Ozonation of return activated sludge for disintegration and solubilisation with synthesized titanium oxide as catalystS.F.Z. Mohd Sarif, S.S. Alias, F. Muhammad Ridwan, K.S. Ku Salim, C.Z.A. Abidin and U.F. Md. AliE3S Web Conf., 34 (2018) 02009DOI: https://doi.org/10.1051/e3sconf/20183402009