Key result
Mesophilic digestion with subsequent consolidation achieved the most efficient reduction in infectious virus titer, though no treatment consistently produced sludge with undetectable virus levels.
Mesophilic digestion with subsequent consolidation is the most efficient treatment for reducing infectious enterovirus titers in sewage sludge, though no treatment consistently produced undetectable levels.
Mesophilic digestion with consolidation may best reduce viruses in sewage sludge; leaves open scalable validation for wastewater safety.
We examined different types of raw sewage sludge treatment, including consolidation, anaerobic mesophilic digestion with subsequent consolidation, and aerobic-thermophilic digestion. Of these, the most efficient reduction in infectious virus titer was achieved by mesophilic digestion with subsequent consolidation, although a pilot-scale aerobic-thermophilic digester was extremely time effective, producing sludges with similarly low virus titers in a small fraction of the time. Although none of the treatments examined consistently produced a sludge with undetectable virus levels, mesophilic digestion alone was found to be particularly unreliable in reducing the levels of infectious virus present in the raw sludge.
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Goddard et al. (1981) studied Sewage sludge. Sewage sludge treatments (consolidation, anaerobic mesophilic digestion, aerobic-thermophilic digestion) was evaluated on Reduction in infectious virus titer. Mesophilic digestion with subsequent consolidation achieved the most efficient reduction in infectious virus titer, though no treatment consistently produced sludge with undetectable virus levels.
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