TYPES OF SOIL REMEDIATION
In dealing with the impact of site contamination and land remediation, governments, local authorities and organizations are increasingly focusing on social, environmental and commercial solutions that support human health and the environment.
Managing all the complexities and liabilities associated with historic contamination, leaving stakeholders free to focus on the future of their business. We can mitigate the risks posed by contaminated land, protecting current assets through monitoring and management.
Once a need for soil remediation is recognized, the best available technology is selected, according to the nature, toxicity, and origin of the contaminant, the present and potential hazard related to the degree of contamination, the chemical and physical characteristics of the soil, the land use, the time available for remediation, the community acceptance, and a cost-benefit analysis.
Traditionally, there are three main soil remediation technologies: soil washing, bioremediation and thermal desorption.
Soil washing is a process that uses surfactants and water to remove contaminants from the soil. The process involves either dissolving or suspending pollutants in the wash solution and separates the soil by particle size Bioremediation involves the use of living microorganisms, such as bacteria and fungi, to break down organic pollutants in the soil. In thermal desorption, heat is used to increase the volatility of contaminants, so that they can be separated from the solid material. The contaminants are then either collected or destroyed.
Thermal desorption is the most proven and successful technology used for hydrocarbon contamination, and typically direct fired plants have been used for low levels of contamination. Lately, indirect fired units are more commonly used because of their versatility and their ability to recapture the hydrocarbons.
A typical thermal desorption unit consists of two main processes. In the first, contaminated solids are heated to the boiling point of the contaminants. The volatized contaminants are then pumped to the second part of the process, where the vapor is either destroyed by a thermal oxidizer or condensed in a vapor recovery unit (VRU).
Thermal soil remediation is an efficient, environmentally beneficial process. This operation eliminates contamination in the soil in an efficient manner every time. Because the soil can be reused after it is cleaned and purified, it is diverted from landfills, saving valuable space. Through soil remediation, hazardous chemicals and hydrocarbons are removed from the earth, protecting the health of the environment and the population.
From project concept to completion and beyond, at Environmental Construction Group (ECG) have the scale and expertise to work with clients on large complex areas of contaminated lands and small legacy sites. Whether planning a change of use for a site or rehabilitating a brownfield site, we can evaluate ground constraints, opportunities, and sustainability considerations. We place great importance on understanding our clients’ businesses and challenges, while taking a pragmatic and balanced approach to ensure our solutions deliver long-term commercial, environmental and economic success.
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