caa a22 4500 465823831 CHVBK 20180323112143.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF00604947 doi (NATIONALLICENCE)springer-10.1007/BF00604947 Microbial populations and sludge characteristics in thermophilic aerobic sewage sludge digestion [Elektronische Daten] [Peter Burt, Simon Morgan, Brian Dancer, John Fry] Summary: Estimates of bacterial numbers from raw sewage sludge and sludge treated by thermophilic aerobic digestion were compared with simple indicators of sludge quality and concentrations of potential substrates. Significant differences were found between sludge types for all but one of the variables examined (frequency of dividing cells). During a stable period of digestor operation, the average number of viable obligate thermophiles present in digested sludge (1.63 × 106 ml−1) was approximately 102-fold greater than in feed sludge (1.10 × 104 ml−1). Total numbers of bacteria were slightly greater in digested sludge (3.24 × 1010 ml−1) than in feed sludge (2.39 × 10 ml−10), as were viable counts of bacteria at incubation temperatures of 37°C and 55°C. Significant correlation was found between viable counts of bacteria at 37°C and 55°C for digested sludge, and 65°C and 55°C for feed sludge. The numbers of obligate thermophiles present and the total of bacteria present were related to the temperature and pH of the digested sludge and inversely related to the numbers ofEscherichia coli and coliforms present, which were not detected at temperatures greater than 50°C. Springer-Verlag, 1990 Burt Peter School of Pure and Applied Biology, University of Wales College of Cardiff, PO Box 915, CF1 3TL, Cardiff, UK aut Morgan Simon Electricity Council Research Centre, CH1 6ES, Capenhurst, Chester, UK aut Dancer Brian School of Pure and Applied Biology, University of Wales College of Cardiff, PO Box 915, CF1 3TL, Cardiff, UK aut Fry John School of Pure and Applied Biology, University of Wales College of Cardiff, PO Box 915, CF1 3TL, Cardiff, UK aut Applied Microbiology and Biotechnology Springer-Verlag 33/6(1990-09-01), 725-730 0175-7598 33:6<725 1990 33 253 https://doi.org/10.1007/BF00604947 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00604947 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Burt Peter School of Pure and Applied Biology, University of Wales College of Cardiff, PO Box 915, CF1 3TL, Cardiff, UK aut NATIONALLICENCE 700 1- Morgan Simon Electricity Council Research Centre, CH1 6ES, Capenhurst, Chester, UK aut NATIONALLICENCE 700 1- Dancer Brian School of Pure and Applied Biology, University of Wales College of Cardiff, PO Box 915, CF1 3TL, Cardiff, UK aut NATIONALLICENCE 700 1- Fry John School of Pure and Applied Biology, University of Wales College of Cardiff, PO Box 915, CF1 3TL, Cardiff, UK aut NATIONALLICENCE 773 0- Applied Microbiology and Biotechnology Springer-Verlag 33/6(1990-09-01), 725-730 0175-7598 33:6<725 1990 33 253 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer