Conference Presentations by Dr. Dolly Kumari
IEEE Region 10 Humanitarian Technology Conference 2016, R10-HTC 2016 Proceedings , 2017
Biohydrogen production has gained attention in recent years using anaerobic degradation method. I... more Biohydrogen production has gained attention in recent years using anaerobic degradation method. In the present study, Benincasa hispida (petha) solid waste generated from industries were used as substrate. Three different inoculum namely, cow dung (CD), goat dung (GD) and pretreated soil (SP) were used as a bacterial source. They were used separately and also in combination of two cultures in equal ratio. The cultures then mixed with petha waste slurry in 20:80 in batch reactor of 500 mL with a working volume of 400 mL under anaerobic conditions. Substrate used in the present study had chemical oxygen demand and glucose concentration of 3150 mg/L and 11 mg/L respectively. Biohydrogen was found to be maximum in GD+CD (87%) used as the bacterial inoculum. Acetic acid was also estimated and a maximum concentration of 2650 ppm was found in the reactor operated using GD as bacterial source. Degradation in various parameters was also studied in terms of COD, glucose.
Papers by Dr. Dolly Kumari
agricultural crop wastes: A review in context to second generation of biofuel production".
Coupled Pretreatment of Rice Straw with Dairy Wastewater and Ultrasonication for Biofuel Production Using Mixed Microbial Source
An overview of E-waste generation and management strategies in metro cities of India
Elsevier eBooks, 2023
A global glance on waste electrical and electronic equipments (WEEEs)
Elsevier eBooks, 2023
Energies
Waste rice straw biomass and its burning in open fields have become a serious issue of greenhouse... more Waste rice straw biomass and its burning in open fields have become a serious issue of greenhouse gases emission and air pollution, which has a negative impact on public health and the environment. However, the environmental impact of burning this agro-waste can be mitigated by diverting it towards green biorefinery through the sustainable production of energy, biofuels, organic chemicals, and building blocks for various polymers. This will not only help to reduce the reliance on limited fuels and various chemicals derived from petroleum, but also help in the restoration of the environment in a sustainable manner through its complete utilization. To maximize the inherent conversion potential of rice straw biomass into valuable products, this agriculture waste biomass requires a comprehensive analysis and a techno-economic review for its sustainable management. This review article focuses on the sustainable management of rice straw waste biomass via innovative valorization approaches...
International Journal of Plant, Animal and Environmental Sciences, 2021
In present a large variety of effluents is available which is the result of exhaustive use of fre... more In present a large variety of effluents is available which is the result of exhaustive use of fresh water forms and human activities. The energy generation from carbohydrate rich effluents is a very fruitful approach in the present era when energy demand is enhancing day by day with population growth. Domestic as well as industrial discharge is taking place of fresh water in water resources like rivers, lakes, ponds etc. because of lack of recycling and mixing of drained water to fresh water resources. Various methods and technologies are in use for energy recovery from effluents but most of them are expensive due to high energy consumption or use of expensive chemicals and instruments in the recovery process. This review deals with methods
Enhanced Biofuel Production from Lignocellulosic Biomass: An Overview of Advanced Physico-Chemical and Biological Technologies
Recent Advances in Bioremediation of Wastewater for Sustainable Energy Products
Zero Waste, 2019
A study on green pretreatment of rice straw using Petha wastewater and Mausami waste assisted with microwave for production of ethanol and methane
Energy Conversion and Management: X, 2021
Abstract The present work proposes a new and novel pretreatment of rice straw (RS) using petha wa... more Abstract The present work proposes a new and novel pretreatment of rice straw (RS) using petha wastewater (PWW) and mausami waste (MW) for its conversion to ethanol and methane. This approach is an example of waste-to-waste pretreatment. The organic matter present in the RS has been utilized as the source for biofuel production by the action of the anaerobes present in the microbial culture utilized (cow dung). To enhance the production of biofuel, chemical and green pretreatment methods were compared with respect to solubilisation of the lignocellulosic content into reducible sugars. Maximum glucose release (292Â mg/L) was obtained for 2% NaOH pretreated RS followed by PWW pretreatment (198Â mg/L). Further 5Â min. microwave pretreatment in addition to the above pretreatment methods were also used to enhance the glucose release for production of ethanol and methane. All reactors were operated for two batch runs. The maximum bioethanol yield was 28.75Â mg/L (1150Â mg/kgRS) for PWW and microwave pretreated RS and methane yield was 11.86% of total gas produced for PWW pretreated RS respectively. This study is based on preliminary experiments on RS with microwave assisted PWW and MW pretreatment for ethanol and methane production.
Environmental and Sustainability Indicators, 2019
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Renewable Energy, 2019
The present study describes a novel green approach of waste to energy generation without use of a... more The present study describes a novel green approach of waste to energy generation without use of any chemical in the pretreatment process. Lignocellulosic waste Rice Straw (RS) was taken as substrate and petha waste water (PWW) was used for the pretreatment of RS. Cow dung (CD) and soil were used as mixed microbial sources. Eight different batch reactors were set up with CD and soil as
Renewable and Sustainable Energy Reviews, 2018
Protection of environment is of immediate concern and this can only be achieved by avoiding the u... more Protection of environment is of immediate concern and this can only be achieved by avoiding the use of chemicals for fuel production. Lignocellulosic waste is becoming popular as a feedstock for biofuel production. The can be converted into usable form for biofuel production by using a suitable pretreatment method. Different pretreatment methods have been used by researchers which are physical, chemical, physico-chemical, biological and combined pretreatments. Evidently chemical pretreatment is found to be more expensive as a large amount of chemicals are used for pretreating the lignocellulosic substrate. It has been shown that combined pretreatments are more effective as compared to single pretreatment and there is an extensive scope of combinations which can also be applied in future. Recent review critically discusses and compares different pretreatment methods, biomass resources, chemical composition of different agricultural biomass and the use of this biomass for bioenergy generation. Various pretreatment processes used for bio-hydrogen, bio-methane, bio-ethanol, biomethanol bio-butanol and bio-diesel production are also discussed.
Effect of different microbial culture on biohydrogen production from Benincasa hispida waste
2016 IEEE Region 10 Humanitarian Technology Conference (R10-HTC), 2016
Biohydrogen production has gained attention in recent years using anaerobic degradation method. I... more Biohydrogen production has gained attention in recent years using anaerobic degradation method. In the present study, Benincasa hispida (petha) solid waste generated from industries were used as substrate. Three different inoculum namely, cow dung (CD), goat dung (GD) and pretreated soil (SP) were used as a bacterial source. They were used separately and also in combination of two cultures in equal ratio. The cultures then mixed with petha waste slurry in 20:80 in batch reactor of 500 mL with a working volume of 400 mL under anaerobic conditions. Substrate used in the present study had chemical oxygen demand and glucose concentration of 3150 mg/L and 11 mg/L respectively. Biohydrogen was found to be maximum in GD+CD (87%) used as the bacterial inoculum. Acetic acid was also estimated and a maximum concentration of 2650 ppm was found in the reactor operated using GD as bacterial source. Degradation in various parameters was also studied in terms of COD, glucose.
Scientific Reports
Energy efficient and environment friendly pretreatment processes for the production of biofuel ha... more Energy efficient and environment friendly pretreatment processes for the production of biofuel have remained elusive and the research is further compounded by the high cost of processing lignocellulosic biomass—an essential factor for producing sustainable biofuels. In the last few decades, a number of pretreatment methods have been proposed, specifically chemical pretreatments but are either expensive or harmful to the environment. To address this urgent need, we propose a green pretreatment method that utilises the highly alkaline by-product, petha wastewater to pretreat the lignocellulosic waste rice straw (RS). The effectiveness of the pretreatment was analysed by monitoring both enhanced cellulose content and reducing sugar yield along with removal of hemicellulose and lignin. We found that PWW pretreatment yielded five times more reducing sugar than native RS with 10.12% increment in cellulose content. SEM and EDX studies further revealed that our process enhanced surface roug...
Scientific Reports, 2022
Energy efficient and environment friendly pretreatment processes for the production of biofuel ha... more Energy efficient and environment friendly pretreatment processes for the production of biofuel have remained elusive and the research is further compounded by the high cost of processing lignocellulosic biomass—an essential factor for producing sustainable biofuels. In the last few decades, a number of pretreatment methods have been proposed, specifically chemical pretreatments but are either expensive or harmful to the environment. To address this urgent need, we propose a green
pretreatment method that utilises the highly alkaline by-product, petha wastewater to pretreat the lignocellulosic waste rice straw (RS). The effectiveness of the pretreatment was analysed by monitoring both enhanced cellulose content and reducing sugar yield along with removal of hemicellulose and lignin. We found that PWW pretreatment yielded five times more reducing sugar than native RS with 10.12% increment in cellulose content. SEM and EDX studies further revealed that our process enhanced surface roughness and carbon content (from 32.19% increased to 41.59% and 41.66% for A and D, respectively) along with reduction in silica content (from 8.68% in RS to 4.30% and 7.72% for A and D, respectively). XRD and FTIR analyses indicate crystallinity index (CI) and
alteration in lignocellulosic structure of RS, respectively. Decrease in CI was about 43.4% in A whereas only 4.5% in D as compared to native RS (CI 54.55%). Thereby we found PWW to be better substitute of an alkali for pretreatment of RS with negligible environmental impacts.
International Journal of Plant Animal and Environmental Sciences, 2021
In present a large variety of effluents is available which is the result of exhaustive use of fre... more In present a large variety of effluents is available which is the result of exhaustive use of fresh water forms and human activities. The energy generation from carbohydrate rich effluents is a very fruitful approach in the present era when energy demand is
Energy Conversion and Management X, 2021
The present work proposes a new and novel pretreatment of rice straw (RS) using petha wastewater ... more The present work proposes a new and novel pretreatment of rice straw (RS) using petha wastewater (PWW) and mausami waste (MW) for its conversion to ethanol and methane. This approach is an example of waste-to-waste pretreatment. The organic matter present in the RS has been utilized as the source for biofuel production by the action of the anaerobes present in the microbial culture utilized (cow dung). To enhance the production of biofuel, chemical and green pretreatment methods were compared with respect to solubilisation of the lignocellulosic content into reducible sugars. Maximum glucose release (292 mg/L) was obtained for 2% NaOH pretreated RS followed by PWW pretreatment (198 mg/L). Further 5 min. microwave pretreatment in addition to the above pretreatment methods were also used to enhance the glucose release for production of ethanol and methane. All reactors were operated for two batch runs. The maximum bioethanol yield was 28.75 mg/L (1150 mg/kg RS) for PWW and microwave pretreated RS and methane yield was 11.86% of total gas produced for PWW pretreated RS respectively. This study is based on preliminary experiments on RS with microwave assisted PWW and MW pretreatment for ethanol and methane production.
Environmental and Sustainability Indicators, 2020
The present study describes a novel method in which petha wastewater (PWW) and rice straw (RS) we... more The present study describes a novel method in which petha wastewater (PWW) and rice straw (RS) were pretreated symbiotically to improve the quality of both wastes. This pretreatment helped in lignocellulosic degradation of RS, which can easily undergo anaerobic digestion (AD) for biofuel production. pH and alkalinity of PWW was reduced within limits after pretreatment and amount of soluble sugars of RS also increased significantly. Hence we can kill two birds with one stone i.e. solve disposal problem of highly alkaline PWW and RS simultaneously. Saccharification of RS took place which can then be easily biodegradable anaerobically. Percent increase in cellulose was 9.62% whereas percent decrease in hemicellulose and lignin were 7.23% and 8.88% respectively with respect to untreated RS. pH of PWW was reduced from 12 to 6.4 and calcium carbonate alkalinity was completely reduced to null value from initial value of 2400 mg/L. Structural changes like roughness and porosity are shown in SEM images for both untreated and PWW pretreated RS.
Renewable Energy, 2020
The present study describes a novel green approach of waste to energy generation without use of a... more The present study describes a novel green approach of waste to energy generation without use of any chemical in the pretreatment process. Lignocellulosic waste Rice Straw (RS) was taken as substrate and petha waste water (PWW) was used for the pretreatment of RS. Cow dung (CD) and soil were used as mixed microbial sources. Eight different batch reactors were set up with CD and soil as microbial sources separately. These reactors contained PWW pretreated RS which was ultrasonicated for 5, 10 and 15 min for three separate reactors and the fourth reactor was set up without ultrasonication. Methane was analysed by gas chromatograph (GC) equipped with thermal conductivity detector (TCD) and ethanol was analysed using chromic acid method by UVeVisible spectrophotometer (584 nm). Various physical parameters like COD degradation, pH, TS, TDS, TSS, VS were also analysed as per standard methods to check the feasibility of the process. Maximum methane yield was 47.8% with soil culture and maximum ethanol yield was 126.53 mg/L with CD, in the reactors with 15 min ultrasonication of RS and PWW. The methane and ethanol yields were about three times and two times more than that of reactors without ultrasonication with soil and CD respectively.
Uploads
Conference Presentations by Dr. Dolly Kumari
Papers by Dr. Dolly Kumari
pretreatment method that utilises the highly alkaline by-product, petha wastewater to pretreat the lignocellulosic waste rice straw (RS). The effectiveness of the pretreatment was analysed by monitoring both enhanced cellulose content and reducing sugar yield along with removal of hemicellulose and lignin. We found that PWW pretreatment yielded five times more reducing sugar than native RS with 10.12% increment in cellulose content. SEM and EDX studies further revealed that our process enhanced surface roughness and carbon content (from 32.19% increased to 41.59% and 41.66% for A and D, respectively) along with reduction in silica content (from 8.68% in RS to 4.30% and 7.72% for A and D, respectively). XRD and FTIR analyses indicate crystallinity index (CI) and
alteration in lignocellulosic structure of RS, respectively. Decrease in CI was about 43.4% in A whereas only 4.5% in D as compared to native RS (CI 54.55%). Thereby we found PWW to be better substitute of an alkali for pretreatment of RS with negligible environmental impacts.
pretreatment method that utilises the highly alkaline by-product, petha wastewater to pretreat the lignocellulosic waste rice straw (RS). The effectiveness of the pretreatment was analysed by monitoring both enhanced cellulose content and reducing sugar yield along with removal of hemicellulose and lignin. We found that PWW pretreatment yielded five times more reducing sugar than native RS with 10.12% increment in cellulose content. SEM and EDX studies further revealed that our process enhanced surface roughness and carbon content (from 32.19% increased to 41.59% and 41.66% for A and D, respectively) along with reduction in silica content (from 8.68% in RS to 4.30% and 7.72% for A and D, respectively). XRD and FTIR analyses indicate crystallinity index (CI) and
alteration in lignocellulosic structure of RS, respectively. Decrease in CI was about 43.4% in A whereas only 4.5% in D as compared to native RS (CI 54.55%). Thereby we found PWW to be better substitute of an alkali for pretreatment of RS with negligible environmental impacts.