SVE/Air Sparge System – Florida
The contaminants of concern at this site are BTEX. This system consists of an SVE/Air Sparge system with an air stripper for condensate treatment mounted in a modified shipping container. The SVE system utilizes a 125-HP liquid ring pump to meet a performance of 1,910 ACFM at 20” Hg vacuum. The liquid ring pump draws from a nine-leg influent manifold and a vapor liquid separator, and discharges to an air-to-air heat exchanger and two 3,500 lbs vapor phase carbon treatment vessels. The condensate from the air stream is treated using a 25 GPM air stripper before discharging to a 105 G water storage tank. The Air Sparge system is designed to deliver 190 SCFM at 25 PSI through a fifteen-leg distribution manifold. The compressor discharge air is cooled using an air-to-air heat exchanger before reaching the distribution manifold. The system is mounted in an 8’x40’ modified shipping container plumbed and wired to NEC Class 1 Division 2 specifications. A PLC-based control system with wireless telemetry capabilities is used for control and monitoring purposes. The control system is mounted to the enclosure exterior.
SVE System – New York
The contaminants of concern at this site are chlorinated solvents. The system consists of three inlet vapor liquid separators and three 30-HP SVE blowers operating in parallel. The discharge of the blowers are combined into a single discharge line, this discharge is piped through an air-to-air heat exchanger before being treated with a 5,000 lbs vapor phase carbon filtration vessel. The system is controlled by an Allen-Bradley PLC control system with an MLE Equipment wireless telemetry package.
Large Scale SVE System for Landfill – Georgia
This system was designed to treat a range of contaminants including chlorinated solvents at a private decommissioned landfill site. The system consists of a vacuum extraction system and a pump & treat system to remove and treat leachate from the wells. The vacuum extraction system consists of a 25 HP LRP system and two 40 HP rotary lobe blowers. The SVE process air is treated with an oxidizer/scrubber off gas treatment system. The condensate captured by the inlet vapor liquid separators is treated using an air stripper before final discharge. The vacuum extraction system and water treatment system are mounted in a modified shipping container. The scrubber is mounted in the VES/water treatment container but requires a second modified shipping container located above the SVE/water treatment container to house the stack portion of the scrubber, as shown in the picture. A PLC-based control system is used for system control.
SCADA System for BSVE Treatment System – Arizona
The scope of this project was to provide a control/telemetry system to locally and remotely operate a remediation system at a jet engine testing facility. The remediation system consists of a biologically enhanced soil vapor extraction and treatment system. The system includes a VFD controlled SVE vacuum blower, thermal oxidizer/scrubber, cooling tower, vapor phase carbon and a VFD controlled injection blower. A PID loop is used to control the SVE air flow by varying the speed of the VFD. The process air concentration is also controlled with a PID loop, which controls the position of a dilution air valve. Five electric actuated flow control valves on PID loops control the extraction flow from the various site extraction wells. The complete system is controlled by a Honeywell HC900 PLC and Specview32 HMI software running on a local 15” PC/touch screen combination as well as on a remote desktop computer. The HC900 PLC control panel is interconnected with the oxidizer/scrubber control panel as well as with the standalone SquareD VFD control panels and a SquareD motor control center. The HMI software included datalogging for over 50 analog values and automatic report generation on a user defined basis.
SVE/Air Sparge System – Florida
The contaminants of concern at this site are BTEX. This system consists of identical SVE/Air Sparge systems mounted in two enclosed trailers. Each SVE system consists of a fifty-six-leg inlet manifold, a 1,760 ACFM SVE blower operating under 64” WC vacuum, a 480 gallon vapor liquid separator, a bag filtration vessel and a liquid phase carbon filtration vessel for condensate treatment. The inlet manifold is divided into four branches of fourteen legs with each branch mounted in a separate aluminum manifold cabinet located outside of the remediation enclosure. Each Air Sparge system is designed for 525 SCFM at a pressure of 18 PSI. The air sparge process stream is cooled through an air-to-air heat exchanger before being distributed to the ground through a four-branch, two-hundred-eighty-leg manifold. Similar to the SVE system manifold, the air sparge manifold is divided up into sixteen aluminum manifold cabinets located outside of the remediation enclosure. As mentioned previously, the main process equipment for the system is mounted in two 8’x24’ enclosed trailers. Each trailer is divided into two separate rooms, where SVE equipment is located in a room plumbed and wired to NEC Class 1 Division 2 standards, and Air Sparge equipment is located in a room plumbed to NEC General Purpose Standards. A PLC-based control system is used for system operation and is mounted to the enclosure exterior along with a system main disconnect.
In-Line Eductor with Water Treatment – Massachusetts
This system was designed to remediate a contaminated site located in a small town in Massachusetts. The In-Line Eductor technology was chosen because of the location of the plume, which was located below a building. The location made it difficult to use more traditional types of remediation technologies. The MLE Equipment system consisted of five eductors installed in series in a horizontal well. The eductors were spaced at approximately 45 feet from each other in a 2.5 inch HDPE concentric pipe containing a small diameter motive water line. The motive water flow was 12 GPM and the motive water pressure was 175 PSI. The design extraction flow rate was 20 GPM. The effluent from the in-line eductor system was discharged into a settling tank. The recovered water was then pumped to an oil water separator where the free product was separated from the water. In the separation process the water flowed under a weir into an effluent pump out chamber. From the effluent pump out chamber the water was pumped through liquid phase carbon vessels and discharged into the sewer system. The motive water supply was also taken from the effluent pump out chamber of the oil water separator. The control system was PLC-based, the system was set up to be operated and monitored remotely with an MLE Equipment remote control and telemetry package. The equipment was contained in a 20 foot long insulated building that was classified to NEC Class 1 Div 2 standards.
MPE System with Water Treatment for a Manufactured Gas Plant – Illinois
This system was designed to remove coal tar from a Manufactured Gas Plant (MGP) site. The remediation system consists of a multi-phase extraction and treatment system. The system includes eight 100 HP dual stage liquid ring pumps, two combined LNAPL / DNAPL oil water separators rated at 160 GPM each and air treatment using a 2000 CFM gas fired thermal catalytic oxidizer. The control system incorporates the Site Link Web system by MLE Equipment and provides full system control and SCADA via the internet.
Dewatering System for a Nuclear Power Plant – Florida
This system was designed for a dewatering project at a nuclear power plant; the contaminant of concern was TCE. The system consisted of two QED 24.6 air strippers fabricated from marine grade aluminum. The water flow capacity of the system was 250 GPM, however the system had a completely independent backup system. The circumstances of the project required the system to have a 100% run time. The main treatment system and the backup treatment system were mounted on one 32’ long flat deck trailer. The system incorporated the Site Link Web system complete with wireless internet connection. This equipment is now in the MLE Equipment rental fleet and available for rent or purchase.
SCADA System for Water Treatment Plant – New York
The scope of this project was to provide a control/telemetry system to locally and remotely operate existing remediation equipment at an active refueling depot. The control system included one central control panel and 10 remote control panels located at each extraction well. The 10 remote control panels were built to NEC Class 1 Division 1 standards (due to contaminant) and the main control panel was built to NEC General Purpose standards. The objective in the recovery wells is to draw down the water table to a user defined level in order to capture the contaminated water, the contaminated water is then pumped through a treatment process. After the treatment process the clean water is discharged to a nearby river, and the recovered product is reused. The main control system is based on an Allen Bradley ControlLogix PLC with a Versa View touch screen. A ControlNet platform is the communications medium used to connect each of the 10 remote panels which are furnished with Allen Bradley FlexLogic PLC’s. Each remote well has a well pump that is controlled with a variable frequency drive; these drives are controlled by the main ControlLogix processor through a DeviceNet platform. The well pump speeds are maintained in a PID closed loop configuration using well level information from the level transducer feedback signals from each well. The complete system can be operated (monitor and control) locally or remotely from a computer with a modem and a phone line using the appropriate security information.
Large Air Treatment System for Manufactured Gas Plant – Indiana
This system was designed for an air treatment project at a Manufactured Gas Plant site. For this project MLE Equipment used one of its MGP Series Air Treatment Systems from its rental fleet. These systems are designed to hold up to 32,000 lbs of vapor phase carbon filtration media and to handle air flows up to 20,000 cubic feet per minute (CFM). The MLE Equipment MGP Series systems are tailored to treat off-gas at manufactured gas plant (MGP) sites where bioremediation, soil remediation and excavation are being applied. Each MGP Series system consists of inlet particulate filters, a process blower, vapor phase carbon for off-gas treatment, and an automated control system. Each MGP Series system is wired and tested before leaving the MLE Equipment manufacturing facility, allowing a turn-key system to arrive on site.
