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SELECTING OF AN EFFECTIVE ADSORBENT FOR TREATING PHOSPHATE CONTAMINATION | ||
| Journal of Engineering and Sustainable Development | ||
| Article 1, Volume 20, Issue 5, 2016, Pages 136-155 | ||
| Authors | ||
| Ahmed Hassoon Ali; Younis Swadi Tlaiaa; Lahieb Faisal M. Ali; Ali Qasim Rdhaiwi | ||
| Abstract | ||
| : Experimental researches on adsorptive capacity of: Granular Activated Carbon GAC, Phosphate Rock PR, Saw Dust SD and Rice Husk RH for phosphate removal from simulated wastewater were conducted. Results showed that removal efficiency of four adsorbents were in the consequence as: RR (82.6%) ˃ SD (43.72%) ˃ GAC (41.28%) ˃ RH (34.4%). To understand the action of phosphate uptake, factors influencing the adsorption process using best adsorbent (PR) including pH, mixing speed, contact time, weight of the adsorbent, initial phosphate concentration and temperature were investigated. It was found that the equilibrium data fitted very well to the Langmuir model with high determination coefficient (R2). The maximum uptake capacity (qmax) was 24.716 mg/g. Adsorption data were modeled using the pseudo-first, pseudo-second-order, Intraparticle diffusion and Elovich models. It was found that, the pseudo- second-order kinetic equation could best describe the adsorption kinetics. Thermodynamic parameters showed that the adsorption of investigated phosphate onto PR was exothermic, spontaneous in nature and the process is physiosorption. It was found that sodium hydroxide (0.1 M NaOH) was efficient desorbent solution in recovery of phosphate pollutant among different desorbents: HCl, H2SO4, NaOH, Na2CO3, EDTA and deionized distilled water (DDW) from PR. The breakthrough curves for the adsorption column test was obtained in a continuous adsorption fixed-bed experiment, The measured breakthrough times for RH, GAC, SD and PR were found to be 10, 30, 40 and 60 min, respectively. | ||
| Keywords | ||
| adsorption; Phosphate; GAC | ||
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