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

3

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

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The Technology - the science

Impacted soil is leached with a solution of varying amendment concentration to remove different forms

• f 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.

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The Site

Large Size Upstream/Midstream Oil

Battery/Satelite and Well

Produced Water Spills (salt water) ~150,000m3 Salt Impacted Soil High water table, almost to surface

6

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)

2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 0% 20% 40% 60% 80% 100% Chlroide concentrattions (mg/l) Electrical conductivity (uS/cm) Fraction of leaching water collected EC Chloride

7

Lab Trials – 2017

Graph Shows Leachate Results Initial Soil results

EC 8.3 SAR 20 Chloride 1,400 mg/kg

Final Soil Results

EC 0.60 (average) 0.54-0.68 (range) SAR 0.72-2.1 (range) Chloride <100mg/kg (94% Chloride Reduction)

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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

9

Treatment

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

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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.

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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)

12 12

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

13 13

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

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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.

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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.

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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 (>0oC ambient temperature), one batch per year

Technology at early stage of commercial development

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Questions?

• and as a reminder, I am not a chemist.