Effective removal of chemical oxygen demand from sanitary landfill leachate using raw and chemically treated olive stones

The biosorption capacity of untreated olive stones (OS) and chemically treated (TOS) to remove COD's landfill leachate was investigated in this study. Characterization the both biosorbents performed using XRD, SEM, FTIR 13C NMR techniques. Leachate taken from Hassi Bounif Sanitary Landfill (HBSL) Oran (Western Algeria). So, (HBL) exhibited a basic pH between 7.83 8.2, high COD level varying 5,200 8,000 mg.L-1, low BOD5/COD ratio 0.1 0.16, NH3-N concentrations ranged 2,300 2,800 mg.L-1. Accordingly, can be classified as an intermediate that is likely stabilize. Biosorption studies were carried out batch system effects contact time, media pH, biosorbent mass on removal efficiency explored. Based results obtained at pH=11, times 55 105 min achieved for masses g TOS 0.3 OS, respectively, found optimal operating conditions HBL treatment. Thus, highest efficiencies 79.94 67.04% reached correspondently. pseudo-second order model best fitted our experimental data with regression coefficients (R2 ≥ 0.98). Langmuir isotherm adequately represented process, maximum adsorption 90.91 mg.g-1 31.25 OS T=50°C pH=11. thermodynamic parameters indicated process feasible, spontaneous, endothermic. These findings suggested might employed inexpensive effective stabilized leachate. They also provide baseline information design assistance treatment plant HBSL site, well any sanitary Algeria.