Projects and Publications

Active Projects

Integrated Hydrothermal Liquefaction of Mixed Waste Streams for Sustainable Biocrude Production

Funded by: ANRF

Duration: 2026-2029

Production of high-quality black pellets for biomass thermal conversion applications using steam explosion and leaching

Funded by: IIT Gandhinagar

Duration: 2026-2029

Publications

Journal Publications

1. Samal, B., Singhal, A*#., Kuila, S. K., Konttinen, J., Joronen, T., & Dubey, B. (2026). Combined leaching and steam explosion pretreatment for producing high-quality black pellet from low-grade biomass residues. Renewable Energy. DOI: https://doi.org/10.1016/j.renene.2026.125749

2. Singhal, A*., Roslander, C., Goel, A., Ismailov, A., Erdei, B., Wallberg, O., Konttinen, J. and Joronen, T. (2024). Combined leaching and steam explosion pretreatment of lignocellulosic biomass for high quality feedstock for thermochemical applications. Chemical Engineering Journal, Vol. 489, June 2024. DOI: https://doi.org/10.1016/j.cej.2024.151298

3. Singhal, A*., Goel, A., Bhatnagar, A., Roslander, C., Wallberg, O., Konttinen, J., & Joronen, T. (2023). Improving inorganic composition and ash fusion behavior of spruce bark by leaching with water, acetic acid, and steam pre-treatment condensate. Chemical Engineering Journal, Vol. 452 (2), January 2023. DOI: https://doi.org/10.1016/j.cej.2022.139351

4. Bhatnagar, A*., Singhal, A., Tolvanen, H., Valtonen, K., Joronen, T., Konttinen, J. (2022). Effect of pretreatment and biomass blending on bio-oil and biochar quality from two-step slow pyrolysis of rice straw. Waste Management, Vol. 138, February 2022. DOI: https://doi.org/10.1016/j.wasman.2021.12.013

5. Singhal, A*., Gupta, A. K., Dubey, B., & Ghangrekar, M. M. (2021). Seasonal characterization of municipal solid waste for selecting feasible waste treatment technology for Guwahati city, India. Journal of the Air & Waste Management Association, Vol. 72 (2), December 2021. DOI: https://doi.org/10.1080/10962247.2021.1980450

6. Singhal, A*., Goossens, M., Fantozzi, D., Raiko, A., Konttinen, J., & Joronen, T. (2021). Step washing: A modified pretreatment approach for industrial applications to improve chemical composition of agricultural residues. Bioresource Technology, Vol. 341, December 2021. DOI: https://doi.org/10.1016/j.biortech.2021.125753

7. Singhal, A*., Goossens, M., Konttinen, J., & Joronen, T. (2021). Effect of basic washing parameters on the chemical composition of empty fruit bunches during washing pretreatment: A detailed experimental, pilot, and kinetic study. Bioresource Technology, Vol. 340, November 2021. DOI: https://doi.org/10.1016/j.biortech.2021.125734

8. Singhal, A*., Konttinen, J., & Joronen, T. (2021). Effect of different washing parameters on the fuel properties and elemental composition of wheat straw in water-washing pre-treatment. Part 1: Effect of washing duration and biomass size. Fuel, Vol. 292, May 2021. DOI: https://doi.org/10.1016/j.fuel.2021.120206

9. Singhal, A*., Konttinen, J., & Joronen, T. (2021). Effect of different washing parameters on the fuel properties and elemental composition of wheat straw in water-washing pre-treatment. Part 2: Effect of washing temperature and solid-to-liquid ratio. Fuel, Vol. 292, May 2021. DOI: https://doi.org/10.1016/j.fuel.2021.120209

10. Singhal, A., Goel, S*., & Sengupta, D. (2020). Physicochemical and elemental analyses of sandstone quarrying wastes to assess their impact on soil properties. Journal of Environmental Management, Vol. 271, October 2020. DOI: https://doi.org/10.1016/j.jenvman.2020.111011

* Corresponding author #Shared first author

Book Chapters

1. Singhal, A*., & Dubey, B. (2024). A Simple Approach for Designing a Waste Collection System for Guwahati City Using Google Earth. In Advances in Solid and Hazardous Waste Management (2nd Ed.) (pp. 131-152). Springer, Cham. May 2024. DOI: https://doi.org/10.1007/978-3-031-49144-3_9

2. Singhal, A., & Goel, S. (2022). An integrated solid waste management (ISWM) plan using Remote Sensing, GIS and Linear programming for Kharagpur, West Bengal. In Treatment and disposal of solid and hazardous wastes (pp. 159-183). Springer, Cham. March 2022. DOI: https://doi.org/10.1007/978-3-030-29643-8_8

3. Singhal, A., & Goel, S. (2022). Impact of sandstone quarrying on the health of quarry workers and local residents in Keru, Jodhpur, India. In Treatment and disposal of solid and hazardous wastes (pp. 97-118). Springer, Cham. March 2022. DOI: https://doi.org/10.1007/978-3-030-29643-8_5

4. Singhal, A., & Goel, S. (2021). Spatio-temporal Analysis of Open Waste Dumping Sites Using Google Earth: A Case Study of Kharagpur City, India. In Spatial Modeling and Assessment of Environmental Contaminants (pp. 137-151). Springer, Cham. February 2021. DOI: https://doi.org/10.1007/978-3-030-63422-3_9

Conference Paper

Singhal, A., Goel, A., Bhatnagar, A., Konttinen, J., & Joronen, T. (2022). Water Leaching Pre-Treatment of Different Lignocellulosic Biomass: A Detailed Study on Process Parameters, Kinetics, Thermodynamic Equilibrium Modelling, and Pyrolysis Product Yields. In The proceedings of 9th international symposium on energy from biomass and waste, Venice, Italy. CISA Publisher.
Singhal, A., Agarwal, V., Konttinen, J., & Joronen, T. (2022). Leaching pretreatment of agricultural residues: Effect of basic parameters, leaching kinetics and industrial applicability. In Young Energy Researchers, World Sustainable Energy Days 2022, Linz, Austria.
Singhal, A., Madhnure, K., Dubey, B. K., & Goel, S. (2021). Application of Google Earth in Solid Waste Management: For Developing Waste Management Plan and Studying Waste Dumpsites. In 18th International Symposium on Waste Management and Sustainable Landfilling, Sardinia, Italy. CISA Publisher.
Singhal, A., & Goel, S. Environmental Impacts of Sandstone Quarrying and Its Waste: A Case Study of Jodhpur, India. 35th International Conference on Solid Waste Technology and Management, Widener University, USA (ISSN 1091-8043).

Conference and Poster Presentations

Singhal, A. (2026). Combined Leaching and Steam Explosion Pretreatment for Producing High-Quality Black Pellets for Thermochemical Applications. 34th European Biomass Conference and Exhibition EUBCE 2025, The Hague, Netherlands. (Session Chair(s) and Oral presentation)
Singhal, A. (2026). Different Pretreatment approaches to produce high-quality solid biofuels from low-grade biomass for thermochemical applications. International Conference on Energy and Resource Recovery for Sustainable Circular Economy 2026, IIT Madras, India. (Keynote speaker and Session Chair)
Singhal, A., Samal, B., Kuila, S. K., Konttinen, J., Joronen, T., & Dubey, B. (2026). Integrated Washing and Steam Explosion Pretreatment for making High-Quality Biomass Pellets for Thermochemical Conversion. National Environmental Conference (NEC - 2026), IIT Bombay, India (Session Chair and Oral presentation)***
Singhal, A., Wray, H., Luzzi, S., Meijden, C., Nanou, P (2025). Life Cycle Assessment of an Integrated Mild Hydrothermal Carbonization (TORWASH®) System for Sewage Sludge Valorisation. 33rd European Biomass Conference and Exhibition EUBCE 2025, Valencia, Spain. (Poster Presentation)
Singhal, A., Goel, A., Roslander, C., Wallberg, O., Konttinen, J., & Joronen, T. (2023). Combined leaching and steam explosion pretreatment for improving fuel quality of biomass. 31st European Biomass Conference and Exhibition EUBCE 2023, Bologna, Italy. (Oral Presentation)
Singhal, A., Goel, A., Bhatnagar, A., Konttinen, J., & Joronen, T. (2022). Water leaching pre-treatment for different lignocellulosic biomass: A detailed study on process parameters, kinetics, thermodynamic equilibrium modelling, and pyrolysis product yield. 10th Finnish Flame Days 2023, Tampere, Finland. (Oral Presentation)
Singhal, A., Bhatnagar, A., Konttinen, J., & Joronen, T. (2022). Effectiveness of different water leaching pre-treatment approaches on biomass fuel composition, leaching kinetics, combustion properties, and pyrolysis product yield. 30th European Biomass Conference and Exhibition EUBCE 2022. (Online Oral Presentation)
Singhal, A., Goel, A., Bhatnagar, A., Konttinen, J., & Joronen, T. (2022). Water Leaching Pre-Treatment of Different Lignocellulosic Biomass: A Detailed Study on Process Parameters, Kinetics, Thermodynamic Equilibrium Modelling, and Pyrolysis Product Yields. VENICE2022 - 9th International Symposium on Energy from Biomass and Waste, Venice, Italy. (Oral Presentation)
Singhal, A., Agarwal, V., Konttinen, J., & Joronen, T. (2022). Leaching pretreatment of agricultural residues: Effect of basic parameters, leaching kinetics and industrial applicability. Young Energy Researchers, World Sustainable Energy Days WSED 2022, Linz, Austria. (Oral Presentation)
Singhal, A., Konttinen, J., Joronen, T., & Goossens, M. (2021). Effect of different type of water washing pretreatment on the fuel properties and elemental composition of wheat straw and oil palm empty fruit bunches. 3rd International Conference for Bioresource Technology for Bioenergy, Bioproducts & Environmental Sustainability, Elsevier. (Online Poster presentation)***
Singhal, A., Dubey, B. K. (2021). Design of Municipal Solid Waste Storage and Collection system using Google Earth and Google Maps. International Conference on Resource Sustainability icRS 2021, University College Dublin, Ireland. (Online Oral Presentation)
Singhal, A., Goel, S. (2018). An integrated solid waste management plan for Kharagpur City using remote sensing, GIS and linear optimization. International Conference on Resource Sustainability, Beijing Normal University, China. (Oral Presentation)***
Singhal, A., Goel, S. (2018). Impact of sandstone quarrying on the health of quarry workers and local residents: A case study of Jodhpur, India. International Conference on Resource Sustainability, Beijing Normal University, China. (Oral Presentation)***
Singhal, A., Goel, S. (2017). Design of integrated solid waste management plan for Kharagpur City using Google Earth. International conference of solid waste management, NEERI Nagpur, India. (Oral Presentation)***
Singhal, A., Goel, S. (2017). Application of remote sensing and geographical information system in solid waste management. 10th International Conference on Theory and Practice of E-Governance, organized by Government of India, UNESCO and the United Nations, New Delhi, India. (Oral Presentation)

*** Won best paper or poster presentation award in the conference

Workshop and Invited Lecture

Invited as an expert for panel discussion on “National Brainstorming Workshop on Solid Waste Management and Circular Economy” organised by CSIR-NEERI, Nagpur, India (8-9 Jan 2026).
Deliver an Invited lecture at Department of Chemical engineering, IIT Madras, India (15th Dec 2025) on “Different Pretreatment approaches to produce high-quality biofuels from low-grade biomass for thermochemical applications” .
Attended Workshop on “Workshop on Gainful Utilization of Marble Slurry and other Stone Wastes” organized by Centre for Development of Stones (CDOS), India (July 2017, in Jaipur, India)
Attended Workshop on “SMART CITIES: Sustainable Urban Development” Jointly Organized by Heidelberg University, Observer Research Foundation (ORF), Indo-German Chamber of Commerce and IIT Kharagpur (November 2018, in Kolkata, India)
Attended Workshop on “How to Write and Publish Scientific Articles and Manuscripts” Jointly Organized by Springer, Nature and IIT Kharagpur (February 2018, in IIT Kharagpur, India)

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