Abstract
Biogas production from cassava (Manihot esculentus) peels and pig dung under a mesophilic temperature condition was investigated. Three blends of the wastes and a control labeled as B1, B2, B3 and C representing blend 1 (50:50 peel/dung), blend 2 (30:70 peel/dung), blend 3 (10:90 peel/dung) and control (pig dung alone) were used, respectively. Biodigestion of the wastes blends and control was carried out simultaneously under the same environmental and operational conditions of 30 days retention period using four metallic biodigesters of 32 L capacity each. The biogas yield result shows that blend 2 yielded the highest cumulative biogas of 78.5 L, while the least yield of 61.7 L was obtained by blend 3. When compared with the control set up and biodigestion of cassava waste alone from literature, there was blending effect resulting in increase in yield of biogas over the sole digestion of cassava peel or pig dung. Methane production leading to the combustibility of the biogas started at 6th, 5th, 5th and 4th days for B1, B2, B3 and C, respectively. This, in agreement with earlier studies show that better handling of cassava peels for energy production would be achieved by blending it with animal wastes in the right proportion. Key words: Cassava peel, biogas, co-digestion, anaerobic digestion, wastes blends, lag days.
Highlights
One of the main environmental problems of today’s society is the continuous increase in production of organic wastes which are harmful to human existence
Methane production leading to the combustibility of the biogas started at 6th, 5th, 5th and 4th days for blend 1 (B1), blend 2 (B2), B3 and C, respectively
It has been shown that biogas yield from anaerobic digestion (AD) of wastes depends on a number of factors such as pH, HRT and CN ratio (Yadika et al, 2004)
Summary
One of the main environmental problems of today’s society is the continuous increase in production of organic wastes which are harmful to human existence. Some of the waste types which are posing serious environmental threats to human and animal existence in these nations come from agriculture due to their degradable nature and lack of profitable technique to convert these ‘wastes’ to better manure quality or other useful means such as energy. World cassava production in 2002 was estimated at 184 million tonnes (Odoemenem and Otanwa, 2011). It has been projected that total world cassava utilization would hit 275 million tons by 2020 (IFPRI, 2008; Arowolo and Adaja, 2012) while some researchers estimate this number closer to 291 million tons
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