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Shubiao Wu

Effect of trace elements on anaerobic digestion of food waste

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  • Shubiao Wu
  • Qianqian Lang, China Agricultural University
  • ,
  • Wanqin Zhang, China Agricultural University
  • ,
  • Renjie Dong, China Agricultural University

For the low efficiency and instability of anaerobic digestion of food waste, the effect of trace elements including iron, cobalt, nickel, selenium, molybdenum and tungsten on anaerobic digestion of food waste was investigated under mesophilic condition (37±1)°C using CSTR reactors. The results showed that when hydraulic retention time was 40 d, organic loading rate was 3 g/(L·d), daily methane yield of the reactor with trace elements and control reactor reached to 7.1 L/d and 6.7 L/d, respectively. The methane concentration in two reactors was 62.7% and 61.6%, respectively. When organic loading rate increased to 4 g/(L·d), the methane concentration of the control reactor decreased to 19.5%. However, it could keep stable at around 60% in the reactor with trace elements. Moreover, pH value in the control reactor dropped to 5.24 rapidly which demonstrated the failure of anaerobic digestion process, but it could perform stably at around 7.2 in the reactor with trace elements. A conclusion could be easily drawn that trace elements could improve the methane production efficiency and stability of anaerobic digestion process of food waste under the investigated conditions.

TidsskriftNongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Sider (fra-til)128-132
Antal sider5
StatusUdgivet - nov. 2013
Eksternt udgivetJa

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