co-digested substrate(s) | Operating conditions | Improvement | Reference |
---|---|---|---|
Cattle slurry (manure) with fruit–vegetable waste (FVW) and chicken manure | Continuous stirred tank reactor (CSTR); mesophilic temp; 21 days HRT; OLR 3.19–5.01 kg VS/m3 day | 20–50% CH4 yield increment | Callaghana et al. (2002) |
Manure, solid abattoir wastes (cattle and swine), and FVW | Semi-continuous stirred reactor; mesophilic temp; up to 1.3 kg VS/m3 day OLRT; 30 days HRT | By factory 5 biogas yield increment | Alvarez and Lidén (2008) |
Rendering and abattoir solid wastes | CSTR; Lab-scale; semi-continuously fed; 35 and 55 °C temp; 1.0 and 1.5 kg VS/m3 day OLRs; 50 days HRT | 0.262–0.572 m3 CH4/kg VS added | Bayr et al. (2012) |
Solid cattle abattoir wastes (ASW), manure, various crops, and municipal solid wastes (MSW) | Anaerobic batch experiment; thermophilic (55 °C) for 70 days: different mixture ratios | 31% increase of the expected CH4 yield at equal mixture of each substrates | Pagés-Díaz et al. (2014); |
Pig abattoir wastes with sewage sludge | Batch and semi-continuous experiments; 35 °C Temp | >50% the methane yield exceeding than mono-digestion | Borowski and Kubacki (2015) |
ASW with manure, various crops, and MSW in different mix ratios | Semi-continuous and batch operation mode | 70–75% methane yield exceeding than mono-digestion | Pagés-Díaz et al. (2015) |
Pasteurized abattoir waste, pig slurry (manure) and glycerine | CSTR; mesophilic temp; 21–33 days HRT; 0.8–3.2 kg COD/m3 day OLR | 153% CH4 yield increment | (Rodríguez-Abalde et al. 2017) |
Food waste (FW) with abattoir waste (AW) and sewage sludge(MSS) | Lab-scale reactor; semi-continuous operation; mesophilic conditions; 30 SRT | 0.63 m3 CH4/kg VS fed for (FW+ AW) | Borowski et al. (2018) |
0.46 m3 CH4/kg VS fed for (FW + MSS) | |||
Pig abattoir by-products (5% pork by-products mixed with pig manure) | CSTR; batch and semi-continuously fed; 37 °C temp (mesophilic) | 40% higher CH4 production compared to AD of manure alone | Hejnfelt and Angelidaki (2009) |
FVW and abattoir wastewater (AWW) | Single-stage ASBR; mesophilic temp; 20 days HRT; 2.56 g TVS/l day OLR (30%FVW:70%AW) | 75% biogas yield improved | Bouallagui et al. (2009b) |
FVW, fish waste, AWW and waste activated sludge | ASBR; mesophilic temp; 10 days HRT; 2.46–2.51 g VS/l day OLR | 43.8–51.5% biogas yield | Bouallagui et al. (2009a) |
Olive mill wastewater with AWW | Upflow anaerobic filter; batch; mesophilic | 44.2% more biogas yield of the mixture than AWW mono-digestion | Gannoun et al. (2007) |
Cattle abattoir wastewater with FVW in different proportion | Unstirred two-staged ASBR; mesophilic temp; semi-continuous fed | 70.26% more biogas yield and 57.11% VS reduction of the mixture than AWW mono-digestion | This study |