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Biosolids Process Enhancements for Fecal Coliform Reduction

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Approximately 60 percent of wastewater utilities across the nation land apply biosolids for agricultural use. Most utilities, including HRSD, have traditionally used the time and temperature method to demonstrate compliance with state and federal regulations. Recent research suggests the possibility that some dewatering processes following digestion may exhibit re-activation and/or re-growth of fecal coliform bacteria. A series of tests were initiated to measure fecal coliform levels in biosolids cake generated at the Atlantic Treatment Plant. Initial test results indicated an increase in fecal coliform bacteria concentrations after dewatering. HRSD conducted additional tests in June through December 2006 to determine methods of preventing the fecal coliform re-activation/re-growth phenomenon. This paper presents the finding of this testing and reports on the methodologies used, the options tested, and the efficiency of a low lime dosing process in meeting the operating objectives.
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  • Water Practice™ publishes peer-reviewed articles and reports focusing on applied water studies. Topics include monitoring, facility operations and maintenance, management, policy, and other issues of interest and concern to water practitioners. The Journal publishes on a monthly to bi-monthly basis and is available online only.
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