Improvement of bacterial methane elimination using porous ceramsite as biocarrier

Abstract

BACKGROUNDMethane is a greenhouse gas (GHG) which contributes to climate change. Biofiltration with immobilized methane‐oxidizing bacteria (MOB) is a promising option to eliminate methane. In order to achieve high methane removal efficiency (RE), the appropriate carrier material with favorable characteristics to perform well in MOB immobilization and methane elimination, must be selected.RESULTSA MOB consortium was enriched from landfill soil and immobilized on porous materials to eliminate methane at high (∼20% (v/v)) and low (∼1% (v/v)) concentrations. The methane elimination capacities of immobilized MOB were evaluated and the microbial immobilization abilities of materials were compared. Results showed that MOB inoculated in black ceramsite (BC) permitted the highest elimination capacity (EC) of 5.36 ± 0.29 µmol h‐1 cm‐3 at the methane concentration of ∼20% (v/v), which was almost 3.6 times that of suspended cells. At a methane concentration of ∼1% (v/v), the MOB incorporated with red ceramsite (RC) exhibited the optimal EC of 1.48 ± 0.03 µmol h‐1 cm‐3, which was 64% higher than the control. Biophosphorus tests showed that BC and RC could immobilize more MOB cells than active carbon (AC), and SEM images, MB adsorption tests, BET and FTIR indicated that their large pore and surface properties might favor MOB immobilization.CONCLUSIONCeramsite with desirable porosity and surface properties could promote MOB immobilization, and further improve the methane elimination capacity, and might be a favorable biocarrier in MOB biofilters. © 2018 Society of Chemical Industry

Conversion of Renewable Biogas into Single-Cell Protein Using a Combined Microalga- and Methane-Oxidizing Bacterial System

“…The MOB used in this study was mixed strains and mainly included 53.53% of Methylophilus and 0.003% of Methylomonas. 5 The MG and MOB strains were cultured using blue−green11 (BG11) medium and nitrate mineral (NMS) medium, respectively. Also, the ND medium, respectively.…”

Methane Elimination Using Biofiltration Packed With Fly Ash Ceramsite as Support Material

“…The MOB consortium was enriched from the soil, which was harvested from Xiaojianxi Landfill in Qingdao, Shandong, China. The enrichment processes were in compliance with the reported methods, and the nitrate mineral salts (NMS) medium with pH of 6.8 was used to provide nutrient elements for MOB (Sun et al, 2018c). Before inoculation, the MOB consortium was cultivated under methane concentration of 20% (v/v) at 25 • C with continuous shaking of 140 rpm.…”

“…In our previous study, the MOB consortium has been inoculated in ceramsite to eliminate methane in batch experiments. The results showed that the MOB cells incorporated with black and red ceramsite prepared from fly ash and clay, respectively, kept improved methane ECs, which were 54.4% and 64.4%, respectively, higher than that of the suspended MOB cells during disposing 1% (v/v) of methane (Sun et al, 2018c). In this study, to verify the superiority, availability and stability of ceramsite in biofiltration for methane elimination, three lab-scale biofilters packed with fly ash ceramsite (FAC), clay ceramsite (CC) and active carbon, respectively, as support materials were constructed.…”

Moving from alcohol to methane biofilters: an experimental study on biofilter performance and carbon distribution

“…methanol, ethanol) to greenhouse gases (GHGs) [e.g. methane (CH 4 )] . According to US EPA 2018 (United States Environmental Protection Agency, 2018), atmospheric methanol and ethanol emissions are considered as hazardous air pollutants.…”

“…methane (CH 4 )]. 1,2 According to US EPA 2018 (United States Environmental Protection Agency, 2018), 3 atmospheric methanol and ethanol emissions are considered as hazardous air pollutants. Methanol is broadly used as an organic solvent in the dye, resin and adhesive industries, as a feedstock for petrochemicals and as an additive for wastewater treatment units at denitrification step.…”