Use of methanotrophically activated biochar in novel biogeochemical cover system for carbon sequestration: Microbial characterization.

Biochar-amended soils have been explored to enhance microbial methane (CH) oxidation in landfill cover systems. Recently, research priorities have expanded to include the mitigation of other components of landfill gas such as carbon dioxide (CO) and hydrogen sulfide (HS) along with CH. In this study, column tests were performed to simulate the newly proposed biogeochemical cover systems, which incorporate biochar-amended soil for CH oxidation and basic oxygen furnace (BOF) slag for CO and HS mitigation, to evaluate the effect of cover configuration on microbial CH oxidation and community composition.

Effect of temperature on methane oxidation and community composition in landfill cover soil.

Municipal solid waste (MSW) landfills are the third largest anthropogenic source of methane (CH) emissions in the United States. The majority of CH generated in landfills is converted to carbon dioxide (CO) by CH-oxidizing bacteria (MOB) present in the landfill cover soil, whose activity is controlled by various environmental factors including temperature. As landfill temperature can fluctuate substantially seasonally, rates of CH oxidation can also vary, and this could lead to incomplete oxidation.

Quantitative Assessment of Life Cycle Sustainability (QUALICS): Framework and its application to assess electrokinetic remediation.

In recent years, the broader environmental impacts of remediation that arise from different remediation activities has drawn attention of practitioners, remediation design professionals and academicians to evaluate the net environmental benefit of environmental remediation projects. The main objective of this paper is to describe the Quantitative Assessment of Life Cycle Sustainability (QUALICS) framework, a new tool developed to strengthen decision-making in the selection of sustainable remedial technologies for the clean-up of contaminated sites. The proposed framework is a combination of two multi-criteria evaluation methods namely, the Integrated Value Model for Sustainable Assessment (MIVES) and Analytic Hierarchy Process (AHP).

Effect of basic oxygen furnace slag type on carbon dioxide sequestration from landfill gas emissions.

This study investigates the carbon dioxide (CO) sequestration potential of three different basic oxygen furnace (BOF) slags (IHE-3/15, IHE-9/17, and Riverdale) subjected to simulated landfill gas (LFG) conditions (50% CH and 50% CO v/v) in a series of batch and column experiments. Batch experiments were performed at different moisture contents (0%, 10%, 15% and 20% moisture by weight) and temperatures (7 °C, 23 °C and 54 °C) to examine the effect of moisture and temperature on the CO sequestration potential of the BOF slags. The column experiments were conducted under continuous humid gas flow conditions.

Effect of basic oxygen furnace slag particle size on sequestration of carbon dioxide from landfill gas.

The mineral carbon sequestration capacity of basic oxygen furnace (BOF) slag offers great potential to absorb carbon dioxide (CO) from landfill emissions. The BOF slag is highly alkaline and rich in calcium (Ca) containing minerals that can react with the CO to form stable carbonates. This property of BOF slag makes it appealing for use in CO sequestration from landfill gas.