Naeem, M.H., Khan, N.A., Syed, N.U.H., saira bano and muddasar habib 2023. An alternate acid cleaning process for the regeneration of waste engine oil and a proposed procedure for the disposal of produced sludge. Journal of the Pakistan Institute of Chemical Engineers. 51, 1 (Aug. 2023). DOI:https://doi.org/10.54693/piche.05116.