Adventus Group / WSP Remediation Ltd.

EHC site submitted for remediation technology innovation award


Source: Adventus Group / WSP Remediation Ltd.

The Adventus Group, a global environmental biotechnology enterprise, was pleased to have EHC included in an application for the 2008 Brownfield Briefing Remediation Innovation Awards, in the category of 'Best Use of a Combination of Remediation Techniques', during the Contaminated Land & Brownfield Remediation' Conference, held recently in London. Project details outlined below.


2008 sees the completion of the Meteor Park Development located to the north of Birmingham. The site was purchased by SEGRO Plc, formerly Slough Estates, and was designated for demolition and redevelopment into four large warehouse facilities ranging in size between 2,066 - 10,690m2. The site was identified by SEGRO as prime for development being in close proximity to Birmingham city centre and major transport routes. However, prior to WSP Remediation's involvement, development was becoming marginal through spiraling remediation costs associated with significant site contamination. In delivering this project, WSP Remediation has adopted a combination of sustainable on-site treatment technologies integrated within a challenging construction programme to address a complex mixture of site contamination across a variety of media unlocking this heavily polluted site.


Located on the former Delta Metals engineering facility, this 4.4 hectare site was heavily contaminated through over 60 years of heavy industry associated with the machining and manufacture of vehicle components for the car industry. The site is located within the shadow of Spaghetti Junction, an area of former heavy industry, located above a major aquifer (Sherwood Sandstone) and adjacent to the River Tame. Whilst historically impaired, these water resources formed the most sensitive environmental receptors in the area together with future site occupants of the proposed industrial facilities (commercial use). The site was underlain by mainly granular made ground, overlying organic alluvial clays, river terrace sands and gravels followed by the sandstone aquifer. Independent water bodies were found in the made ground, the terrace gravels and the sandstone aquifer.

Various site investigations; undertaken prior to WSP Remediation's involvement, identified the following contamination:

* Diesel and lubrication oil hydrocarbons and chlorinated solvent contamination with made ground and alluvial soils;
* Localised hydrocarbon free product present as Light Non-Aqueous Phase Liquid (LNAPL) within perched water and sands and gravel aquifer associated with former below ground structures;
* Widespread dissolved phase chlorinated solvent contamination within the underlying sands and gravel aquifer.


The mix and spread of contamination throughout the soil and groundwater profile meant that a combination of remediation techniques would be required. The methodologies adopted comprised best practice, using sustainable on-site treatment technologies within a compressed remediation programme and supported by remediation design trials, risk assessment and validation protocols. The remediation works were initiated by completion of an extensive supplementary Site Investigation followed by a site specific Quantitative Risk Assessment (QRA). The supplementary investigation works enabled further delineation of the contaminant source zones and the QRA was based upon a CONSIM model using a high percentage of site data to minimise the requirement for generic assumptions and give confidence to all parties that the risks had been adequately characterised. Remediation trials were carried out to fine-tune the remediation design, optimise the remediation techniques applied and recover site specific data for the risk assessment model:

Soil treatment trial - Ex-situ bioremediation was chosen as a well established and successful method for treating organic contamination. Programming constraints meant that the soils remediation works would largely be undertaken during the winter and so aerated biopiles were selected to reduce sensitivity of the treatment works to adverse weather conditions. The feasibility trials included soil sampling and laboratory analysis to examine soil condition in relation to contaminant speciation, nutrient content to identify the key bioremediation drivers, bacterial plate counts to assess natural bacterial activity and physical screening to assess treatability. Groundwater treatment trial - Prior to WSP Remediation's involvement, the preferred remediation method for dealing with the groundwater contamination had been containment incorporating, treatment via some form of Permeable Reactive Barrier (PRB) and a funnel and gate system. Discussions with the EA identified potential concerns associated with this strategy given the extent of the contamination (too significant), the absence of a demonstrable aquitard for any wall to 'key' into and the long term efficacy of a containment strategy given the potential for vertical migration of the solvent contamination into the underlying aquifer. Step and continuous rate pump tests were undertaken to gain a greater understanding of the aquifer flow characteristics. Trial injections of a saline solution were carried out to determine zones of influence, followed by the injection of a reducing substrate, to check that enhanced reductive conditions could be established, to accelerate reductive dechlorination. The product chosen was Adventus EHC™, a formulation of Carbon and Zero Valent Iron with added nutrients; designed to provide support for and to accelerate the action of the indigenous bacteria within the groundwater and saturated zone. This technology represents the pinnacle of current reductive groundwater bioremediation.


WSP Remediation strives to offer sustainable remediation solutions to our clients. We are strong advocates of the emerging Green Remediation approach. Green remediation focuses on the remediation technologies employed, the objectives of the remediation scheme, and the impact of the remediation works against the environmental improvement achieved by the works. What defines 'Green Remediation' versus 'sustainability' is a reduced emphasis on seeking to quantify wider intangible social benefits, though some will logically accrue, for example, by better carbon management. We believe the Meteor Park site is an exemplar green remediation project for the following reasons:

Action : Solvent Treatment
Technique : Direct Injection of EHC (Reductive Dechlorination)
Green Remediation Credentials :

* In-situ destruction of pollutant mass.
* Limited energy consumption other than drilling equipment, delivery of product and site attendances.

Adventus Group - 21st Century Environmental Biotechnologies

Adventus Group provides a growing portfolio of leading environmental remediation technologies, including patented offerings from Adventus Americas Inc., and EnviroMetal Technologies Inc. Our business model supports site owners, environmental engineers, and diverse consulting professionals by providing unbiased design, and selection of the most cost-effective remediation strategies.

Adventus exclusively offers DARAMEND, EHC and related ZVI technologies for In Situ Chemical Reduction (ISCR) along with TERRAMEND, AQUABLOK+, EHC-O, O-SOX, and mGCW systems to address myriad soil, sediment and groundwater impacts.

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