Alpha Environmental - services

By: Alpha Environmental  05/12/2011
Keywords: groundwater, Contaminants

UK National Helpline: 0800 083 3524
ROI National Helpline: 1800 242 698

Alpha Environmental has over 15 years experience in the investigation, design, installation, operation and management of remediation systems and would be considered leaders in our field.

We have quickly built ourselves the reputation of providing practical, value for money and sustainable remediation solutions and as a result we are a trusted preferred supplier to many national and international companies operating in the UK and Ireland and beyond.

Most of the remedial technologies and techniques that we offer have been developed in-house through our own research and development programme – please see our R&D section.

Alpha offers the following technologies and techniques which are often used in conjunction with each other in a treatment train approach:

Enhanced In-situ & ex-situ bioremediation
This technique bolsters ongoing natural bio-degradation of contaminants via engineered and monitored conditions and the application of microbes, nutrients and vital elements. Enhanced bio remediation can be applied both in-situ and ex-situ for the degradation of organic contaminants to environmentally benign break down products.

In-situ & ex-situ chemical oxidation
A technique utilising the direct introduction of a chemical oxidant combined with an initiator for the total destruction of organic contaminants. This technique can be applied both in-situ and ex-situ, and is often used in conjunction with other techniques for the remediation of more recalcitrant residual contaminants particularly in heavy clays.

Excavation and licensed disposal
Excavation of contaminated materials for licensed disposal at an off-site waste facility, with the provision of groundwater control and treatment as required.

Enhanced Monitored Natural Attenuation (EMNA)
EMNA refers to the reliance on natural processes to achieve site-specific remedial objectives. EMNA usually includes a variety of physical, chemical, or biological processes that, under favourable conditions, act with or without human intervention to reduce mass, toxicity, mobility, volume or concentration of contaminants in soils, waters and airs.

Air Sparging
In-situ sparging is where compressed air is introduced at depth which produces simultaneous volatilisation of soil and groundwater contaminates. This technique is often used in conjunction with vacuum to create a pressure gradient and capture the off-gasses for ex-situ treatment.

Single Vacuum Extraction (SVE)
Single - phase Vacuum Extraction is a pressure reduction technique to encourage direct in-situ volatilisation of available contaminants with subsequent recovery of soil vapours to one location for ex-situ treatment if required. This process can also be utilised for vapour recovery and subsurface pressure control in conjunction with other technologies, as well as breathing zone extraction to improve internal air quality.

Dual Vacuum Extraction (DVE)
Dual - phase Vacuum Extraction is a development of SVE utilised for the simultaneous bulk recovery of soil vapours, Light Non-Aqueous Phase Liquids (LNAPL) and contaminated ground water without the need for complex pumps, groundwater drawdown or strata fracturing. All phases are recovered to one ex-situ location for ease of subsequent treatment if required.

Abstraction and multi-stage treatment
The use of down well or surface located liquid pumps for the recovery of LNAPL, Dense Non-Aqueous Phase Liquids (DNAPL) and contaminated groundwater for subsequent treatment at one location. This technique is applied in situations where other technologies may not be applicable, for example operation in deep bedrock, and is often enhanced by the application of vacuum.

Vacuum Enhanced Free Product Recovery (VEFPR)
Vacuum Enhanced Free Product Recovery is an advanced in-situ technique for the direct recovery of LNAPL whilst minimising groundwater recovery and hence subsequent treatment. This technique can recover bulk LNAPL down to layers < 1.0mm thick, whilst simultaneously encouraging migration of LNAPL to wells without the need for draw-down and complicated pumps.

Active and Passive Venting Systems
Individually designed site specific room, floor void, duct or sub-floor preferential flow venting systems to oxygenate and promote biological breakdown, capture ongoing remedial off-gasses, or provide a change of contaminated breathing zone air volume with ambient air.  Such systems can include active pumps or passively driven pumps utilising environmental energy via wind and solar power.

Cut - off walls and Barriers
Cut  - off walls and barriers are often used to either partition contaminated high risk media from clean or low risk materials, capture and immobilise migrant contaminants, or to provide a physical flow path barrier.  Materials and systems employed include MDPE and pre-hydrated bentonite hanging subsurface barriers, buried bentonite/cement slurry walls, and curtain well capture systems.

We will continue to develop our range of technologies to offer our customers the best available solution to their problems.

We will continue to place our customers and their needs at the centre of everything we do.

Keywords: Contaminants, groundwater