Combined adsorption and oxidation mechanisms of hydrogen sulfide on granulated coal ash

Abstract

Hydrogen sulfide is highly toxic to benthic organisms and may cause blue tide with depletion of dissolved oxygen in water column due to its oxidation. The purpose of this study is to reveal the combined adsorption and oxidation mechanisms of hydrogen sulfide on granulated coal ash which is a byproduct from coal electric power stations to apply the material as an adsorbent for hydrogen sulfide in natural fields. Sulfur species were identified in both liquid and solid phases to discuss removal mechanisms of the hydrogen sulfide with the granulated coal ash. Batch experiments revealed that hydrogen sulfide decreased significantly by addition of the granulated coal ash and simultaneously the sulfate ion concentration increased. X-ray absorption fine structure analyses showed hydrogen sulfide was adsorbed onto the granulated coal ash and successively oxidized by manganese oxide (III) contained in the material. The oxidation reaction of hydrogen sulfide was coupling with reduction of manganese oxide. On the other hand, iron containing in the granulated coal ash was not involved in hydrogen sulfide oxidation, because the major species of iron in the granulated coal ash was ferrous iron which is not easily reduced by hydrogen sulfide.

Mechanistic study of PFOS adsorption on kaolinite and montmorillonite

“…NEXAFS is sensitive to the structure change near the target atom, and is used as a probe for the chemical state of sulfur in minerals and chemical compounds [34]. Because sulfonate group serves as the functional and active moiety in PFOS molecules, S K-edge NEXAFS can be applied to the structural analysis for PFOS surface complex.…”

Estimation of hydrogen sulfide removal efficiency with granulated coal ash applied to eutrophic marine sediment using a simplified simulation model

“…When GCA was applied to the sediment collected from the Ohko Inlet, oxygen consumption decreased significantly with increasing application dosage of GCA, because the GCA adsorbed and oxidized the hydrogen sulfide. Incidentally, the oxidation of hydrogen sulfide by the GCA does not necessarily involve oxygen (Asaoka et al, 2012b). For Ohzu Inlet, 1,921 mg of oxygen were consumed by sulfide oxidation at the control throughout the experiment periods (Fig.…”

“…The process involves adding cement as a binder to a ratio of approximately 15% of the final product. GCA is mainly composed of SiO 2 , CO 3 , Al 2 O 3 , CaO, organic carbon, and Fe 2 O 3 with quartz and aluminosilicate crystal phase, in concentrations of 395, 133, 126, 55.4, 27.4, and 22.5 g kg -1 , respectively (Asaoka et al, 2012b). The environmentally regulated substances dissolved from the GCA used in this study were obviously below the standard levels for environmental criteria in Japan (Asaoka et al, 2008).…”

“…Several environmental remediation agents have been developed to remove hydrogen sulfide from eutrophic marine sediments, including granulated coal ash, crushed oyster shells and steel slags (Asaoka et al, 2009a;Asaoka et al, 2012b;Kim et al, 2012;Asaoka et al, 2013;Asaoka et al, 2014). In this study, we focused on granulated coal ash (GCA) because of its high adsorption capacity (108 mg S g −1 ) for hydrogen sulfide (Asaoka et al, 2009b).…”

A Study on Changes in Pore Water Quality of Polluted Sediment due to Mixing Ratio of Granulated Coal Ash

“…연안 저서환경 개선에 대한 연구는 꾸준히 진행되어 왔으 며, 자원재활용의 관점에서 산업폐기물을 이용하는 많은 연 구가 수행되어 왔다 (Li et al, 2017;Martins, 2017;Asaoka et al, 2012). 이와 관련하여 비산재에 시멘트를 첨가하여 조 립화 한 석탄회 조립물은 인산염의 용출 및 황화수소의 발생 을 효과적으로 억제하여 환원저질을 개선할 수 있는 것으로 보고되고 있다 (Kim et al, 2014…”