OVERVIEW CHALLENGES The Dubai Investments Park Wastewater Treatment plant in the United Arab Emirates faced challenges in their oxidation ditch due to filamentous sludge bulking, resulting in poor sludge settling in the secondary clarifier. The oxidation ditch is treating an average of 2.64 MGD (10,000 m 3 /day) of wastewater, composed of seventy percent municipal and thirty percent industrial waste streams. High organic loads, summer heat a

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