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XIII

LIST OF TABLES

Page

Table 2.1 Physical and chemical characteristics of skim latex serum 8

Table 2.2 Physical and chemical characteristics of palm oil mill effluent 9

Table 2.3 Hydrogen and methane production from anaerobic digestion 10

of POME under mesophilic and thermophilic conditions

Table 3.1 Physical and chemical characteristics of skim latex serum and 29

palm oil mill effluent

Table 3.2 Experimental variables and concentration levels investigated by using central 26
composite design
Table 3.3 Central composite experimental design matrix defining NaHCO 3, 27

Na 2HPO 4.12H 2O and EFB ash concentrations on hydrogen production yield

Table 3.4 Analysis of variance (ANOVA) for the regression model 35
Table 3.5 Model coefficients estimated by multiples linear regression 35

(significance of regression coefficients), where X 1 =NaHCO 3 concentration (g/L),

X 2 =Na 2HPO 4.12H 2O concentration (mg/L) and X 3 = EFB ash concentration (g/L)

Table 3.6 pH and results on hydrogen production yield achieved from buffer and macro- 36

nutrient optimization stage.

Table 3.7 Soluble metabolites obtained from different mixing ratio of SLS to POME 39

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

Table 3.8 Soluble metabolites obtained from different mixing ratio of SLS to POME 41

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

Table 3.9 Soluble metabolite products and COD balance obtained from different 43

mixing ratio of SLS to POME with initial organic loading of 7 g-VS added/L

at the end of fermentation

Table 3.10 Soluble metabolite products achieved from methane production in 45

batch experiment