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Effect of addition of organic waste on reduction of Escherichia coli during cattle feces composting under high-moisture condition.

Hanajima D, Kuroda K, Fukumoto Y, Haga K

Pollution Control Laboratory, National Institute of Livestock and Grassland Science, 2, Ikenodai, Tsukuba, Ibaraki 305-0901, Japan. hanadi@affrc.go.jp

To ensure Escherichia coli reduction during cattle feces composting, co-composting with a variety of organic wastes was examined. A mixture of dairy cattle feces and shredded rice straw (control) was blended with organic wastes (tofu residue, rice bran, rapeseed meal, dried chicken feces, raw chicken feces, or garbage), and composted using a bench-scale composter under the high-moisture condition (78%). The addition of organic waste except chicken feces brought about maximum temperatures of more than 55 degrees C and significantly reduced the number of E. coli from 10(6) to below 10(2)CFU/g-wet after seven days composting, while in the control treatment, E. coli survived at the same level as that of raw feces. Enhancements of the thermophilic phase and E. coli reduction were related to the initial amount of easily digestible carbon in mass determined as BOD. BOD value more than 166.2 mg O2/DMg brought about significant E. coli reduction.

Published 19 June 2006 in Bioresour Technol, 97(14): 1626-30.
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