1. *Nabaterega, R., *Vesuwe, R,N., Iorhemen, O.T., Thring, R.W. (2026) Biodiesel production unpacked: Data-driven analysis of key operational factors. Biomass and Bioenergy. Article reference: JBB_108457.  https://doi.org/10.1016/j.biombioe.2025.108457.
  2. *Adekunle, A., *Nabaterega, R., dos Santos, A.B., Iorhemen, O.T. (2025). Engineering aerobic granular sludge for enhanced curdlan biosynthesis: the impact of organic loading rate, carbon-to‑nitrogen ratio, and feeding strategy. Bioresource Technology Reports. 32: 102309. https://doi.org/10.1016/j.biteb.2025.102309
  3. Frutuoso, F.K.A., da Silva Xavier, R., Passos, E.S., Iorhemen, O., dos Santos, A. B. (2025). New insights into the recovery of microbial gums and other bioresources in aerobic granular systems with and without photogranulation and metal ions. Chemical Engineering Journal. 523: 168582. https://doi.org/10.1016/j.cej.2025.168582
  4. *Kaur, M., *Vesuwe, R.N., dos Santos, A.B., Morgan, K.D., Iorhemen, O.T. (2025) Enhancing xanthan biosynthesis in AGS for resource recovery: the role of organic loading rate, carbon-to-nitrogen ratio, and feeding strategy. Cleaner Water. 4: 100111. https://doi.org/10.1016/j.clwat.2025.100111
  5. *Nabaterega, R., *Vesuwe, R.N., Iorhemen, O.T. (2025) Statistical evaluation of different filter media and application of multiple criteria analysis to select the best media for pollutants removal in wastewater biofiltration: A review. Science of the Total Environment. 996: 180104. https://doi.org/10.1016/j.scitotenv.2025.180104
  6. *Vesuwe, R.N., *Nabaterega, R., Ukaigwe, S., Iorhemen, O.T. (2025) A systematic review of nitrogen removal pathways in membrane aerated biofilm reactor (MABR) systems. Journal of Water Process Engineering. 74: 107758. https://doi.org/10.1016/j.jwpe.2025.107758
  7. *Ali, A. A., Iorhemen, O. T., Thring, R. W. (2025). Climate adaptation and resilience of biofiltration as a low-cost technological solution for water treatment–A critical review. Cleaner Water, 3, 100062. https://doi.org/10.1016/j.clwat.2024.100062
  8. *Mohammadpour, M., Ukaigwe, S., Manga, M., Iorhemen, O.T. (2025). Valorization of waste aerobic granular sludge: exploring the recovery of tyrosine, phenylalanine, and other high-value products. Cleaner Chemical Engineering Volume, 11,100144. https://doi.org/10.1016/j.clce.2024.100144
  9. *Odoom, J., Iorhemen, O.T. Li, J. (2025). Advances in adsorption for oily wastewater treatment: eco-friendly adsorbents and analytical insights. Energy, Ecology and Environment, 10, 15–44. https://doi.org/10.1007/s40974-024-00332-w
  10. *Kaur, M., Guo, B., Iorhemen, O. T. (2024). Potential for the recovery of xanthan from aerobic granular sludge wastewater systems–A review. Resources, Conservation and Recycling, 207, 107688. https://doi.org/10.1016/j.resconrec.2024.107688
  11. *Adekunle, A., Ukaigwe, S., Bezerra dos Santos, A., Iorhemen, O. T. (2024). Potential for curdlan recovery from aerobic granular sludge wastewater treatment systems – A review. Chemosphere, 362, 142504. https://doi.org/10.1016/j.chemosphere.2024.142504
  12. *Soliman, R., Hamza, R. A., Iorhemen, O. T. (2024). Biofilm-based hybrid systems for enhanced brewery wastewater treatment – A review. Journal of Water Process Engineering, 58, 104763. https://doi.org/10.1016/j.jwpe.2023.104763
  13. Iorhemen, O. T., Ukaigwe, S. (2023). Biorefinery Paradigm in Wastewater Management: Opportunities for Resource Recovery from Aerobic Granular Sludge Systems. In R. Gupta, M. Sun, S. Brzev, M. S. Alam, K. T. W. Ng, J. Li, A. El Damatty, & C. Lim (Eds.), Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 (pp. 1319–1334). Springer International Publishing. https://doi.org/10.1007/978-3-031-34593-7_84
  14. Muoghalu, C. C., Owusu, P. A., Lebu, S., Nakagiri, A., Semiyaga, S., Iorhemen, O. T., Manga, M. (2023) Biochar as a novel technology for treatment of onsite domestic wastewater: A critical review. Front. Environ. Sci. 11, 1095920.
  15. Iorhemen, O.T., Ukaigwe, S., Dang, H., Liu, Y. (2022) Phosphorus removal from aerobic granular sludge: proliferation of polyphosphate-accumulating organisms (PAOs) under different feeding strategies. Processes. 10(7), 1399.
  16. Hamza, R., Rabii, A., Ezzahraoui, F.-Z, Morgan, G., Iorhemen, O.T. (2022) A review of the state of development of aerobic granular sludge technology over the last 20 years: Full-scale applications and resource recovery. Case Studies in Chemical and Environmental Engineering. 5: 100173.
  17. Iorhemen, O.T., Liu, Y. (2021) Effect of feeding strategy and organic loading rate on the formation and stability of aerobic granular sludge. Journal of Water Process Engineering. 39: 1017099.
  18. Zaghloul, M.S., Iorhemen, O.T., Hamza, R.A., Tay, J.H., Achari, G. (2021) Development of an ensemble of machine learning algorithms to model aerobic granular sludge reactors. Water Research. 189: 116657.
  19. Zaghloul, M.S., Hamza, R.A., Iorhemen, O.T., Tay, J.H. (2020) Comparison of adaptive neuro-fuzzy inference systems (ANFIS) and support vector regression (SVR) for data-driven modelling of aerobic granular sludge reactors. Journal of Environmental Chemical Engineering. 8(3): 103742.
  20. Iorhemen, O.T., Zaghloul, M.S., Hamza, R.A., Tay, J.H. (2020) Long-term aerobic granular sludge stability through anaerobic slow feeding, fixed feast-famine period ratio, and fixed SRT. Journal of Environmental Chemical Engineering. 8(2): 103681.
  21. Iorhemen, O.T., Hamza, R.A., Zaghloul, M.S., and Tay, J.H. (2019) Aerobic granular sludge membrane bioreactor (AGMBR): Extracellular polymeric substances (EPS) analysis. Water Research. 156: 305-314.
  22. Iorhemen, O.T., Hamza, R.A., Sheng, Z., and Tay, J.H. (2019) Submerged aerobic granular sludge membrane bioreactor (AGMBR): Organics and nutrients (nitrogen and phosphorus) removal. Bioresource Technology Reports. 6: 260-267.
  23. Vashi, H., Iorhemen, O.T., Tay, J.H. (2019) Extensive studies on the treatment of pulp mill wastewater using aerobic granular sludge (AGS) technology. Chemical Engineering Journal. 359: 1175-1194.
  24. Hamza, R.A., Zaghloul, M.S., Iorhemen, O.T., Sheng, Z., and Tay, J.H. (2019) Optimization of organics to nutrients (COD:N:P) ratio for aerobic granular sludge treating high-strength organic wastewater. Science of the Total Environment. 650 (part 2): 3168-3179.
  25. Tiwari, S.S., Iorhemen, O.T., Tay, J.H. (2019) Aerobic granular sludge and naphthenic acids treatment by varying initial concentrations and supplemental carbon concentrations. Journal of Hazardous Materials. 362: 348-357.
  26. Hamza, R.A., Sheng, Z., Iorhemen, O.T., Zaghloul, M.S., and Tay, J.H. (2018) Impact of food-to-microorganisms ratio on the stability of ‎aerobic granular sludge treating high-strength organic ‎wastewater. Water Research. 147: 287-298.
  27. Vashi, H., Iorhemen, O.T., Tay, J.H. (2018) Degradation of industrial tannin and lignin from pulp mill effluent by aerobic granular sludge technology. Journal of Water Process Engineering. 26: 38 – 45.
  28. Zaghloul, M.S., Hamza, R.A., Iorhemen, O.T., Tay, J.H. (2018) Performance prediction of an aerobic granular SBR using modular multilayer artificial neural networks. Science of the Total Environment. 645: 449 – 459.
  29. Tiwari, S.S., Iorhemen, O.T., Tay, J.H. (2018) Semi-continuous treatment of naphthenic acids using aerobic granular sludge. Bioresource Technology Reports. 3: 191-199.
  30. Hamza, R.A., Iorhemen, O.T., Zaghloul, M.S., Tay, J.H. (2018) Rapid formation and characterization of aerobic granules in pilot-scale sequential batch reactor for high-strength organic wastewater treatment. Journal of Water Process Engineering. 22: 27 – 33.
  31. Vashi, H., Iorhemen, O.T., Tay, J.H. (2018). Aerobic granulation: a recent development on the biological treatment of pulp and paper wastewater. Environmental Technology & Innovation. 9: 265-274.
  32. Iorhemen, O.T., Hamza, R.A., Zaghloul, M.S., Tay, J.H. (2018). Simultaneous organics and nutrients removal in side-stream aerobic granular sludge membrane bioreactor (AGMBR). Journal of Water Process Engineering. 21: 127–132.
  33. Iorhemen, O.T., Hamza, R.A., Tay, J.H. (2017). Membrane fouling control in membrane bioreactors (MBRs) using granular materials. Bioresource Technology. 240(2): 9 – 24.
  34. Iorhemen, O.T., Hamza, R.A., Tay, J.H. (2017). Utilization of aerobic granulation to mitigate membrane fouling in MBRs. Membrane Water Treatment. 8(5): 395 – 409.
  35. Iorhemen, O.T., Alfa, M.I., Onoja, S.B. (2016). The review of municipal solid waste management in Nigeria: the current trends. Advances in Environmental Research. 5(4): 237 – 249.
  36. Hamza, R.A., Iorhemen, O.T., Tay, J.H. (2016). Anaerobic-aerobic granular system for high-strength wastewater treatment in lagoons. Advances in Environmental Research. 5(3): 169-178.
  37. Iorhemen, O.T., Hamza, R.A., Tay, J.H. (2016). Membrane bioreactor (MBR) technology for wastewater treatment and reclamation: membrane fouling. 6(2): 33.
  38. Hamza, R.A., Iorhemen, O.T., Tay, J.H. (2016). Advances in biological systems for the treatment of high-strength wastewater. Journal of Water Process Engineering. 10: 128-142.
  39. Hamza, R.A., Iorhemen, O.T., Tay, J.H. (2016). Occurrence, impacts and removal of emerging substances of concern from wastewater. Environmental Technology & Innovation. 5: 161-175.
  40. Alfa, I.M., Dahunsi, S.O., Iorhemen, O.T., Okafor, C.C., Ajayi, S.A. (2014). Comparative Evaluation of Biogas Production from Poultry Droppings, Cow Dung and Lemon Grass. Bioresource Technology. 157: 270-277.
  41. Alfa, M.I., Adie, D.B., Iorhemen, O.T., Okafor, C.C., Ajayi, S.A., Dahunsi, S.O., Akali, D.M. (2013). Assessment of Mesophilic Co-digestion of Cow Dung with Lemon Grass for Biogas Production. Nigerian Journal of Technology. 32(3): 478-484.
  42. Akali, D.M., Iorhemen, O.T., Adie, D.B., Okuofu, C.A. (2012). Improvement Design of the Sanitary System at Malali Housing Estate in Kaduna State of Nigeria. Journal of Engineering Research. 17(4): 33-47.