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Effect of MW energy on E. coli reduction in a1) 20 g sludge sample and b1) 100 g sludge sample, and E. coli reduction as a function of time in a2) 20 g sludge sample and b2) 100 g sludge sample. The zero E. coli log removal corresponds to an initial concentration of 4.0 × 108 CFU/g TS).
