Enhancing biomass-coated carrier materials in aerobic upflow bioreactor system for polishing palm oil mill effluent / by Liew, Wai Loan, 1986-, author 609903, Mohd. Azraai Kassim, 1958-, supervisor, Khalida Muda, 1969-, supervisor 492994, Loh, Soh Kheang, supervisor 609904, Fakulti Kejuruteraan Awam 8022