Food waste (FW) is one of the most common and ever-increasing types of municipal solid waste. Due to its high water content and readily biodegradable characteristics, treatment of FW through anaerobic digestion (AD) is the most sustainable method. With regard to the recently amended EU Regulation EC 1774/2002, pretreatment of FW can be applied in order to enhance the methane production. The effect of thermal and chemical (ozonation) pretreatment of FW on mesophilic AD was studied through batch experiments. Synthetic FW was pretreated at low temperatures (70-1200C) for 60 minutes and at high temperatures of 1400C and 1500C for 30 minutes, with respect to the regulation. As chemical method, varies doses (0.034 – 0.202 gO3/gTS) of ozonation were investigated. Based on the cumulative methane yield, the cost benefit analyses of the pretreatment methods were estimated. First set of experiment on thermally pretreated substrates lasted 154-189 days, where the net methane yield of untreated FW was 415.4±3.2 ml/gVS. The pretreatment resulted in the cumulative methane production 23 (CMP) of 15.7±0.2%, 35.4±3%, 30.2±5.6%, 11.9±2.2% at temperatures of 700C, 800C, 1000C, 1200C, respectively. While CMP of substrates pretreated at high temperatures of 1400C and 1500C were increased by 6.9±3.2% and 5±0% respectively. These results suggest that thermal pretreatment caused the degradation of higher molecules, thus enhancing the anaerobic biodegradability. Based on the cost benefit analysis the highest methane yields of thermal pretreatment could result in 4.9±1.1 euro/ton FW. However, it should be noted that this estimation was based on the cumulative production of batch experiments, thus continuous experiments could result in different figures. Second set of experiment on AD of ozonated FW lasted 172-190 days. Net methane yield of untreated FW was 440.3±2.6 ml/gVS. The ozonated FW produced less amount of biogas during the initial 10-15 days as compared to the untreated substrate. However, at the end of the experiment CMP was increased by 39.8±0.5%, 51.0±1.7%, 37.7±1.0%, 27.1±2.0% at ozone doses of 0.034 gO3/gTS, 0.068 gO3/gTS, 0.101 gO3/gTS, 0.202 gO3/gTS, respectively. According the cost benefit analysis the best scenario for ozonation pretreatment could result in benefit of 8.2±0.6 euro/ton FW. However, considering that ozonated FW produced less amount of biogas during the initial 10-15 days as compared to the untreated substrate, ozonation might not be the best option for FW.

Cost Benefit Analyses of Pretreatment Methods to Enhance Anaerobic Digestion of Food Waste / Ariunbaatar, J.; Panico, A.; Frunzo, Luigi; Esposito, G.; Pirozzi, Francesco; Lens, P. N. L.; Esposito, Giovanni. - (2013), pp. 1-10. (Intervento presentato al convegno Internationl Solid Waste Association (ISWA) 2013 World Congress tenutosi a Vienna, Austria nel 7-11 October 2013).

Cost Benefit Analyses of Pretreatment Methods to Enhance Anaerobic Digestion of Food Waste

FRUNZO, LUIGI;PIROZZI, FRANCESCO;ESPOSITO, GIOVANNI
2013

Abstract

Food waste (FW) is one of the most common and ever-increasing types of municipal solid waste. Due to its high water content and readily biodegradable characteristics, treatment of FW through anaerobic digestion (AD) is the most sustainable method. With regard to the recently amended EU Regulation EC 1774/2002, pretreatment of FW can be applied in order to enhance the methane production. The effect of thermal and chemical (ozonation) pretreatment of FW on mesophilic AD was studied through batch experiments. Synthetic FW was pretreated at low temperatures (70-1200C) for 60 minutes and at high temperatures of 1400C and 1500C for 30 minutes, with respect to the regulation. As chemical method, varies doses (0.034 – 0.202 gO3/gTS) of ozonation were investigated. Based on the cumulative methane yield, the cost benefit analyses of the pretreatment methods were estimated. First set of experiment on thermally pretreated substrates lasted 154-189 days, where the net methane yield of untreated FW was 415.4±3.2 ml/gVS. The pretreatment resulted in the cumulative methane production 23 (CMP) of 15.7±0.2%, 35.4±3%, 30.2±5.6%, 11.9±2.2% at temperatures of 700C, 800C, 1000C, 1200C, respectively. While CMP of substrates pretreated at high temperatures of 1400C and 1500C were increased by 6.9±3.2% and 5±0% respectively. These results suggest that thermal pretreatment caused the degradation of higher molecules, thus enhancing the anaerobic biodegradability. Based on the cost benefit analysis the highest methane yields of thermal pretreatment could result in 4.9±1.1 euro/ton FW. However, it should be noted that this estimation was based on the cumulative production of batch experiments, thus continuous experiments could result in different figures. Second set of experiment on AD of ozonated FW lasted 172-190 days. Net methane yield of untreated FW was 440.3±2.6 ml/gVS. The ozonated FW produced less amount of biogas during the initial 10-15 days as compared to the untreated substrate. However, at the end of the experiment CMP was increased by 39.8±0.5%, 51.0±1.7%, 37.7±1.0%, 27.1±2.0% at ozone doses of 0.034 gO3/gTS, 0.068 gO3/gTS, 0.101 gO3/gTS, 0.202 gO3/gTS, respectively. According the cost benefit analysis the best scenario for ozonation pretreatment could result in benefit of 8.2±0.6 euro/ton FW. However, considering that ozonated FW produced less amount of biogas during the initial 10-15 days as compared to the untreated substrate, ozonation might not be the best option for FW.
2013
Cost Benefit Analyses of Pretreatment Methods to Enhance Anaerobic Digestion of Food Waste / Ariunbaatar, J.; Panico, A.; Frunzo, Luigi; Esposito, G.; Pirozzi, Francesco; Lens, P. N. L.; Esposito, Giovanni. - (2013), pp. 1-10. (Intervento presentato al convegno Internationl Solid Waste Association (ISWA) 2013 World Congress tenutosi a Vienna, Austria nel 7-11 October 2013).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/572420
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