Anaerobic digestion of autoclaved and untreated food waste

详细信息    查看全文

• 作者：Elina Tampio ; Satu Ervasti ; Teija Paavola ; Sonia Heaven ; Charles Banks ; Jukka Rintala
• 关键词：Food waste ; Anaerobic digestion ; Autoclave treatment ; Organic loading rate ; Nitrogen
• 刊名：Waste Management
• 出版年：February, 2014
• 年：2014
• 卷：34
• 期：2
• 页码：370-377
• 全文大小：466 K

文摘

Anaerobic digestion of autoclaved (160 掳C, 6.2 bar) and untreated source segregated food waste (FW) was compared over 473 days in semi-continuously fed mesophilic reactors with trace elements supplementation, at organic loading rates (OLRs) of 2, 3, 4 and 6 kg volatile solids (VS)/m³ d. Methane yields at all OLR were 5-10% higher for untreated FW (maximum 0.483 卤 0.013 m³ CH₄/kg VS at 3 kg VS/m³ d) than autoclaved FW (maximum 0.439 卤 0.020 m³ CH₄/kg VS at 4 kg VS/m³ d). The residual methane potential of both digestates at all OLRs was less than 0.110 m³ CH₄/kg VS, indicating efficient methanation in all cases. Use of acclimated inoculum allowed very rapid increases in OLR. Reactors fed on autoclaved FW showed lower ammonium and hydrogen sulphide concentrations, probably due to reduced protein hydrolysis as a result of formation of Maillard compounds. In the current study this reduced biodegradability appears to outweigh any benefit due to thermal hydrolysis of ligno-cellulosic components.