Abstract
In this study, the association between biogas qulaity and digester temperature for selected animal dung-aided water hyacinth digestion mixes was evaluated. Substrates utilized in this study are water hyacinth (WH), poultry manure (PM) and cow dung (CD) and pig dung (PD). Thirty-one (31) co-digestion mix ratios were used in this study. The temperature ranged from 28.6 to 32.2 0C for the PD-aided WH digestion, 28.2 to 31.4 0C for the CD-aided WH digestion and 28.2 to 31.8 0C for the PM-aided WH digestion. This shows that the digestion process occurred within the mesophilic temperature range. The data obtained were analyzed using non-linear parameter estimation. The results revealed that the PM-aided WH mix produced more gas but with less methane content compared to the CDaided and PD-aided WH digestion mix. The results further revealed that the best quality of gas produced by the PD-aided WH digestion. The association between the temperature and gas quality was positive suggesting that an increase in temperature within the digestion leads to an increase in the quality of gas produced. 
 Keywords: Biogas quality, temperature, co-digestion, animal dung, water hyacinth
Highlights
Temperature is a key process parameter that influences the design of anaerobic digesters as well as gas production rate during anaerobic digestion
The temperature ranged from 28.6 to 32.2 °C for the pig dung (PD) - aided water hyacinth (WH) digestion. This shows that the digestion process occurred within the mesophilic temperature range, which, according to Wang et al (2009), is ideal for Anaerobic Digestion
The temperature ranged from 28.6 to 32.2 0C for the PD-aided WH digestion, 28.2 to 31.4 0C for the cow dung (CD)-aided WH digestion and 28.2 to 31.8 0C for the poultry manure (PM)-aided WH digestion. This shows that the digestion process occurred within the mesophilic temperature range, which is ideal for AD as this temperature range adequately supports microbial activities within the digester (Wang et al, 2009)
Summary
Temperature is a key process parameter that influences the design of anaerobic digesters as well as gas production rate during anaerobic digestion. Mesophilic and thermophilic conditions present different reactor design and operational advantages and drawbacks During thermophilic digestion both greater destruction of pathogens and higher substrate degradation can be achieved, but the microbe population is more sensitive to environmental conditions such as temperature fluctuations, changes in organic loading and pH (Angelidaki et al, 2007; Chen et al, 2008; Gerardi, 2003; Poliafico, 2007). According to Parker et al (2002), Ward (2008) and Angelidaki et al (2007), most anaerobic digesters are designed to operate in either the mesophilic or thermophilic temperature respectively range (with optima at 35 and 55 °C) to maximize biogas yield. Parker et al (2002) recommended an operating temperature in the middle of the mesophilic temperature range for improved performance with a high solids anaerobic digester using cattle manure. MTS is the mass of total solids, X is the mass of fresh substrate, Y is the mass of water added to get 8% total solids in the digester
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