Feasibility of Soil Vapor Extraction Systems in Low Permeability Soils

Soil vapor extraction (SVE)systems can be used to remediate enviornmental sites that have been contaminated with petroleum products. However, SVE systems rely on pore space in soils to draw the vapors through the soil, creating a vacuum. Therefore, SVE systems are not as effective when used in low permeability soils. This study aims to determine whether SVE systems can be used on low permeability soils in conjunction with companion technologies. The results indicate that SVE systems can be utilized in low permeability soils if used in conjunction with companion technologies that increase soil permeability and cantaminant volatilization. The promising companion technology is six-phase soil heating, based on contamination removal rate and cost estimates.

Agriculture and sustainable development: The role of small scale agriculture in obtaining food security

The international community has expressed a renewed interest in small scale agriculture and the role it plays in long-term food security in the face of climate change and population growth. This interest has led to a new development paradigm in which small scale producers are being brought into the global market. Undoubtedly, small scale agriculture should be pursued as a sustainable form of development which can contribute to poverty alleviation, environmental stewardship, and the preservation of genetic diversity. These unique contributions are inherently threatened by a system captured in the idea of the neoliberal food regime. The ability of small scale agriculture to uphold the goals of food security are dependent on recognition and preservation of these contributions.