Utilization of Water Treatment Plant Waste Sludge in a Cementitious Matrix

IJEP 42(13): 1624-1631 : Vol. 42 Issue. 13 (Conference 2022)

Piyush Tripathi*, Priyaranjan Pal and D. Basu

Motilal Nehru National Institute of Technology, Allahabad, Department of Civil Engineering, Prayagraj – 211 004, Uttar Pradesh, India


Traditional treatment techniques in raw water treatment plants produce massive quantities of sludge globally. Due to the chemical makeup of sludge, stringent environmental regulations are necessary to avoid the adverse environmental effects connected with the disposal of such a massive waste stream. In the cementitious matrix, it has been proposed to use post-coagulation-flocculation sludge created artificially. In the present study, sludge was utilized as a partial replacement for cement in the mortar mixture in order to lower the amount of natural contents. The addition of sludge altered the mortar’s composition and performance. This study aims to determine the optimal replacement percentage of sludge with cementitious material based on the compressive strength of mortar cubes. In general, compressive strength declines as sludge concentration increases. The maximum compressive strength was achieved at 10% sludge replacement. The experimental results revealed that the mortar containing 10% water treatment sludge (WTS) is suitable for building and construction since its strength varies with replacement levels.


Water treatment sludge, Mechanical property, XRD, SEM, Waste recycling


  1. Ahmad, T., K. Ahmad and M. Alam. 2017. Sludge quantification at water treatment plant and its management scenario. Env. Monit. Assess., 189(9): 453. DOI: 10.1007/s10661-017-6166-1.
  2. CPCB. 2008. Status of water treatment plants in India. Central Pollution Control Board, New Delhi.
  3. Ahmad, T., K. Ahmad and M. Alam. 2016. Characterization of water treatment plant’s sludge and its safe disposal options. Procedia Env. Sci., 35: 950-955. DOI: 10.1016/j.proenv.2016.07.088.
  4. Abdo, S.M., et al. 2020. Cationic starch and polyaluminum chloride as coagulants for river Nile water treatment. Groundwater Sustain. Devlop., 10:100331. DOI: 10.1016/j.gsd.2020.100331.
  5. Johnson, K.M., et al. 2017. Storage, clarification and chemical treatment (chapter 8). In Twort’s water supply (7th edn). pp 323-366.
  6. Ahmad, T., K. Ahmad and M. Alam. 2018. Characterization and constructive utilization of sludge produced in clari-flocculation unit of water treatment plant. Mater. Res. Express.5:035511. DOI: 10.1088/2053-1591/aab23a.
  7. Ahmad, T., K. Ahmad and M. Alam. 2016. Sustainable management of water treatment sludge through 3’R’ concept. J. Clean. Prod., 124:1-13. DOI: 10.1016/j.jclepro.2016.02.073.
  8. Wang, B.M.C., et al. 1992. Engineering behavior of water treatment sludge. J. Env. Eng., 118: 848-864.
  9. IS 2720. 1973. Methods of test for soils (2nd revision). Bureau of Indian Standards, New Delhi.
  10. Tantawy, M.A. 2015. Characterization and pozzolanic properties of calcined alum sludge. Mater. Res. Bull., 61:415-421. DOI: 10.1016/j.materres bull.2014.10.042.
  11. Zhang, H.Z. 2011. Cement (chapter 4). In Building materials in civil engineering. Woodhead Publishing Limited and Science Press. pp 46–80.
  12. Suksiripattanapong, C., et al. 2015. Compressive strength development in flyash geopolymer masonry units manufactured from water treatment sludge. Constr. Build. Mater., 82:20-30. DOI: 10. 1016/j.conbuildmat.2015.02.040.
  13. IS 8112. 1989. Ordinary Portland cement, 43 grade- Specification (2nd revision). Bureau of Indian Standards, New Delhi.
  14. Basu, D., P. Pal and A. Prakash. 2022. Utilization of waste sludge in cementitious matrix: A feasibility study. Mater. Today Proc.,65:1375-1381.
  15. Waijarean, N., S. Asavapisit, and K. Sombatsom-pop. 2014. Strength and microstructure of water treatment residue-based geopolymers containing heavy metals. Constr. Build. Mater., 50:486-491. DOI: 10.1016/j.conbuildmat.2013.08.047.
  16. IS 2250. 1981. Code of practice for preparation and use of masonry mortars. Bureau of Indian Standards, New Delhi.
  17. Lin, K.L. and C.Y. Lin. 2005. Hydration characteristics of waste sludge ash utilized as raw cement material. Cement Concrete Res., 35(10):1999-2007. DOI: 10.1016/j.cemconres.2005.06.008.