Abstract
Quite some bones of cows and pigs are discharged from home and restaurant industry as food wastes after cooking by boiling. This study conducted adsorption experiment of heavy metals using waste bones as an absorbent for recycling the waste bone and evaluated its feasibility. Sintered cattle bone (SCB) was manufactured in powder form after sintering at 550°C - 600°C and pulverizing, and crystal structure examined by XRD was similar to synthetic hydroxyl apatite. Adsorption equilibrium of single component such as Pb, Cd, and Zn was able to be expressed by isotherm equations of Langmuir, Freundlich, and Sips. Among them, Sips isotherm was accorded best. Also, IAST (ideal adsorbed solution theory) was used to predict multi-component adsorption equilibrium and correlation between those predicted values and empirical values was satisfactory. Adsorption affinity on SCB was in order of Pb, Cd, and Zn and it was corresponded with cases of activated carbon or synthetic hydroxyapatite. Finally, this study confirmed feasibility of SCB as an adsorbent of the heavy metal in real field of wastewater treatment.
Highlights
Studies about estimating performance and designing an adsorption system are divided into mass transfer and selection of adsorption model
The mono-adsorption equilibrium experiment was progressed according to following procedure; the first step was to put a certain amount of the adsorbent (0.1 - 1.0 g) into a 50 ml tube contained 10 - 40 ml of a mixture solution, second step was to put a stopper on top of the tube, step was to leave it in a constant temperature water tank keeping 20 ̊C with mixing for 3 hours, and final step was to analyze residual concentration of filtrate
Those results confirmed that crystal structure and tissues had significant similarity between Sintered cattle bone (SCB) and hydroxyapatite
Summary
Studies about estimating performance and designing an adsorption system are divided into mass transfer and selection of adsorption model. In separation operation by adsorption, a fundamental thing is adsorption equilibrium relationship [1]. The adsorption equilibrium theory underlying analysis of process optimization is still in a slight level, while separation and purification by an adsorption process are continuously developing. Adsorption models are required the theory related to more realistic adsorption phenomena. Most of studies on the adsorption process are considered for an ideal condition or non-ideal adsorption system with the ideal theory. Results indicate that many cases bear no resemblance to reality. It is very difficult to apply directly for analysis of process even though the proper adsorption isotherm is existed in the non-ideal adsorption system
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