Experimental Insights of Using Waste Marble Fines to Modify the Geotechnical Properties of a Lateritic Soil

Abstract

Abstract. Trinitrotoluene (TNT), a commonly used explosive for military and industrial applications, can cause serious environmental pollution. 28-day laboratory pot experiment was carried out applying bioaugmentation using laboratory selected bacterial strains as inoculum, biostimulation with molasses and cabbage leaf extract, and phytoremediation using rye and blue fenugreek to study the effect of these treatments on TNT removal and changes in soil microbial community responsible for contaminant degradation. Chemical analyses revealed significant decreases in TNT concentrations, including reduction of some of the TNT to its amino derivates during the 28-day tests. The combination of bioaugmentation-biostimulation approach coupled with rye cultivation had the most profound effect on TNT degradation. Although plants enhanced the total microbial community abundance, blue fenugreek cultivation did not significantly affect the TNT degradation rate. The results from molecular analyses suggested the survival and elevation of the introduced bacterial strains throughout the experiment. Keywords: TNT, bioaugmentation, biostimulation, phytoremediation, microbial community.

Isolated Effect and Sensitivity of Agricultural and Industrial Waste Ca-Based Stabilizer Materials (CSMs) in Evaluating Swell Shrink Nature of Palygorskite-Rich Clays

“…It is due cation exchange which causes flocculation and subsequently reduces the double layer thickness around clay particles [61]. ese results of decreasing trends are consistent with findings of past researchers [91,94,95]. It is noteworthy to mention here that the effect of addition of 2-4% CaO brings about an insignificant change in the PI value [96].…”

Investigation of Calcium Carbide Residue as a Stabilizer for Tropical Sand Used as Pavement Material

“…The decrease in the plasticity index of the stabilized soil should normally indicate that the application of CCR to the soil made it more workable [23], [24]. However, a plot of the results of the Atterberg limits test, for the soil-CCR mixtures, on the plasticity chart shows otherwise (Fig.…”

Experimental Study of the Usability of Recycling Marble Waste as Aggregate for Road Construction

“…This has a considerable effect on the natural aggregate demand [1]. Performance of the different pavement layers depend on the properties of the aggregate grains and on the behavior of aggregate in a matrix [2].…”

“…Marble is crystalline rock composed predominantly of calcite, dolomite, or serpentine materials [9,10]. Nowadays, marble waste becomes a source of concern to environmentalists and to marble manufacturers [2]. For this, many attempts have been made to incorporate marble waste in many building materials, which include improving the fresh and hardened self-compacting concrete properties [11][12][13][14][15][16][17][18][19], as a raw material for Portland cement [4,[20][21][22][23] and as an additive material in industrial brick [24,25].…”

“…For this, many attempts have been made to incorporate marble waste in many building materials, which include improving the fresh and hardened self-compacting concrete properties [11][12][13][14][15][16][17][18][19], as a raw material for Portland cement [4,[20][21][22][23] and as an additive material in industrial brick [24,25]. Waste marble dusts are also used in stabilizing problematic soils [2,26].…”