Polysulfone (PS)  ultrafiltration (UF)-membrane with Molecular Weight Cut Off (MWCO) 100kD was examined with the aim of improving the sugarcane juice clarity while a modified bentonite (organo-bentonite) by benzalkonium chloride (BAC) was used as adsorbent for reducing colour and turbidity instead of sulphitation process. Factors influencing the adsorption capacity of organo-bentonite, such as BAC concentration, adsorbent dosage, pH, contact time and temperature beside factors that influence the ultra-filtration process like transmembrane pressure and temperature were systematically investigated and discussed. The results of analysis indicated that the adsorption capacity of organo-bentonite increases with increasing BAC concentration, adsorbent dosage, temperature and with decreasing pH while membrane flux increases with increasing transmembrane pressure and temperature. The optimum conditions were adjusted at a constant reaction time (10 min), temperature 75 °C, pH 5.0, BAC concentration of amount equal to100% of cation exchange capacity (CEC) of bentonite and organo-bentonite dose (0.6 g/L) which were determined on minimization of colour, turbidity, ash content and invert sugar and maximization of  purity. At this optimum point: colour, turbidity, ash%, reducing sugars%sugar and purity were found to be 7635 IU₄₂₀, 3.0 NTU, 0.474%, 4.8% and 85%, respectively. Also the clarified juice quality obtained by the treatment was improved greatly when compared with conventional limed–sulphated  juice as the colour and turbidity in the clarified juice were removed by the rate of 32% and 94%, respectively.