Overview March 2019 Presented by: Byron Mazur B.Sc. Manager, - PowerPoint PPT Presentation

Salt lt Im Impacted Soil Treatment – A Project Overview March 2019 Presented by: Byron Mazur B.Sc. Manager, Client Service Western Canada

In Introduction Salt Impacted Soil Treatment – Full Scale Operation – Project Overview • The Process • The site • Objectives • Technologies • Results • The end

The technology - overview The technology was developed over 10 years of R and D efforts. Engineered soil leaching process that target salinity related contaminant (Electrical conductivity [EC], sodium adsorption ratio [SAR], chloride). Englobe has developed proprietary methods and technology for: characterization protocols to assess treatment potential; amendment mixes; irrigation strategies; process monitoring tools. The technology is patented in the USA and patent pending in Canada. " Salt-Impacted Soil Treatment Process and System for Remediating a Salt- Impacted Soil “. WO/2014/059540 3

The Technology - the science Impacted soil is leached with a solution of varying amendment concentration to remove different forms of ions : precipitated dissolved adsorbed Reduction of EC, chloride, SAR and exchangeable sodium percentage (ESP). Process water can be treated with Reverse Osmosis or disposed of. Treatment duration varies based on pile height and soil type, but is designed to treat a batch per treatment season Volume of water and the quantity of amendment are adapted to suit the remediation targets. 4

The Site Large Size Upstream/Midstream Oil Battery/Satelite and Well Produced Water Spills (salt water) ~150,000m 3 Salt Impacted Soil High water table, almost to surface 5

The Objective – Site Specific Soil Treatment Targets Overall Goal, Site Remediation “good” rating category for topsoil for EC (2) and SAR (4); “good” rating category for subsoil (up to 1.5 m in depth) for EC (3) and SAR (4); and, Chloride concentrations of 370 mg/kg for all underlying soil horizons (below 1.5 mbgs) 6

Lab Trials – 2017 40,000 20,000 Chlroide concentrattions (mg/l) 18,000 EC 35,000 Electrical conductivity (uS/cm) Graph Shows Leachate Results 16,000 Chloride 30,000 14,000 25,000 12,000 Initial Soil results 20,000 10,000 8,000 15,000 EC 8.3 6,000 10,000 4,000 SAR 20 5,000 2,000 Chloride 1,400 mg/kg 0 0 0% 20% 40% 60% 80% 100% Final Soil Results Fraction of leaching water collected EC 0.60 (average) 0.54-0.68 (range) SAR 0.72-2.1 (range) Chloride <100mg/kg (94% Chloride Reduction) 7

The Technology and the STF Reverse Osmosis Equipment Fall 2017 Treatment Pad Construction began June 2018 Treatment Equipment Salt Impacted Soil Treatment Unit July 2018 Treatment Commencement August 21,2018 8

Treatment Tarped Pile To Control Environment Both technology’s working together 76 Days 9

The Reverse Osmosis Equipment Used to process impacted water from excavations Deionized, clean water, used to irrigate impacted soil Clean/ Concentrate leachate from STF Concentrate from RO was disposed of at a water disposal system adjacent to the site. 10 10

Pretreatment Results Pretreatment Results EC 3.3 to 9.3 dS/m (average of 4.5 dS/m) SAR ranged from 1.6 to 17.7 Chloride 440 to 2,270 mg/kg (average of 804 mg/kg) 11 11

The Treatment Results EC ranged from 0.4 to 1.9 dS/m (average of 1.0 dS/m) 79% reduction in overall EC value , reduced EC in each Sample Chloride ranged 13 to 287 mg/kg (average of 91 mg/kg) 89% reduction in overall chloride concentration , reduced chloride in each Sample SAR ranged from 2.1 to 16.6 10 of 19 lots had SAR value still above 4, strategic backfilling was the plan to account for this 12 12

The Results – Continued Treatment Volume 2,750 m3 soil, all soil met the targets based on the depth that it was to be backfilled at. >4,500 m3 of water used for treatment <2,000 m3 of water was disposed of throughout the treatment. Chloride Target was surpassed – process will be optimized in future – reduction of water used in the process 13 13

The Wins – Why it worked here Large Site Enough Soil to justify investment of STF to be amortized across Room for construction of STF Implementation of the RO Used “dirty” water from the site to clean soil, water that would have had to be disposed of or managed Concentrated leachate from soil treatment, greatly reduced disposal of water Water Disposal System Adjacent to site Dig and dump option would require huge volumes of soil to be displaced, large cost. There was no landfill Next door. 14 14

The Future of the Project 2019 Season – STF to be utilized to capacity, >5,000 m3 of soil to be treated Possible expansion of the STF in future Years Ongoing development and optimization of process. 15 15

Technology – Additional information PROS The technology can technically be applied to most soil types and levels of contamination; Fully Scalable It provides a sustainable approach for the remediation of salt-impacted sites; Reduces off-site disposal Reduces importation of clean backfill Can salvage impacted top soil Can address mix-contamination (hydrocarbons & salts). CONS Treatment volume is limited by the size of the STF; the duration of the treatment season (>0 o C ambient temperature), one batch per year Technology at early stage of commercial development 16 16

Questions? • and as a reminder, I am not a chemist. 17 17