Full Scale Application of a Novel Sludge Ozonation Process for Achieving 40% and up to 80% Excess Sludge Reduction at a 25,000 rrv/day Municipal Wastewater Plant

摘要

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 2). 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 (1100 m~3/h) 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.