1. Hadiyanto, H., Christwardana, M. and Soetrisnanto, D., “Phytoremediations of palm oil mill effluent (POME) by using aquatic plants and microalge for biomass production”, International Journal of Engineering - Transaction C: Aspects, Vol. 27, No. 12, (2014), 1809–1814. 2. Yeoh, G., “A technical and economic analysis of heat and power generation from biomethanation of palm oil mill effluent”, International Energy Journal, Vol. 6, No. 1, (2004), 63–79. 3. Bukhari, N. A., Ngatiman, M., Soh, K. L. and Choo, Y. M., “Characteristics of palm oil mill effluent (POME) in an anaerobic biogas digester”, Asian Joournal of Microbiology, Biotechnology & Environmental Sciences, Vol. 16, No. 1, (2014), 225–231. 4. Zhang, Y., Yan, L., Qiao, X., Chi, L., Niu, X., Mei, Z. and Zhang, Z., “Integration of biological method and membrane technology in treating palm oil mill effluent”, Journal of Environmental Sciences, Vol. 20, No. 5, (2008), 558–564. 5. Ahmad, A. L., Sumathi, S. and Hameed, B. H., “Coagulation of residue oil and suspended solid in palm oil mill effluent by chitosan, alum and PAC”, Chemical Engineering Journal, Vol. 118, No. 1–2, (2006), 99–105. 6. Ebrahimi, A., Asadi, M. and Najafpour, G. D., “Dairy wastewater treatment using three-stage rotating biological contactor (NRBC)”, International Journal of Engineering - Transaction B: Application, Vol. 22, No. 2, (2009), 107-114. 7. Wu, Y.T, Mohammad, A. W., Jahim, J. M. and Anuar, N., “A holistic approach to managing palm oil mill effluent (POME): biotechnological advances in the sustainable reuse of POME”, Biotechnology Advance, Vol. 27, No. 1, (2009), 40–52. 8. Chin, M. J., Poh, P. E., Tey, B. T., Chan, E. S. and Chin, K. L., “Biogas from palm oil mill effluent (POME): opportunities and challenges from Malaysia’s perspective”, Renewable and Sustainable Energy Reviews, Vol. 26, (2013), 717–726. 9. King, L. S. and Yu, L. C., “A retrofitted palm oil mill effluent treatment system for tapping biogas”, European International Journal of Science and Technology, Vol. 2, (2013), 106–114. 10. Iritani, E., Katagiri, N. and Kanetake, S., “Determination of cake filtration characteristics of dilute suspension of bentonite from various filtration tests”, Separation and Purification Technology, Vol. 92, (2012), 143–151. 11. Mahdi, F. M. and Holdich, R. G., “Chemical engineering research and design laboratory cake filtration testing using constant rate”, Chemical Engineering Research and Design, Vol. 91, No. 6, (2012), 1145–1154. 12. Tien, C. and Bai, R., “An assessment of the conventional cake filtration theory”, Chemical Engineering Science, Vol. 58, No. 7, (2003), 1323–1336. 13. Du, L., Chen, X., Li, W. and Zhu, Q., “A study on enhancement of filtration process with filter aids diatomaceous earth and wood pulp cellulose”, Chinese Journal of Chemical Engineering, Vol. 19, No. 5, (2011), 792–798. 14. Chen, W., “Optimization of sludge dewatering through pretreatment, equipment selection, and testing”, Drying Technology, Vol. 31, No. 2, (2013), 193–201. 15. Wu, C., Li, Z., Su, X., Jia, Y. and Lu, X., “Novel ultrafiltration membrane fouling control method with in-situ filter aid of perlite particles”, Desalination and Water Treatment, Vol. 57, No. 12, (2016), 5365–5375. 16. Maxim, L. D., Niebo, R. and McConnell, E. E., “Perlite toxicology and epidemiology – a review”, Inhalation Toxicology, Vol. 26, No. 5, (2014), 259–270. 17. Petrović, D. V., Mitrović, Č. B., Trišovic, N. R. and Golubović, Z. Z., “On the particles size distributions of diatomaceous earth and perlite granulations” Journal of Mechanical Engineering, Vol. 57, No. 11, (2011), 843–850. 18. Braun, F., Hildebrand, N., Wilkinson, S., Back, W., Krottenthaler, M. and Becker, T., “Large-scale study on beer filtration with combined filter aid additions to cellulose fibres”, Journal of the Institute of Brewing, Vol. 117, No. 3, (2011), 314–328. 19. Ediz, N., Bentli, I. and Tatar, I., “Improvement in filtration characteristics of diatomite by calcination”, International Journal of Mineral Processing, Vol. 94, No. 3–4, (2010), 129–134. 20. Kinnarinen, T., Tuunila, R., Huhtanen, M., Häkkinen, A., Kejik, P. and Sverak, T., “Wet grinding of CaCO3 with a stirred media mill: Influence of obtained particle size distributions on pressure filtration properties”, Powder Technology, Vol. 273, (2015), 54–61, 21. Zinatizadeh, A. A. L., Mohamed, A. R ., Mashitah, M. D., Abdullah, A. Z. and Najafpour, G., “Pretreated palm oil mill effluent (POME) digestion in an up-flow anaerobic sludge fixed film bioreactor: a comparative study”, International Journal of Engineering - Transaction B: Application, Vol. 19, No. 1, (2006), 1-9. 22. Chang, S. Y., Toledo, R. T., Science, F., Lillard, H. S. and Russell, R. B., “Clarification and decontamination of poultry chiller water for recycling”, Poultry Science, Vol. 68, (1987), 1100–1108. 23. Wakeman, R., “The influence of particle properties on filtration”, Separation and Purification Technology, Vol. 58, (2007), 234–241.