Anaerobically digested sludge dewatered by belt filter press is tested for fecal coliform density by the CFU (colony-forming units) method as specified by EPA for application of biosolids on agricultural land (Section 13.28). The results of seven sludge samples collected and tested on consecutive days expressed in number of fecal coliforms per gram of total solids (dry weight) arc as follows: 140,000; 320,000; 130,000; 330,000; 300,000; 220,000; and 305 ,000. Calculate the average density based on geometric mean for these data. (Geometric mean of a number is the logarithm to base 10.) Does this sludge meet the pathogen reduction fo r Class B biosolids?
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