H2S removal using cellular concrete waste as filtering material: Reactions identification and performance assessment

Abstract

Highlights-H2S removal using cellular concrete waste was investigated-Cellular concrete is efficient for removing H2S in abiotic conditions-H2S reacts with CaCO3 in wet conditions to form gypsum-At EBRT = 56 s, a maximum elimination capacity of 7.8 g m-3 h-1 was calculated

Hybrid Filtration Process for Gas Desulfurization

“…CC is mainly composed of SiO 2 (50.5% in weight), CaO (24.6%), SO 3 (19.7%), Al 2 O 3 (2.2%), P 2 O 5 (1.4%) and Fe 2 O 3 (1.3%). It was evidenced that in the presence of H 2 S, and under wetted conditions, complex physico-chemical mechanisms occur between H 2 S and the CC components, simultaneously leading to the H 2 S removal and a modification in the composition of the material [22,23]. The ability of the CC to remove H 2 S as well as its lifetime were predicted from experimental results [22].…”

“…Before its use as a packing mater was sieved to use only pieces around 10 mm in diameter. CC is mainly composed (50.5% in weight), CaO (24.6%), SO3 (19.7%), Al2O3 (2.2%), P2O5 (1.4%) and Fe2O3 (1 was evidenced that in the presence of H2S, and under wetted conditions, complex p chemical mechanisms occur between H2S and the CC components, simultaneously to the H2S removal and a modification in the composition of the material [22,23]. The of the CC to remove H2S as well as its lifetime were predicted from experimental resu Expanded schist (Granulex company, Mayenne, France, www.granulex.fr), a lig dish-brown material with a smooth surface, is a type of rock with a characteristic l foliated structure.…”

“…However, to date, there are only few sources of data on the ability of the cellular concrete to remove H 2 S, and further investigations are still needed to improve knowledge on this process. The first findings on this topic [22,23] showed that reactions occurring between H 2 S, O 2 and the components of the cellular concrete (mainly calcium oxides and ferric oxide) modify the structure of the material, leading to gypsum formation (CaSO 4 2H 2 O), which, consequently, limits its lifetime. The presence of large amounts of sulfate in water (Figure 6) confirmed the reaction mechanisms leading to gypsum formation due to reactions of calcium carbonate or calcium hydroxide with sulfuric acid (note that the decrease in the sulfate concentration observed after day 64 is due to water replacement to keep pH > 1).…”

Utilization of Concrete Waste as the Substitute for Coarse Aggregates in Asphalt Mixtures

“…Thus, the thread drawn from previous research is that the compressive strength of environmentally friendly concrete (green concrete) meets the requirements of compressive strength of concrete structures. Lebrun et al [20] manage concrete waste for H2S filtration, and it will bring benefits for the humidification step in biofiltration systems. According to Letelier [21], the combination of glass powder and fine recycled concrete aggregate on mortar will reduce CO 2 emission and greenhouse gas.…”

Assessing utilization potential of waste concrete as a biofilm media and evaluating NH3 removal performance

“…이러한 문제를 개선하기 위 해서는 내구성이 우수한 무기성 담체가 개발될 필요가 있 음이 꾸준히 제기되어 왔으며 생분해 손실이 적은 세라믹, 화산석, 및 화강암 등 무기물질을 바이오필터용 담체로 활 용하기 위한 연구가 수행되어 왔다 (Jeong et al, 2005;Ait-Lasri et al, 2008 1). (Bowker, 2000;Barbosa et al, 2004;Lebrero et al, 2010;Lebrero et al, 2011;Jaber et al, 2017;Vikrant et al, 2018;Lebrun et al, 2019). 춘천시 하수처리 장의 폭기조에서 수거된 활성슬러지 혼합액의 성분은…”