Full Scale Application of a Novel Sludge Ozonation Process for Achieving up to 80% Excess Sludge Reduction at a 25,000 m3/day Municipal Wastewater Plant
Although sludge ozonation in lab scale tests have tended to yield economic dosage rates in the regime of ≤ 0.1 kg O3/kg SS removed, previous attempts to extend the approach to commercial scale installations have resulted in non-economical ozone dosage levels (Sievers et al, 2004; Yasui et al, 1996; Kobayashi et al, 2001; Sakai et al, 1997), requiring as much as 0.395 kg O3 per kg SS removed (See Table 1). In this paper, we discuss a novel approach to sludge ozonation and report the results of full scale tests carried out at a 7 MGD wastewater treatment facility which has been in operation since May 2006. A cost effective Ozone consumption value of 0.07 kg O3/kg SS reduced was attained in the field, demonstrating the successful translation of bench scale type results to field applications using the Praxair approach.
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Document Type: Research Article
Publication date: 01 January 2008
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