Demonstration of Intermitttent On/Off Aeration at a Municipal Wastewater Treatment Plant for Denitrification and Energy Savings

Final Report

J.K. Park - Associated Professor
J.C. Wang - Research Assistant
Department of Civil Environmental Engineering,
University of Wisconsin-Madison

and

G. Novotny
Wastewater Engineer, Wisconsin Department of Natural Resources

Table of Contents

Intermittent On/Off Aeration

Table of Figures

Figure 3.1 Denitrification rate of Ashland activated sludge

Figure 3.2 Effluent quality before and after intermittent aeration

Figure 3.3 Sludge settleability before and after intermittent aeration

Figure 3.4 Nitrate concentration at the end of the anoxic stage (air-off)

Figure 3.5 Effluent nitrate concentration

Figure 3.6 Nitrate concentration for 24 hour cycle

Figure 3.7 Phosphorus concentration for 24 hour cycle

Figure 3.8 Influent total phosphorus concentration

Figure 3.9 Effluent phosphorus concentration

Figure 3.10 The scheme of reactors used in effluent water-level control study

Figure 3.11 The scheme of operational concept in effluent water-level control study

Figure 3.12 The phosphorus and nitrate profile in the reactor during one cycle

Table of Tables

Table 4.1 Cost Analysis

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