RAHUL GAUTAM - Academia.edu (original) (raw)

Papers by RAHUL GAUTAM

Global NEST International Conference on Environmental Science & Technology

Microbial Fuel Cell (MFC) technology is based on bioelectrochemical system, extract power from or... more Microbial Fuel Cell (MFC) technology is based on bioelectrochemical system, extract power from organic load of the wastes to produce bio-electricity. The present study have evaluated the effect of the different electrode materials in two sets of mediator-less H- type double chambered MFC operated at 30 ± 2 °C in a batch mode. In MFCGG, graphite rods (G) and in MFCCBG carbon brush (CB) and graphite rod (G) were used as anode and cathode electrode respectively. The both MFC were fed with distillery spent wash as a substrate with HRT of 21 days. The maximum COD removal of 61.07 % and 67.17 %; open circuit voltage (OCV) of 565 and 735 mV were achieved in MFCGG and MFCCBG respectively. The peak power densities of 3.19 W/m2 and 5.4 W/m2 were recorded in MFCGG and MFCCBG. These results suggest the efficacy of carbon brush anode in MFCCBG compared to graphite rod as an anode material in MFC for bioelectricity production.

Lecture Notes in Mechanical Engineering

Waste-to-Energy Approaches Towards Zero Waste

Materials Today: Proceedings

Abstract The population explosion and exponential increase in energy demand of the world have cre... more Abstract The population explosion and exponential increase in energy demand of the world have created enormous stress on finite fossil fuels and posed a threat to the environment. The sustainable Bio-Electrochemical Systems which include Microbial Fuel Cells (MFC), Microbial Electrolysis Cells (MEC) etc. can generate energy from waste. The present study has intended to utilize Sewage sludge (SS), Compost leachate (CL), and Mess Food waste (FW) as an organic substrate in an Integrated Bio-Electrochemical system to evaluate the bioelectricity generation potential in dual-chambered H type MFCs, then utilization of digestate from MFCs for Bio-hydrogen production in MECs. The maximum open-circuit voltages of 595 mV, 505 mV, and 690 mV were recorded in SS, CL, and FW fed MFC respectively, and their corresponding peak power densities of 1.8 ± 0.1 W/m2, 1.3 ± 0.1 W/m2 and 2.4 ± 0.1 W/m2 respectively were generated. The COD removal of 62.37%, 66.8%, and 50.19% were achieved for MFC fed with SS, CL, and FW respectively. The digestate fed MECs had further shown COD removal of 55.26%, 64.40% and 46.61% of the digestate in the "MFC turned MEC" system. The corresponding volumes of gas produced per gram of COD removal were reported as 23.8, 18.1 and 55.1 for SS, CL and FW respectively. The overall COD removal by bio-electrochemical system (BES) of 83.25%, 88.23 % and 73.41% for SS, CL and FW were achieved. The higher OCV of 690 mV and 55.1 mL of bio-hydrogen per gram of the COD removed has suggested the suitability of the FW for Integrated Biochemical system. . The comparative higher performance of FW as feeds has established itself as a potent choice for bio-electricity and bio-hydrogen production.

Nanotechnology for Environmental Engineering, 2022

In this research, waste lime sludge (LS) nanoparticles procured from integrated pulp and paper mi... more In this research, waste lime sludge (LS) nanoparticles procured from integrated pulp and paper mill were used as the flocculent material to harvest the marine microalgae Tetraselmis indica (T. indica). LS contains 80–85% of calcium carbonate in the form of calcite with rhombohedral and scalenohedral structures along with other minerals such as Mg, K, Fe, and Na. XRD results showed that lime sludge particles have an averaged crystallite size of ~ 39 nm. The biomass harvesting efficiency of T. indica was observed at different doses of flocculent (0–160 mg L −1 ), temperature (30, 35, 40, 45, and 50 °C) and mixing rate (100–300 rpm), respectively. Maximum biomass harvesting of 86% was observed at 50 °C with 140 mg L −1 flocculent dose, pH 7, and 150 rpm in 90 min. It was also observed that LS has no effect on biodiesel profile of T. indica . Scanning electron microscopy (SEM) images revealed agglomeration of microalgal cells and deposition of calcium carbonate on its surface upon treatment with LS at 50 ºC. Experimental data were found to be in good agreement with pseudo-second-order kinetics model. This study indicated that waste lime sludge is a potential material for high harvesting efficiency in low settling time and low-cost harvesting of microalgae and it makes the production of biodiesel cost-effective.

International Journal of Research, 2014

This research paper investigates into the usefulness of the ExoPolySachharide Secreting Bacteria.... more This research paper investigates into the usefulness of the ExoPolySachharide Secreting Bacteria. The research has been undertaken to explore further in the field of the potential uses of the ExoPolySachharide Secreting Bacteria. It should be noted that over the years, only a few of the possible polysaccharide candidates such as cellulose, dextran, xanthan , levan , and alginate for commercial microbial production have been extensively studied. The search for new polysaccharides has resulted in the development of several new and useful applications with commercial potentials. The research paper shows enormous potential of ExoPolySachharide SecretingBacteria in isolation and characterization of such bacteria’s from various available sources with a vision to find potential solutions to day-today problems of mankind associated with it.

Waste-to-Energy Approaches Towards Zero Waste, 2022

ajebs.com

The consumption of alcohol is on rise across the country penetrating in to all classes of society... more The consumption of alcohol is on rise across the country penetrating in to all classes of society across age groups. Although alcohol has numerous side effects including addiction, the social stigma attached to it seems to be fading away. With governments ...

Chemical Engineering Journal