vapor liquid separator tank
Rental System for a Truck Stop Environmental Remediation Project
MAE2 installed a rental Dual Phase Extraction and Groundwater Treatment system to deal with a storage tank leak.
MAE2 recently started up a rental system at an active Interstate Truck Stop facility that had experienced an underground storage tank leak in the past. The consultant had performed a pilot study at the site and developed the required system performance needed to clean the site. Costs for purchasing a new custom built system were compared to buying a refurbished system and to rental of the refurbished system. The flexibility of renting an existing system that fit the site needs was determined to be the best option.
Truck Stop Environmental Remediation Project
MAE2 took an existing system from our fleet and made minor modifications. A traditional Oil Water Separator and Air stripper was replaced with an Oil Water Separator/Air Stripper Combo unit. The system components were completely tested to make the system site ready.
The system is a Dual Phase Extraction and Groundwater Treatment system designed for 10 GPM water flow and 500 ACFM vapor flow at 22” HG. There is a 5-point extraction manifold that pulls both water and vapor from the extraction wells using two 10 HP rotary claw vacuum pumps in parallel.
Rental Environmental System for a Truck Stop
The extracted groundwater is collected in the 120 G Vapor/Liquid separator and then pumped to an Oil Water Separator/Air Stripper combo unit using a progressive cavity transfer pump. Any free fuel that is extracted is collected in the OWS and gravity drains into a product holding tank. The water gravity flows into the Air Stripper chamber. The combo unit saves the need for an additional transfer pump and takes up less floor space. The water is then pumped through a bag filters in parallel and two high pressure fiberglass carbon vessels for final treatment before discharge. The OWS/Air Stripper pump is a centrifugal transfer pump. The system is controlled by a custom PLC control panel that allows for remote access and control using web-based telemetry.
This Environmental Remediation System uses the following components and subsystems
City Convenience Store Environmental Remediation Site
MAE2 was selected to design and build a remediation system for a convenience store site in mixed use city location.
The consultant conducted a multiple day test at the site. The pilot study indicated a need for a high vacuum system that could treat extracted groundwater at 10-15 GPM and to remove large amounts of free product gasoline. MAE2 used this data to design a system that would extract and treat groundwater and free product from 6 wells located on site. The water needed to be treated to meet the discharge limits for water quality and suspended solids required by the local POTW.
MAE2 used the pilot test data to design and provide written specifications for a Multi Phase Extraction and Groundwater Treatment system. The system needed to remove and treat TPH-Gasoline concentrations as high as 230,000 PPB and MTBE concentrations of 4,600 PPB along with free product gasoline.
The system uses 3 high vacuum rotary claw pumps, providing over 700 ACFM flow at 18” HG vacuum, to extract impacted groundwater and vapors. The client prefers to use multiple pumps operating in parallel rather than a single large pump. This design provides more flexibility to save energy as site needs change over time, along with redundancy to reduce downtime. The system uses a 6 point custom inlet manifold and a marine grade aluminum 120 gallon Air Water Separator.
A progressive cavity transfer pump is used to pump the water to a 20 GPM Oil Water Separator to remove any free product gasoline. Progressive Cavity pumps are selected because they do not create the chemical emulsification of the gasoline and water that other pumps cause. After the Oil Water Separator removes the free product a centrifugal transfer pump sends the water through a bag filter to remove solids and particles from the water before being treated by an oversized Poly Stackable Tray Air Stripper.
The stripper is oversized to provide additional residence time to treat the MTBE. Finally the water is pumped through another bag filter and then two 250 LB Liquid carbon vessels before being discharged to the POTW.
The custom integrated PLC control panel provides runtime hours, vacuum trends, temperature, carbon vessel pressure and water flow totals. The system uses a cellular data connection allowing full system control and data access through easy to use web browser access. The data allows easy access to system operational status and the data needed for writing reports as required by the regulators.
This Environmental Remediation System uses the following components and subsystems
Vapor Liquid Separator Tanks
Vapor Liquid Separator (VLS) or Knockout Tanks are used to remove liquids from airstreams in Soil Vapor Extraction and Dual Phase Extraction systems.
MAE2’s VLS tanks are custom designed based on air flow requirements and come in a range of sizes. The tanks can be constructed from marine grade aluminum or stainless steel. Each tank is custom built to your specification and can have inlets, site tubes, pump out and drains arranged in any orientation you choose. A full 3 CAD drawing will be provided to you for approval prior to construction.
Typical options include 2” clear site tube assembly, Single Point High level switch or multi point pump out switch, vacuum relief valve, vacuum gauges, sample ports, sturdy steel reinforced clean out plug and drain valves.
Options
- Skid Mounted, Custom Water Tight Secondary Containment Enclosures
- Secondary Demister Elements
- MPT, FMPT and Flanged Inlet/Outlet Fittings
- Custom Inlet Filters
- Pump Out Packages
