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Ozonation was studied as a non‐specific means of sludge bulking control. Direct ozonation at 6 g/m3 influent, i.e. 4 gO3/kg sludge per day into the aeration basin of a 150 l/d Phoredox system controlled the growth of filamentous organisms and improved the settleability of the sludge. Bulking control with ozone is not significantly more expensive than with chlorine or with larger settler capacity.
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Leeuwen et al. (1988) studied this question.
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