OPTIMIZATION OF THE COAGULATION FLOCCULATION PROCESS OF BENOWO LANDFILL USING POLY ALUMINUM CHLORIDE AND CHITOSANIpung Fitri Purwanti, Harmin Sulistyaning Titah, Bieby Voijant Tangahu, Sarwoko Mangkoedihardjo, Mahdiyah Anes, Rizki Mona Syawlia and Hassimi Abu Hassan
The content of organic material which is not easily degraded in Benowo landfill leachate is quite high and it makes microorganisms difficult to degrade waste. One of the methods that can be used to reduce organic load is by optimizing the processing of coagulation flocculation using PAC coagulant and chitosan flocculant. This study aims to reduce the concentration of COD (Chemical Oxygen Demand), TSS (Total Suspended Solid) and turbidity in the leachate. The variations that used in this study are the concentration of PAC (Poly Aluminum Chloride) coagulant and concentration of chitosan flocculant. The advantages of using coagulation flocculation is to reduce the organic load of leachate as well as removing suspended solids to make further processing is easier. The coagulation process operate on 260 rpm for 1 minute and 50 rpm for 20 minutes using PAC and chitosan because coagulants and flocculants are faster in floc formation and can reduce organic particles in leachate. The results showed the highest efficiency of COD, TSS and turbidity at dose of PAC coagulant 2400 mg / L with 350 mg / L chitosan flocculants are 71%, 45%, and 94%.