Reducing Environment Pollution by Reusing of Alum Sludge Waste in Stone Mastic Asphalt Mixtures
Globally, a huge quantity of alum sludge waste is produced as a by-product material from drinking water treatment plants that utilize aluminum salts as an essential coagulate and is the most generally produced water treatment remaining sludge around the world, which causes a serious environmental problem. Direct discarding of this substance has ecological effects. Hence, it is important to reuse this alum sludge waste material in such a manner to diminish its detrimental impacts on the environment. This research investigates the possibility of reusing alum sludge waste as a partial replacement of cement filler in stone mastic asphalt (SMA) paving mixtures. For this investigation, the alum sludge was used as a filler material in SMA mixtures in two modes; dried alum sludge at 110°C and burned alum sludge at 700°C. Different percentages of alum sludge were used as a replacement by the total weight of mineral filler at 0, 20, 40, 60, 80, and 100%. The results showed that using alum sludge as a substitution of filler in SMA mixtures reduces the performance of the mixtures in terms of Marshall properties and tensile strength for both dried and burned alum sludge compared with a standard mix. However, the performance of the mixtures containing burned alum sludge gave a better performance than the mixtures containing dried alum sludge.
Ahmad, T., Ahmad, K. and Alam, M., 2016. Sustainable management of water treatment sludge through 3 ‘R’ concept. Journal of Cleaner Production, 124, pp.1-13.
American Association of State Highway and Transportation Officials (AASHTO), 2009. Standard Specification for Stone Matrix Asphalt (SMA), No. M325-08, American Association of State Highway and Transportation Officials, Washington, DC. American Association of State Highway and Transportation Officials, 2021.
Standard Method of Test for Resistance of Compacted Asphalt Mixtures to Moisture-Induced Damage, American Association of State Highway and Transportation Officials, No. 283, Washington, DC. ASTM D4867-04. Standard Practice for Effect of Moistureon Asphalt Concrete Paving Mixtures.
ASTM D6926-10. Standard Practice for Preparation of Bituminous Specimens Using Marshall Apparatus.
ASTM D6927-15. Standard Test Method for Marshall Stability and Flow of Asphalt Mixtures.
ASTM D6931-12. Standard Test Method for Indirect Tensile (IDT) Strength of Bituminous Mixtures.
Department of Environment, 2005. Guidelines for the Application of Special Management of Scheduled Waste. Environmental Quality Act (Scheduled Waste) Regulation, Department of Environment, Ministry of Natural Resources and Environment, Malaysia.
Gebbie, P., 2001. Using Polyaluminium Coagulants in Water Treatment. In: 64th Annual Water Industry Engineers and Operators’ Conference All Seasons International Hotel, Bendigo, 5 and 6 September, 2001.
Ghazawi, Z., Khedaywi, T. and Gouneem, A., 2015. Pollution Reduction and Reuse of Sludge Waste in Asphalt Paving Mixtures. In: Proceedings of the 4th International Conference on Energy Systems, Environment, Entrepreneurship and Innovation (ICESEEI’ 15) Dubai, United Arab Emirates February 22-24, pp.395-400.
Keeley, J., Jarvis, P. and Judd, S.J., 2014. Coagulant recovery from water treatment residuals: A review of applicable technologies. Critical Reviews in Environmental Science and Technology, 44(24), pp.12-25.
Khalid, M.B., Faris, G.F. and Isam, M.A., 2014. Reuse of alum sludge in construction materials and concrete works: a general overview. Infrastructure University Kuala Lumpur Research Journal, 2(1), pp.20-30.
Mahmood, O.T. and Ahmed, S.A., 2020. Influence of natural fibers on the performance of hot mix asphalt for the wearing course of pavement. ARO The Scientific Journal of Koya University, 8(2), p.10710.
Sahar A.A., Hayder A.O., Tameem M.H. and Kareem, H., 2019. Influence of Using Alum Sludge as an Aggregate on Hot Mix Asphalt. In: International Conference on Civil and Environmental Engineering Technologies. IOP Conference Series Materials Science and Engineering, Vol. 584.
Turner, T., Wheeler, R., Stone, A. and Oliver, I., 2019. Potential alternative reuse pathways for water treatment residuals: Remaining barriers and questions a review. Water Air Soil Pollution, 230, p.227.
Xu, D., Lee, L.Y., Lim, F.Y., Lyu, Z., Zhu, H., Ong, S.L. and Hu, J., 2020. Water treatment residual: A critical review of its applications on pollutant removal from storm water runoff and future perspectives. The Journal of Environmental Management, 259, p.109649.
Yang, Y., Tomlinson, D., Kennedy, S. and Zhao, Y.Q., 2006a. Dewatered alum sludge: A potential adsorbent for phosphorus removal. Water Science and Technology, 54(5), pp.207-213.
Zhao, Y.Q., Liu, R.B., Awe, O.W., Yang, Y. and Shen, C., 2018. Acceptability of land application of alum-based water treatment residuals an explicit and comprehensive review. The Chemical Engineering Journal, 353, pp.717-726.
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