Dual-Phase Extraction System
Interstate Truck Stop Vacuum Enhanced Groundwater Pump and Treat System for Diesel Free Product
MAE2was selected to design and build a remediation system for a large truck stop.
The consultant selected MAE2 to build a vacuum enhanced groundwater pump and treat remediation system that incorporated down well groundwater pumps and high vacuum DPE (Dual Phase Extraction) in order to remove the free product diesel.
MAE2 recommended 3 high vacuum parallel rotary claw pumps capable of 765 ACFM at 15” Hg, along with 7 QED pneumatic auto pumps to remove the free product diesel fuel. The rotary claw vacuum pumps were chosen to allow the system flexibility to operate at a wide range of vacuum levels. The flexibility allows the system to slurp the diesel in the wells to maximize free product recovery. The pneumatic auto pumps operate on demand with a 10 HP reciprocating air compressor providing the air supply needed for pumping. There are custom 6-point air supply and groundwater inlet manifolds for the well pumps.
The Groundwater Treatment system consists of a 15 point custom, marine grade aluminum, inlet manifold a marine grade aluminum, vapor liquid separator, an oil water separator to remove free product, a 270 gallon product tank with high level alarm, 2 bag filters to remove particulates and solids, with valves allowing them to be used in parallel or series, a Poly Stackable Tray Air Stripper to remove dissolved fuel, 2 more bag filters, an Organo Clay media vessel to remove naphthalene, 2 – 500 LB. high pressure steel liquid carbon vessels before discharging to surface water.
A custom modified cargo container was chosen for the project because the size of the components and required space. A cargo container is often exempt from many local building permit requirements
The regulatory agency requires consistent run time for all approved systems. The system provides run time hours, vacuum trends, and water flow totals recorded through the PLC control panel. The cellular connection allows full system control and data through easy-to-use web browser access. The instant alarm notification and remote control allows the consultant to immediately respond to any changing site conditions and maximize system run time.
This Remediation System uses the following components and subsystems:
- Rotary Claw Vacuum Pump
- Removable Tray Air Stripper
- PLC Control panel
- Oil Water Separator
- Vapor Liquid Separator
- Centrifugal Transfer Pump
- Progressive Cavity Transfer Pump
- Reciprocating Air Compressor
- Down well Pneumatic Pumps
- Rotary Claw Compressor
- Liquid Phase Carbon
Vapor Liquid Separators
Regardless of the vacuum blower chosen, a vapor liquid separator should always be installed inline prior to the blower to capture extracted liquid and minimize on liquid carry over to the blower inlet.
Vapor Liquid Separators are sized based on air flow rates and retention time. At a minimum the VLS should include an inlet filter, ambient air dilution valve with control valve, discharge demister element, discharge pump with controls, and instrumentation – vacuum / pressure / temperature gauges.
Click to download MAE2 Vapor Liquid Separator Tanks data sheet
Dual-Phase Extraction Systems
Dual Phase Extraction (also called Multi-Phase Extraction) is the use of high vacuum system to remove both contaminated groundwater and soil vapor.
MAE2 designs high vacuum systems with water and vapor treatment customized to your site needs. Combine Oil or Water Sealed Liquid Ring pumps for high vacuum and high flow, low maintenance rotary claw pumps for medium to high vacuum and high flow, or rotary lobe positive displacement pumps for low and medium vacuum and high flow with your choice of water and vapor treatment equipment.
The high vacuum dual phase extraction process involves the subsurface removal of air, water, and product. The main determining factor behind the selection of the high vacuum blower is the expected operating vacuum level. Rotary Claw blowers and Liquid ring pumps are most suitable for vacuum levels of 20-29 inches mercury (Hg). Each Dual Phase Extraction System is manufactured to meet your design and site requirements.
Oil Water Separators
Corrugated Plate Oil Water Separators (OWS) are used to enhance the separation of petroleum and oils in free phase or dispersed non dissolved droplets from water.
Our lines of OWSs are manufactured to API 421 guidelines and each separator is customer designed to your specific application using a variety of separation media and material of construction.
Standard Systems
Standard systems are constructed from marine grade aluminum or stainless steel with flow rates from 10-1000 GPM. Media options include PVC and Polypropylene style corrugated plate packs. Each separator is designed with universal fittings allowing the operator to remove and reinstall the lid to change the inlet/outlet orientation of the tank. Each OWS includes separation chamber, adjustable skimmer, overflow weir, pump out chamber, V Hopper, hinged gasketed lid, lid springs and standard inlet/outlet and drain fittings.
Custom Systems
Custom separators can be built to your specification using a wide variety of materials and design options. A full 3 CAD drawing will be provided to you for approval prior to construction.
