BILGE-WATER-TREATMENT-SYSTEM-3

BOWTS Bilge Oily Water Treatment Systems

The BOWTS Series, Bilge Oily Wastewater Treatment Systems are designed for removing a wide variety of contaminants typically found in ships bilge. Each BOWTS system can be custom sized, configured and designed around each shore-side treatment facility to fit any flow rate required and water characteristic. From low flow to high flow the BOWTS can be scaled up or down and configured to provide an economic alternative to “one size fits all” design philosophy. The BOWTS systems can be used in harbor bilge shore side collect and treat facilities for pleasure craft as well as naval and commercial vessels.

Overview

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.

Specifications

Specification Summary:
System model
Number of model sizes 
Process  types
Volume range offered     

Design Specification Summary

Tank design    
Solids hopper
Clean water effluent chamber
Cover      
Fittings  
Base  
Chemical metering pumps  
Mixer   
Internal/external piping 
Dewatering filter 
Sludge pumps     
Controls                         

Available Materials of Construction

Tanks 
Piping
Testing
Surface preparation(steel)
           
Coatings (steel)                                         

 

Standards used    

BOWTS
Bilge Oily Water Treatment System
10
Oil separation, TSS flocculation/settling, metals precipitation/settling, emulsion breaking,
5 – 1000 GPM

 

Rectangular, vertical cylindrical, carbon steel, stainless steel, polyethylene, FRP
Hopper, flat bottom (1)
Above cone, also reaction chamber, during settling water phase clears and clear water is removed.
Single access cover, 16” with handles, vented
All fittings are to be FNPT coupling up to 4″. Fittings larger to be 150# FF ANSI B16.5 flange.
Steel or polyethylene elevation stand.
Solenoid motor powered diaphragm design, diaphragm matched to chemicals being pumped
Gear driven, 0-350 RPM, inverter duty variable speed, TEFC motor
Schedule 80 PVC, FRP, SS as dictated by application
Filter press or screw press. Choice depends on water volume, treatment time frames
Air operated diaphragm, aluminum body, Buna diaphragm & check valves
NEMA 4, 115V/1pH or greater voltages as required

 

A-36 carbon steel, 304/316 SS, FRP, polyethylene, polypropylene
A-53 black steel, 304/316 SS, FRP, PVC
Dye penetrant on steel construction
Interior surfaces shall be prepared to an SSPC-SP10 near white metal blast. Exterior surfaces shall be prepared to an SSPC-SP6 commercial blast.
Interior coating shall be coated with Ameron High Build Coal Tar Epoxy Amercoat 78HB (18-20 mils DFT).
Exterior coating shall be coated with Ameron epoxy primer, Amerlock 2, (5-8 mils DFT).  Final coat to be Ameron Amershield Aliphatic Polyurethane Enamel coat (5 mils DFT). Surface color to be Green RT-2203.

AWS D1.1/1.1M, API, API-650, API-421, ANSI, IEC,AWS D1.6, UL, UL-508,UL-845,SSPC,ASME, CSA, NEMA, NFPA79, NEC

Theory

The Bilge Oily Water Treatment Systems (BOWTS) are based on the integration of multiple technologies manufactured by Pan America Environmental. Each technology has its own, operational theory.

What is Bilge Water?
Bilge water is a collection of waste products contained in water that accumulates  in collection sumps, tanks or wells at the bottom of a ship. The bilge is a variable type of waste that can be simple with few contaminants or complex with many contaminants intermixed and in various states or conditions. The complexity of the bilge is highly dependent on the ship type, age, maintenance schedules, materials used on board and other contributors.

The BOWTS systems are designed to treat bilge water which contains:
– Oils
– Fuels and fuel oils
– Lubes
– Emulsified oils
– Air compressor condensate
– Cleaning solvents
– Equipment and engine room wash water
– Suspended solids
– Bio-growth and metals
– Lube greases
– Solvents, generally BTEX products
– Seawater/freshwater cooling water
– Engine coolant
– AFFF fire fighting foam
– Grey water leakage
– Sanitary system leakage
– Water treatment chemicals
– Iron oxide particulates
– Detergents
– Soot

Many of these materials can be present simultaneously in the bilge at any time. Depending on the age of the ship and/or the types of equipment and propulsion system will determine which of these can be present, but these are the most common materials that can be found.

Per current IMO, MEPC, MARPOL and other regulatory requirements the oil water separator systems on board simply cannot handle all of these materials as their design is not meant to. When large volume bilge treatment is required and the flexibility to treat the variety of contaminants is needed a land based solution is required.

Treatment Processes Used
The BOWTS systems can be provided with any of the following processes to create a solution:

  • Gravity settling & separation
  • Coalescing oil separation
  • Coagulation
  • Flocculation
  • pH neutralization
  • Dissolved Air Flotation
  • Effluent filtration
  • Effluent polishing
  • AFFF monitoring
  • Oil content monitoring
  • pH monitoring

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 (LET also is provided with a belt skimmer to remove floating oils). The water then passes through a multi-stage, CRT Series chemical reaction treatment system where chemical treatment is performed to break emulsions, flocculate solids and condition the pH.

Three chemical metering pumps feed a de-emulsifier, sodium hydroxide (NaOH), and anionic polyacrylamide polymer into the reaction chambers to break the emulsion, precipitate the heavy metals, and flocculate the solids. The effluent is then gravity fed into a Dissolved 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 sludge 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.

Models

Models:                  BOWTS Series

BOWTS  models   Flow Rate (GPM)                                 
BOWTS-50             50                           
BOWTS-100           100                         
BOWTS-200           200                         
BOWTS-300           300                         
BOWTS-400           400

Options

Influent Feed System:
Air operated, diaphragm pump with air controls or progressive cavity pump, sump level switches & Nema 4 control panel, base mounted, 115/230/460V power offered. Electric diaphragm pumps available.

Effluent Pumpout:
Centrifugal pump with level switches & Nema 4 control panel, base mounted, 115/230/460V power offered. OS Effluent chamber must be expanded to accommodate pumpout or provision of an external pumpout tank.

Sludge Pumpout System:
Air operated, diaphragm pump with air controls & Nema 4 control panel, auto on/off timer, base mounted,             115V/1ph/60Hz power req’d. Progressive cavity pump system also available. 1 – 100 GPM.

Oil Pumpout System:
Air operated, diaphragm pump with air controls, level switches & Nema 4 control panel, base mounted, 115V/1ph/60Hz power req’d. Electric gear or progressive pump systems available. 1 – 100 GPM (larger if required)

Sludge Auger:
OS separator V-hopper(s) can be provided with a sludge auger. System consists of stainless steel shafts with coated steel screw auger(s) driven by a slow speed gear motor drive assembly. The auger extends the full length of the solids hopper(s) and conveys solids to the sludge outlet.  A Nema 4 on/off control box is provided, power required: 230 or 460V/3ph/60Hz.

Freeze Protection:
Immersion heaters mounted through tank wall. Each heater has an independent thermocouple well, 0-100 deg. F thermostat and Nema 1 (or optional Nema 4) housing. 230/460V/3ph/60Hz power req’d.

Retpak Secondary Coalescer:
High surface area, reticulated, secondary coalescing media for polishing flow after standard Flopak media.

Oil Sight Glass:
Two automatic, brass valves with tempered sight glass and protection rods mounted in oil reservoir. If glass is broken check ball stops outflow from reservoir.

External Sight / Level Glass:
An externally mounted clear PVC sight tube is provided with multi-point level switch for indication or pump control of oil or water. Switch is removable for cleaning and inspection.

Elevation Stand:
Epoxy coated steel stand or legs to elevate tank to desired level. Standard deck height is 30″. Full platforms & walkways with ladders or stairways can be designed where required or desired.

High Temperature Design:
Flopak coalescing media and any piping is constructed of a combination of CPVC &/or polypropylene (or other materials) for temperature resistance up to 200° F.

Alternate Media Construction: 
Standard Flopak media is PVC. HPVC, polypropylene, glass-coupled polypropylene and 304/316 stainless media is available. Contact PAE to determine proper media type for your application. Media plate spacing is available in 1/2″, 3/4″ & 1.2″.

External Storage/Feed Tanks:  
A wide variety of tank volumes can be supplied for your water, product and sludge holding needs. Flat bottom and cone bottom designs constructed in polyethylene, fiberglass, steel & stainless steel can be provided.

Effluent Filter Systems:
Solids filter systems can be provided to remove filterable solids from the separator effluent. Contact Pan America to determine proper filtration needs for your application.

AQAM Filter Systems:
AQAM (Alkyl Quaternary Ammonium Montmorillonite) filter systems can be provided to remove trace hydrocarbons, sheens, DNAPLs, slightly soluble chlorinated hydrocarbons and high molecular weight organics from the separator effluent. Contact Pan America to determine proper filtration needs for your application. Can be used to protect and increase GAC lifespan.

Carbon Filtration Systems:
GAC carbon filters can be provided to remove contaminants after the separator. Contact Pan America to determine proper system needs for your application.

Emulsion Cracking Systems:
Emulsion cracking systems can be provided to remove oil-in-water emulsions prior to the separator. Contact Pan America to determine proper system needs for your application.

pH Adjustment Systems:
pH adjustment systems can be provided to maintain pH levels prior to or after the separator. Contact Pan America to determine proper system needs for your application.

System Containerization:
OS separators with any options can be installed in a 20 or 40’ shipping container(s) to simplify system provision and field implementation. System would include the complete mounting, piping and wiring of the system in one or more container as required by the project.

Trailer Mounting:
OS separators can be mounted on a trailer for system mobilization. Trailer design generally includes corner leveling jacks, bubble levels, walkway, toolbox, electric or hydraulic brakes, piping and wiring of options.

Field Skid Mounting:
OS separator system can be mounted to a mobile skid with leveling for quick field mobilization.

Skid Mounted System:
OS separators can be combined with our other treatment equipment and options into a fully integrated, custom designed system completely mounted, plumbed and wired to a system skid. To simplify your need to do the wiring and plumbing on site, reducing your time frames and on site costs, we design around your requirements.

Vent Scrubber:
Separator vapors can be extracted and scrubbed prior to discharge to atmosphere to remove VOC content.

Level Sensors:
Level sensors can be provided to detect water and oil/fuels. One or more sensor points can be provided to perform various functions such as high level, low level, pump on/off based on liquid levels and level detection for DCS controls or other functions based on your needs.

Class 1 Div 1 & 2:
Systems can be designed for use in a class 1 div 1 or 2 environment. Controls, components and wiring are changed to meet the needs of these environments. Intrinsically safe relays are also used for level sensors.

Oil Monitor:
An oil detection system can be provided to monitor effluent oil content and provide various actions based on the oil alarm setpoint. Actions might include: audible/visual alarm, redirection of influent or effluent via actuated valve, shutdown of influent pump or your custom action.

Seismic Design:
The system can be designed for zone 2, 3 or 4 installations.

Applications

  • Ship bilge water
  • Barge cleaning water
  • Pleasure craft bilge water
  • Harbor wharf bilge collection & treatment
  • Produced water
  • Frac water
  • Flowback water
  • Produced water
  • Refineries
  • Biodiesel plants
  • Pulp & paper mills
  • Aircraft maintenance
  • Ballast water
  • Tank & truck wash

Performance

Oil/fuel &  emulsion removal
Solids (TSS)
Metals
10 mg/L or less of oil droplets 30 micron and larger of emulsified, free and dispersed oils
5 -50 mg/L TSS removal is dependent on settling time used
Dependant on metal type and ultimate chemistry utilized. Also determined by jar testing

Pan America Environmental, Inc
2309 N. Ringwood Rd., Ste G, McHenry, IL 60050 USA
815.344.2960   •   panam@panamenv.com

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