Background Appledore Island, ME: Aerial View.

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Presentation transcript:

Background Appledore Island, ME: Aerial View

Wastewater flow Generated by toilets, showers and sinks Varies daily and seasonally Regimented daily schedule Seasonal operation of the island Average flow is 2000 gallons per day (range 1150 – 3450 gals/day)

SML Wastewater Flow Characteristics SML Wastewater Flow vs. Time (days)

Process Flow Primary Settling Chlorination Dechlorination

Primary Settling Three 1,000 gallon fiberglass tanks in series Total Suspended Solids (TSS) removed by settling Second tank has filter Retains additional solids Retention time 24-41 hours Caused by flow variation Solids accumulate in tank bottom Removed at end of season by vacuum pump

WWTF Schematic 1000 Gallon Settling Tanks

Chlorination Two 500 gallon batch disinfection tanks Operated in parallel 12.5% sodium hypochlorite (NaOCl) used as disinfectant Dosed at 20mg/L Added to wastewater prior to entering batch tanks Design contact time = 30 min Time wastewater in batch tanks Reduced contact time during daily peak flows

WWTF Schematic 1000 Gallon Settling Tanks

Dechlorination Sodium metabisulfite (Na2S2O5) Added immediately upon exiting the disinfection batch tanks Effluent pumped to outfall pipe

WWTF Schematic 1000 Gallon Settling Tanks