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Fig. 2.2 Process involved in milling of oil palm (Rupani et al., 2010).

Recently, most of latex concentrates plants and palm oil mill plants, SLS and POME have
been used as substrate to produce biogas in Malaysia and Thailand (Jawjit et al., 2010).

2.2 The biogas process

Anaerobic digestion process is a biological multi-step process with a specific groups of
microorganisms involved in each individual step under the absence of oxygen to break down or