Improvement of dairy manufacture effluent anaerobic digestion with biological waste addition using a Chinese dome digester.
Anaerobic co-digestion of dairy manufacture effluent (DME) and biological waste (BW) was investigated at various DME/BW ratios using laboratory batch digesters. The biogas yield ranged 0.34-0.88l biogas g(-1) volatile solids (VS) removed. The highest VS reductions of 58% and 62% were obtained for DME/BW ratios of 60:40% and 80:20%, respectively. Results were used to operate a pilot-scale digester of 5m(3). The highest biogas yield of 0.48lg(-1) VS removed was obtained at an organic loading rate (OLR) of 1.64gVSl(-1)d(-1) corresponding to a DME/BW ratio of 80:20%. This could be mainly attributed to the higher biodegradability of DME and the correction of the C:N ratio by the addition of the BW. The N, P and K contents were increased significantly in the TS of the digestate to be around 6.8%, 0.64% and 1.26%, respectively.
Jihen
Toumi
T
UR-Biodiversity and Biology of Populations, High Institute of Applied Biological Sciences, Street of Zouheir ESSAFI 1007 Tunis, Tunisia.
Hassib
Bouallagui
B
Moktar
Hamdi
H
Said
Nouira
N
D000468:Alkalies; D000693:Anaerobiosis; D002681:China; D003612:Dairying; D006863:Hydrogen-Ion Concentration; D010865:Pilot Projects
D000468:Alkalies