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  • Asbestos in Soils

    Introduction/principles

    The term asbestos refers to six unique naturally occurring silicate substances that belong to the serpentine and amphibole mineral families. The three most commonly used asbestos minerals are Crocidolite (blue asbestos), Chrysotile (white asbestos), Amosite (brown asbestos).  The other three are rarely used in building products and these are Tremolite, Anthophyllite and Actinolite. Chrysotile is the only type of asbestos belonging to the serpentine family. 

  • Chemical Oxidation

    Introduction/principles

    In chemical oxidation, chemicals are added to the plume area to chemically oxidise contaminants into less hazardous or less toxic compounds which are also more stable and less mobile. In the case of organic compounds such as petroleum, they are converted into carbon dioxide and water. It is also possible, under the correct conditions and controls, to undertake oxidation as part of an above ground water treatment system.

  • Demolition and Site Clearance

    Brownfield and contaminated land remediation for return to beneficial use should not start and finish with the remediation technologies. VertaseFLI have a long established history of incorporating demolition works into the wider remediation project with great benefit to our clients.

    By maximising the synergies between the demolition and remediation works we can ensure an integrated approach to materials management and re-use.

  • Dual / Multi Phase Vacuum Extraction

    Introduction/principles

    DPE is an in-situ remediation method involving the combined extraction of liquids, water, free phase product and vapour from the vadose and phreatic zones of the contamination plume. Dual-phase vacuum extraction is not a strictly accurate description and multi-phase may be a better suited term dependent on site objectives and conditions. The three phases that are generally extracted are:

  • Enabling Works

    Whatever you need to get the development moving we are here to sort it!  Remediation is only a small part of the works required to prepare a site for development and we regularly encompass a wider scope of works to facilitate development.  This can include groundworks, civil engineering, foundations, infrastructure and drainage works for residential and non-residential schemes, we can offer a full contracting service, either independently of, or integrated with, other enabling, demolition and remediation works.

  • Ex-Situ Bioremediation

    Introduction/principles

    Ex-situ bioremediation is a biological process in which excavated soil is placed in a lined above-ground treatment area and aerated following processing to enhance the degradation of organic contaminants by the indigenous microbial population. Under aerobic conditions, specific micro-organisms can utilise organic contaminants such as petroleum hydrocarbon mixtures, polycyclic aromatic hydrocarbons (PAH), phenols, cresols and some pesticides as a source of carbon and energy and degrade them ultimately to carbon dioxide and water.

  • Free Product Recovery

    Introduction/Principles

    Many heavily contaminated sites have free products within the soils and water table. Removal of this free product is of primary importance in the remediation of any contaminated site, as free phase contaminants provide the biggest reservoir for contaminants to migrate and cause further pollution.

    There are two types of free product:

    Light non-aqueous phase liquids (LNAPL): these contaminants are less dense than water and float on the water table surface.

  • In-situ Biological Treatment

    Introduction/Principles

    In-situ bioremediation is the remediation of soils and/or groundwater utilising the indigenous naturally occurring microorganisms in order to biologically degrade contaminants. The development of the microbial culture within the remediation zone can be with oxygen, (aerobic or oxidising) or without oxygen (anaerobic or anoxic). This is dependant on the nature of the contaminants that require degradation.

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