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Degradation of 2-chlorobenzoic acid in stabilised/solidified soil systems

Harbottle, Michael John ORCID: and Al-Tabbaa, A. 2008. Degradation of 2-chlorobenzoic acid in stabilised/solidified soil systems. International Biodeterioration & Biodegradation 61 (2) , pp. 173-181. 10.1016/j.ibiod.2007.07.002

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The possibility of facilitating organic contaminant biodegradation within eight different stabilised/solidified soil systems was investigated. Two soils, a silty sand and clayey silt contaminated with 2-chlorobenzoic acid, were mixed with two different grouts; Portland cement grout and a magnesium phosphate cement grout. The effect of a soil amendment (green waste compost) was examined. Biological activity was monitored using plate counts and dehydrogenase activity. After 106 days, contamination within the silty sand soil/Portland cement mix was reduced by approximately 60% on average, and by over 95% on average with compost addition. Cement grout addition gave substantial changes in the microbial communities present, with Portland cement leading to initial decreases in microbial numbers (by up to a factor of 104) but with a corresponding increase in dehydrogenase activity (by 250% with added compost). Subsequently, microbial numbers increased and the dehydrogenase activity reduced to negligible levels. Magnesium phosphate cement addition led to a decrease in the presence of bacteria and an increase in fungi, whilst with added compost high levels of dehydrogenase activity were maintained for 106 days. It is concluded that contaminant degradation can occur in stabilised/solidified soil systems, but the role of microbes in this removal is not certain.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
T Technology > TD Environmental technology. Sanitary engineering
Uncontrolled Keywords: Contaminated land; Stabilisation/solidification; Bioremediation; Sustainability
Publisher: Elsevier
ISSN: 0964-8305
Last Modified: 17 Oct 2022 10:21

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