The BOWTS Series, Bilge and Oily Wastewater Treatment Systems are designed around U.S. Navy NFESC specifications. Each BOWTS system can be custom sized, configured and designed around each shore-side facility to fit any flow rate required and water characteristic. From high flow to low flow the BOWTS can be scaled up or down and configured to provide an economic alternative to “one size fits all” design philosophy. The use of a bilge and oily wastewater treatment system can help facilities meet pretreatment standards for discharges of wastewater to a POTW (40 CFR 403) or meet the effluent limits of an NPDES permit (40 CFR 122). In addition, this treatment process may help facilities meet the requirements of waste reduction under RCRA (40 CFR 262) and Executive Order 13148. It may also help facilities reduce the amount of regulations they must comply with for the management of hazardous waste (i.e., recordkeeping, reporting, inspections, transportation, and accumulation) under RCRA (40 CFR 262. Typical Large Scale System Components · Feed Pump system · OS Series Oil Water Separator (primary, treating bilge offload to LET) · LET (load equalizing tank) · LET Pumpout · OS Series Oil Water Separator (secondary, lower flow) · Chemical Reaction Treatment (CRT-FF) (flash flocculation/pH) · DAF System (Dissolved Air Flotation) · Hydropneumatic Water Feed System · AFFF Monitoring System · LET Sump Pumping System · Screw Press De-watering & sludge conditioning system · Oil Storage Tank · Oil & Sludge Pumpouts · Motor Control Center (MCC) Where further petroleum/metals & solids reductions are desired or required PAE can provide additional post treatment equipment to increase removal efficiencies. BOWTS Background The Naval Facilities Engineering Service Center (NFESC) has developed a shore-side system specification for treating bilge and other oily wastewaters. The Bilge and Oily Wastewater Treatment System (BOWTS) separates oil, grease, and heavy metals found in ship bilge and oily waters. BOWTS has the capability to lower the contaminant levels to less than the permissible limits for discharge into publicly owned treatment works (POTWs). The BOWTS shore-side systems have successfully operated at Naval Shipyard Long Beach, Naval Air Station Alameda, California; Fleet Industrial Support Center Oakland, California; Naval Station Pearl Harbor, Hawaii; Naval Station Guantanamo Bay, Cuba; Naval Station Guam; Naval Station San Diego, California; Submarine Base San Diego, California; Naval Construction Battalion Center, Port Hueneme, California; and the Naval Station Roosevelt Roads, Puerto Rico. BOWTS Treatment Logic A ship’s bilge water is transferred to a high flow OS Series oil water separator that then gravity feeds into a load equalization tank (LET), for removal of bulk free product. After sufficient residence time, the water fraction is selectively removed and fed through a lower flow, OS Series coalescing oil water separator for mechanical removal of free oil. The water then passes through a multi-stage, CRT Series chemical reaction treatment system where chemical treatment is performed to break emulsions, flocculate solids etc. Three chemical metering pumps feed a demulsifier, sodium hydroxide, and anionic polymer into the reaction chambers to break the emulsion, precipitate the heavy metals, and floc the solids. The effluent is then gravity fed into a Dissovled Air Flotation (DAF) system, where all the reacted materials generated by the process are removed via flotation. An oil tank is provided for collecting the free oil separated in the oil water separators and load equalization tank, and a sludge tank is provided for holding the sludges collected in the oil/water separators and the DAF prior to sludge conditioning and then de-watering. The water fraction leaving the system will be of sufficient quality to be discharged directly into the sanitary sewer. Although the pollutants found in ships’ bilges and other oily wastewaters vary from ship to ship, NFESC applied a strategy to categorize and quantify the principal pollutants. The data collected were used in designing the basic BOWTS specification. Additional process units could be added where local discharge requirements indicate the need for more rigorous treatment than is available from the basic system design.