Civil and Structural Engineering, Environmental Engineering, Environmental Engineering, Waste Management and Disposal
7
Scopus Publications
Scopus Publications
Activated Charcoal and Natural Soil Granules for Removing Fluoride from Aqueous Solution and Groundwater Madhumati S. Dhaduti, Anand M. Hunashyal, S. K. Rajappa, Sharanappagouda Kadabinakatti, Siddalingappa S. Hubballi Journal of the Institution of Engineers India Series A, 2025 Many effective and efficient treatment technologies have been applied for fluoride removal, but are found to be energy-intensive, expensive, requiring high operational and capital inputs, and need advanced technologies and skilled manpower. Adsorption, by contrast, is a flexible, efficient, simple-to design, and cost-effective treatment method. Many adsorbent types along with recently emerged nanoadsorbents represent a very promising treatment technology, but the limitations of this technology are still being studied. This implies that a lot of work is required by the scientific community to effectively apply this technology towards environmental sustainability, particularly in the water sector. In this work, thermally treated granular medium adsorbent prepared using combination of Regur soil, Omnibus soil and activated charcoal are used as adsorbent for defluoridation experiment. The fluoride reduction in aqueous solution after 1 h was 70% with adsorbent dosage of 4.8 g with 5 mg/L as the starting fluoride and 78% for groundwater sample with 3.6 mg/L starting fluoride. Reduction in fluoride was significantly observed for a pH range of 2 to 14, highest fluoride reduction was observed at pH range of 6 to 10. The isotherm model study gave better fit for Langmuir isotherm with regression parameter (R2 = 0.98) than the Freundlich isotherm (R2 = 0.84) which signifies monolayer adsorption. The study adhered to pseudo-second order kinetics. Surface morphology of the granular medium is also studied using SEM and EDAX and due to fluoride ions adsorption on the adsorbent surface there was textural change observed. This study indicated that thermally processesed soil and activated charcoal adsorbent was effective for defluoridation of aqueous solution with 70% reduction and groundwater with 78% reduction and hence can be used as cost effective adsorbent as naturally available materials with minimum processing are being used. However future research studies can be carried out with varying ratios of other efficient natural materials in order to increase the efficiency of defluoridation.
TREATMENT OF COLLEGE CANTEEN SULLAGE USING MICROCOSM PHYTORID SYSTEM Madhumati Dhaduti, Sandeep Dhaduti, Shridhar Budapanahalli, Sharanappagouda Kadabinakatti, Siddalingappa Hubballi Acta Periodica Technologica, 2025 Wastewater is commonly characterized as ?sullage? and ?blackwater?, Reuse of sullage is possible only after proper treatment. Amongst available sullage treatment methods, Phytorid method which works on the principle of natural wetlands prove to be cost-effective and simple in monitoring. In this study, the treatment of college canteen kitchen sullage is done using Phytorid technology, a pilot scale reactor setup with plants like Canna Indica, Moses in the cradle, Spider plant, Golden Duranta and Beach spider lily are planted in separate containers filled with layers of gravel (bottom), sand (middle) and garden soil (top). The sullage was passed through five containers containing plants and the control. The raw sullage and the effluent were analysed for pH, electrical conductivity, TDS, Chlorides, Phosphates, Sulphates, BOD and COD for 7, 14 and 21-days intervals. The characterization of the sullage sample from the college canteen kitchen had pH ranging from (6.98 to 7.80), electrical conductivity (1560 to 1600 ?S/cm), TDS (1150 to 1210 mg/L), Chlorides (345.43 to 387.50 mg/L), Phosphates (12.43 to 13.63mg/L), Sulphates (136.25 to 142.1 mg/L), BOD (398 to 416 mg/L) and COD (489 to 535mg/L). The results showed that Beach spider lily showed higher reduction efficiency for Electrical conductivity (15.94%), Chlorides (87.68%) and Phosphates (79.43%). Spider plant showed higher reduction efficiency for Sulphates (38.69%), TDS (30.17%) and COD (75.05%) whereas, Golden Duranta was efficient in reducing BOD (88.94%). All the plants were efficient in neutralizing the pH. From the study, it can be concluded that a phytorid system consisting of Beach Spider lily, Spider plant and Golden Duranta will be efficient in reducing the physio-chemical parameters of sullage. Reusing treated sullage for flushing and gardening will promote water recycling and conservation.
Implementation of Cement-based nano composite Energy Absorption Damper to improve the damping properties of concrete and monitoring applications Sandhya R. Jalgar, A.M. Hunashyal, A.K. Roopa, M.A. Umarfarooq, S.N. Mathad, Madhumati S. Dhaduti E3s Web of Conferences, 2023 The energy from the moving seismic waves through a building structure is dispersed by means of dampers. Dampers work by converting the kinetic energy into heat energy, dissipating it into the hydraulic fluid. Damper systems are designed and manufactured to protect structural integrity, reduce structural damage, and prevent injury to people by absorbing energy from earthquakes and minimizing structural deformations. The most effective way to achieve good vibration damping is by tailoring the construction materials such as cement with nanomaterials like Silica, Alumina, Graphene, CNTs, etc. This paper focuses on developing a vibration damper, prepared by cement nanocomposite containing MWCNTs and Carbon fibers. The tests, such as the Impact, Flexural, and Compressive strength tests, are conducted to investigate their energy-absorbing capacity, strength, and durability. The microstructural analysis SEM is performed to know the morphology of concrete mix with MWCNTs and Carbon fibers on damping mechanism. Impact test results indicate that the beams without MWCNTs and CFs exhibited an average energy absorption of 248 J, while those with MWCNTs and CFs absorbed an average energy of 262 J which shows almost 15% more energy absorption. Adding nanomaterials in a cement matrix improves concrete’s frictional damping energy consumption ability and increases structures’ energy-absorbing properties, flexural strength, and compressive strength.
Investigation of Nano-Composite Dampers Using Different Nanomaterials in Civil Engineering Structures: A Review † Sandhya. R. Jalgar, Anand M. Hunashyal, Roopa A. Kuri, Madhumati. S. Dhaduti, Shridhar N. Mathad Engineering Proceedings, 2023 Civil engineering structures need to be protected from earthquakes, representing a new area of research that is growing continuously and very rapidly. Design engineers are always searching for lightweight, stronger, and stiffer materials to be applied as vibration-damping materials. Stability in dynamics necessitates an active, robust, and convenient mechanism that can absorb the kinetic energy of vibration to prevent the structural system from resonance. Recently, many researchers have successfully used nanomaterials to develop energy-absorbing materials that are lightweight and cost-effective. Traditional damping treatments are based on combinations of viscoelastic, elastomeric, magnetic, and piezoelectric materials. In this paper, a review of various damping techniques for composites made of cement modified by various nanomaterials like Nano Al2O3 (Aluminum Dioxide), Nano SiO2 (Silicon Dioxide), Nano TiO2 (Titanium Dioxide), Graphene, and CNTs (Carbon Nanotubes) is presented. The designs of various nano-composite dampers are presented to strengthen the information progress in this field. The current study’s goal is to discover how nanoparticles impact the cement-based material’s damping properties. The study examined several nanomaterials in cement composites at differing concentrations. With the help of the Dynamic Mechanical Analysis (DMA) method and the Logarithmic Decrement approach, the damping properties of these composites were examined. Scanning Electron Microscopy (SEM) was used to examine the effects of nanomaterials on the microstructure and pore size distribution of the composite. Increasing the quantity of nanoparticles in cement paste may improve its capacity to lessen vibration. The experiments also showed that certain nanomaterials may improve load transmission inside the cement matrix and connect neighboring hydration products, helping to reduce energy loss during the loading process. These nanoparticles will eventually replace the large machinery employed to dampen vibrations in buildings due to their small weight, increased mechanical strength, and effective damping properties.
