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MPE, SVE & air SPARGing

 Servicing industry needs for MPE, SVE and air sparging.

MOBILE SYSTEM - MULTI PHASE EXTRACTION

 

InSite's dedicated dangerous goods rated vacuum units, which can hold up to 10,000 litres, are used to undertake short duration multi phase extraction (MPE) works.  We maintain all of our hoses, fittings, spears, monitoring equipment, and safety equipment, and can readily set up on operating sites to avoid client downtime.

 

The system extracts phase separated hydrocarbons (PSH), contaminated groundwater, and volatile contaminants.  InSite monitors groundwater recovery rates, airflow, hexane, head and well vacuum pressures. Project reports are submitted to the client at the conclusion of works, which include raw data, summarised results, extraction trends and waste-tracking documentation.

 

InSite’s mobile MPE system also provides the opportunity to operate pilot trials to assess the long term viability of a more permanent system design.

 

InSite services regional areas via scheduled runs to increase efficiency and reduce mobilisation costs for clients.


InSite has performed thousands of hours of mobile MPE events at service stations, fuel storage facilities, and industrial sites across Australia.

 

CONTAINERISED SYSTEM - MULTI PHASE EXTRACTION

 

Due to high customer demand for efficient, high-quality, and cost effective remediation, InSite has designed and built a containerised MPE unit. The system is ideal for those sites where the remediation strategy calls for long term treatment of hydrocarbon impacted groundwater and soil.

 

Housed in a 6 m long shipping container, the unit can be easily transported and set up anywhere in Australia for weeks, months or years.  It enables rapid system response for environmental incidents, it is easily connected to mains power or a generator, and can be operated and monitored remotely.  The MPE system's features include:

  • 800 m3/hr blower on variable speed drive,
  • On-board activated carbon regeneration system for vapour treatment,
  • On-board air flow and vapour concentration monitoring,
  • Discharge pump for liquid storage or treatment,
  • PLC control system for automated operation,
  • SMS fault notification,
  • Secondary transfer pump for on-site water treatment as required,
  • Hazardous area classification (HAC),
  • Internal soundproofing,
  • Can be easily connected with a water treatment system and liquid storage tanks for later disposal.

Offering a complete 24/7 remediation service for the extraction of PSH, contaminated groundwater and volatile contaminants, the system can extract simultaneously from multiple wells, whilst treating off-gas and liquids prior to discharge.

CASE STUDY: 24/7 MPE targeting on and off site impacts 

 

InSite mobilised a containerised MPE system to a retail fuel outlet in the Hunter region of NSW.  A nine day, round the clock MPE event was undertaken to remove recoverable light non-aqueous phase liquid (LNAPL), dissolved phase hydrocarbons in the groundwater, and volatile organic compounds (VOCs).

 

In addition to using the existing source site extraction wells, temporary fixed piping was installed in a neighbouring commercial property (proposed for redevelopment) to enable immediate and future soil vapour extraction.

 

Due to the proximity of the site to neighbouring properties, night time noise associated with the power generator needed to be suitably managed. InSite undertook noise monitoring and installed sound screens to minimise the impact on nearby noise sensitive receptors.

 

Approximately 39,000 litres of hydrocarbon contaminated water was removed from the site, in addition to a total hydrocarbon mass of approximately 1,400 kg which was extracted primarily as vapour.

CASE STUDY: MPE container targets condensate in north-west WA

 

InSite was engaged to undertake a 25-day MPE event at a process facility located in north-west WA. The objective of the works was to assess the viability of MPE technology at this location to extract LNAPL, contaminated groundwater, and VOC vapours from the subsurface. Insite’s containerised MPE unit with a pre-treatment coalescing plate separator was used to treat extracted groundwater prior to being discharged to the site trade waste management system.

 

Single well, pulsed single-well, and multi-well extraction strategies were trialled to find the optimum extraction configuration.

 

During the trial it was apparent that gases other than those typically associated with the removal of petroleum hydrocarbons from the subsurface were present. Additional instrumentation was mobilised to confirm the presence of high levels of methane and hydrogen sulphide. 

AIR SPARGING AND SOIL VAPOUR EXTRACTION

 

Air sparging is another in situ remediation technique offered by InSite. The process involves pumping air into the ground through wells. It's a technique applied to the treatment of saturated soils and groundwater contaminated by VOCs.

 

When combined with mobile or fixed SVE systems and off-gas treatment, this technique is highly effective in the mobilisation and removal of volatiles from a site.

CASE STUDY: Air Sparge & SVE system install 

 

 

InSite was engaged to design and install a containerised air sparge / SVE system at a suburban Sydney retail fuel outlet to extract volatile contaminants from the sub-surface at the site.   

 

InSite installed pits and pipework before connecting, commissioning, and optimising the system. The fixed system includes off-gas treatment with the vapour treated through granular activated carbon prior to discharge to the atmosphere. InSite installed an SMS fault alert system to provide 24/7 remote monitoring.  

 

InSite maintains operational and maintenance responsibility for the remediation equipment; ensuring efficiency of the sparge, extraction, and vapour treatment components of the system.

 

CASE STUDY: Soil Vapour Extraction / Air Sparge Trial

 

An air sparge / SVE trial undertaken by InSite has assisted in the development of a long term remediation strategy for an operational service station in the southern suburbs of Perth, Western Australia.

 

The InSite team worked closely with the client to develop the trial methodology which assessed the potential effectiveness of a fixed air sparge / SVE system for the site. 

 

InSite mobilised a mobile vacuum unit, compressor, well heads, hoses and a suite of monitoring equipment to undertake and assess the effectiveness of this remediation technique.

 

Applying various combinations of positive and negative air pressure, InSite recorded the impact of each scenario on vapour mass removal, pneumatic and hydraulic radii of influence. 

 

The trial project data was compiled into a factual report for further analysis and assessment by the property owner’s environmental consultant.  

 

CASE STUDY: SVE in Moonie

 

InSite was engaged to undertake an SVE event at a remote location near Moonie, QLD.

 

Works included the installation of six, large-annulus SVE wells (bore diameter of 1000 mm) and pipework connecting the wells to a skid-mounted SVE unit. Due to the remote location of the site, the system was powered by a generator with diesel storage tank.

 

InSite operated the system 24/7 for approximately three months, removing VOCs from the vadose zone. 

 

Air flowrate, vacuum, and total flammable gas concentration data was collected from the main trunk line connecting the SVE wells to the skid-mounted SVE unit. These measurements were used to calculate the total hydrocarbon mass removal, and hourly hydrocarbon recovery rate during the SVE event.

 

A total of 4,425 kg of hydrocarbon was estimated to have been recovered during the three-month event. This equates to a recovery rate of approximately 2.36 kg/hour.