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SIMULTANEOUS NITRIFICATION-DENITRIFICATION AND CLARIFICATION IN PSEUDOLIQUIFIED ACTIVATED SLUDGE SYSTEM

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This paper describes results from a pilot study of a novel wastewater treatment technology, which incorporates nutrient removal and solids separation in a single step. The pseudoliquified activated sludge process pilot system was tested on grit removal effluent at hydraulic loading rates of 29.4 to 54.7 m3/d, three different SRT: 15, 37, and 57 days, and over a temperature range of 12–28°C. Despite wide fluctuations in the influent characteristics, the system performed reliably and consistently with respect to organics and TSS removals, achieving BOD and TSS reductions of > 96% and about 90% respectively achieving BOD5 and TSS concentrations as low as 3 mg/l. Although the system achieved average effluent ammonia concentrations of 2.7–3.2 mg/l, nitrification efficiency was hampered at low temperatures (<13°C). The system achieved tertiary effluent quality with denitrification efficiencies of 90%, and 91% total nitrogen removal efficiency., at a total HRT of 4.8 hours and an SRT of 12–17 days. With ferric chloride addition, effluent phosphorous concentrations of 0.5–0.8 mg/l were achieved. Furthermore, due to operation at high biomass concentrations, and relatively long biological solids residence times, sludge yields were over 50% below typical values for activated sludge plants.
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Document Type: Research Article

Publication date: 2002-01-01

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