Page 16 - 048

XV

LIST OF FIGURES

Page

Figure 1.1 Schematic diagram of research plan for hydrogen and methane production from 5
co-digestion of skim latex serum and palm oil mill effluent under thermophilic
condition
Figure 2.1 Process involved in concentration of natural latex using centrifugation method 8

Figure 2.2 Process involved in milling of oil palm 12

Figure 2.3 Carbon flow diagram of the biogas process 13

Figure 2.4 Flow diagram of two-stage anaerobic process 15

Figure 3.1 Cumulative hydrogen achieved from different mixing ratio of SLS and 32

POME with initial organic loading of 7 g-VS added/L

Figure 3.2 Cumulative hydrogen achieved from different mixing ratio of SLS and 32

POME with initial organic loading of 21 g-VS added/L

Figure 3.3 Hydrogen production yield achieved from different mixing ratio of SLS 33

and POME with initial organic loading of 7 g-VS added/L and 21 g-VS added/L,

respectively

Figure 3.4 Soluble metabolites obtained from different mixing ratio of SLS to POME 38

with initial organic loading of 7 g-VS added/L

Figure 3.5 Soluble metabolites obtained from different mixing ratio of SLS to POME 41

with initial organic loading of 21 g-VS added/L

Figure 3.6 Cumulative methane production achieved from the sequential methane 44

production in batch experiment

Figure 3.7 Methane production yield achieved from the sequential methane production 45

in batch experiment

Figure 4.1 Schematic description of lab-scale bioreactor operation for sequential production 52

of biohydrogen and biomethane which operated under thermophilic temperature