a sustainable solution replacing an active and inefficient

Joyce Cruz - Project Geologist – [email protected]

João Marcellino – Project Manager – [email protected]

Olivier Maurer – Senior Technologist – [email protected]

Christian Nogueira – Senior Reviewer – [email protected]

Renata Moura – Petrom Contract Manager - [email protected]

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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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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Figure 2b 0.5% LNAPL Saturation Plume Petrom Mogi Das Cruzes, Brazil

Barrier Wall

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Figure 2c 1.0% LNAPL Saturation Plume Petrom Mogi Das Cruzes, Brazil

Barrier Wall

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Figure 2d 2.0% LNAPL Saturation Plume Petrom Mogi Das Cruzes, Brazil

Barrier Wall


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


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


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

a sustainable solution replacing an active and inefficient

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