The Effect of Enzyme Addition on the Anaerobic Digestion …
129
content for anaerobic digestion which is in the range of 77–86%, which fall in the
ideal range of 60–90%.
4 Conclusion
The anaerobic digestion of food waste has been conducted. The effects of lipase
addition on the Total Organic Carbon (TOC), pH, conductivity and moisture content have been investigated. The addition of lipase has improved the phycochemical
properties of the food waste digestate in terms of moisture content and TOC. The
addition of lipase shows significant effect of the pH and conductivity for the first
10 days of digestion. However, it has no effect on the final pH and conductivity
of the digestate at the end of the digestion process. Based on the findings, it was
also found that the lipase used in the present work did not improve the production
of biogas. Overall, it can be concluded that the addition of lipase has successfully
enhanced the degradation rate but inhibited the biogas production. Therefore, further
works such as screening on the type of lipase and optimisation on lipase amount are
needed to achieve the desired results.
References
Agamuthu, P., & Fauziah, S. H. (2011). Challenges and issues in moving towards sustainable
landfilling in a transitory country - Malaysia. Waste Management & Research, 29, 13–19.
Ajay, K. J., et al. (2011). Research advances in dry anaerobic digestion process of solid organic
wastes. African Journal of Biotechnology, 10(65), 14242–14253.
Banks, C. J., et al. (2012). Trace element requirements for stable food waste digestion at elevated
ammonia concentrations. Bioresource Technology, 104, 127–135.
Bazrafshan, E. et al. (2016) Maturity and stability evaluation of composted municipal solid wastes.
5(1), 1–9.
Bouallagui, H., et al. (2003). Mesophilic biogas production from fruit and vegetable waste in a
tubular digester. Bioresource Technology, 86(1), 85–89.
Capson-Tojo, G. et al. (2016) Food waste valorization via anaerobic processes: A review. Reviews
in Environmental Science and Biotechnology, 15(3), 499–547.
Carucci, G., Carrasco, F., Trifoni, K., & Majone, M. (2005). Anaerobic digestion of food industry
wastes: Effect of codigestion on methane yield. Journal of Environmental Engineering, 131(7),
1037–1045.
Chan, M. T., Selvam, A., & Wong, J. W. C. (2016) Reducing nitrogen loss and salinity during
“struvite” food waste composting by zeolite amendment. Bioresource Technology, 200, 838–844.
(Elsevier Ltd).
Dai, X., et al. (2013). High-solids anaerobic co-digestion of sewage sludge and food waste in comparison with mono digestions: Stability and performance. Waste Management, 33(2), 308–316.
Domingues, R. F., et al. (2015). Effect of enzymatic pretreatment on the anaerobic digestion of milk
fat for biogas production. Food Research International, 73, 26–30. Elsevier Ltd.
Dors, G., & Mendes, A. A. (2013). Simultaneous enzymatic hydrolysis and anaerobic biodegradation of lipid-rich wastewater from poultry industry, 343–349.
129
content for anaerobic digestion which is in the range of 77–86%, which fall in the
ideal range of 60–90%.
4 Conclusion
The anaerobic digestion of food waste has been conducted. The effects of lipase
addition on the Total Organic Carbon (TOC), pH, conductivity and moisture content have been investigated. The addition of lipase has improved the phycochemical
properties of the food waste digestate in terms of moisture content and TOC. The
addition of lipase shows significant effect of the pH and conductivity for the first
10 days of digestion. However, it has no effect on the final pH and conductivity
of the digestate at the end of the digestion process. Based on the findings, it was
also found that the lipase used in the present work did not improve the production
of biogas. Overall, it can be concluded that the addition of lipase has successfully
enhanced the degradation rate but inhibited the biogas production. Therefore, further
works such as screening on the type of lipase and optimisation on lipase amount are
needed to achieve the desired results.
References
Agamuthu, P., & Fauziah, S. H. (2011). Challenges and issues in moving towards sustainable
landfilling in a transitory country - Malaysia. Waste Management & Research, 29, 13–19.
Ajay, K. J., et al. (2011). Research advances in dry anaerobic digestion process of solid organic
wastes. African Journal of Biotechnology, 10(65), 14242–14253.
Banks, C. J., et al. (2012). Trace element requirements for stable food waste digestion at elevated
ammonia concentrations. Bioresource Technology, 104, 127–135.
Bazrafshan, E. et al. (2016) Maturity and stability evaluation of composted municipal solid wastes.
5(1), 1–9.
Bouallagui, H., et al. (2003). Mesophilic biogas production from fruit and vegetable waste in a
tubular digester. Bioresource Technology, 86(1), 85–89.
Capson-Tojo, G. et al. (2016) Food waste valorization via anaerobic processes: A review. Reviews
in Environmental Science and Biotechnology, 15(3), 499–547.
Carucci, G., Carrasco, F., Trifoni, K., & Majone, M. (2005). Anaerobic digestion of food industry
wastes: Effect of codigestion on methane yield. Journal of Environmental Engineering, 131(7),
1037–1045.
Chan, M. T., Selvam, A., & Wong, J. W. C. (2016) Reducing nitrogen loss and salinity during
“struvite” food waste composting by zeolite amendment. Bioresource Technology, 200, 838–844.
(Elsevier Ltd).
Dai, X., et al. (2013). High-solids anaerobic co-digestion of sewage sludge and food waste in comparison with mono digestions: Stability and performance. Waste Management, 33(2), 308–316.
Domingues, R. F., et al. (2015). Effect of enzymatic pretreatment on the anaerobic digestion of milk
fat for biogas production. Food Research International, 73, 26–30. Elsevier Ltd.
Dors, G., & Mendes, A. A. (2013). Simultaneous enzymatic hydrolysis and anaerobic biodegradation of lipid-rich wastewater from poultry industry, 343–349.