The effect of fish waste (FW), abattoir wastewater (AW) and waste activated sludge (WAS) addition as cosubstrates
on the fruit and vegetable waste (FVW) anaerobic digestion performance was investigated
under mesophilic conditions using four anaerobic sequencing batch reactors (ASBR) with the aim of
finding the better co-substrate for the enhanced performance of co-digestion. The reactors were operated
at an organic loading rate of 2.46–2.51 g volatile solids (VS) l1 d1, of which approximately 90%
were from FVW, and a hydraulic retention time of 10 days. It was observed that AWand WAS additions
with a ratio of 10% VS enhanced biogas yield by 51.5% and 43.8% and total volatile solids removal by 10%
and 11.7%, respectively. However FW addition led to improvement of the process stability, as indicated by
the low VFAs/Alkalinity ratio of 0.28, and permitted anaerobic digestion of FVW without chemical alkali
addition. Despite a considerable decrease in the C/N ratio from 34.2 to 27.6, the addition of FW slightly
improved the gas production yield (8.1%) compared to anaerobic digestion of FVW alone. A C/N ratio
between 22 and 25 seemed to be better for anaerobic co-digestion of FVW with its co-substrates. The
most significant factor for enhanced FVW digestion performance was the improved organic nitrogen
content provided by the additional wastes. Consequently, the occurrence of an imbalance between the
different groups of anaerobic bacteria which may take place in unstable anaerobic digestion of FVW
could be prevented.
The effect of fish waste (FW), abattoir wastewater (AW) and waste activated sludge (WAS) addition as cosubstrateson the fruit and vegetable waste (FVW) anaerobic digestion performance was investigatedunder mesophilic conditions using four anaerobic sequencing batch reactors (ASBR) with the aim offinding the better co-substrate for the enhanced performance of co-digestion. The reactors were operatedat an organic loading rate of 2.46–2.51 g volatile solids (VS) l1 d1, of which approximately 90%were from FVW, and a hydraulic retention time of 10 days. It was observed that AWand WAS additionswith a ratio of 10% VS enhanced biogas yield by 51.5% and 43.8% and total volatile solids removal by 10%and 11.7%, respectively. However FW addition led to improvement of the process stability, as indicated bythe low VFAs/Alkalinity ratio of 0.28, and permitted anaerobic digestion of FVW without chemical alkaliaddition. Despite a considerable decrease in the C/N ratio from 34.2 to 27.6, the addition of FW slightlyimproved the gas production yield (8.1%) compared to anaerobic digestion of FVW alone. A C/N ratiobetween 22 and 25 seemed to be better for anaerobic co-digestion of FVW with its co-substrates. Themost significant factor for enhanced FVW digestion performance was the improved organic nitrogencontent provided by the additional wastes. Consequently, the occurrence of an imbalance between thedifferent groups of anaerobic bacteria which may take place in unstable anaerobic digestion of FVW
could be prevented.
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