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XI
CONTENTS (Continued)
Page
3.4.3 Effect of NaHCO 3, Na 2HPO 4.12H 2O and EFB ash concentrations 33
on biohydrogen production
3.4.4 Soluble metabolite products and COD balance 36
3.4.5 Methane potential of co-fermentation of SLS and POME 44
3.5 Conclusions 46
CHAPTER IV Thermophilic dark co-digestion of skim latex serum (SLS) and 47
palm oil mill effluent (POME) to sequentially produce hydrogen
and methane
4.1 Abstract 47
4.2 Introduction 48
4.3 Materials and methods 49
4.3.1 Inoculum preparation 49
4.3.2 Skim latex serum 50
4.3.3 Palm oil mill effluent 50
4.3.4 Experimental set-up and operation 51
4.3.5 Analytical methods 53
4.4 Results and discussion 53
4.4.1 H 2-CSTR experiments 53
4.4.2 CH 4-UASB experiments 58
4.4.3 Energy achieved from two-stage co-digestion of SLS with POME 61
4.5 Conclusions 62
CHAPTER V Conclusions 63
5.1 Summary 63
5.2 Suggestions 64
REFERENCES 65
