Addition Of Dust Research Articles

Industrial applications of sol-gel derived coatings.

Sol-gel derived coatings have many practical applications in different industries. In this paper, HI-GARD® hard coat, multi-layer antireflective coatings, and an anti-glare coating with organic particles are described. Optical and mechanical performances of these coatings are discussed in addition to adhesion properties. The HI-GARD® hard coat was dip or spin coated from a sol by hydrolyzing alkoxysilanes with water in an acidic condition. The hard coat acts as a protective coating for optical lenses with excellent optical properties with a Bayer ratio of 4.8 and an adhesion of 5B. The multi-layer antireflective coatings were prepared by incorporating titanium oxide sol into the HI-GARD® hard coat solution to obtain different layers by spin-coating with tunable refractive index. These two-layer or three-layer antireflective coatings increase transmittance by at least 3% compared to an uncoated glass substrate. Anti-glare coatings were spray-coated at room temperature on glass substrates by embedding cationic or anionic polystyrene particles in an acid-hydrolyzed silane sol. The anti-glare coating with organic particles can provide a significant glare reduction with a haze value of up to 13% for display surface without sparkling. In addition to these transparent coatings, non-transparent sol-gel derived coatings such as a sol-gel non-stick coating for cookware and bakeware, and two zinc-silicate protective coatings hydrolyzed from a silane with addition of zinc dusts for corrosion protection are also discussed briefly. The schematic structures of the hard coat on CR-39® substrate, three-layer AR coatings on glass substrate, and organic particle embedded anti-glare coatings on glass substrate, and their respective transmittance or reflective curves.

Surface Dust Redistribution on Mars From Interannual Differences in Temperature and Albedo

AbstractThe present climate of Mars is punctuated by recurring dust storm events, where dust is lifted from the surface and is transported by the atmosphere. Dust addition or removal can brighten or darken the surface, as well as affect thermal insulating properties because of its low thermal conductivity. Of particular interest is the recurrence of global dust storms (GDSs) and whether their frequency is controlled by the replenishment or depletion of finite surface reservoirs between events. Global climate models predict changes in dust coverage before and after global storms, but output varies substantially regarding the amounts and locations of transported dust. The analysis of global, multiyear observations of surface temperature and albedo from orbit can constrain changes in dust coverage and/or thickness. We calculate and map interannual differences in surface temperature from Mars Year (MY) 24 through MY35 to identify regions of dust redistribution. Regional temperature changes across the MY25 GDS can be explained by changes in albedo and do not require changes in surface thermal properties, supporting extremely small dust thickness changes. Across the MY34 GDS, we find less extensive changes in surface temperature, indicating a reduced impact on dust redistribution compared to MY25. However, we identify a region between Acidalia and Arabia Terra that experienced substantial dust removal and positively correlates with visible high‐resolution orbital images. Our work supports minuscule changes in dust thickness from the observed GDSs and is consistent with effectively infinite dust reservoirs on timescales of at least 103 years.

Durability and microstructural behavior of Nano silica-marble dust concrete

Present study assesses the durability performance of concrete mix with the addition of marble dust and Nano silica as partial replacement of cement. Concrete blends with 1 %, 2 %, and 3 % Nano silica and 5 %, 10 %, and 15 % marble dust powder were prepared at constant water to binder ratio of 0.4. The bulk density, water permeability, water absorption, carbonation depth, rapid chloride penetration test, and acid attack after curing for 28 days along with mineralogical and morphological tests were carried out. The carbonation depth was investigated after exposing the samples for a long duration of 90 days and 180 days, respectively. The durability tests revealed that the incorporation of Nano silica (2 %) and marble dust (5 %) together, resulting in a decrease in water absorption and permeability up to 26 %, and 57 %, respectively. A reduction of around 20 % in carbonation depth was also observed for concrete mixes containing 2 % Nano silica and 5 % marble dust powder. Nano silica and marble dust containing concrete mixes offer good resistance to acid attack. It was observed that the incorporation of fine particles of marble dust (5 %) and Nano silica (2 %) in cement enhanced the bulk density by reducing the pores inside the matrix and thus improves the overall durability properties of the concrete mix. The utilization of nano silica and marble dust as replacement of cement in concrete can lower the CO2 emission produced during the manufacturing of cement.

Redefining of potential dust explosion risk parameters for additives in the petrochemical manufacturing process

Petrochemicals are an indispensable part of our everyday life, necessitating large-scale production facilities. Additive aids play a pivotal role in the petrochemical production process, which are required for the final product to have certain desired properties. The additives used are prone to ignition and combustion, but are frequently overlooked as a source of potential hazard. This study examines the hazard profile of five common powder additives in the petrochemical manufacturing process. The inherent combustion and explosion characteristics were investigated in detail. Each sample’s potential to produce a dust explosion was evaluated based upon the parameter test results, e.g., minimum ignition energy (MIE), minimum ignition temperature (MIT), and minimum explosible concentration (MEC). MIT of all five samples was between 350 and 390 °C, and MEC was less than 45 g/m3. Two of the powders had a KSt explosion rating of “extremely strong” (St-3). After a comprehensive evaluation of dust explosion sensitivity and dust explosion severity, all five additive samples were categorised as high-level potential dust explosion risks. Process safety staff and engineers working with petrochemical production should be aware of the risks posed by dust additives and be prepared to implement more stringent loss prevention measures to curtail the likelihood of dust explosions.

Atmospheric dust addition under elevated CO2 restructured phytoplankton community from the Arabian Sea: A microcosm approach

Atmospheric dust deposition in the North Indian Ocean, particularly in the Arabian Sea significantly impacts phytoplankton productivity. Importantly, the steady increase in Sea Surface Temperature (SST) of the Arabian Sea may intensify oligotrophy and the significance of atmospheric dust input for phytoplankton growth may escalate in the future. Furthermore, the globally increasing atmospheric CO2 is simultaneously impacting the surface ocean by decreasing its pH called Ocean Acidification (OA). We present here the first experimental study showing the impacts of atmospheric dust input under the simulated OA scenario on the natural phytoplankton communities from the Arabian Sea (winter monsoon). Phytoplankton cell density and chlorophyll (Chla) contents were enhanced in response to dust addition. The external input of inorganic nitrogen and iron (from dust) were the key growth-promoting factors that increased the relative contribution of micro and nanophytoplankton irrespective of the CO2 levels, whereas picophytoplankton decreased. The predominance of pennate diatoms and non-diatoms was mostly due to low dissolved silicate (DSi) availability. The cell density of the pennate diatoms Pseudo-nitzschia sp., Nitzschia sp., and Cylindrotheca closterium increased by several orders of magnitude in response to dust addition under OA. The dinoflagellates, Alexandrium sp., and Gymnodinium sp. showed higher tolerance to OA and proliferated in response to dust input. The present experimental conditions can be compared to the future ocean scenario (low DSi, OA, and dust input) where the proliferation of non-palatable/ toxigenic phytoplankton taxa may be expected which has the potential to impact ecological processes like trophic transfer, carbon cycling, and fisheries.

Morphological Features of PUR-Wood Particle Composite Foams.

The aim of this study was to apply waste wood particles (WP) with different sizes from primary wood processing as a filler for open-cell PUR foams. For this purpose, various wood particle sizes were added as a filler for polyurethane foams (PUR). The effects of the addition of of 0.05–<0.125 mm, 0.125–<0.315 mm, 0.315–1.25 mm, and >1.25–2.0 of WP to the polyurethane matrix on the density, the kinetics of PUR foaming, the cell structure, and the morphology were investigated. Scanning electron microscope (SEM) and X-ray computer tomography were used. Based on the results, it was found that the addition of WP in the amount of 10% leads to an increase in density with an increase in particle size. The research shows that the morphology of the PUR-WP foam is influenced by its particle size. The difference in the number and size of cells in PUR-WP composites depends on the wood particle size. The addition of dust causes the formation of cells of much smaller sizes; confirmed by SEM images. Moreover, computer tomography clearly demonstrates that the WP are well-dispersed within the foams’ structures.

Comparative study on the effects of quarry dust and natural fines on performance of concrete blocks

Natural fine aggregates have been used in the construction industry to bind with cementing materials in the presence of water for building structures. Its use has led to increased daily demand with a subsequent rise in prices as the reserves get exhausted. Its overdependence has resulted in increasing scarcity because of over-harvesting from river beds causing an increase in demand. Moreover, uncontrolled sand harvesting has imposed dire impacts on the various environmental subcomponents of the river ecosystem such as water quality and quantity, bedforms, sediment milieu, flora and fauna, and socio-economic conditions of the people in the long run. This has led to the agitated search for an ecofriendly and less expensive substitute that can produce comparable compressive strength when used in concrete making. Quarry dust, a waste product of the quarry's grinding operation, is gaining momentum as a viable alternative to the conventional aggregates in concrete manufacturing due to its accessibility and lower cost. Quarry dust poses environmental pollution when dumped hence its use in the production of concrete will mitigate the pollution. This research was to determine the impacts of the addition of quarry dust in the performance of Concrete blocks (CB). This was achieved through the evaluation of the compressive strength of the CBs when quarry dust is used instead of natural fine aggregates. The concrete blocks were cast using molds of size 150 mm x 150 mm x 150 mm and then cured for seven days, fourteen days, and twenty- eight days. The size of particle distribution, the slump and workability test, and compressive strength was done respectively for the fresh and cured concrete blocks. The 28-day prepared CBs were subjected to alternate dry and wet cycles to assess their durability performance. A cost-benefit analysis of the use of quarry dust in place of fine aggregates in CB was also be conducted. The results obtained was be subjected to a T-test to study the significant difference in the performance between CB and the control.

Development and Physio-Mechanical Characterization of Sustainable Jute-Wood Dust Reinforced Hybrid Composites

ABSTRACT Composite materials are the subject of modern material science developments. It’s been employed in a variety of real-world scenarios. Researchers have increasingly focused on natural fibers in composite materials because of its long-term influence and environmental concern. Conversion of waste into useful product is something the researchers are concentrating upon nowadays. The present work deals with Physio-Mechanical characterization of the sustainable jute and wood dust reinforced polymer matrix composite (PMC). The proposed composites are prepared using hand layup technique in five different combinations of compositions. The results exhibited better physio-mechanical properties and showed that optimum addition of wood dust is 30 wt% for obtaining improved mechanical properties of proposed composites. These proposed composites are found to be suitable for internal constructions such as partition walls at low cost.

Concentration, sources and health effects of silica in ambient respirable dust of Jharia Coalfields Region, India

BackgroundThe concentration of silica in occupational conditions is well defined and estimated around the world. Many countries in the world have developed air standards for occupational conditions based on the percent silica in ambient air. This is due to the pulmonary effect caused by silica yielding diseases like silicosis and pneumoconiosis. In India, occupational exposure to silica dust is regulated by Directorate General of Mine Safety (Tech.) (S&T) Circular No. 1 of 2004 Under Reg. 123 of Coal Mines Regulations, 1957 for any metal/non-metal mining operations estimated gravimetrically. As no silica standards are prescribed in India for non-occupational conditions, venturing into such analysis was well envisaged and perceived.MethodologyAir sampling was done at identified locations through high-volume samplers for 24 h, twice a week in pre-monsoon season (March to June) and the Whatman filter paper was sonicated at sufficient speed to isolate dust particles for energy dispersive X-ray.ResultsThe percentage of silica in “PM10” was found lowest in mining sites (15%), and highest in transportation sites (35%) and mid-value for mixed sites (24%). Thus, risk level gets magnified due to addition of finer dust generated in transportation and mixed sites than mining due to diesel driven vehicles. Burning of any fossil fuel generates high percentage of finer dust (< 2.5 µm).ConclusionsThere should be proper prescribed standard for silica for non-occupational conditions.

"Strength Analysis of Ceramic Dust Based Concrete with Partial Replacement of Cement by Polypropylene Fiber"

The utilisation of mineral admixtures such as ceramic dust, fly ash, and metakoline, amongst others, will result in the production of high-performance concrete. The effect that the percentage of ceramic dust and polypropylene fibre has on the mechanical properties of concrete has been investigated in this study. The purpose of this research was to investigate what happened when ceramic dust, polypropylene fibres, or a combination of the two were used to substitute cement in cement concrete. Ceramic dust content was varied as 5%, 10%, 15%, and 20% by weight replacement of cement, and polypropylene fibre was varied as 0.25%, 0.50%, 0.75%, and 1.0% by weight replacement of cement in order to investigate the effects of these two additives on the workability, compressive strength, and split tensile strength of concrete after 7, 28, and 90 days of curing time. The performance of the concrete in terms of its mechanical qualities was improved manyfolds with the addition of polypropylene fibres and ceramic dust; however, the results are astonishing when both types of additives are used together.

Mineralogical analysis of rock dust for remineralization of soil intended for pasture

The objective of this study was to verify the effects of rock dust on the soil of an area destined for pasture. Mineralogical analysis of the rock dust was performed using X-ray diffraction, and the major oxides and minor elements were analyzed using X-ray fluorescence. The soil samples were analyzed according to PROFERT-MG. The following were identified from the X-ray diffractogram of the total rock powder: quartz (43.66%), albite (38.10%), microcline (15.30%), and muscovite (1.80%). Regarding the major elements, SiO2 (81.92%), Al2O3 (11.04%), and Na2O (3.86%) were predominant, and an important amount of K2O (2.61%) was present. In the chemical characterization of the soil, an increase in the levels of P, K, Ca, Mg, Sb, t, V, organic matter, and organic carbon were observed with the addition of rock dust. A comparison of the chemical analysis results with the CONAMA quality reference values indicated that the rock dust sample had acceptable levels with respect to the quality reference for all analyzed heavy metals. In a comparative analysis with MAPA's Normative Instruction No. 5/2016, it was found that rock dust does not fully comply with the minimum requirements of the legislation. In full compliance with the IN from chemical analysis, it had a minimum required content of at least 1% for K2O. Preliminary studies have indicated that the application of this material as a remineralizer has potential, mainly in relation to the supply of K2O. However, physical adjustments are required in the beneficiation process to comply with the standards.

Recycling of exhausted dust from regenerator of glass furnace in glass batch melting

In soda-lime glass manufacturing, evaporation of volatile compounds from glass melt is the origin of the dust emission from glass tank furnace. The exhausted dust then is deposited on the regenerator and is needed to be removed. Thus, this study focuses on using the dust from melting glass in glass production. The glass batches were prepared from 0 wt% to 10 wt% of the exhausted dust from soda-lime glass production as a substitution of the total raw materials. The analysis of phase and chemical composition of the dust by x-ray powder diffraction (XRD) and x-ray fluorescence technique (XRF) indicated that it consisted mainly sodium sulphate. Thermal analysis (TG/DSC) revealed that the addition of exhausted dust reduced the temperature of the melting reaction of the glass batches. The optimum amount of the exhausted dust, which made it possible to obtain the glass with the lowest number of remaining bubbles, was 2 wt%. From CIE lab and dilatometry results revealed that up to 2 wt% replacement of total raw materials by the exhausted dust in the glass batch did not affect the glass color, thermal expansion coefficient, glass transition temperature and dilatometric softening point of glass samples.

Effect of Tire Buffings Addition on Compaction Properties of Bentonite-Sand, Bentonite-Rock Dust, and Bentonite-Sand-Rock Dust Mixes

Abstract: In landfills, the compacted bentonite-sand (B:S) combination is widely employed as a liner. Since sand is a scarce and expensive material, other waste materials such as rock dust which possess similar properties are used instead of sand, or in other cases, both sand and rock dust are mixed in varying proportions along with bentonite. Urbanization and population explosion have triggered the continuous increase in industrial waste output, particularly waste tires, which posed several challenges to mankind. Incorporating wastes tire as raw resources have been suggested in various industries. Waste tires as stabilizers and investigation of geotechnical properties of the composite can help to minimize pollution while also providing economic and scientific benefits. Past research indicates short fibre has been shown to improve the ductility, toughness, and resistance to tensile cracking of clays. Fibre-shaped tire buffings or tire dust (T) from the retreading process can be used as a fibre reinforcing element in a liner. The objective of this study is to examine the effect of fibre-shaped tire dust (T) addition on the compaction characteristics of bentonite-sand (B:S),bentonite-rock dust (B:R), and bentonite-sand-rock dust(B:S:R) mixes. Locally available sand and rock dust, and commercially available bentonite have been used in this research. The gradation of the (T) used is equivalent to poorly graded sand. Here, all the mixes were prepared with different (T) contents (2 to 16%), and the standard compaction tests were performed. The results reveal that when the tire dust increases, the variation in the optimum moisture content and maximum dry density follow a consistent and predictable pattern. To put it another way, with the increase in the percentage of tire dust in the combination, the optimum moisture content increases while the maximum dry density decreases. Additionally, relationships were offered to predict the maximum dry density and the optimum moisture content with various tire dust content of the composite to be functional in the field

Investigation of the influence of technological factors and compositions of binders on the strength characteristics of blast–furnace cement with magnetized ferromagnetic additives

Cement production is a significant source of carbon dioxide emissions. One of the ways to reduce emissions is to reduce the proportion of clinker in cement by introducing active mineral additives into its composition, particularly granulated blast-furnace slag. One of the ways to increase the activity of such cement is the effect of magnetic fields on the spin multiplicity of the substances involved in the hardening reaction. In this case, the maximum effect is ensured by introducing a magnetized finely dispersed ferromagnetic substance into the cement composition. The activation effect depends on the additive’s adding method to the cement’s composition, the components ratio in the cement, and the cement hardening mode. This work aims to identify the influence of the adding method of the additive, the slag and additive proportion in cement, and the steam curing temperature on the activity effect of the binder. Three groups of studies were carried out to determine the strength characteristics of laboratory samples hardened both in natural conditions and during steaming. In the first group, cement samples have tested containing 40% slag obtained by joint grinding and joint mixing of the additive with cement for 0.5, 1, 2, 4 and 8 minutes. In the second group, samples have tested with the additive amount varied from 0 to 2.5%, and slag amount from 0 to 80%. Finally, cement samples were tested in the third group containing 50% slag and from 0 to 2.5% additive. The samples were steam cured at temperatures ranging from 50 to 90° C and tested one day, 28 and 90 days after steam curing. As a result of the research, it has revealed that to obtain the maximum effect, the additive must be introduced into the cement composition by joint grinding. The factors influencing the activity have been determined. At the same time, the time of joint grinding should ensure uniform mixing of the components and the formation of new surfaces of cement grains in the presence of magnetic fields. Too long joint grinding leads to the loss of the magnetic properties of the addition. It was found that the activation effect from the additive addition increases with an increase in the proportion of slag. In cement without slag, an increase in the additive content leads to a drop in strength. It was revealed that the introduction of magnetized ferromagnetic dust additives into the composition of the SPC makes it possible to reduce the steam curing temperature of products by 20-25° C. Studies have shown that using a finely dispersed ferromagnetic substance as an activating additive can save energy resources and reduce emissions.

Cement and Clay Bricks Reinforced with Coconut Fiber and Fiber Dust

For generations, Sri Lankans use cement bricks and clay bricks as common building materials in the construction field. This study investigates the feasibility of improving the strength while lowering the mass and thermal conductivity of bricks by adding coconut fiber or coconut fiber dust as a reinforcing material. Each reinforcing material is used in both clay and cement bricks. The mixtures are prepared according to varying volume ratios of the raw materials used. Coconut fibers are combed and cut into 4-5 cm pieces and dry coconut fiber dust is sieved using a 4 mm sieving mesh. The mixture is prepared by hand mixing and the traditional processes are replicated in making the bricks. Tests are carried out to understand the variation of mass, compressive strength, thermal conductivity, and water absorption of the reinforced bricks in comparison to bricks with no reinforced material. The cement brick reinforced with coconut fiber achieves the expected results in the compressive strength test and thermal conductivity test but underperformed when comparing masses and water absorption. Clay bricks reinforced with coconut fiber dust show impressive results in compressive tests and with the addition of dust, the appearance seems to have changed. It is observed that reinforcing cement bricks with coconut fiber could double the compressive strength along with a 5% reduction in mass. Reinforcing clay bricks with coconut fiber dust increases its compressive strength by over 70% while decreasing the mass by over 30 %. The study proves that it is feasible to use reinforced coconut fiber or coconut fiber dust to improve the properties of both clay and cement bricks, while clay bricks reinforced with coconut fiber are an exception.

Basalts of the Arapey Group and their potential use as a source of agrominerals (stonemeal)

The technique known as rochagem, stonemeal or rocks of crops consists of the addition of rock dust to increase the fertility conditions of the soil. In this paper, preliminary geochemical studies of the basalts of Los Catalanes Formation (Grupo Arapey) of three slag heaps are presented as a result of the disposal of mining activity in the Department of Artigas, and compared with successful use experiences of lithologies correlative to the region, specifically in the basalts of the Serra Geral Formation in the southern part of Brazil. The results obtained show SiO2, Al2O3 and Fe2O3 as the principal oxides, and in a smaller proportion, they are followed by CaO, MgO Na2O, TiO2, K2O and P2O5. The most noticeable differences are in the content of minor and trace elements such as Mn, Cr, As, Cd, Ba, Sr, V, Pb, Ti, Zn and Zr, possibly due to geochemical differences between streams. This study should be addressed in more detail in future works. In addition, the potential use of Los Catalanes Formation as an agromineral source and the development of the stonemeal technique in Uruguay are discussed. The possibility of using alternative inputs brings two productive activities, such as mining and agriculture, into dialogue, contributing to the sustainable development thereof.

Using Waste Ceramic Dust in Stabilization of Clay Soils

A considerable amount of the globally produced ceramic goes to waste daily. Ceramic wastes that are sent to the landfills have negative effects on soil, water, and the environment, as they contain aluminum, silica and iron oxide. The waste water leaching to the soil contains insoluble particular matter or heavy metals and could damage the plants. The air emission of the ceramic waste dumping process is also very high and it has negative effect on environment and human health by spreading dust. Using waste ceramic dust in soil stabilization could be for better disposal of such waste. The usage of natural resources can be minimized as well as prevent additional environmental burden and emissions. For this purpose, three local clay soil samples from Erbil in North-Iraq were gathered and the effects of addition of waste ceramic dust on mechanical properties of these samples were experimentally examined in two different grading sizes. The ceramic dust with particle sizes passing sieve No.40 and sieve No.10, in the proportion of 0, 5, and 10% percentages were used. The study showed that with an increase in ceramic dust percentages, liquid limit, plastic limit, plasticity index, optimum moisture content of the clay decreased. On the other hand maximum dry density, unconfined compressive strength and California bearing ratio increased. The study showed that addition of No.10 gradation ceramic dust results in higher improvement compared to the same amount of ceramic dust in No.40 size. The current work concludes that soil stabilized with the right type and ratio of ceramic dust could be suitable for a sustainable highway construction subgrade by reducing the design thickness and potentially be more economic.

Study on the Compaction Characteristics of Soil Mixed with Quarry Dust for Effective Recycling of Waste from Stone Quarries

ABSTRACT Exploring the viability of utilizing the quarry dust waste in construction is investigated in this study through laboratory experiments. Standard Proctor test is conducted for the two groups of soil samples (Group 1 soil without quarry dust, N=17; Group 2 soil with quarry dust, N=17). The results show that the optimum moisture content (OMC) of soil decreases and the maximum dry density (MDD) increases due to the addition of quarry dust with the soil. Also, there is a significant difference between the two groups of soil as the value of p&lt;0.05. Thus the quarry dust can be used as an additive material so as to improve the compaction characteristics of the soil.

Evaluation of Engineering Behaviour of Expansive Soil with Addition of Lime and Quarry Dust

The Kota city, which is situated in Rajasthan state of India, is having a major problem of disposing the quarry dust. Quarry dust is a waste product produced by the stone industry during the cutting and crushing of stone. This byproduct is affecting the environment and land fertility as well. One of the innovative techniques for ground improvement can be practiced by using quarry dust as soil stabilizing agent. This technique may simultaneously offer the environmental sustainability, use of industrial waste, and space saving. The Expansive Soil (ES) deposits in Kota district and its neighboring districts, Jhalawar and Baran, make it difficult to build large constructions. In order to make the soil suitable for construction, quarry dust and lime are used for stabilization of the ES in this study. The UCS and CBR value was increased after adding of quarry dust with 6% lime and stabilized soil has superior load bearing capacity.

Impact of dust addition on the microbial food web under present and future conditions of pH and temperature

Abstract. In the oligotrophic waters of the Mediterranean Sea, during the stratification period, the microbial loop relies on pulsed inputs of nutrients through the atmospheric deposition of aerosols from both natural (e.g., Saharan dust), anthropogenic, or mixed origins. While the influence of dust deposition on microbial processes and community composition is still not fully constrained, the extent to which future environmental conditions will affect dust inputs and the microbial response is not known. The impact of atmospheric wet dust deposition was studied both under present and future environmental conditions (+3 ∘C warming and acidification of −0.3 pH units), through experiments in 300 L climate reactors. In total, three Saharan dust addition experiments were performed with surface seawater collected from the Tyrrhenian Sea, Ionian Sea, and Algerian basin in the western Mediterranean Sea during the PEACETIME (ProcEss studies at the Air–sEa Interface after dust deposition in the MEditerranean sea) cruise in May–June 2017. Top-down controls on bacteria, viral processes, and community, as well as microbial community structure (16S and 18S rDNA amplicon sequencing), were followed over the 3–4 d experiments. Different microbial and viral responses to dust were observed rapidly after addition and were, most of the time, more pronounced when combined with future environmental conditions. The dust input of nutrients and trace metals changed the microbial ecosystem from a bottom-up limited to a top-down controlled bacterial community, likely from grazing and induced lysogeny. The relative abundance of mixotrophic microeukaryotes and phototrophic prokaryotes also increased. Overall, these results suggest that the effect of dust deposition on the microbial loop is dependent on the initial microbial assemblage and metabolic state of the tested water and that predicted warming and acidification will intensify these responses, affecting food web processes and biogeochemical cycles.