Semi-continuous anaerobic co-digestion of chicken litter with agricultural and food wastes: A case study on the effect of carbon/nitrogen ratio, substrates mixing ratio and organic loading.
In this study, four agro-industrial substrates, chicken litter (CL), food waste (FW), wheat straw (WS) and hay grass (HG) were assessed as feedstock for anaerobic digestion (AD) under semi-continuous conditions at organic loading rates (OLRs) of 2.0-3.0 g TS/L.d and hydraulic retention time (HRT) of 20 days. Six different substrate mixtures were prepared such that the C/N ratio of each was 20 or more. Using principal component analysis 68.1% of data variability was explained. Biogas production from CL, as a single substrate, was 181.3 ± 9.8mLN biogas/g VSadded at OLR of 2.0gTS/L.d. The optimum substrates mixture was CL:FW:WS 60:20:20, where 73.0%, 167.2% and 116.9% increase in total biogas production at OLR of 2.0, 2.5, 3.0gTS/L.d, respectively, compared to that from CL, was obtained. Digestate sequential fractionation revealed carbohydrate degradation is an important factor that can explain the variation in performance and production of biogas for feedstocks of balanced C/N ratio.
['Zahan|Zubayeda|Z|', 'Georgiou|Stelios|S|', 'Muster|Tim H|TH|', 'Othman|Maazuza Z|MZ|']
D000383:Agriculture D000693:Anaerobiosis D000818:Animals D056804:Biofuels D002244:Carbon D002645:Chickens D005502:Food D009584:Nitrogen D012037:Refuse Disposal D014908:Triticum
Chicken litter Food wastes Wheat straw Hay grass Organic loading rate C/N ratio Anaerobic digestion reactor performance Continuous anaerobic co-digestion Lignocellulose fractionation PCA analysis