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Supporting Information
Sustainability: A New Imperative in Contaminated Land Remediation
Deyi Hou 1*, Abir Al-Tabbaa 1 1 Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK* Correspondence to: Email: [email protected]; +44(0)7774-955-082
Additional Information on Sustainable Remediation Practices
The sustainable remediation initiatives taken by governments and the industry in Europe
have led to observable changes in the field. Among others, the sustainable land
management movement in the Europe have encouraged technological innovation. In the
Netherland, remediation practitioners have for the first time combined groundwater energy
(i.e. heat cold storage) with contaminated groundwater cleanup (1). In the UK, practitioners
employed innovative power system to allow for the simultaneous recovery and usage of site
contaminants - coal tar. It was demonstrated that such a system could save project cost by
20~30% and leads to substantial GHG reduction (2). In some other cases it was proposed to
use brownfields to produce biomass, which can be used as feedstock for biofuels (3), and it
was suggested that traditional agricultural practice such as annual liming and application of
animal manure may have mitigated soil-plant transfer of heavy metals, raising a potential for
sustainable management of such contaminated site (4). Moreover, many new initiatives are
implemented to promote sustainable remediation, e.g. a new European project, Holistic
Management of Brownfield Regeneration (HOMBRE), examine life cycle land use and
promote intermediary land use; and another new project, Advancing Sustainable In Situ
Remediation for Contaminated Land and Groundwater (ADVOCATE), is promoting in-situ
remediation technologies.
The green remediation movement in the US has largely focuses on reducing remediation
actions’ environmental footprint (5). The USEPA’s definition of green remediation solely
refers to environmental effects and benefits, without referring to social and economic
aspects (6). This is likely due to the concern that specific inclusion of certain economic and
social considerations may exceed the authority of current USEPA regulatory programs (5).
USEPA’s core elements in green remediation includes: air, water, energy, land &
ecosystems, and materials and waste. Among others, green remediation practices in the US
have focused on energy efficient equipment and sustainable energy systems such as solar
panel, landfill gas converted power system, windmill, and geothermal system; low energy
intensive bioremediation systems, such as enhanced in-situ bioremediation,
phytoremediation, and engineered wetlands; and sustainable construction techniques, such
as recycling of demolition waste, capture and reuse of rainwater, and low maintenance
landscape.
A Meta-Analysis of Studies on Secondary Impact of Remediation
In traditional remediation decision making processes, many of these impacts are externalized. To account for the secondary adverse effects of remediation operation, a life cycle approach has to be used (7). Many studies have attempted to compare the life cycle impact of various remediation technologies (8, 9). However, such studies have rendered a wide variety of results. As shown on Figure S1, the remediation impact factor varies significantly among different remediation technologies. For instance, incineration impact factor was nearly four orders of magnitude higher than that of capping. Even with the same remediation technology, the impact factor can vary significantly from site to site. For instance, the impact factor of ex-situ bioremediation varies by three orders of magnitude and the impact factor of pump and treat varies by two orders of magnitude in different studies. The variety may be due to variation in contaminants type, level, and distribution, as well as many other site-specific hydrogeological conditions. This lack of consistency demands site-specific sustainability evaluation, including remediation life cycle assessment, to select the most sustainable remediation alternative. But more generic remediation life cycle assessment studies can shed light on this issue and potentially provide a more economic tool for remediation practitioners.
Figure S1 Global warming potential of soil and groundwater remediation technologies (CAP=capping; D&H=dig & haul; ESB= Ex-situ Bioremediation; INC=Incineration; ISB= In-
situ Bioremediation; ISCO=in-situ chemical oxidation; ISS=in-situ solidification/stabilisation; ISTD=in-situ thermal desorption; MNA=monitored natural attenuation; PRB=permeable reactive barrier; P&T=pump & treat; SW=Soil Washing)
Study Site Location Contaminants Soil Remediation Technologies
Groundwater Remediation Technologies(1)
Inclusion/Exclusion Criteria and Notes
Busset, 2012 (10)
France PCB ESB; INC N/A Used in Figure 1.c and 1.d
Mak, 2011 (11) US Cr and As N/A PRB Used in Figure 1.c and 1.dLemming, 2010 (12)
Copenhagen, Denmark
TCE N/A ISB; ISTD; D&H
Used in Figure 1.c and 1.d
Fiorenza, 2009 (13)
New Jersey, US Petroleum Hydrocarbon
N/A P&T, MNA, ISCO
Contaminated aquifer volume unknown; only used in Figure 1.d
Harbottle, 2008 (14)
Four sites in England, UK
Petroleum Hydrocarbon, Heavy Metals, Cyanide
ISS; SW; ESB; CAP; D&H
N/A Used in Figure 1.a and 1.b
Payet, 2008 (15) Ronde Venen, Netherlands
Heavy Metals D&H; Phytoremediation
N/A Contaminant mass quantity not available; only used in Figure 1.a; phytoremediation has negative CO2 emission, not shown on figure due to log scale plot.
Garon, 2008 (16) New Jersey, US Misc D&H; ISS; ISB N/A Contaminant mass quantity not available; only used in Figure 1.a
Harbottle, 2007 (17)
England, UK Petroleum Hycrocarbon and BTEX
D&H; ISS N/A Used in Figure 1.a and 1.b; for 1.b, it is assumed that average contaminant concentration was 20% of maximum concentration.
Cadotte, 2007 (18)
Quebec, Canada
Petroleum Hydrocarbon
MNA; ISB; ESB N/A Used in Figure 1.a and 1.b
Bayer, 2006 (19) Karlscruhe, Germany
Acenaphthene P&T; PRB Used in Figure 1.c and 1.d
Toffoletto, 2005 (20)
Quebec, Canada
Petroleum Hydrocarbon
ESB N/A Only one treatment technology; used in Figure 1.a and 1.b
Note: (1) For the purpose of this study, the treatment of saturated soil is considered a groundwater remediation technology. (2) CAP=capping; D&H=dig & haul; ESB= Ex-situ Bioremediation; INC=Incineration; ISB= In-situ Bioremediation; ISCO=in-situ chemical
oxidation; ISS=in-situ solidification/stabilisation; ISTD=in-situ thermal desorption; MNA=monitored natural attenuation; PRB=permeable reactive barrier; P&T=pump & treat; SW=Soil Washing.
Table S1 Reviewed Studies and Inclusion/Exclusion Criteria for Secondary Adverse Effect Shown on Figure 1
Pressures from Other Major Working Parties
The other major working parties at a site may include the primary contractor and key
technology vendors. Remediation contractor is a key actor in remediation practices. While
they have little influence in decision making regarding remediation design, they are a
determining force in remediation operations. There are great opportunities for contractors to
adopt sustainability practices in their operation; and the can also exert influence in decision
making associated with these operation practices.
Specialized technology vendors are not easy to replace; therefore they are capable of
directly influencing decision making in remediation processes. In addition, in remediation
technology selection decision-making process, stakeholders still tend not to trust innovative
technologies (21). This places a barrier in technology diffusion. The incorporation of
sustainable remediation principles can encourage innovative technology development and
deployment. There is a growing trend of tagging “sustainability” with innovative remediation
technologies (22). Some examples discussed in the previous section demonstrated how the
“sustainable remediation” movement has helped in conquest regulatory barrier and creating
innovative solutions. This new institutional context provides challenges as well as
opportunities to technology developers.
Pressures from Secondary Stakeholders
The secondary stakeholders are those who don’t directly make decisions in the remediation
processes or are minor working parties that can be easily replaced. For the stakeholders
without resource interdependence with focal firms (e.g. site neighbours, local communities,
and environmental interest groups), according to stakeholder theories, they tend to use
indirect strategies to influence focal firms through those stakeholders who holds critical
resources (e.g. regulators) and those who have resource interdependence with focal firms
(e.g. major working parties). Studies have found that community and environmental interest
groups can exert pressures on focal firms and effectively change organizational behaviour
(23). In remediation, such pressures have forced contaminated land owners to initiate clean-
up actions especially in many high-profile cases. Community acceptance is also one of nine
balance factors under CERLCA for selecting appropriate remedies (24). Nevertheless, there
is a lack of study on how pressures from communities and environmental interest groups
may have affected the adoption of sustainability principles in contaminated land remediation.
For the stakeholders that are resource dependent on the focal firms, but hold no critical
resources of the focal firms, they would have little influence on decision making according to
traditional stakeholder theories. However, we hypothesize that due to the complexity of
remediation decision making processes, some secondary stakeholders can influence how
remediation is conducted through their own niche institutional fields. For instance, a waste
management contractor may seemingly hold no critical resources of the focal firms as they
can usually be replaced easily; however, their expertise in waste management and familiarity
with regulations put them in a unique position to affect decision making regarding how the
waste is contained, transported, and disposed.
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(2) McLaren, S.; Worboys, M.; Speake, O.; Mantell, P. Ex-situ Thermally Enhanced Coal Tar Recovery - A Low Carbon Option. In Green Remediation Conference; Copenhagen, Denmark, 2009.
(3) SNOWMAN The Rejuvenate Decision-Making Approach-A Worked Example-Crop Based Systems for Sustainable Risk Based Land Management for Economically Marginal Degraded Land; Sustainable Management of Soil and Groundwater (SNOWMAN), 2009.
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(6) USEPA Green Remediation: Incorporating Sustainable Environmental Practices into Remediation of Contaminated Sites. EPA 542-R-08-002.; United States Environmental Protection Agency: Washington, DC, 2008.
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