Oak Orchard

Area served: Cicero, Clay, and North Syracuse.

Treatment: Unox pure oxygen activated sludge plant. Pure oxygen aeration generated on-site by pressure swing adsorption. Plant capacity: design = 10 MGD (peak = 24 MGD).

Plant facts

The plant was originally intended to accomplish two-stage nitrification using two existing lagoons (18 MG each) as the second stage. The plant now utilizes single-stage nitrification since the lagoons could not nitrify consistently. In 2001 the aerated grit chambers were covered for odor control. Odors are mitigated using a packed tower scrubber and chemicals listed below. The secondary clarifiers are equipped with mid-tank baffles to prevent short-circuiting.

Typical influent

Pumps associated with phosphorus treatment

Volume = 5.7 MGD, peak = 24 MGD
CBOD₅ = 252 mg/L
TSS = 134 mg/L
TP = 5.5 mg/L
TKN = 29.8 mg/L (from Nov 1, 2001-Oct 31, 2002 lab data). Effluent flow is measured with a Parshall flume.

Specifications

Design values: Volume 10 MGD
BOD₅=14,200 lb/day
TSS=16,700 lb/day

Grit chambers (2)

Clamshell bucket, 45,800 gal/tank, 91,600 gal total

Flocculation tanks

Primary - 4 (2 used)
Secondary - (not used)

Primary clarifiers (2)

120´ long 60´ wide 10.9´ deep, 585,415 gal/tank

Aeration tanks (2)

108´ long 72´ wide 10.3´ deep, 227,661 gal/tank

Chlorine contact tanks (2)

80´ long 20´ wide 10´ deep

Principal chemicals used

Aluminum sulfate added in grit chambers for TP removal. Sodium hypochlorite is used at the plant for disinfection and odor control. Sodium hypochlorite is fed at Davis Road and Gaskin Road pump stations for H₂S control. Sodium hydroxide is used at the plant for odor control. Cationic emulsion polymer used to enhance settling in secondary clarifiers.

Biosolids handling

Biosolids are sent to a gravity thickener and then hauled by tanker to Metro for further processing in anaerobic digesters, dewatered, and treatment in the N-Viro™ process.
Date: 1-09-2003