Dust Suppression Research Articles

Study on dust pollution law and chemical dust suppression technology of non hard pavement in urban construction sites

Dust pollution has been a serious problem for the construction industry. Wind currents inevitably kick up dust on the ground during construction. Dust will not only affect the physical and mental health of construction workers, but also pollute the environment. In this paper, the law of dust generation and diffusion in typical construction sites is simulated and analyzed. According to the simulation, the wind flow lasts for 5s–10s, and the dust concentration in the air reaches more than 50 mg/m3 in the daily environment. In order to control dust pollution, a kind of "green environmental protection" dust suppressor suitable for construction site was developed by using grafting polymerization technology in molecular modification technology. By means of performance characterization, the synthetic ingredients of dust suppressor were determined as 2.5g sodium alginate, 5g acrylamide, 0.15 g N,N ′-methylene bisacrylamide, and the mass ratio of ammonium persulfate to acrylamide was 3%. The optimum temperature for synthesis of dust suppressor was 60 °C. The synthesized dust suppressor can still retain more than 80% moisture after 90min of oven drying at 45 °C, which indicates that the water retention is good. Under the ambient wind speed of 12 m/s, the wind erosion resistance rate is above 99%, which indicates that it has fine anti-wind erosion performance. According to the results of dust suppression experiment, the synthesized dust suppression agent can control the dust in the construction site well.

Study on Multi-Factor Optimization and Application for Water Mist of a Wetting Dust Suppressant.

Aiming at the problem of low efficiency of capturing respirable and hydrophobic dust in water mist dust removal technology, a chemical dust suppression method is adopted. Based on the research idea of improving the wetting efficiency of water mist, prolonging the droplet retention time, and improving the contact opportunity with dust, the experiments of dust sedimentation time, solution spreading area, and water loss rate are selected to evaluate the wetting efficiency and anti-evaporation performance of dust suppression water mist. Considering the special double-chain structure of the Gemini surfactant and its high wettability, it is preferred as the main dust suppression component. Based on the indoor experimental data, the optimized formula of the composite wet water mist dust suppressant was obtained by CCD-RSM(central composite design-response surface methodology). The comparison of indoor experimental data shows that the sedimentation time of the dust sample in the water mist dust suppressant is 5.0 times faster than that of pure water, the spreading area of the dust suppressant solution is 1.8 times that of pure water, and the water loss rate of the dust sample treated by the dust suppressant is 70% that of pure water. The field investigation results show that compared with pure water mist, the dust removal rates of the Gemini wetting dust suppressant for respirable dust and total dust are 90.3 and 71.1%, respectively, which are 10.5 and 22.5% higher than that of pure water mist. It can be proved that improving the wetting efficiency and anti-evaporation performance of spray mist will increase the dust removal efficiency.

Suppression Characteristics and Mechanism of Molasses Solution on Coal Dust: A Low-Cost and Environment-Friendly Suppression Method in Coal Mines

Coal dust pollution poses a serious public health threat. This study aimed to investigate the feasibility of creating a coal dust suppressant using molasses, a byproduct of the sugar industry. We studied the effects of a molasses solution of varying concentrations (i.e., ranging from 0% (pure water) to 40%) on the moisture, bonding, and wind erosion properties of coal dust. Overall, the effectiveness of the molasses increased with their concentration, and it manifested itself in the following way: (1) the molasses improved the anti-evaporation ability of wet coal dust. For example, the evaporation mass of the coal dust wetted using a molasses solution decreased by 82.8%; (2) molasses effectively agglutinated coal dust; (3) molasses can effectively decrease the surface tension and increase the viscosity of the wetting solution. The surface tension of the molasses solution reached 41.37 mN/m and the viscosity increased to 6.79 mPa·s; (4) molasses can significantly suppress the wind erosion of deposited coal dust, with its wind erosion mass decreasing 99.1%; finally, (5) the effectiveness of molasses at suppressing coal dust was discussed at a molecular level. This study highlights the feasibility of a low-cost and environment-friendly dust suppressant in coal mines.

Spreading Behavior and Wetting Characteristics of Anionic Surfactant Droplets Impacting Bituminous Coal.

Spraying water-based materials on the coal surface is a common means of coal dust suppression. There are obvious dynamic wetting behaviors during droplets impacting coal. To explore the spreading behavior and wetting characteristics of anionic surfactant droplets on bituminous coal, three anionic surfactants, which are sodium dodecyl sulfate (SDS), sodium dodecyl sulfonate (SDDS), and sodium dodecyl benzene sulfonate (SDBS), were used for the droplet impact experiment and molecular dynamics (MD) simulation. The results show that the addition of anionic surfactants can promote the wetting behavior of the droplet, and the difference between the head group and the tail group of the surfactant molecules can affect the wettability of the droplet. The dimensionless spreading coefficient shows the rule of SDBS > SDS > SDDS. When the concentration does not reach critical micelle concentration (CMC), the surface tension decreases and the dimensionless spreading coefficient of droplets increases with the increase of concentration. When the droplet concentration reaches the CMC, surface tension is no longer an effective indicator to evaluate the wettability of droplets. The dimensionless spreading coefficient can effectively evaluate the macroscopic spreading wetting behavior of droplets, and it is better than the surface tension. MD simulation results show that the interaction between anionic surfactants and coal molecules can affect the adsorption behavior, and the interaction energy and adhesion work are shown as the rule of SDBS < SDS < SDDS. The results of MD simulation and the impact experiment show that the intermolecular adsorption behavior has a significant influence on the spreading process. The results of MD simulation further explain the results of the droplet impact experiment.

A multiphase data fusion approach based on CFD-DEM for gas–solid flow simulation in PDSS

In order to improve the operating environment of the bulk material transfer system and promote the digital construction of such systems, a new multiphase data fusion method is proposed for simulation of dust suppression in the digital twin system. It is applied to the multiphase flow motion simulation in a new Powerless Dust Suppression System (PDSS), and the results show that the method based on Discrete Element Methods (DEM) and Computational Fluid Dynamics (CFD) can well calculate the interaction between air and bulk material. A stable vortex airflow field can be generated in the structure of the PDSS, and the speed difference between the inlet and the exit of transfer chute is almost 0%, which can effectively bind the fine coal dust particles and prevent dust diffusion. In the structure where the curtain is arranged, a part of the vortex airflow will flow back after the action of the curtain, the backflow air can further reduce the speed of the airflow, and the dust-laden airflow has more time to contact the curtain and the material to cause sedimentation, which can further prevent dust emission. This study provides a practical reference for the design of transfer dispatching station and other similar particle–fluid digital twin systems.

A coupled discrete-finite element model for bulk materials transfer simulation and PDSS structural wear prediction

The transfer dispatch of bulk materials has been widely used in industrial and agricultural production. When applied to energy extraction and utilization, the interaction of bulk with structures causes problems such as structural wear and dust pollution during the transfer dispatch process. To address the difficulty of dynamic data collecting and monitoring in this process, a multiphase data fusion simulation approach for discrete material transfer dispatch of the digital twin system is proposed. Discrete Element Method (DEM) is used to obtain the movement of bulk material in the Powerless Dust Suppression System (PDSS) structure and its force data on the structure. With this method, this force data is loaded onto the structure for calculation based on Finite Element Method (FEM) more accurately compared to the traditional method. Under the experimental conditions, the maximum stress and strain in the PDSS structure are 34 MPa and 1.55 mm. Moreover, the numerical distribution of stress and strain is relatively continuous, and there is no sudden strong impact. The results show that the method can provide an effective solution to analyze the interaction between the bulk and the structure, and can assist in predicting the structure wear and managing the operating environment in the digital twin system.

Molecular dynamics simulation of interface adhesion characteristics between dust suppressant and coal

In the process of coal mining, storage, and transportation, the escape of coal dust restricts the development of various aspects in China, such as environmental pollution, economic loss, and pneumoconiosis. In the present work, molecular dynamics (MD) simulations were used to study the adhesion of dust suppressants to coal molecules. Firstly, the adhesion property of the interface between dust suppressant and coal was studied by calculating the interaction energy and adhesion work of the interface. The dynamic simulation results show that the adhesion between dust suppressant and coal surface is spontaneous, the non-bond interaction plays a key role in this phenomenon, and the electrostatic interaction energy is the main contribution of non-bond energy. In addition, the distribution of dust suppressants on coal surfaces is also analyzed. These analyses contribute to the development of new adhesion dust suppressant materials to solve the problem of coal dust secondary pollution in mining areas. • Atomistic modeling was used to study the adhesive characteristics of dust suppressant • Non-bonded interaction is the key factor of interfacial bonding. • The choice of interface contact area will result in different adhesion work

Effect of different types of surfactants adsorption characteristics on the wettability of coking coal dust

To investigate the effect of different types of surfactants adsorption characteristics on the wettability of coking coal dust, Guoyang coking coal and three different surfactants - dodecyl dimethyl benzyl ammonium chloride (DDBAC), sodium alcohol ether sulphate (AES), coconut diethanolamide (CDEA) - were used. Firstly, the amount of surfactant adsorbed on coal dust were determined using spectrophotometry. Secondly, the contact angles of surfactants on coal tablets was determined. Subsequently, the relationship between the amount of surfactant adsorbed on the coal dust surface and the contact angle was analysed. Finally, the influence mechanism of the amount of the surfactant adsorbed on the coking coal dust surface on wettability was discussed. The experimental results suggest that the adsorption isotherm of cationic surfactant DDBAC on the coal dust surface is bilayer LS-type, while the adsorption isotherm of anionic surfactant AES and non-ionic surfactant CDEA are L-type and S-type, respectively. Additionally, when the concentration of the solution was 0.05%, the amount of AES adsorbed on the coking coal dust surface was estimated to be 64.9 mgg−1, which was 4.19-fold higher than DDBAC (i.e. to 15.5 mgg−1) and 2.2-fold higher than CDEA (i.e. to 29.5 mgg−1), nearly reaching adsorption saturation. The R2 of the amount of DDBAC, AES, and CDEA adsorbed on the coal dust surface affecting the contact angle was 0.9944, 0.99238, and 0.9923, respectively. The adsorption amount of anionic surfactant AES on the coal dust surface at 0.05% is 64.9 mgg−1, and the adsorption isotherm of surfactant on the coal dust surface is L-type, which is more conducive to enhancing the wettability of coking coal dust. Thus, the amount and adsorption isotherm form of the surfactant adsorbed on the coal dust surface are critical factors affecting the coal dust wettability, which provides a theoretical basis for the reasonable selection of surfactants to improve the coal dust suppression efficiency.

Effect of ventilation parameters on dust pollution characteristic of drilling operation in a metro tunnel

Dust pollution generated from metro construction can cause serious pneumoconiosis in workers. To efficiently relieve dust pollution in personnel breathing zones during drilling operations, this study applied a numerical simulation of a metro tunnel to analyze the effects of ventilation parameters (supply airflow volume and distance of forced air duct outlet from driving face) on the distribution behaviors of airflow velocity and dust concentrations. Sixteen ventilation conditions were designed to determine dust pollution characteristics in four personnel breathing zones, and optimal dimensionless ventilation parameters corresponding to efficient dust suppression performance were determined. The numerical simulation results indicated that each supply airflow volume corresponded to an optimal installation position of the forced air duct outlet. Without considering advancement of the driving face, the optimal dimensionless distance of the forced air duct outlet from the driving face (ratio of the distance of the forced air duct outlet from the driving face to the equivalent diameter of the excavated section) was 3.125 and 3.906 when the dimensionless supply airflow volume (ratio of supply airflow volume to the minimum supply airflow volume corresponding to the average section airflow velocity of 0.15 m/s) were 1.002–1.336 and 1.671–2.005, respectively. However, the recommended dimensionless distance of a forced air duct outlet from a driving face should not be 5.469 when the dimensionless supply airflow volume is 1.002–2.005. Considering a 5–10 m advancement of the driving face, the optimal dimensionless distance of the forced air duct outlet from the driving face was 3.125 when the dimensionless supply airflow volume was 1.002–2.005. The accuracy of the numerical simulation results was validated in field measurements.

Effectiveness of Food Processing By-Products as Dust Suppressants for Exposed Mine Soils: Results from Laboratory Experiments and Field Trials

In this study, the effectiveness of biodegradable food processing by-products (chicory vinasses, corn steep liquor, decantation syrup, and palatinose molasses) as dust suppressants on mine soils has been precisely quantified using controlled laboratory experiments and field trials. Laboratory experiments using a wind tunnel indicate that rainfall intensity and repetitive wetting and drying cycles affect the by-products’ effectiveness. In addition, field trials conducted using soil plots at an open-pit lignite mine (Germany) demonstrate that the tested biomaterials can effectively reduce dust emissions under field conditions, despite the fact that rainfall led to the leaching of the applied biomaterials, decreasing the additives’ concentrations on the soil surface and impairing the materials’ effectiveness to suppress wind erosion. Thus, food processing by-products may be used for short-term dust mitigation at mine sites and represent environmentally benign alternatives to dust control chemicals detrimental to the environment.

Dust Dispersion Characteristics of Open Stockpiles and the Scale of Dust Suppression Shed

The storage of bulk materials in open yards can easily lead to contamination in the form of suspended particles. The creation of enclosed spaces for open yards is an effective measure to stop the dispersion of dust to the outside. In this study, a reliable numerical model was developed to calculate the impact range of dust dispersion using the concentration–velocity distribution of pollutants based on the DPM-CFD simulation, and validated by field measurement data. Then, the hazard distance was defined as the basis for determining the boundary of the closed shed. Finally, we determined the dimensions of the boundaries by a comprehensive analysis of the structure and materials of the closed shed. Our results demonstrated that the most unfavorable wind speed determines the maximum concentration of dust at a height of 1.5 m. As a result, hazard distance thresholds are obtained to be 63.5 m and then the shed boundary dimensions are calculated to be 127 m. Our studies can provide some theoretical basis for the construction of closed sheds in field yards.

Review and prospects of mining chemical dust suppressant: classification and mechanisms.

Coal mine pollution is a serious threat to the mine safe production and occupational health of miners. Chemical dust suppression can effectively reduce the concentration of coal dust and suppress the re-entrainment of dust. This paper discusses the research progress of three kinds of traditional dust suppressants: the wetting-type, cohesive type, and condensed type. In order to meet dust suppression and environmental protection requirements, 7 kinds of new type dust suppressants, such as compound, ecological environmental protection, polymer, functional, microbes, and enzymes, have been developed by the predecessors. And all kinds of dust suppressant mechanism and main performance index have been summarized. Through the analysis of the research results from 1985 to 2021, it is found that the compound and environment-friendly dust suppressants have gradually become the research focus in this field, accounting for 17.93% and 26.21% of the total number of achievements. In the recent 5years, new materials, such as microbe suppressant, urease suppressant, and nanomaterials, have gradually emerged. Because of their natural and environmental protection characteristics, it could be predicted that they will become the future development trend in this field. However, there are still some problems to be improved, such as expensive price and complex preparation technology.

Humidification mechanism of porous adsorbent on asphalt concrete

In this study, the asphalt mixture has the function of active humidifying and dust suppression by adding adsorbent to its surface. By means of scanning electron microscope, physical adsorption and other micro analysis methods, from the perspective of micro morphology, adsorption structure and surface wettability of the adsorption asphalt mixture, the micro adsorption characteristics of the porous adsorbent (Natural zeolite powder, 13X molecular sieve) at different dosage of asphalt mixture are obtained by taking the growth rate of adsorption area and adsorption pore volume as evaluation indicators, 100% 13X molecular sieve can increase 94.57% adsorption area and 79.58% adsorption pore volume. Combined with the macro humidifying and dust suppression test, the influence of adsorbent on the humidifying and dust suppression of asphalt mixture is analyzed. The results show that the addition of porous adsorbent increases the adsorption area and adsorption pore volume of asphalt mixture, enhances its water retention and dust suppression ability, and the dust suppression effect is strongly related to the increase of adsorption surface area and adsorption pore volume, the inhibition time of PM10 concentration can reach 1.5 times of that of ordinary asphalt mixture.

Analysis of the effects of rainfall on production performance of a surface mine in Ghana

Monthly production rates of most surface mines fluctuate with season and the Nzema Gold Mine is no exception. Located in the western region of Ghana, which is considered the wettest part of the country, the monthly production rates of the mine fluctuate with rainfall. Data covering three years were obtained from the mine and subjected to some statistical analyses including regression analysis and t-test. Using regression analysis, the production data were regressed on the rainfall records to establish a coefficient of determination (R2) and also to observe the general trend between the two variables. The obtained coefficient of determination was further scrutinized with a t-test to prove the existence of a linear correlation between rainfall and production. The results obtained show that there is no linear correlation between rainfall and production in the Nzema Gold Mine. Nevertheless, the presence of rainfall in the mine has an impact on production values, preventing the mine from meeting its desired production targets. From the results, rainfall comes third place on the hierarchy of general delays with a percentage contribution of 13% and causes an average loss of about 4,145 Bank Cubic Metre (BCM) worth of material annually. The presence of rainfall also introduces some benefits as well as deprivations to the mine, causing an average of about $243,000 worth of fuel to be saved concerning the water dust suppression activities, and an average of about $273,000 worth of fuel to be lost on dewatering pumps.

Effectiveness of coal mine dust control: A new technique for preparation and efficacy of self-adaptive microcapsule suppressant

This study aims to make full use of the agricultural waste peanut shells to lower material costs and achieve cleaner production at the same time. Cellulose nanofibrils (CNF) extracted from peanut shells were mixed with acrylic acid (AA) and dimethyl diallyl ammonium chloride (DMDAAC) to prepare a new type of capsule core (dust suppressant). Then, the self-adaptive AA-DM-CNF/CA microcapsules were prepared under the action of calcium alginate. The infrared spectroscopy and X-ray diffraction analysis results suggest that AA, DMDAAC and CNF have experienced graft copolymerization which leads to the formation of an amorphous structure. The scanning electron microscopy analysis results demonstrate that the internal dust suppressant can expand and break the wall after absorbing water, featuring a self-adaptive function. Meanwhile, the laser particle size analysis results show that the microcapsules, inside which the encapsulated dust suppressant can be observed clearly, maintain a good shape. The product performance experimental results reveal that the capsule core and the capsule wall achieve synergistic dust suppression, thus lengthening the dust suppression time. The product boasts good dust suppression, weather resistance, degradation and synergistic combustion performances. Moreover, this study, as the first report on the development and analysis of dust-suppressing microcapsules, fills in the research gap on the reaction mechanism between dust-suppressing microcapsules and coal by MS simulation. The proposed AA-DM-CNF/CA dust-suppressing microcapsules can effectively lower the dust concentration in the space and protect the physical and mental health of coal workers. In general, this research provides a new insight into the structure control and performance enhancement of dust suppressants. Expanding the application range of microcapsules is of crucial economic and social benefits.

Study on the combined dust suppression effect of sodium alginate and sodium fatty acid methyl ester sulfonate

• In-depth study of coal dust wetting mechanism. • Application of molecular dynamics simulation in dust suppressants. • Study on the mechanism of dust suppression by combining different surfactants. To further improve the effect of dust control in coal mines and protect the health of workers, the effect of sodium alginate (SA) on the dust suppression ability of sodium methyl ester sulfonate (MES) was studied using molecular dynamics simulation. Scanning electron microscopy and X-ray photoelectron spectroscopy analyses were performed to compare the dust suppression effect of the SA/MES dust suppressant compound to MES by itself. The results show that when SA is present, the coal dust bonds together more, agglomerates into large particles, and settles. This finding is also consistent with the results of molecular dynamics simulations. In the analysis of relative concentrations and mean square displacement, the presence of SA can reduce the water diffusion on the coal surface, making it easier for coal dust to agglomerate. In addition, we analyzed the mode of action of SA through radial distribution and electrostatic potential, and determined that SA forms a unique networking chain structure to capture and retain water molecules. SA increases the probability of interaction between water and surfactant, thus increasing the amount of adsorption. This study provides a more in-depth understanding of the dust suppression mechanism of mixed dust suppressants.

EFFORTS IN CONTROLLING COAL DUST HAZARDS IN THE STOCKPILE AREA OF A STEAM POWER PLANT (PLTU)

Background: The movement of coal or other activities in the stockpile area of a steam power plant can create a coal dust hazard or commonly referred to as respirable dust. The smaller the particle size, the more harmful effects it can have on human health, such as bronchitis, decreased lung function, Chronic Obstructive Pulmonary Disease (COPD), Coal Worker's Pneumoconiosis (CWP), and other respiratory diseases. Purpose: To study the chemical hazards of the working environment of coal dust and the control efforts conducted in the stockpile area of a steam power plant company. Method: This research was descriptive observational with a cross-sectional study. The data were comprised of primary data collected from interviews and observations, and secondary data such as environmental measurement report and documentations owned by company. Result: The results of the measurement of coal dust hazard in the stockpile are were 0.007 mg/m3 and 0.063 mg/m3 for personal dust measurements. Some of the coal-dust-hazard control efforts performed by PT. POMI included the installation of a spray gun, a dust suppression system, reforestation, and ventilation setting. Further, OHS induction was conducted, together with safety talk, working hour regulations, toolbox meeting, training on the use of PPE, Medical Check Up (MCU), person authorization, preventive maintenance, and the use of PPE by workers. Conclusion: The measurement of the coal dust hazard in the stockpile area is below the threshold value which is 3 mg/m3 for respirable particles and 10 mg/m3 for inhalable particles. PT. POMI has done several preventive and control efforts towards coal dust hazard, and there were no health problems found in workers.

IoT-based Automatic Dust Monitoring and Suppression System for Coal Warehouses and Processing Areas with a Reduction in Water Consumption

Dust is a serious problem at coal warehouses and processing areas of coal mines in Vietnam. At present, almost coal mines use high pressure mist machines to suppress dust. Several coal mines build fixed mist spray systems for dust suppression. These systems are manually controlled. This could lead to use too much water for suppressing dust and affect negatively coal quality. IoT is a new technology and applied to various fields such as smart home, smart city, smart agriculture, smart retail, smart health as well as in industry etc. This article presents a new IoT model for automatically monitoring and suppressing dust with a reduction in water consumption. Specially, the proposed model not only automatically monitoring dust density and warning when it is greater than the limit value but also automatically adjust open angle of water valve to save water according to the measured dust density.The simulation results demonstrate that the proposed model stably operates and uses less water for suppressing dust. In addition, the system allows to automatically/manually turn on/off the water pump as well as water valve according to the dust density. This will save more water and even energy. Furthermore, in order to protect sensor data when transmitted over wifi network, we use WPA wifi security protocol, and to reduce effects of noise, Kalman filter is applied to the proposed system.

Research on wet-type swirl dust collection technology and its application in underground excavation tunnels

Wet-type dust collectors are widely used in underground excavation tunnels to control dust pollution. Nozzles and filter screens easily blocked by deposited scale and sticky dust, however, are usually a challenging problem for traditional wet-type dust collectors. This increases the cleaning workload and reduces the service life of the equipment. To address this issue, a wet-type swirl dust collection method without using spray nozzles and filter screens is proposed, and a novel wet-type swirl dust collector is designed. Experiments and field application of the wet-type swirl dust collector were carried out. Experimental results showed that the optimum water intake of the dust collector was 1.0 m3/h at 1480 r/min−1 impeller speed; the dust suppression efficiency of the dust with particles size less than 75 μm was 93%, and that of dust with particles size of 180–250 μm was 95.2%. The field application in China's Tongqing Mine indicated that the respirable dust at the roadheader driver was reduced to 6.9 mg/m3, with a dust removal rate of 92.0%. The wet-type swirl dust collector effectively improves the dust collection efficiency and makes up for the problem of nozzles and filter screens being easily blocked in underground excavation tunnels by the traditional methods.

Biochar granulation reduces substrate erosion on green roofs

Green roofs are exposed to high winds and harsh environmental conditions that can degrade vegetation and erode substrate material, with negative consequences to ecosystem services. Biochar has been promoted as an effective substrate additive to enhance plant performance, but unprocessed biochars are susceptible to wind and water erosion. Applications of granulated biochars or chemical dust suppressants are suggested as a means to mitigate biochar and substrate erosion; however, research on biochar type and chemical dust suppressant use on biochar and substrate erosion is lacking. Vegetation is a crucial factor that influences substrate erosion, yet plant responses may vary with biochar type and chemical dust suppressant; thus, the effects of possible mitigation measures on biochar and substrate erosion are unclear. We investigated the effects of surface-applied granulated and unprocessed biochars and an organic dust suppressant (Entac™) on biochar and substrate erosion on green roofs with Sedum album L. and a native plant mix. Our results show that 94% of unprocessed biochars were lost from green roofs after 2 years regardless of the Entac™ amendment, likely due to the lightweight nature and fragmentation of biochar particles. In contrast, granulation of biochars reduced the biochar erosion and total substrate erosion by 74% and 39%, respectively, possibly due to enhanced biochar bulk density and particle size and improved moisture retention of biochar-amended substrates. Additionally, Sedum album better reduced biochar and substrate erosion than the native plant mix, likely due to rapid development of high vegetation cover that reduced wind exposure and enhanced substrate moisture retention. We conclude that applications of granulated biochars can substantially reduce biochar and substrate erosion on green roofs, improving green roof sustainability.Graphical