Refurbished System for a Former Gas Station in a Small Town
MAE2 was approached by a consultant that needed a system that could provide multiple technologies to remediate a site with significant free product gasoline.
The site had been partially studied by a previous consultant and there was no additional funding for further study.
It was decided that installing a system that had a large flow, pressure, vacuum and treatment capacity would allow for operational flexibility and cover any unexpected process needs. Using a refurbished system reduced the installation costs and allowed the system to be on-site significantly sooner.
The consultant knew from experience that they could rely on MAE2 for quality workmanship and long term product support and be delivered a high quality, dependable refurbished system.
The consultant selected MAE2 to build a vacuum enhanced groundwater pump and treat and air sparge remediation system that incorporated down well groundwater pumps and high vacuum DPE (Dual Phase Extraction) in order to remove the free product and lower the dissolved phase gasoline concentrations. The system also includes Air Sparging in order to volatilize VOC’s in the vadose zone and stimulate bio activity.
MAE2 recommended a high vacuum 30 HP rotary claw pump along with QED pneumatic auto pumps to dewater the wells and to expose more soil the influence of the SVE and the rotary claw compressor used for air sparging. The rotary claw vacuum pump was chosen to allow the system flexibility to operate at a wide range of vacuum levels.
The flexibility allows the system to operate at low vacuum to help slurp the free product in the wells while pumping at a low rate to maximize the initial free product recovery. The pneumatic auto pumps operate on demand with a 15 HP reciprocating air compressor providing the air supply needed for pumping. The Groundwater Treatment system consists of an air water separator, an oil water separator to remove free product and a removable tray air stripper to remove the dissolved phase gasoline before discharging to surface water.
To start free product removal the consultant operated only the pneumatic downwell pumps. Once the free product is reduced in the recovery wells, the well pumps will be set deeper and pump at a higher volume and the vacuum from the SVE will be increased. The rotary claw sparge compressor will also be started to maximize the treatment and reduce the project run time. An enclosed steel frame utility trailer enclosure allows for maximimum flexibility and mobility.
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
Progressive Cavity Transfer Pump
Reciprocating Air Compressor
Down well Pneumatic Pumps
Rotary Claw Compressor