1. Nnaji, C.C. and A. Banigo, 2018. Multi-criteria evaluation of sources for self-help domestic water supply. Applied Water Sci., Vol. 8. 10.1007/s13201-018-0657-2.
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2. Nnaji, C.C., P.C. Emenike and I.T. Tenebe, 2017. An optimization approach for assessing the reliability of rainwater harvesting. Water Resour. Manage., 31: 2011-2024.
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3. Nnaji, C.C., G.C. Edeh and J.P. Nnam, 2017. Status of domestic water supply and prospects of rainwater harvesting in Southeastern Nigeria. Int. J. Water (In Press). .
4. Nnaji, C.C., C.C. Mama, D.A. Ezekoye and I. Iwuchukwu, 2017. Coagulation and clarification of wastewater using rices Husk Ash. Desalinat. Water Treat. (In Press). .
5. Nnaji, C.C. and S.C. Emefu, 2017. Effect of particle size on the sorption of lead from water by different species of sawdust: Equilibrium and kinetic study. BioResources, 12: 4123-4145.
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6. Nnaji, C.C., U.H. Amadi and R. Molokwu, 2016. Investigative study of biodeterioration of external sandcrete/concrete walls in Nigeria. Res. J. Environ. Toxicol., 10: 88-99.
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7. Nnaji, C.C., C.N. Mama, C.I. Ekong and C.C. Agu, 2016. A comparative evaluation of the water quality standards of different countries. Asian J. Water Environ. Pollut., 13: 15-28.
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8. Nnaji, C.C., C.J. Ebeagwu and E.I. Ugwu, 2016. Physicochemical conditions for adsorption of lead from water by rice husk ash. BioResources, 12: 799-818.
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9. Nnaji, C.C., B.C. Afangideh and C. Ezeh, 2016. Performance evaluation of clay-sawdust composite filter for point of use water treatment. Niger. J. Technol., 35: 949-956.
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10. Nnaji, C.C., 2016. Material and Energy Recovery Potential of Municipal Solid Waste in Nigeria. In: Dealing with Waste: Resource Recovery and Entrepreneurship in Informal Sector Waste management in African Cities, Adama, O. and C. Nzeadibe (Eds.)., Africa World Press, Trenton.
11. Nnaji, C.C. and S.C. Emefu, 2016. A comparative study of lead adsorption by activated Khaya ivoresnsis and Pycanthus angolensis sawdust. J. Water Sanitation Hyg. Dev., 6: 593-601.
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12. Mgbemene, C.A., C.C. Nnaji and C. Nwozor, 2016. Industrialization and its Backlash: Focus on climate change and its consequences. J. Environ. Sci. Technol., 9: 301-316.
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13. Utsev, J.T., C.C. Nnaji and M.C. Nnennaya, 2015. Effect of flood on water resources in North-Central Nigeria. Asian J. Water Environ. Pollut., 12: 59-71.
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14. Nnaji, C.C., 2015. Status of municipal solid waste generation and disposal in Nigeria. Manage. Environ. Qual. Int. J., 26: 53-71.
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15. Nnaji, C.C., 2015. Effective hydraulic conductivity for a soil of variable pore size with depth. Niger. J. Technol., 34: 636-642.
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16. Ajah, K.C., J. Ademiluyi and C.C. Nnaji, 2015. Spatiality, seasonality and ecological risks of heavy metals in the vicinity of a degenerate municipal central dumpsite in Enugu, Nigeria. J. Environ. Health Sci. Eng., Vol. 13. 10.1186/s40201-015-0168-0.
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17. Afangideh, C.B., C.C. Nnaji, C. Onuora and C. Okafor, 2015. Comparative study of the leachability of heavy metals from sewage sludge, sawdust and organic fraction of municipal solid waste. Br. J. Applied Sci. Technol., Vol. 10. .
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18. Nnaji, C.C., C.N. Mama and O. Ukpabi, 2014. Hierarchical analysis of rainfall variability across Nigeria. Theor. Appl. Climatol., 10.1007/s00704-014-1348-z.
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19. Nnaji, C.C., C. Ekechukwu, F. Onyia and C. Afangideh, 2014. Multicriteria assessment of various onsite wastewater treatment options for Nigeria. J. Environ. Prot., 5: 135-143.
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20. Nnaji, C.C., 2014. A review of the upflow anaerobic sludge blanket reactor. Desalin. Water Treat., 52: 4122-4143.
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21. Nnaji, C.C. and N.C. Mama, 2014. Preliminary assessment of rainwater harvesting potential in Nigeria: Focus on flood mitigation and domestic water supply. Water Resour. Manage., 28: 1907-1920.
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22. Nnaji, C.C. and J.C. Agunwamba, 2014. Quality assessment of water receiving effluents from crude oil flow stations in Niger delta, Nigeria. Water Environ. J., 28: 104-113.
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23. Charles, N.C., 2014. Quantitative and physic-chemical characterization of domestic solid waste in a typical Nigerian municipality. Environ. Conserv. J., 15: 123-133.
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24. Ajon, A.T., J.T. Utsev and C.C. Nnaji, 2014. Physicochemical quality of irrigation water in river Katsina-Ala catchment areas of northern Nigeria. Current World Environ., 9: 301-311.
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25. Nnaji, C.C., C.N. Mama, A. Ekwueme and T. Utsev, 2013. Feasibility of a filtration-adsorption grey water treatment system for developing countries. Hydrol. Current Res., .
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26. Nnaji, C.C., C. Eluwa and C. Nwoji, 2013. Dynamics of domestic water supply and consumption in a semi-urban Nigerian city. Habitat Int., 40: 127-135.
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27. Nnaji, C.C., A. Ifeyinwa and I. Ifeoma, 2013. The ineffectiveness of manual treatment of swimming pools. J. Appl. Sci. Environ. Manage., 15: 517-522.
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28. Nnaji, C.C. and J.C. Agunwamba, 2013. The environmental impact of crude oil formation water: A multivariate approach. J. Water Chem. Technol., 35: 222-232.
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29. Nnaji, C.C., 2012. Comparative Study of Fourteen Surface Water Bodies Impacted by Anthropogenic Activities. In: Five Decades of Oil Production in Nigeria: Impact on the Niger Delta. Akpotor, A.S., C.O. Orubu, S.H. Egboh, B.S. Olabaniyi, A.I. Ohwona and R.O. Olomo (Ed.). Centre for Environmental and Niger Delta Studies, Ibadan, Nigeria., pp: 373-389.
30. Nnaji, C.C. and J.C. Agunwamba, 2012. Mass balance model for sludge accumulation in septic tanks. Int. J. Current Res., 4: 130-134.
31. Nnaji, C.C. and J.C. Agunwamba, 2012. Detention time as a critical parameter in septic tank design. Asian J. Water Environ. Pollut., 9: 31-38.
32. Nnaji, C.C. and J.C. Agunwamba, 2012. A rational approach to septic tank design. Niger. J. Technol., 31: 68-78.
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33. Nnaji, C.C., 2011. Time series analysis of monthly rainfall in Nigeria with emphasis on self-organized criticality. J. Sci. Technol., 31: 139-151.
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34. Nnaji, C.C. and J.T. Utsev, 2011. Climate change and waste management: A balanced assessment. J. Sustainable Dev. Afr., 13: 17-34.
35. Afangideh, C.B., J.O. Ademiluyi, C.C. Nnaji and M. Eng, 2011. LMT sludge filtration equation using dimensional analysis. Pac. J. Sci. Technol., 12: 512-519.
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36. Nnaji, C.C., 2010. Prediction of rainfall magnitudes and variations in Nigeria. Niger. J. Technol., 29: 46-53.
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37. Nnaji, C.C. and P. Ozougwu, 2010. Comparative analysis of the biodegradability of sewage, abattoir wastewater and cassava wastewater. Technosci. Rev., 1: 3-9.
38. Nnaji, C.C., 2009. Rational basis for determining the desludging interval of septic tanks. J. Agric. Eng. Technol., 17: 94-100.
39. Agunwamba, J.C., C.C. Nnaji and E.C.B. Igwenagu, 2009. Prediction of soil erosion using a modified WEPP model. J. Eng. Ind. Design, 1: 24-34.
40. Agunwamba, J.C. and C.C. Nnaji, 2009. The effects of off take angle on the velocity distribution and rate of siltation of canals. Niger. J. Technol., 28: 13-22.
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41. Agunwamba, J.C. and C.C. Nnaji, 2008. The oil adsorption characteristics of sphanum peat moss (moss sp). Int. J. Pure Appl. Sci., 1: 111-116.