Penentuan Koagulan Untuk Mengolah Air Lindi Bantar Gebang Menggunakan Koagulan Poly Aluminium Chloride, Tawas Dan Polydiallyl Dimethyl Ammonium Chloride

摘要

DETERMINATION OF POLY ALUMINUM CHLORIDE, ALUM AND POLYDIALLYL DIMETHYL AMMONIUM CHLORIDE COAGULANT FOR WATER TREATMENT OF BANTAR GEBANGLEACHATE .The determination of the optimum dosage has been performed on three types of PAC coagulant, alum and POLYDADMAC in leachate water that comes from Waste Water Treatment Plant inlet (IPAS) III Bantar Gebang Bekasi. The aimof research to determine the type of coagulant and pH optimumdose and to treat water leachate and to know the nature or characteristics of the sludge coagulation results. Water Leachet coagulated and flocculated using jartest at pH of 7 at various dose of coagulant. PAC dose varied between 150 mg/L to 1200 mg/L, alum doses between 200 mg/L to 1400 mg/L and POLYDADMAC doses between 25 mg/L to 225 mg/L in order to obtain optimum coagulant dose. Coagulant optimum dose is then used to determine the optimum pH with pH varying ways coagulation at pH 6; 6.5; 7, 7.5 and 8. The parameters measured were COD, TSS, ammonia, nitrate and turbidity as well as the determination of the characteristics of the sludge in the form of value SVI (sludge volume index). Optimum COD removal was obtained at a dose of 800 mg/L for the PAC and 1200 mg/L for Tawas, and 125 mg/L for POLYDADMAC. Provision for ammonia and nitrate from coagulation and flocculation processes proved ineffective, decreased turbidity reached 66.6% - 71.2% and 42.4% TSS - 52%. The allowance for only the TSS and turbidity and did not have much effect on the elimination of ammonia and nitrate. The sludge were produced by coagulation showed that the results of coagulation with PAC, sludge were produced more compact and dense compared with alum and POLYDADMAC. Sludge were produced using coagulant of POLYDADMAC absorb more water than alum and PAC. The length of time required for drying the sludge to reach a stable weight was 12 days at room temperature 26.70 oC - 28.7 oC with humidity of 48-61%.