Fig. 3.21 portrays the effects of sodium hydroxide pretreatment on biomethane production from cattle manure taken as the average amount of biogas produced by samples from each pretreatment condition i.e. the concentration of the basic solutions. It also highlights the effectiveness of different pretreatment conditions that were applied on the cattle manure. It can be seen that the pretreatment condition which led to the highest biogas production was the 0.3M NaOH solution with a maximum daily output of
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