Bacterial removal by anaerobic digestion |
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Authors: | Mohamed M El-Abagy Helmy T El-Zanfaly |
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Institution: | Water Pollution Control Laboratory, National Research Centre, Dokki, Cairo, Egypt |
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Abstract: | The impact of anaerobic digestion and post composting of the digested slurry on total bacterial counts, total coliform, fecal coliform, and fecal streptococci was investigated. Anaerobic digestion removed up to 99% of the bacterial parameters; however, the residual numbers present in the digested slurry were still high. The residuals ranged from 105/g to 1013/g for total bacterial counts, 102/g to 108/g for total coliform, 104/g to 108/g for fecal coliform, and 102/g to 108/g for fecal streptococci. The digested slurry was mixed with soil for one week and then for two months, but the density of bacterial parameters was not reduced. There was an increase in numbers during the two composting steps. |
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