Evaluation of Adsorption Capacity of Chitosan-Citral Schiff Base for Wastewater Pre-Treatment in Dairy Industries

Desislava K. Tsaneva1*, Milena I. Nikolova2, Tsvetko V. Prokopov2, Albena S. Stoyanova3, Panteley P. Denev1
1 - University of Food Technologies, Department of Organic and Inorganic Chemistry, 26 Maritsa blvd. 4002 Plovdiv, BULGARIA
2 - University of Food Technologies, Department of Engineering Ecology, 26 Maritsa blvd. 4002 Plovdiv, BULGARIA
3 - University of Food Technologies, Department of Tobacco, Sugar, Vegetable and Essential Oils, Perfumery and Cosmetics, 26 Maritsa blvd. 4002 Plovdiv, BULGARIA
* Corresponding author: desi_gb12@mail.bg
Abstract. In this study, we aimed to evaluate the adsorption capacity of the Schiff base chitosan-citral for its application in dairy wastewater pre-treatment. Chemical oxygen demand (COD) reduction was the factor used to evaluate the adsorption efficiency. The maximum COD percentage reduction of 35.3% was obtained at 40.0 °C, pH 9.0, adsorbent dose 15 g L-1, contact time 180 min and agitation speed 100 rpm. It was found that the Langmuir isotherm fitted well the equilibrium data of COD uptake (R2 = 0.968), whereas the kinetic data were best fitted by the pseudo-second order model (R2=0.999). Enhancement of the adsorption efficiency up to 29.8% in dependence of the initial COD concentration of the dairy wastewater was observed by adsorption with the Schiff base chitosan-citral adsorbent compared to the non-modified chitosan at the same experimental conditions. The results indicated that the Schiff base chitosan-citral can be used for dairy wastewater physicochemical pretreatment by adsorption, which might be applied before the biological unit in the wastewater treatment plant to reduce the load.
Key words: Chitosan-citral, Schiff base, adsorption, wastewater, COD removal efficiency.

Ecologia Balkanica, 2017, vol. 9, Issue 1, pp. 91-102
Article № eb.17106 [Full text - PDF]pdf

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