R S Singh

Indian Institute of Technology BHU | BHU · Department of Chemical Engineering and Technology

Scientific research on the concentration and size distribution of bioaerosols in diverse environmental conditions is recently being prioritized. Exposure to bioaerosols, especially through inhalation, is linked to many severe health complications. The inhalation of the bioaerosols is directly linked with the size as well as the nature of the bioaer...

This study systematically investigates the optimization of synthesis parameters for ternary layered double hydroxide (LDH) to achieve a pure phase and high crystallinity. The [Co0.52+Al0.253+Fe0.253+(OH)2].(CO32−)0.125.mH2O$[{\mathrm{Co}}_{0.5}^{2 + }{\mathrm{Al}}_{0.25}^{3 + }{\mathrm{Fe}}_{0.25}^{3 + }( {\mathrm{OH}})_2 ].( {\mathrm{CO}}_3^{2 - }...

Fog is a common atmospheric event in northern India. Frequently, dense and prolonged fog envelops the entire Indo-Gangetic Plain (IGP), especially in the winter season. During winter, conducive atmospheric conditions also facilitate the accumulation of airborne particulates near the earth surface, significantly reducing atmospheric visibility in th...

Microbial fuel cell (MFC) is a promising emerging technology in which waste can be converted into energy, hydrogen and many other valuable products. Proton exchange membrane (PEM) contributes a significant portion (around 50%) of the overall cost of MFC. The current study focuses on synthesizing low-cost PEM using biochar produced by biomass pyroly...

Arsenic ranks first on the Substance Priority List of the Agency for Toxic Substances and Disease Registry and causes a wide range of health problems, including cancer and even death. The present work was focused on the removal of arsenic using bacteria, Proteus alimentorum strain TY6 and Pseudomonas aeruginosa strain K7Pb, immobilized on peanut sh...

The main aim of this study is to evaluate the performance of a single slope solar still and to assess the effect of nanofluid on its performance. A single basin single slope solar still was designed and fabricated at the Department of Chemical Engineering, IET Lucknow. Its performance was assessed in terms of the yield of potable water. The effect...

Temperature control for fermentation is crucial as it directly affects microorganism growth, productivity, and metabolic activity. This work proposes a modified fractional order proportional‐integral‐derivative (FOPID‐DF) controller that incorporates the system model in the control loop configuration utilizing a differential filter for precise temp...

A systematic analytical and experimental method of identification of Two Input Two Output (TITO) Quadruple-Tank Process (QTP), operated at non-minimum phase condition has been presented. Parameters of the process transfer function matrix have been validated on an experimental laboratory-scale physical setup of the process. Appropriate input-output...

The winter period is most ideal for studying near-surface aerosols in the Indo-Gangetic plains (IGP) of India, since this period is inundated with significantly higher concentrations of aerosols across the unique geographical domain because of shallow atmospheric boundary layer. This study focuses on analysing the concentration of the biotic compon...

In recent years, the building industry has looked for technological ways to protect the environment and preserve natural resources. Since the COVID-19 epidemic, there has been a shortage of building materials, which has caused construction costs to go up. This has made it more important for sustainable development to be based on the principles of t...

This study investigated the degradation of Acid Blue 113 (AB 113) dye using Klebsiella grimontii entrapped Graphene Oxide-Calcium Alginate Hydrogel beads (KG-GO-CA) in a Fluidized Bed Bioreactor (FBBR) under varying inlet loading rates. The minimum fluidization velocity of the KG-GO-CA hydrogel beads in FBBR was found to be 0.15 mm/s. The KG-GO-CA...

Integratingphotocatalysisand biodegradation has shown great potential in wastewater treatment technology. In this study, the degradation of p-cresol in water has been investigated through an integrated system comprising of photocatalytic and packed bed biofilm reactor (PBBR). In the photocatalytic reactor, the biodegradability index (BOD5/COD, BOD5...

In this study Ochrobactrum intermedium (Alhpa-22) was isolated from petroleum refinery sludge and characterized by using 16rRNA. In experimentation, for decolrization of methyl orange dye an indigenous noble bacterial ochrobactrum intermedium (Alhpa-22) at 35 °C has been used in a bioreactor. The ochrobactrum bacterial decolorized methyl orange dye...

Wastewater containing excess phenolic compounds is considered a major environmental concern due to its adverse impacts on the ecosystem. In this work, an effort has been given to treat the p-cresol from wastewater using Recirculating Packed Bed Biofilm Reactor (RPBBR). The process parameters, namely inoculum dose, pH, and NaCl (w/v) concentration w...

In this study, Bacillus licheniformis immobilized with low-density polyethylene (LDPE) was employed to degrade Brilliant Green (BG) dye from wastewater in a packed bed bioreactor (PBBR). Bacterial growth and extracellular polymeric substance (EPS) secretion were also assessed under different concentrations of BG dye. The impacts of external mass tr...

In this study, a wet proof multiple air cathode microbial fuel cell that generates bioelectricity by biodegradation of organic matter was fabricated. In this, platinum coated (0.5 mg/cm2) carbon cloth was used as air cathode and graphite rod was used as anode. The maximum power produced by MFC was 1.65042, 0.66951, 0.425061 mW on the 2nd day of ope...

The objective of this work was to develop a low-cost and efficient biocarrier for biodegradation of azo dye (i.e., Congo red (CR) dye). The potential bacterial species, i.e., Lysinibacillus fusiformis KLM1 and Lysinibacillus macrolides KLM2, were isolated from the dye-contaminated site. These bacterial species were immobilized onto the polypropylen...

It has long been known that the textile industry generates a massive amount of synthetic waste across the globe. Dye-containing wastewater is carcinogenic, mutagenic, recalcitrant, and xenobiotic. Several techniques have been developed for textile wastewater treatment. Most often, especially for dye-containing synthetic waste, bioremediation has no...

In this study, arsenite [As(III)] and arsenate [As(V)] removal efficiency of peanut shell biochar (PSB) and modified peanut shell biochar (MPSB) was compared in aqueous solutions. The modification was carried out with KMnO4 and KOH. Sorption efficiency of MPSB was relatively higher than PSB at pH 6 for As(III) (86%) and for As(V) (91.26%) for initi...

Imidacloprid is one of the frequently used insecticides. Indiscriminate use of imidacloprid makes it perilous to non-target organisms as well as the environment, including soil and water sources, thus, making its elimination from the environment an irresistible concern. Bioremediation is a technique that uses the degrading capabilities of bacteria...

This study aims to investigate the biodegradation of brilliant green (BG) dye in a packed bed bioreactor (PBBR) using Bacillus lichenifomis immobilized polyurethane (PU) foam as support material. The operating process parameters (e.g., pH, dye concentration, and inoculum dose) were optimized using response surface methodology (RSM) and artificial n...

In the last few decades, Brilliant green (BG) dye is widely employed to color the fabric materials in various industries (e.g., textile, pulp and paper, etc.). The wastewater containing BG dye emerges as a major challenge among the researchers due to its toxic, mutagenic, and carcinogenic effects on human beings and marine life. In this context, th...

This work investigated the performance of the integrated system (i.e., a Photocatalytic reactor followed by a Fixed bed bioreactor (PC-FBR)) for the degradation of complex Acid Blue 113 from wastewater. Initially, a Photocatalytic reactor was employed to improve the biodegradability index (i.e., BOD/COD) of wastewater from 0.21 ± 0.0062 to 0.395 ±...

Bioaerosols are present everywhere around us, either on surfaces or in the air. Depending on their nature, these bioaerosols have positive or negative impacts on our bodies. Our immune system always creates a balance in our health system in response to these bioaerosols. If our body’s immune system is compromised for a while, it could have many sev...

4-Chlorophenol (4-CP) is a persistent organic pollutant commonly found in petrochemical effluents. It causes toxic, carcinogenic and mutagenic effects on human beings and aquatic lives. Therefore, an environmentally benign and cost-effective approach is needed against such pollutants. In this direction, the chlorophenol degrading bacterial consorti...

Background: Curcumin is well known bioactive compound available in Curcuma domestica Valet i.e. turmeric. The research work was carried with intention to get maximum yield of medicinally active constituents (Curcumin) of Curcuma domestica Valet. rhizomes through supercritical fluid extraction. Methods: The experiments were conducted in the year 201...

In the past few decades, the presence of persistent and emerging contaminants in the wastewater has become a major concern due to their associated threats and impacts on the aquatic life and human health. It requires the development of an environmentally benign and cost-effective technique for the removal of such contaminants. In this direction, a...

Dyes are an important class of organic pollutants and are well known for their adverse effects on aquatic life and human beings. In this work, an effort has been made to treat the dye-containing wastewater using modified biocarriers in packed bed bioreactors (PBBRs). Lysinibacillus sp. immobilized polyurethane foam combined with activated carbon an...

In this work, an effort has been made to design the process variables and to analyse the impact of mixing intensity on mass transfer diffusion in a moving bed biofilm reactor (MBBR). A lab-scale MBBR, filled with Bacillus cereus GS2 IIT (BHU) immobilized-polyethylene biocarriers, was employed to optimize the process variables, including mixing inte...

The presence of emerging contaminants in the effluents of wastewater treatment plants is a matter of growing concern. Emerging contaminants are chemical compounds including pesticides, pharmaceuticals, hormones, other endocrine disruptors, surfactants, surfactant metabolites, industrial additives and personal care products. The occurrence of variou...

The present work provides an insight on the removal of dye and energy recovery simultaneously by Acinetobacter pitii in microbial fuel cells. It focuses on decolorization of reactive orange 16 dye and electricity production in a microbial fuel cell using bacterial isolate Acinetobacter pitii. This isolate removes 92.70% of color at a fixed concentr...

Green macroalgae comprise significant amount of structural carbohydrates for their conversion to liquid biofuels. However, it generally relies on species characteristics and the variability in seasonal profile to determine its route for bioprocessing. Hence, this study was conducted to analyze the indigenous marine macroalgal strain (Ulva prolifera...

Water pollution, mainly occurring from manufacturing industries, has been a serious environmental issue in the contemporary world. Dyeing processes produce a massive amount of dye-contaminated effluent; it is a major culprit for water and soil pollution in developing and underdeveloped countries. The azo dye released from industries poses a severe...

Development in Wastewater Treatment Research and Processes Removal of Emerging Contaminants from Wastewater Through Bio-nanotechnology 2022, Pages 629-650 Chapter 27 - Hybrid bioreactor in combination with ozone-based technologies for industrial wastewater treatment Author links open overlay panelAnujChaturvediRavi PrakashJaiswal https://doi.org/10...

The discharge of effluents from the textile industry is a multidimensional problem that affects the ecosystem in many ways. Though many new technologies are being developed, it remains to be seen which of those can be practiced in a real scenario. The current investigation attempts to absorb the Malachite Green, an effluent from textile dye using C...

The Lysinibacillus fusiformis immobilized polyurethane foam–polypropylene bio carrier was used as support media in an anaerobic moving bed bioreactor to evaluate the biodegradation of Congo red (CR) dye. The process variables like CR dye concentration (20–100 mg/L), bio carrier filling ratio (BFR) (20–70%), and agitation speed (40–100 RPM) were opt...

The textile industry, at various stages of fabric dyeing, generates huge volumes of wastewaters which eventually overload the aquatic bodies with wide range of dyes as persistent pollutants. In the present study, a recirculating fixed-bed bioreactor (RFBB) was operated in anaerobic and, anaerobic-aerobic environments to treat the simulated textile...

In this study, sponge-modified carrier, i.e., polypropylene–polyurethane foam (PP–PUF) was used in the bioreactors, namely moving bed bioreactor (MBBR) and packed bed bioreactor (PBBR), for the biodegradation of 4-CP. The Bacillus consortium isolated from the petroleum refinery site was used for the immobilization purpose. A comparative analysis wa...

A rigorous knowledge of the bacterial growth kinetics is essential for the scaling-up and optimization of biodegradation process conditions in a bioreactor. Although a great deal of literature is available on the modeling of bacterial growth kinetics considering the inhibition at high substrate-loading, the inhibition caused by toxic metabolic bypr...

In this work, an effort has been made to develop an integrated system (ozonation followed by biodegradation) for the treatment of Acid orange 7 (AO 7) dye. The process parameters such as pH (3.0–11) and ozone dosage (5–25 mg/L) were optimized and obtained as 3.0 and 25 mg/L, respectively to treat the AO 7 by ozonation. Similarly, the process parame...

In this work, an effort has been made to develop an integrated system (ozonation followed by biodegradation) for the treatment of Acid orange 7 (AO 7) dye. The process parameters such as pH (3.0–11) and ozone dosage (5–25 mg/L) were optimized and obtained as 3.0 and 25 mg/L, respectively to treat the AO 7 by ozonation. Similarly, the process parame...

In this study, sponge-modified carrier, i.e., polypropylene-polyurethane foam (PP-PUF) was used in the bioreactors, namely moving bed bioreactor (MBBR) and packed bed bioreactor (PBBR), for the biodegradation of 4-CP. The Bacillus consortium isolated from the petroleum refinery site was used for the immobilization purpose A comparative analysis was...

Arsenic, even in trace concentration presents several adverse impacts on human health and are classified among carcinogenic species. The subsequent health concerns owing to consumption of arsenic contaminated water has been widely reported, however, the presence and effects of arsenic through air still remains to be explored thoroughly, due to the...

A laboratory-scale Microbial Fuel Cell (MFC) is used for the degradation of reactive red 120 (RR120) using bacterial strain Staphylococcus equorum RAP2 (Accession number MW36539) isolated from wastewater treatment plants capable of degrading 100 % of dye (100 ppm) in 72 h at pH 7 efficiently. The effect of pH, concentration, and time on dye degrada...

The wastewater containing the azo dye is a global environmental challenge among researchers. In this study, an effort has been made to use a modified carrier (i.e., low-density polyethylene-polypropylene (LDPE-PP)) to remove the Congo red (CR) dye from synthetic wastewater in a moving bed biofilm reactor (MBBR). The effect of CR dye concentration (...

Aromatic hydrocarbons (AHCs) are one of the major environmental pollutants introduced from natural and anthropogenic sources. Many AHCs are well known for their toxic, carcinogenic, and mutagenic impact on human health and ecological systems. Biodegradation is an eco-friendly and cost-effective option operated with microorganisms (e.g., bacteria, f...

The short term effect of multiple air pollutants e.g. aerosols (black carbon, BC; PM2.5 and PM10) and trace gases (NO2, SO2, and O3) on all-cause mortality was systematically investigated in a typical urban pollution hotspot over central Indo-Gangetic Plain (IGP). To our knowledge, this would be the first report of mortality estimates for exposure...

Airborne transmission is one of the routes for the spread of COVID-19 which is caused by inhalation of smaller droplets containing CoV-2 (i.e., either virus-laden particulate matter: PM and/or aerosols or droplet nuclei) in an indoor environment. Notably, a significant fraction of the small droplets, along with respiratory droplets, is produced by...

Biochar is produced from pyrolysis of various kinds of biomass which are useful in several kind of applications including removal of environmental pollutants for enhancing quality of water and soil. This review conceptualizes the development and advancement of biochar-based treatment for abatement of organic compounds including agrochemicals (pesti...

In this work, Bacillus flexus GS1 IIT (BHU) as free and immobilized cells on low-density polyethylene (LDPE) were used to remove 4-Chlorophenol (4-CP) from the synthetic wastewater. The effect of the process variables, namely process time, pH, temperature, and 4-CP concentration, were optimized and obtained as 7.0 days, 7.0, 30 • C, and 50 mg/L, re...

Keywords: Acid orange 7 Polyurethane foam Packed bed bioreactor Response surface methodology Kinetic model A B S T R A C T The removal of Acid Orange 7 dye was studied in a packed bed bioreactor (PBBR) using bacterial consortium immobilized polyurethane foam (PUF) as packing material. The process variables such as pH, hydraulic retention time, and...

Size-segregated airborne fine (PM2.1) and coarse (PM>2.1) particulates were measured in an urban environment over central Indo-Gangetic plain in between 2015 and 2018 to get insights into its nature, chemistry and sources. Mean (±1σ) concentration of PM2.1 was 98(±76)µgm-3 with a seasonal high during winter (DJF, 162±71µgm-3) compared to pre-monsoo...