Kim, Eun-Ju Park, Saerom Adil, Sawaira Lee, Seunghak Cho, Kyungjin 2024-01-19T15:02:39Z 2024-01-19T15:02:39Z 2022-01-10 2021-04 0013-936X https://pubs.kist.re.kr/handle/201004/117185 In this study, the effects of in situ chemical oxidation (ISCO) on the biogeochemical properties of an aquifer soil were evaluated. Microcosms packed with an aquifer soil were investigated for 4 months in two phases including oxidant exposure (phase I) and biostimulation involving acetate addition (phase II). The geochemical and microbial alterations from different concentrations (0.2 and 50 mM) of hydrogen peroxide (HP) and peroxymonosulfate (PMS) were assessed. The 50 mM PMS-treated sample exhibited the most significant geochemical changes, characterized by the decrease in pH and the presence of more crystalline phases. Microbial activity decreased for all ISCO-treated microcosms compared to the controls; particularly, the activity was severely inhibited at high PMS concentration exposure. The soil microbial community structures were shifted after the ISCO treatment, with the high PMS causing the most distinct changes. Microbes such as the Azotobacter chroococcum and Gerobacter spp. increased during phase II of the ISCO treatment, indicating these bacterial communities can promote organic degradation despite the oxidants exposure. The HP (low and high concentrations) and low concentration PMS exposure temporarily impacted the microbial activity, with recovery after some duration, whereas the microbial activity was less recovered after the high concentration PMS exposure. These results suggest that the use of HP and low concentration PMS are suitable ISCO strategies for aquifer soil bioattenuation. English American Chemical Society Biogeochemical Alteration of an Aquifer Soil during In Situ Chemical Oxidation by Hydrogen Peroxide and Peroxymonosulfate Article 10.1021/acs.est.0c06206 1 Environmental Science & Technology, v.55, no.8, pp.5301 - 5311 Environmental Science & Technology 55 8 5301 5311 N scie scopus 000643546400108 2-s2.0-85104926118 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article CONTAMINATED SOIL SP-NOV. MICROBIAL COMMUNITY BACTERIAL COMMUNITIES PERSULFATE REMEDIATION DEGRADATION PH DIVERSITY DOMINANT in situ chemical oxidation (ISCO) aquifer soil microcosm microbial community structure hydrogen peroxide (HP) peroxymonosulfate (PMS)