POTENTIAL BIOGAS PRODUCTION FROM FISH WASTE AND ...

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Chen Shi TRITA LWR Degree Project 12:37Fig. 16 Methane potential of Group B (containing 50% sludge) based on flow rate.In order to make the result analysis more clear and accurate, three typicalratios of cod meat and cod intestine in both groups were chosen to beanalyzed. Those were digested in the same test, so the errors in thepreparation works between two tests could be avoided (Fig. 19). After13 days digestion, all MP in the chosen ratios of cod meat and intestinewere showed that mixed with 33 % sludge had higher capability of CH 4yield than mixed with 50 % sludge especially for the comparison of A1and B1. In addition, the difference of MP between A1 and B1 after13 days was 0.131 Nm 3 CH 4/kg VS larger than it between A5 and B5.The 33 % sludge mixed with substrates had higher flow rate of CH 4 andobtained more CH 4 production to compare with Group B mixing with50 % sludge (Fig. 20).All in all, the final optimal proportion of substrate was 33 % sludgemixed with 45 % cod meat and 22 % cod intestine, which had thehighest MP, i.e. 0.533 Nm 3 CH 4/kg VS (Table 8).Fig. 17 The relationship between cod meat content and biogas yield in the 50%sludge mixed substrates.24
Potential Biogas Production from Fish Waste and SludgeFig. 18 Methane potential of Group A and Group B based on accumulated gasvolume.5. DISCUSSION5.1. VSRIn this chapter, the availability of VSR to evaluate the biodegradability ofsubstance is discussed. In addition, the analysis of results includingcomparison to other literature and pre-studies is decribed likewise. Lastbut not least, the weakness in the experiment is also mentioned.The value of VSR depends on the initial and final VS content. But, whenthe initial VS content was measured, some organic materials contributedto produce CO 2 and the easily volatile substance like alcohol were alsoincluded in the VS content. So VSR could not represent the capability ofCH 4 production accurately. In addition, if the final VS content was tooFig. 19 Methane potential of typical ratios in Group A & B based on accumulatedgas volume.25
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