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The Effect of Digestion and Dewatering on Sudden Increases and Regrowth of Indicator Bacteria after Dewatering
Author(s) -
Chen YenChih,
Murthy Sudhir N.,
Hendrickson Donald,
Araujo Gordon,
Higgins Matthew J.
Publication year - 2011
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143010x12851009156727
Subject(s) - dewatering , mesophile , biosolids , centrifuge , anaerobic digestion , pulp and paper industry , environmental science , thermophile , chemistry , waste management , filter cake , sedimentation , environmental engineering , bacteria , geotechnical engineering , methane , biology , geology , sediment , engineering , biochemistry , paleontology , physics , organic chemistry , nuclear physics , genetics , enzyme
Several investigators have reported higher densities of indicator bacteria after dewatering of anaerobically digested biosolids. The increases appear to occur at two points in the biosolids process: the first, referred to as “sudden increase”, occurs immediately after dewatering; the second, “regrowth”, occurs during storage over longer periods. The objectives of this study were to examine the effect of digestion and dewatering processes on sudden increase and regrowth of fecal coliform and E. coli . Samples were collected from five thermophilic and five mesophilic digestion processes, with either centrifuge or belt filter press dewatering. Sudden increase typically was observed in the thermophilic processes with centrifuge dewatering and was not observed in the mesophilic processes with either centrifuge or belt filter press dewatering. Regrowth was observed in both thermophilic and mesophilic processes with centrifuge dewatering but not belt filter press dewatering.