BioDigestX: A Nano-enhanced and IoT-integrated Biosink System for Domestic Kitchen Waste-to-biogas Conversion
J. Environ. Nanotechnol., Volume 15, No 1 (March 2026) pp. 358-366
Abstract
The increased volume of domestic kitchen waste and the growing demand for clean cooking energy require efficient decentralised waste-to-energy solutions. Anaerobic digestion is a viable way to convert organic waste to biogas, but there is a tendency to view conventional domestic digesters as low-efficiency, unstable, and producing low-quality gas. In this paper, the proposed system is BioDigestX, a nano-enhanced, biosink-based, and IoT-integrated anaerobic digestion system to convert household kitchen waste into biogas. The system combines waste segregation on the source level with the help of a biosink, anaerobic digestion with the use of iron oxide (Fe3O4) nanoparticles, and real-time monitoring of system parameters, temperature, pH, gas pressure, flow rate, and methane concentration using IoT. To test the performance of the systems, two domestic-scale reactors were operated under mesophilic conditions, with one serving as a standard control and the other as a nano-enhanced reactor. It was found that the nano-enhanced reactor became stable within 7-9 days, compared to 12-14 days for the control reactor. Biogas production was raised by 22-28% to reach 0.42-0.48 m3/day, with an average daily increase of 0.32-0.38 m3/day to 0.42-0.48 m3/day. The methane concentration increased to 62-68% in the nano-enhanced reactor, compared with 52-56% in the control system, and the carbon dioxide level decreased to 28-34%. The concentration of H2S was minimized to 40-50%, dropped to 90-140 ppm. The increased quality of biogas favoured 1.5-2.0 hours of domestic cooking. The findings indicate that the combined application of environmental nanotechnology and IoT can significantly improve the performance of domestic anaerobic digestion. BioDigestX system is a sustainable, scalable, and reliable system used in managing decentralized waste in kitchens and the generation of clean energy that can be used to support the ideas of the circular economy and the low-carbon household energy program.
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Reference
Abdella, A. A. K., Ibraheem, A. M. and Abd-Ellah, M. K., Forecasting of municipal solid waste multi-classification by using time-series deep learning depending on the living standard, Res. Eng., 16, 100655 (2022).
https://doi.org/10.1016/j.rineng.2022.100655
Adam, M. G., Tran, P. T. M., Bolan, N. and Balasubramanian, R., Biomass burning-derived airborne particulate matter in Southeast Asia: a critical review, J. Hazard. Mater., 407, 124760 (2021).
https://doi.org/10.1016/j.jhazmat.2020.124760
Alam, P., Sharholy, M., Khan, A. H., Ahmad, K., Alomayri, T., Radwan, N. and Aziz, A., Energy generation and revenue potential from municipal solid waste using system dynamic approach, Chemosphere, 299, 134351 (2022).
https://doi.org/10.1016/j.chemosphere.2022.134351
Alao, M. A., Popoola, O. M. and Ayodele, T. R., Projecting the energetic potential and economic viability of renewable power generation from municipal solid waste: indication from South African provinces, Energy Sustain. Dev., 71, 352–367 (2022).
https://doi.org/10.1016/j.esd.2022.10.010
Ambaye, T. G., Djellabi, R., Vaccari, M., Prasad, S., Aminabhavi, T. M. and Rtimi, S., Emerging technologies and sustainable strategies for municipal solid waste valorization: challenges of circular economy implementation, J. Clean. Prod., 423, 138708 (2023).
https://doi.org/10.1016/j.jclepro.2023.138708
Aswathi, V. P., Meera, S., Maria, C. G. A. and Nidhin, M., Green synthesis of nanoparticles from biodegradable waste extracts and their applications: a critical review, Nanotechnol. Environ. Eng., 8(2), 377-397(2022).
https://doi.org/10.1007/s41204-022-00276-8
Bahrulolum, H., Nooraei, S., Javanshir, N., Tarrahimofrad, H., Mirbagheri, V. S., Easton, A. J. and Ahmadian, G., Green synthesis of metal nanoparticles using microorganisms and their application in the agrifood sector, J. Nanobiotechnol., 19, 86 (2021).
https://doi.org/10.1186/s12951-021-00834-3
Baraketi, S. and Khwaldia, K., Nanoparticles from agri-food by-products: green technology synthesis and application in food packaging, Curr. Opin. Green Sustain. Chem., 49, 100953 (2024).
https://doi.org/10.1016/j.cogsc.2024.100953
Bhalerao, S., Patil, J., Bhatia, D. and Singh, N., Upcycling fruit waste: a sustainable route to nanoparticles synthesis and applications, ACS Food Sci. Technol., 5, 2563–2577 (2025).
https://doi.org/10.1021/acsfoodscitech.5c00458
Dhanker, R., Rawat, S., Chandna, V., Deepa, Kumar, R., Das, S., Sharma, A. and Kumar, V., Recovery of silver nanoparticles and management of food wastes: obstacles and opportunities, Environ. Adv., 9, 100303 (2022).
https://doi.org/10.1016/j.envadv.2022.100303
Krishnan, V., Asaithambi, M., Vishnupriyan, M., Bharathiyar, D., Selvaraj, D., Alaneme, G. U. and Rajesh, A., Remote sensing-based empirical modeling using Sentinel-1 for monitoring vegetation and agricultural dynamics in semi-arid areas, Environ. Sci. Eur., 38, 30 (2026).
https://doi.org/10.1186/s12302-025-01316-1
Krishnan, V., Rajesh, A., Selvaraj, D. et al. Analysing Soil Texture Variability with Clay and Sandy Fractions Derived from Synthetic Aperture Radar Data. J Indian Soc Remote Sens (2026).
https://doi.org/10.1007/s12524-025-02389-4
Krishnan, V. and Asaithambi, M., Hydro-meteorological aspects of soil fluorides in semi-arid soils using microwave remote sensing, Environ. Monitor. Assess., 196(7), 669 (2024).
https://doi.org/10.1007/s10661-024-12806-9
Krishnan, V. and Asaithambi, M., Semi-empirical SAR vegetation index for crop discrimination based on biomass in semi-arid region: A case study in Perambalur district, India, Remote Sens. Appli. Society Environ., 32, 101064 (2023).
https://doi.org/10.1016/j.rsase.2023.101064
Krishnan, V., Periasamy, S. and Ravi, K. P., Integrated SAR vegetation index for Rabi and Kharif crops, In IGARSS 2022 – 2022 IEEE Int. Geosci. Remote Sensing Symposium, 6406–6409 (2022).
https://doi.org/10.1109/IGARSS46834.2022.9884656
Liu, B., Han, B., Liang, X. and Liu, Y., Hydrogen production from municipal solid waste: potential prediction and environmental impact analysis, Int. J. Hydrog. Energy, 52, 1445–1456 (2024).
https://doi.org/10.1016/j.ijhydene.2023.11.027
Liu, Q., Sun, J., Meng, Z. and Zhong, W., Gasification characteristics of refuse derived fuels in a fluidized bed: effect of process parameters and catalytic reforming, J. Energy Inst., 111, 101435 (2023).
https://doi.org/10.1016/j.joei.2023.101435
Liu, Y., Ge, Y., Xia, B., Cui, C., Jiang, X. and Skitmore, M., Enhancing public acceptance towards waste-to-energy incineration projects: lessons learned from a case study in China, Sustain. Cities Soc., 48, 101582 (2019).
https://doi.org/10.1016/j.scs.2019.101582
Maalouf, A. and Mavropoulos, A., Re-assessing global municipal solid waste generation, Waste Manag. Res., 41, 936–947 (2022).
https://doi.org/10.1177/0734242X221074116
Mishra, K., Siwal, S. S., Nayaka, S. C., Guan, Z. and Thakur, V. K., Waste-to-chemicals: green solutions for bioeconomy markets, Sci. Total Environ., 887, 164006 (2023).
https://doi.org/10.1016/j.scitotenv.2023.164006
Mustafa, A. B., Dong, H., Zhang, C. and Fujii, M., Life cycle environmental benefit and waste-to-energy potential of municipal solid waste management scenarios in Indonesia, J. Mater. Cycles Waste Manage., 24, 1859–1877 (2022).
https://doi.org/10.1007/s10163-022-01441-6
Nemmour, A., Inayat, A., Janajreh, I. and Ghenai, C., Syngas production from municipal solid waste plasma gasification: a simulation and optimization study, Fuel, 349, 128698 (2023).
https://doi.org/10.1016/j.fuel.2023.128698
Nepal, M., Karki, A., Khadayat, M. S., Rai, R. K., Shyamsundar, P. and Somanathan, E., Low-cost strategies to improve municipal solid waste management in developing countries: experimental evidence from Nepal, Environ. Resour. Econ., 84, 729–752 (2023).
https://doi.org/10.1007/s10640-021-00640-3
Nukusheva, A., Rustembekova, D., Abdizhami, A., Au, T. and Kozhantayeva, Z., Regulatory obstacles in municipal solid waste management in Kazakhstan in comparison with the EU, Sustainability, 15(2), 1034 (2023).
https://doi.org/10.3390/su15021034
Muangjai, P., Wongsapai, W., Bunchuaidee, R., Tridech, N., Ritkrerkkrai, C., Damrongsak, D. and Bhuridej, O., Estimation of marginal abatement subsidization cost of renewable energy for power generation in Thailand, Energy Rep., 8, 528–535 (2022).
https://doi.org/10.1016/j.egyr.2022.05.197
Prabha, G. and Selvaraj, D., Sustainable synthesis of food-waste-derived nanoparticles for metabolic stimulation-driven enhancement of microbial PHB production, Biomass Convers. Biorefin., 14, 129–135 (2025).
https://doi.org/10.13074/jent.2025.12.2541854
Selvaraj, D. and Velvizhi, G., Ecological engineering system using floating macrophytes for the treatment of domestic wastewaters, ECS Trans., 107(1), 9763–9770 (2022).
https://doi.org/10.1149/10701.9763ecst
Selvaraj, D. and Velvizhi, G., Self-sustained semi-pilot scale hybrid eco-electrogenic engineered system for wastewater treatment and bioenergy generation, J. Water Process Eng., 51, 103474 (2023).
https://doi.org/10.1016/j.jwpe.2022.103474
Selvaraj, D. and Velvizhi, G., Sustainable ecological engineering systems for the treatment of domestic wastewater using emerging, floating, and submerged macrophytes, J. Environ. Manag., 286, 112253 (2021).
https://doi.org/10.1016/j.jenvman.2021.112253
Velvizhi, G., Balakumar, K. and Dharanidharan, S., Sequestering of CO2 to Value-Added Products through Various Biological Processes, Next Gener. Biomanuf. Technol., 1329, 261–284 (2019).
https://doi.org/doi:10.1021/bk-2019-1329.ch012
Yin, Z., Cui, C., Chen, H., Yu, X. and Qian, W., The application of carbon nanotube/graphene-based nanomaterials in wastewater treatment, Small, 16, e1902301 (2020).
