a sustainable solution replacing an active and inefficient
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Joyce Cruz - Project Geologist – joyce.cruz@ch2m.com
João Marcellino – Project Manager – joao.marcellino@ch2m.com
Olivier Maurer – Senior Technologist – olivier.maurer@ch2m.com
Christian Nogueira – Senior Reviewer – christian.nogueira@ch2m.com
Renata Moura – Petrom Contract Manager - renata.moura@petrom.com.br
A sustainable solution replacing an active and inefficient Dual Phase Extraction System
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Schedule
• Introduction
• NAPL distribution model
• Conceptual approach
• Construction
• Conclusions
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A sustainable solution replacing an active and inefficient Dual Phase Extraction System
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Introduction We will present the main steps of a Permeable Adsorp5ve Barrier system at the a chemical facility near São Paulo Brazil (Petrom, Mogi das Cruzes). :
-‐ to design
-‐ construct,
-‐ and operate
• Dual-‐Phase Extrac5on System in opera5on since 2007 to treat LNAPL, not sufficient enough and not sustainable.
• APer revising the Site Conceptual Model (CSM) a Passive Barrier System was viewed as a more sustainable solu5on to prevent poten5al light non-‐aqueous phase liquid (LNAPL) (di(2-‐ethylhexyl)phthalate (DEHP) and di-‐n-‐butyl phthalate (DBP)) from entering a channelized water stream crossing the facility, the main environmental receptor.
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Localization
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New Conceptual Site Model (CSM) • Provided the necessary support for the technical team to propose a
modification on the remedial approach to CETESB, with the replacement of the existing MPE system for a permeable reactive barrier (PAB wall).
Lost on MPE System efficiency
Significant long term expenditures, without knowing the closure plan
Company was looking for a consulting firm with exp. on Sustainable
Remediation
Main receptor of concern, not yet impacted.
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Petrom Study Case • 2013 – first steps, select a more sustainable solution and gain support from authorities
– Review and revision of existing conceptual site model (CSM) and Human Health Risk Assessment,
– Presentation to CETESB of new remedial concept and approval
• 2014 – Barrier Construction
• 2015 – Cetesb presentation
• 2015 – Dual system evaluation
Suggested that the free product plume was relatively stable with low mobility
Narrow Valley
NAPL containing di(2-ethylhexyl)phthalate (DEHP)
and di-n-butyl phthalate (DBP)
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MPE System Loss of Efficiency
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12000
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Acu
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(Lite
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Volu
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Volume of Extract Product
! Product removed from1999 to sept/2006: 54.717L ! Clear lost on efficiency ! Heavy O&M scope, costs and energy consumption
9 Presentation Title
NAPL Distribution Model
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Bis[2-ethylhexyl]phtalate Soil Plume
Figure 1 Bis [2-ethylhexyl] phthalate Soil Plume Petrom Mogi Das Cruzes, Brazil
Barrier Wall
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0,1 % NAPL Saturation Plume
Figure 2a 0.1% LNAPL Saturation Plume Petrom Mogi Das Cruzes, Brazil
Barrier Wall Culverted Stream
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0,5 % NAPL Saturation Plume
Figure 2b 0.5% LNAPL Saturation Plume Petrom Mogi Das Cruzes, Brazil
Barrier Wall
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1,0 % NAPL Saturation Plume
Figure 2c 1.0% LNAPL Saturation Plume Petrom Mogi Das Cruzes, Brazil
Barrier Wall
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2,0 % NAPL Saturation Plume
Figure 2d 2.0% LNAPL Saturation Plume Petrom Mogi Das Cruzes, Brazil
Barrier Wall
15 Presentation Title
Conceptual Approach
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New Remedial System (PAB) • Passive Adsorptive Barrier, using the natural GW flow to protect the
primary receptor as well as collecting the free phase and treating the dissolved phase
Added collection trench associated with 2 sumps and
skimmers
PMs to monitor and control the system performance
17 Presentation Title
Construction
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The Barrier System
• 4 main components: 1. LNAPL interceptor and a recovery trench;
2. Situated immediately upgradient of the PAB;
3. Cement-‐bentonite (CB) slurry wall sec5ons;
4. Sumps to recover and prevent LNAPL from accumula5ng at the upgradient faces of both wall sec5ons.
• Design: – Based on nature and es5mated quan55es of LNAPL
– Three key issues : 1. Preven5ng migra5on of the LNAPL through the PAB wall;
2. Clogging of the PAB wall by LNAPL; and,
3. Preven5ng migra5on of dissolved COCs through the PAB wall.
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Layout
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Cement-bentonite Barrier • Two cement-‐bentonite barriers were built in order to drive groundwater flow to the Drainage Barriers to the Adsorp5ve Permeable Sec5on;
• First barrier: 68 meters in length, depth of 4 meters and average width of 0.70 meters;
• Second barrier: 25 meters long, depth of 4 meters and 0.70 meters width;
• Preven5ng that the supernatant free phase contact the Tributary of Oropó Stream.
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Cement-bentonite Barrier
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Gravel Trench Draining Barrier
• The Draining Barrier was built about 30 meters, average width of 0.80 meters and depth of 2.70 meters;
• Lined with geotex5le (Bidim) and filled with graded gravel (#2);
• Two wells to extract product (with skimmers);
• To focus the groundwater flow (and free phase product), direct it to the collec5on wells.
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Gravel Trench
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Permeable Adsorptive Barrier (PAB) Filtering Barrier or Permeable Adsorp5ve Barrier (PAB)
Excavated with dimensions of 4.6x3.50 meters with depth of 4 meters, forming a filter box, "enveloped" by a permeable geosynthe5c.
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Barriers Section
26 Presentation Title
Conclusions
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Conclusions
• The system has collected more than 10,000 liters of product.
• Less O&M
• Energy consumption
• Carbon footprint,
• Innovation in Brazil
• Favorizing operation by local resources
Thanks
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