Removal Of Flue Gas Research Articles

Insight into the Fine Particle Removal in Flue Gas by the Insertion of a Swirling Wet Electrostatic Precipitator

Insight into the Fine Particle Removal in Flue Gas by the Insertion of a Swirling Wet Electrostatic Precipitator

Hollow tubular MnOx prepared by flame annealing with cotton fiber as sacrificial template and its applications for Hg0 adsorption in flue gas

The mass discharge of mercury from coal-fired power plant has caused great harm, abating mercury emissions is of preoccupation for protecting public environmental safety and human health. Metal oxides are often used for Hg0 removal in the flue gas. In this paper, a hollow tubular MnOx(MnCot) was successfully prepared by rapid flame annealing using cotton fiber as a sacrificial template. The MnCot were then well characterized and tested for its capability for Hg0 removal in flue gas. The results indicate that the flame assisted synthesis method for rapidly prototyping metal oxides with typical structures is achievable. The hollow tubular structure of the cotton fiber is well reprinted with good crystallization of Mn3O4. The inner diameter of the hollow tubular MnCot is about 10 μm, and the thickness of the tube is about 1 μm. The Hg0 removal efficiency on MnCot can be maintained as high as 90 % under simulated flue gas atmosphere below 240°C. O2 and NO have a positive effect on the Hg0 removal, which can act as the fresh active sits thus enhancing its capability for Hg0 removal. However, the presence of SO2 will result in the surface sulfation on MnCot, thus deteriorating its capability for Hg0 removal. Further, the competitive adsorption between SO2 and Hg0 on the material will also weaken its capability for Hg0 removal. The hollow tubular MnOx rapidly prepared by one-step flame annealing has a good industrial application potential for Hg0 removal in coal-fired flue gas.

Microbial induced carbonate precipitation for cadmium removal in flue gas from sludge incineration

Flue gas cadmium emission during sludge incineration damages to the health of humans and ecological environment due to its toxic, persistent, and bioaccumulation. Cadmium removal in flue gas based on microbial induced carbonate precipitation (MICP) was investigated using a denitrifying membrane biofilm reactor (DBR). Cadmium removal efficiency obtained 89.8%. Caenispirillum, Halomonas, Stappia, Thauera were the dominant aerobic denitrifiers, which carried twelve cadmium resistance genes (czcA, czcB, czcC, czcD, cadA, cadC, cmtR, cueR, copZ, ctpC, zipB, zntA), and expressed six cadmium resistant proteins (ZntA, CzcA, CtpA, CopZ, CopR and CopB) and ten denitrifying proteins(NarG, NarH, NarI, NapA, NapB, NirK, NirS, NorB, NorC, NosZ), those proteins regulated binding, transport, exportation of cadmium and denitrification. The upregulation of nitrate reductase and nitrite reductase indicated that cadmium could promote the reduction of NO3- to NO, as shown by an integrated metagenomic and metaproteomic sequencing. Cadmium speciation of biofilms, such as cadmium carbonate, increased in proportion, whereas others, such as organic matter-bound cadmium, decreased. The biological adsorption process would gradually yield to MICP process. The MICP stabilized cadmium in flue gas mainly by precipitating Cd through sodium succinate-induced carbonate precipitation. Flue gas cadmium could transform to cadmium carbonate bioprecipitate; carboxyl, hydroxyl and amine groups in cell surface and humic acid could complex cadmium to form Cd-EPS. Denitrifying bacteria could induce MICP process to stabilize cadmium in flue gas. This provides a green and low-cost DBR process as advanced treatment technology for remove cadmium from flue gas.

Constructing Heterointerfaces in Dual-Phase High-Entropy Oxides to Boost O2 Activation and SO2 Resistance for Mercury Removal in Flue Gas.

The low O2 activation ability at low temperatures and SO2 poisoning are challenges for metal oxide catalysts in the application of Hg0 removal in flue gas. A novel high-entropy fluorite oxide (MgAlMnCo)CeO2 (Co-HEO) with the second phase of spinel is synthesized by the microwave hydrothermal method for the first time. A high efficiency of Hg0 removal (close to 100%) is achieved by Co-HEO catalytic oxidation at temperatures as low as 100 °C and in the atmosphere of 145 μg m-3 Hg0 at a high GHSV (gas hourly space velocity) of 95,000 h-1. According to O2-TPD and in situ FT-IR, this extremely superior catalytic oxidation performance at low temperatures originates from the activation ability of Co-HEO to transform O2 into superoxide and peroxide, which is promoted by point defects induced from the spinel/fluorite heterointerfaces. Meanwhile, SO2 resistance of Co-HEO for Hg0 removal is also improved up to 2000 ppm due to the high-entropy-stabilized structure, construction of heterointerfaces, and synergistic effect of the multicomponents for inhibiting the oxidation of SO2 to surface sulfate. The design strategy of the dual-phase high-entropy material launches a new route for metal oxides in the application of catalytic oxidation and SO2 resistance.

A microporous Cd(II)-MOF for efficient separation of trace SO2 from SO2/CO2/N2 mixture

Trace SO2 removal of flue gas is very important to prevent environmental pollution. Porous Metal-Organic Frameworks (MOFs) possess natural advantages for the mixed gas separation. In the present work, a new microporous Cd(II)-MOF (named HBU-23) has been conveniently synthesized, it possesses a three dimensional (3D) coordination network with trinuclear cluster units. The BET surface area of HBU-23 reaches 384.20 m2/g and the pore size distribution is 6.79 Å. HBU-23 exhibits excellent adsorption ability for SO2, and the saturated adsorption capacity can reach 91.38 cm3/g under ambient condition. More importantly, the compound exhibits higher IAST selectivities for the mixture gases of SO2/CO2 (10 %, 58.9), SO2/N2 (10 %, 2333.5) and SO2/CH4 (10 %, 484.8), which indicate its’ possible applications in the field of flue gas and natural gas desulfurization. Breakthrough experiments further prove that it can be efficiently removal trace SO2 from flue gas, and it can be reused at least three cycles without obvious degradation in separating ability. Furthermore, HBU-23 also shows better separation selectivity of C2H2/CO2 (50 %, 3.0) and CO2/N2 (15 %, 28.4). GCMC simulations and DFT calculations reveal its effective separation property can attribute to the strong interaction and binding energy between HBU-23 and SO2 molecules. The work will contribute to the rational design new MOFs used as gas adsorbents.

АНАЛИЗ РАБОТЫ ПЕЧИ ДЛЯ НАГРЕВА ВОДОРОДСОДЕРЖАЩЕГО ГАЗА

The article analyzes the efficiency of a vertical flare furnace used to heat hydrogen-containing gas in a hydrodealkylation plant. It was found that the furnace has low efficiency, the value of which is influenced by multiple factors. To increase the efficiency of the existing furnace, a com-prehensive solution was proposed, including the reconstruction of the coil, the fuel and oxidizer supply system, and the flue gas removal system

Mechanistic insights into 1,2,4-trichlorobenzene removal in flue gas by aerobic denitrifying membrane biofilm reactor

1,2,4-Trichlorobenzene (1,2,4-TrClBz) as dioxin indicator in municipal solid waste incineration can increase risk of human health. Aerobic denitrifying membrane biofilm reactor (MBfR) was investigated for 1,2,4-TrClBz removal in flue gas. During the 75 days of operation, 1,2,4-TrClBz removal efficiency achieved 94%. Pseudomonas, Halomonas, Paracoccus, Thauera, Azoarcus, Proteiniphilum, Mesorhizobium, Pelagibacterium, Chelativorans were the core 1,2,4-TrClBz biodegrading-denitrifying bacteria. 1,2,4-TrClBz biodegradation genes and denitrification genes were responsible for the oxidation of 1,2,4-TrClBz and nitrate reduction. 1,2,4-TrClBz was degraded by ring-cleavage before aerobic dechlorination, 1,2,4-TrClBz bio-oxidation was coupled to denitrification formed redox between 1,2,4-TrClBz and nitrate, as shown by metagenomic sequencing and untargeted metabolomic analysis. Therefore, MBfR effectively achieved bioremoval and biodegradation of 1,2,4-TrClBz in flue gas by aerobic denitrification, which may provide a feasible and environment-friendly biotechnique for decontamination of chlorobenzene compounds in flue gas.

Arsenic removal in flue gas through anaerobic denitrification and sulfate reduction cocoupled arsenic oxidation

Arsenic in flue gas from municipal solid waste incineration can damage to human health and ecological environment. A sulfate-nitrate-reducing bioreactor (SNRBR) for flue gas arsenic removal was investigated. Arsenic removal efficiency attained 89.4%. An integrated metagenomic and metaproteomic investigation showed that three nitrate reductases (NapA, NapB and NarG), three sulfate reductases (Sat, AprAB and DsrAB), and arsenite oxidase (ArxA) regulated nitrate reduction, sulfate reduction and bacterial As(III)-oxidation, respectively. Citrobacter and Desulfobulbus could synthetically regulate the expression of arsenite-oxidizing gene, nitrate reductases and sulfate reducatases, which involved in As(III) oxidation, nitrate and sulfate reduction. A bacterial consortium containing Citrobacter, UG_Enterobacteriaceas, Desulfobulbus and Desulfovibrio could capable of simultaneously arsenic oxidation, sulfate reduction and denitrification. Anaerobic denitrification and sulfate reduction were cocoupled to arsenic oxidation. The biofilm was characterized by FTIR, XPS, XRD, EEM, and SEM. XRD and XPS spectra verified the formation of aarsenic species (As(V)) from flue gas As(III) conversion. Arsenic speciation in biofilms of SNRBR consisted of 77% residual arsenic, 15.9% organic matter-bound arsenic, and 4.3% strongly absorbed arsenic. Flue gas arsenic was bio-stabilized in the form of Fe–As–S and As-EPS through biodeposition, biosorption and biocomplexation. This provides a new way of flue gas arsenic removal using the sulfate-nitrate-reducing bioreactor.

Flue gas arsenic trioxide removal from sludge incineration by sulfate-reducing membrane biofilm reactor

Arsenic in flue gas from sludge incineration may damage to human health and ecological environment seriously. The sulfate-reducing membrane biofilm reactor (SRBR) was investigated for arsenic trioxide(As2O3) removal in flue gas from sludge incineration. Arsenic removal efficiency attained 94.4%. Desulfovibrio, UC_Clostridiales, and Pseudodesulfovibrio were the dominant genera. Desulfovibrio was the core arsenite-oxidizing-sulfate-reducing genus. Arsenite oxidase (ArxA) and sulfate-reducing enzymes (Sat, AprAB and DsrAB) responsible for bacterial As(III)-oxidation and sulfate reduction. Desulfovibrio could synthetically regulate the expression of functional proteins that involved in As oxidation, sulfate reduction, cell wall and membrane synthesis, antioxidant, DNA repair, glycolysis and amino acid synthesis under As stress, possessed resistant and removal ability to As. The biofilm in SRBR was characterized by FTIR, XPS, XRD, EEM, and SEM-EDS. XPS and XRD spectra indicate the formation of an arsenic species (As(V)) from arsenic oxidation. Humic acid complex arsenic (HA-As) and arsenopyrite-like phase (Fe-As-S) precipitation were formed in SRBR. Microbial arsenic oxidation was coupled sulfate reduction and biostabilization of arsenic from flue gas. Arsenic in flue gas was bio-stabilized in the form of Fe-As-S and HA-As via biocomplexation of humic acids in extracellular polymeric substances (EPS), biosorption and biodeposition. These results show that the sulfate-reducing membrane biofilm reactor is achievable and open new possibilities for applying the SRBR to removal of arsenic in flue gas from sludge incineration.

Efficient removal of Hg0 in flue gas using a novel Sn-based porphyrin polymer

A Sn-based porphyrin polymer (TAPP(Sn)-FAC) synthesized in a mild condition was introduced for the Hg0 removal in flue gas. The properties characterization of materials revealed the two-dimensional sheet structure, an amorphous structure and high stability of TAPP(Sn)-FAC, and Sn was successfully incorporated into TAPP-FAC in the form of SnN. The removal performance of Hg0 under different conditions was investigated using a lab-scale fixed-bed reactor. TAPP(Sn)-FAC presented an excellent Hg0 removal efficiency from 100 °C to 250 °C, which can reach 8 mg/g of Hg0 capture capacity at 100 °C for 300 min. Besides, TAPP(Sn)-FAC had a strong sulfur and water resistance, and the presence of NO and O2 had a facilitating effect for Hg0 removal. Moreover, the existence of Sn can enhance the Hg0 adsorption and oxidation capacity of TAPP(Sn)-FAC by promoting the electron transfer process. Furthermore, TAPP(Sn)-FAC presented an excellent chemical stability, which was a promising material in the Hg0 removal in flue gas.

Layered porous carbon material derived from food residues and its application for elemental mercury adsorption in flue gas

Abating mercury emissions from coal-fired industries is of preoccupation for protecting public environmental safety and human health. Affordable and high efficiency sorbents development for Hg0 adsorption in coal-fired industry is of practical significance for commercial applications. In this work, we report a layered porous carbon (LPC) material derived from food residues for Hg0 removal in coal-fired flue gas. The LPC is with significant high surface area of 2925 m2/g and mesoporous pore structures. Micro-mesoporous ranging from 0.4 nm to 5 nm are commonly found in the LPC, which can help promote mass diffusions thus enhancing Hg0 adsorption capability. Excellent Hg0 removal performance can be observed in simulated flue gas in 150℃ with the Hg0 removal efficiency reaching to 100 %, and it remains around 100 % within 5 successive adsorption and desorption processes without any loss. Both O2 and NO contribute significantly for the Hg0 oxidization and adsorption on LPC, and the presence of NO can greatly improve sulfur resistance for LPC. The LPC shows a rapid and efficient Hg0 adsorption capability once exposing in the Hg0 containing flue gas, and the maximum Hg0 adsorption capacity is estimated to be as high as 571 mg/g, which is much higher than other reported carbon base sorbents. The LPC derived from food residues has an industrial application potential for Hg0 removal in flue gas with the advantages of low cost and excellent adsorption performances.

Investigation on mechanochemically modified calcium‐based adsorbent for flue gas HCl removal

AbstractFor purpose of reducing chlorine ions entering the wet flue gas desulfurazition (WFGD) tower to realize the WFGD waste water sequestration and the gypsum upgrading, a technical method of adsorbent injection into flue gas to remove HCl was proposed in this work. A new NaOH‐modified CaO (CA‐MC‐NA) was prepared by the mechanochemical ball milling method as a superior adsorbent for HCl removal in flue gas. The influence of particle size and Na doping on the dechlorination efficiency and chlorine capacity was investigated in a fixed bed reaction system. The experimental results demonstrated that the HCl removal performance is improved significantly under proper particle size and Na doping, as manifested by the experiment results that the chlorine capacity increases from 27.18 to 38.36 mg/g by simple mechanical ball milling, while it surprisingly reaches 75.36 mg/g by doping 5 wt.% NaOH. The surface physicochemical characteristics was explored by combined sample characterization of BET, XRD, SEM, elemental mapping, and particle size distribution. Dechlorination mechanism of the adsorbents were deduced and discussed. It shows that the mechanical ball milling process reduces the particle sizes to the submicron scale that induces the break and reconstruction of molecular interfacial bonds. It also increases the oxygen defects on the adsorbent surface. The doping of NaOH does not change the crystal structure of the dechlorinator, and Na ions can be chemically loaded over CaO in the form of ionic bonds. Free oxygen atoms or adsorbed oxygen molecules could combine with dissociated hydrogen atoms thus forming hydroxide radicals, which enhances the alkalinity of the adsorbent and boosts the removal of hydrogen chloride.

Lead removal in flue gas from sludge incineration by denitrification: Insights from metagenomics and metaproteomics.

Flue gas lead emission during sludge incineration damages to human health and ecological environment seriously. Therefore, a denitrifying bio-trickling filter (DNBTF) for lead removal in flue gas from sludge incineration was investigated. Lead removal efficiency was up to 90.7% in 60 days' operation. Lead speciation in biofilms of DNBTF consists of 84.27% residue lead, 15.18% organic bound lead, and less than 1% exchangeable and reducible lead. Lead resistant bacteria and lead resistant-denitrifying bacteria accounted for 85.04%and 58.25%, respectively. Lead resistant microorganisms(Pseudomonas, Azoarcus, Stappia, Pararhodobacter, Paracoccus, Azospirillum, Hyphomonas, Rhodobacter, Polymorphum, Brevunimonas, Stenotrophomonas) could resist the toxicity of Pb2+ in flue gas by transport protein and binding protein, and detoxify Pb2+ in flue gas by extracellular polymeric substances (EPS) adsorption, protein binding and precipitation under the action of resistance genes, such as pbrAB, golT, troABCD, znuABC, czcABCD, pcoB, copA, as shown by integrated metagenomic and metaproteomic analyses. The biofilm was characterized by FTIR, XRD, 3D-EEM, and SEM-EDS. XRD and SEM-EDS spectra indicated the formation of pyromorphite from bioconversion of lead in flue gas. Lead-containing flue gas was bio-stabilized in the form of pyromorphite and HA-Pb via complexation of humic acids in extracellular polymeric substances (EPS), biosorption and biodeposition. This provides a new way of sludge incineration flue gas lead removal using a denitrifying biotricking filter.

Numerical study on the distribution of flue gas residence time in the desulfurization and denitrification system by the optimization of the model

Abstract During the operation of the CSCR activated carbon desulfurization and denitrification flue gas purification system, due to the unreasonable design of flue gas pipe diameter and the uneven distribution of activated carbon porosity, the uniformity of flue gas distribution is prone to problems, which affects flue gas removal efficiency and increases operating costs. In this article, the Fluent software was used to establish a three-dimensional numerical model of the flue gas purification system, and the flow characteristics of the flue gas were studied by continuously optimizing the structure of the system model. The effects of different pipe diameters, the accumulation method of activated carbon in the desulfurization and denitration module and the distribution of porosity on the flue gas are analyzed, and the effects on the average residence time and variance of flue gas were further analyzed. The results show that the average residence time, the variance, the dead volume fraction, and well-mixed volume decreased, while the dispersed plug volume fraction increased for a module after optimization. The average residence time and the dispersed plug volume fraction decreased. While the variance, the dead volume fraction, and well-mixed volume fraction increased for the system after optimization.

Enhanced generation of hydroxyl radicals by OMS-2 catalyst for flue gas absorption

The successful removal of flue gas by the usage of highly stable OMS-2 nanoparticle have been studied in this work. Flue gas has the main component that is SOx and NOx which are considered hazardous gas it not only harms the environment but also badly affects human health. To alleviate the impact of SOx and NOx on the environment we suppose to use OMS-2 catalyst with Ozone. However, ozonation alone is not sufficient for simultaneous oxidation of SOx and NOx. Therefore, the most immediate requirement of this process is to enhance the hydroxyl radical generation that would decrease the overall ozone demand and rapid degradation of the pollutants. This would make the process more viable for commercial usage. In this work, the authors have tried to use as-synthesized octahedral molecular sieves (OMS-2) as the catalyst for the rapid generation of hydroxyl radicals in the ozonation process. Several studies have been reported in the past years for the integration of the ozonation process and the existing methods for the simultaneous treatment of SO2 and NO2. NO2 shows a high reactivity in ozonated water and the %conversion for the same was more than 85%. SO2 shows poor reactivity towards the ozonation process with a maximum conversion of 60%. However, it was observed that the addition of OMS-2 makes noticeable changes for both SO2 and NO2 %conversion. The catalyst enhances the •OH radical generation, and NO2&SO2% absorption reaches 88% and 97% respectively. The mechanism of generation of various reactive species by O3 and OMS-2 catalyst has been described in addition to that, it has been tried to optimize the usage of the OMS-2 catalyst and other operating parameters in this work.

Flue Gas Removal Systems Are a Key Issue in the Application of Condensing Boilers

This article is devoted to the most pressing issue of the use of condensing boilers in Russia for autonomous heat supply systems - the organization of smoke removal. If we compare a standard gas boiler with its condensing counterpart, then we can come to the conclusion that their differences lie not only in some innovations, but in radically different principles of operation. Yes, in both cases, the heating of the coolant occurs due to the combustion of the gas, but in the condensing boiler, the heating of the coolant is additionally performed with the help of exhaust gases. Moreover, the smoke removal system in this case produces the primary heating of the liquid - the exhaust gases, which contain a large amount of water vapor, first heat the coolant, and only then directly the gas heats it up to the specified temperature. It is thanks to all this that fuel savings occur - the efficiency of condensing boilers is 15-20% higher compared to standard units of this type. The set of domestic directives and regulations on autonomous heat supply in individual issues, focusing on foreign developments, at the same time has significant features in the requirements for the design and operating conditions of combustion products removal systems, especially for condensing boilers.

The CO2 removal of flue gas using hollow fiber membrane contactor: a comprehensive modeling and new perspectives

In this study, a novel hollow fiber membrane contactor (HFMC) under a non-wet condition was numerically explored by CFD techniques based on the finite element method to capture CO2 from the CH4/CO2 gas mixture. A new design, such as a shell and tube heat exchanger with baffles, was proposed. The MEA, DEA, and TEA, as different amines solutions, were selected as the liquid solvents. A CO2-containing gas mixture and amine solution were passed in the shell side and the tube side of the membrane contactor, respectively. The simulation findings indicated a good agreement with the reported experimental data demonstrating that such a model would evaluate the effects of different parameters during the HFMC system. Specifically, the results showed that the baffles' presence improved the separation efficiency due to the increased residence time on the shell side. The results also indicated that the MEA solution had the highest CO2 absorption. In the new design (shell and tube heat exchanger with baffles), the rising solvent inlet velocity, decreasing gas velocity, and counter-current flow pattern positively affected separation efficiency.

Insights into the Mechanism of Elemental Mercury Adsorption on Graphitic Carbon Nitride: A Density Functional Theory Study

Recently, graphitic carbon nitride (g-C3N4) has been proven to be a novel and effective carbon-based adsorbent for elemental mercury (Hg0) removal in flue gas due to its peculiar π-conjugated electronic structure and chemical and thermal stability. However, the active sites and detailed reaction pathways occurring on the g-C3N4 surface are still unknown. Here, g-C3N4 nanoplates with abundant active edge sites (surface defects) are successfully prepared via a thermal polymerization method, which display good Hg0 adsorption ability. The adsorption behavior of Hg0 over g-C3N4 is further studied using quantum chemistry calculations based on density functional theory (DFT), aiming at gaining a better understanding of the Hg0 adsorption structures and bonding mechanisms on the g-C3N4 surface at the atomic level. The calculation results show that the adsorption of Hg0 on intact g-C3N4 surfaces is poor due to the stable chemical structure of intact g-C3N4 and lack of active electron orbitals. In contrast, g-C3N4 with surface defects, i.e., exposed C or N sites, possesses enhanced Hg0 adsorption ability probably owing to the unsaturated coordination bond environment and the formation of chemical bonds with mercury atoms at the defective sites. The location of defects also has a big influence on the mercury capture ability of g-C3N4. The exposed surface nitrogen is more favorable for mercury capture than the exposed surface carbon.

Simultaneous removal of carbon dioxide, sulfur dioxide and nitric oxide in a biofilter system: Optimization operating conditions, removal efficiency and bacterial community

Anthropogenic NOx, SO2 and CO2 emission from the fossil-fuel-fired power plants has aroused growing attention. This study investigated the removal performance of CO2, SO2 and NOx in flue gas as well as conversion efficiency of nitric- and sulfur-compounds in liquid phase in a biofilter. In order to develop the potential of the biofilter, simulative industry wastewater was employed as the spray solution. The satisfactory flue gas removal performance (75.23% CO2, 100% SO2 and 82.81% NO) were achieved under the optimal operating conditions of biofilter: initial solution pH of 9 and liquid-gas ratio (L/G) of 3. The gas film mass transfer coefficients (kGa) results showed that the resistance of gas mass transfer was decreased with increasing the pH value and L/G ratio, respectively. The final transformation product of NO was mostly N2 while about 78% SO2 was converted to elemental sulfur. The microbial community analysis results showed that the relative abundance of bacteria with denitrification capacity was increased by 3.05% which might have contributed to the conversion of NO intermediates products in present study. Collectively, this biofilter system achieve a better flue gas removal performance via the proper operation system, which provides an economic feasible strategy of flue gas purification and increases potential for industrial application.

Highly efficient sorption and immobilization of gaseous arsenic from flue gas on MnO2/attapulgite composite with low secondary leaching risks

Some sorbents have been developed for arsenic (As) compounds capture from flue gas . However, most of the conventional sorbents have cost constraints and can cause secondary pollution due to the leaching of arsenic after use. To solve this problem, a new and highly efficient adsorbent for gaseous arsenic was successfully developed in this paper with excellent immobilization performance and low-cost. A series of Mn-supported attapulgite (ATP) composites were fabricated, characterized, and investigated for arsenic capture. The modification of ATP with Mn not only considerably enhanced the adsorption efficiency but also stabilized the adsorbed As in the spent sorbents. SO 2 in flue gas promoted the adsorption performance through As-sulfate binding, whereas NO was beneficial for the oxidation of As(III) to As(V) on the surface of Mn-modified ATP. The incorporation of Mn with ATP generated abundant hydroxylate (OH − ) from hydration and accelerated the formation of As-sulfate compounds, which was beneficial for physical encapsulation . The results of the toxicity characteristic leaching procedure and sequential extraction test revealed that adsorbed As could be considerably immobilized by the sorbent with low leaching ability. Mn modification changed more As into inert fractions and consequently inhibited release from spent sorbents, which considerably reduced the risks of secondary pollution. The developed composite can be potentially used as a new efficient sorbent for gaseous arsenic capture in flue gas. • Manganese modification effectively enhanced the capacity of ATP for gaseous arsenic removal in flue gas. • Trivalent arsenic was oxidized into pentavalent arsenic during the process. • Manganese oxides facilitated the transformation of adsorbed-arsenic on Mn-ATP from leachable fraction to inert fraction.