CONCLUSION
The results show that the addition of different
strengths of caustic improved gas yield from 1 to 3%
wt/wt sodium hydroxide solution, however a decrease was
observed from 5% wt/wt sodium hydroxide treatment.
Therefore if the pH of the system is maintained at that
prevalent for 3% wt/wt caustic treatment, more gas will be
produced. The statistical analysis reveals the applicability
of digester as a biogas production model. The high F
value of 60.29 reveal the high volume of gas generated at
alkaline condition.