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Application of Ion Exchange Process for Landfill Leachate Treatment

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Application of Ion Exchange Process for Landfill Leachate Treatment APPLICATION OF ION EXCHANGE PROCESS FOR LANDFILL LEACHATE TREATMENT Mohammed Jaber Bashir PhD candidates University Science Malaysia (USM) Email: [email protected] Abstract This study examined the capability of ion exchange process for removing color, COD, and NH3- N from stabilized landfill leachate samples which were collected from Pulau Burung semi- aerobic landfill site in Penang, Malaysia between February and September This stabilized leachate contains high concentration of color, COD and NH3-N which need to be treated to meet the environmental regulations. Therefore tow available commercial resin INDION 225 Na cationic exchanger in H+ form and INDION FFIP MB anionic exchanger in Cl- from were used as in this study. The results indicated better removal of color, COD and NH3-N by applying cationic resin followed by anionic resin 97, 88 and 94, percent of color, COD and NH3-N were removed from initial concentration of 5250, 2430 and 1870, mg/L, respectively. Keywords: cationic exchanger, anion exchanger, commercial resin. INTRODUCTION: BACKGROUND: Landfill leachate is a complicated wastewater that contains high concentration of COD or BOD, ammonia, suspended solids, heavy metals and inorganic salts etc [1]. Several treatment processes have been applied to treat leachate such as; Biological treatment, Coagulation and flocculation, Activated carbon adsorption, Air stripping, Electrochemical oxidation, advanced oxidation processes, Chemical precipitation, ion exchange…etc [2]. The highest amount of commercial ion exchange materials used in domestic water-treatment technologies [3]. Whereas the applications of ion exchange techniques are not usual for the treatment of landfill leachate. MATERIALS AND METHODS: Commercially available two exchanger resins were used in this study INDION 225 Na - as cationic exchanger and INDION FFIP MB - as anionic exchanger.The initial concentration of color, pH, chemical oxygen demand (COD) and NH3-N were measured before each experiment run. The samples were analyzed and the characteristics of the samples presented in Table 2. The batch experiments were carried out through shaking of 100ml leachate sample in 250 ml size volumetric flask by using an orbital shaker. The experimental conditions were the contact time, dosage and shaking speed at 20 min, 30cm3 and 150rpm respectively for cationic exchanger, while the conditions for anionic exchanger were 90 min, 30cm3 and 150 rpm respectively. Five stages were used to treat leachate as explained in figures 1. Table 1: Characteristics of stabilized landfill leachate from PBLS Parameters Units Values COD mg/L 2060-2700 NH3-N mg/L 1700-2050 Color Pt-Co 4800 - 5700 pH --- 8.67 – 9.17 RESULTS AND DISCUSSION: by applying cationic followed by anionic resin achieved 97, 88 and 94 percent of color, COD and NH3-N removal respectively from initial concentration of 5250, 2430 and 1870 mg/L as presented in figure 1. Therefore, the experimental procedure indicated a good removal performance were resulted when applied resin treatment in series. 100 90 80 70 60 50 40 Removal(%) 30 20 10 0 COD NH3-N Color pH Parameters 1 2 3 4 5 Figure 1: The affectivity of applying anionic, cationic resin or both on COD, Color and NH3-N removal. Leachate treated by using: 1Cationic resin in Na+ form, 2Cationic resin in H+ form, 3Anionic resin in Cl- form, 4Anionic resin in Cl- form followed by cationic resin in H+ form, 5Ctionic resin in H+ form followed anionic resin in Cl- form. REFERENCES [1] Tatsi A.A., Zouboulis A.I., Matis K.A. and Samaras P., 2003- Coagulation-flocculation pretreatment of sanitary landfill leachates, Chemosphere, Vol. 53, P: 737-744. [2] Kurniawan T.A., Lo W.H and Chan G.Y.S., 2006- Physico-chemical treatments for removal of recalcitrant contaminants from landfill leachate, Hazard. Mater, Vol. 129, p: 80–100. [3] Zagorodni A. A., 2006- Ion Exchange Materials: properties and applications, Elsevier publisher, online Book, P: 2. .
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