Abstract
This article discusses an effort by the Palm Coast Wastewater Treatment Plant (WWTP) to expand its treatment capacity, and to produce reclaimed water for use within the city as well as meet the following tertiary effluent limits: carbonaceous biochemical oxygen demand, 5 mg/L; total suspended solids (TSS), < 5 mg/L; and, total nitrogen (TN), 10 mg/L. To meet these challenges, the WWTP incorporated an additional process train comprising a Kruger AE‐DENITRO single‐ditch system followed by two new circular clarifiers to treat an additional design flow of 2.275 mgd for biological treatment. The AE‐DENITRO ditch system consists of five 40‐hp brush aerators, two 4.4‐hp submersible mixers, and one effluent weir. The process uses phased isolation ditch technology by alternating between aerobic (nitrification) and anoxic (denitrification) phases to help reduce the effluent TN. Tertiary treatment at the plant is discussed, along with an expansion of the plant's automation instrumentation and control process.
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