Dissolved Air Flotation Design Parameters
Detailed information on the design and sizing of dissolved air flotation separators and separation systems

Oil Water Separator Design & Sizing information

Oil Water Separator Design Parameters
Detailed information on the design and sizing of oil water separators and separation systems

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API Oil Water Separator Dyna Pak
Enhanced Gravity Oil Water Separator

with Sludge Hopper, Drag Skimmer, Sludge Auger and Covers

Engineering Specifications

1. APPLICATION

1.1. Overall Process Description

1.1.1. The oil water separator will be designed to separate oil and immiscible liquids from a ???? stream.

NOTE: The separator can be designed for process water, wastewater or potable water applications

1.1.2. The design of the separator shall satisfy the requirements of API PUBLICATION 421, Feb. 1990 on DESIGN & OPERATION OF OIL/WATER SEPARATORS and Stoke's law. Performance enhancement shall be achieved by the use of DYNA-PAK cross corrugated coalescing media.

1.1.3. The oil, immiscible liquids and suspended solids will collect on the surfaces of the separator's plate packs where they collect, coalesce and slide up the surface of the media where they collect on the surface of the separation chamber. Solids that collect on the media will slide down the surface of the plates and collect in the separator's sludge hopper. The oil that collects on the surface of the separation chamber will automatically overflow into the oil collection trough. Heavy oils and greases as well as floating solids and the developing rag layer will be "skimmed" into the oil trough by the drag skimmer. The accumulated oil and other skimmed products are discharged as needed to "oil storage". The settled sludge (as well as heavy oils and other immiscible liquids) collects in the sludge hopper where it is thickened and conveyed to the discharge port by the sludge auger where it is discharged as needed to "sludge storage and dewatering". The separator effluent gravity flows from the separator to discharge (or further processing as required).

1.2. Separator Future Conversion Capabilities

1.2.1. The separator shall have the ability to be converted to a complete dissolved air flotation system. The future conversion to a DAF shall be achieved via bolt on assemblies. No welding or alteration of the separator are to be required.

1.3. Required System Performance

1.3.1. The effluent shall contain less than 10 mg/l of oil droplets larger than ???? microns.

2. SCOPE

2.1. The Separator

2.1.1. The separator shall be a specially fabricated rectangular channel tank with supporting structure. The separation process shall be fully automatic requiring no moving parts. The separator must be designed to remove oil and immiscible liquids from wastewater meeting the following criteria:

2.1.2. Designed flow rate = ???? gpm

2.1.3. Separator free board = 4" minimum at design flow rate.

2.1.4. Maximum allowable wastewater temperature = ???? degrees F

2.1.5. The flow shall enter the separator submerged, through an influent diffusion chamber. Dispersion across the depth and width of the DYNA-PAK is to be achieved through the use of a non-clog diffuser.

2.1.6. The Separation Chamber shall be fitted with DYNA-PAK cross corrugated coalescing media. Adequate space is to be left before and after the chamber to prevent short circuiting through the pack.

2.1.7. The separation chamber shall be designed and configured to meet all American Petroleum Institutes design criteria and maintain a height to width to length ratio of (.3 to .5) x (1) x (5). This is to ensure proper fluid dynamics throughout the separator and even flow distribution throughout the entire media pack.

2.1.8. The oil trough shall be located at the influent end of the separation chamber and incorporate a sloped oil skimming beach area suitable for the operation of the surface drag skimmer.

2.1.9. The aqueous phase leaving the DYNA-PAK shall pass under the oil retention baffle and up over the adjustable 304 stainless steel effluent weir (which shall maintain the liquid level throughout the separator) into the effluent chamber.

2.2. Coalescing Media Pack specifications

2.2.1. The coalescing media pack shall be fabricated of Dyna Pak cross corrugated coalescing media manufactured by HYDRO-FLO TECHNOLOGIES.

2.2.2. Minimum effective projected surface area = ???? square feet

2.2.3. Hydraulic loading ratio = ???? gpm / sq. ft. settling area

2.2.4. Plate Spacing (depth of corrugation) = ???? minimum (space between plates, not center to center)

2.2.5. Total volume of effective plate pack = ???? cubic feet minimum

2.2.6. Media corrugations shall be set at a minimum of 60 degrees above the horizontal plane. A 60 degrees angle of repose is required for the complete evacuation of the accumulated settled solids.

2.2.7. All pack materials shall be fabricated of NSF (H-1) and FDA Regulation CFR-21, Part 178.3570 food grade materials. The plates are to be manufactured of ????.

NOTE: Media is available in PVC, CPVC, Polypropylene, Carbon Steel and Stainless Steel.

2.2.8. To ensure full utilization of the media pack and to prevent the shearing of oil particles, Velocities through the unit shall be kept below ???? FPM. Flow velocity calculation shall be submitted for media pack channels to and result in a Reynolds number of 500 or less.

2.3. Removable Lids

2.3.1. The entire separator shall be covered with bolt down removable lid sections. The lids are to fabricated of ????

NOTE: Lids can be fabricated out of coated carbon steel, stainless steel, aluminum diamond plate, etc...

2.3.2. Two separator inspection hatches shall be supplies. One is to be positioned over the oil skimming beach and the other over the effluent weir.

2.4. Surface Drag Skimmer

2.4.1. A removable "Ferris wheel" type float skimming system will be provided.

2.4.2. The entire system shall be self supporting with side and end channels, and cross members with lifting lugs that permit removal of the skimmer assembly as a complete unit for easy cleaning and service. The skimmer drive system is provided with a hollow shaft gear reducer that is maintenance free.

2.4.3. Full width 304 stainless steel skimming blades shall be provided.

2.4.4. The skimmer blades are mounted on swivel pins that are fastened to the skimmer chains and maintain the blades in a down position at all times.

2.4.5. The conveyer chains are provided with drive sprockets on a full width shaft at the drive end and four independent idler sprockets at the return end. The skimmer system frame shall provide a sprocket tension adjustment device and the carrying and return tracks for the chain.

2.4.6. The skimmer system can be made vapor tight by simply caulking the frame to the separator and the provided covers.

2.5. Integral "Mechanical Thickener" Sludge Hopper Design Criteria

2.5.1. The sludge collection chamber shall be located directly beneath the coalescing media pack and provide ample storage capacity for the settled sludge. The sides of the chamber shall be sloped at 45 degrees to insure easy and complete removal of the settled sludge.

2.5.2. The sludge hopper shall have a volume of at least ???? gallons.

2.5.3. The sludge hopper shall have three (3) sludge sample (3/4" NPT 304 SS half couplings) ports.

2.5.4. Two (2) zinc anodes mounted to 3/4" male pipe plugs shall be mounted in the hopper for galvanic protection.

2.6. Sludge Auger / Thickener

2.6.1. The auger / thickener to be of the paddle variety.

2.6.2. The auger / thickener drive is to be of the shaft mount variety.

2.6.3. The auger / thickener should rotate at a max of 3 RPM.

2.6.4. The auger / thickener fabrication, shafts, hardware to be 304 stainless steel

2.6.5. The auger / thickener bearings to be UHMW plastic.

2.6.6. The auger / thickener shaft seal to be of the packing gland variety.

2.7. The Separator Control Panel

2.7.1. The system control panel shall include all necessary components to automatically operate the system meeting the following criteria:

2.7.2. Available Power = ???? V, ???? Hz, ???? phase

2.7.3. NEMA Rating: NEMA 4, suitable for outdoor installations

2.8. Platform (optional)

2.8.1. A platform shall be included for the visual inspection of the separator plate packs, influent and effluent compartments.

2.8.2. Platform floor grating shall be coated for corrosion resistance.

2.8.3. Access to the platform shall be provided by ladder.

2.8.4. A cage shall be included if the ladder height exceeds the allowable distance as specified by OSHA and UBC standards.

2.8.5. The platform and ladder shall come equipped with all the cages, handrails, toe plates and all associated hardware as per OSHA and UBC. All aspects of the platform, ladders, etc. shall be in compliance with all OSHA and UBC standards.

3. GENERAL SPECIFICATIONS

Follow this link to the "Common Engineering Specifications" document that covers all of the common specifications that relate to all Hydro-Flo technologies manufactured equipment.