Adsorption and recovery of aroma compounds from wastewater of clove oil distillation using coffee husk biosorbent

Abstract

Coffee husk was used as potential biosorbent in order to adsorb volatile compounds from wastewater of clove oil distillation and the oil was recovered from the wastewater. Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used for the characterization of coffee husk. Coffee husk was carbonized and activated using hydrochloric acid. Identification of functional group by infrared spectrum on coffee husk showed the dominant peaks at 3327 cm −1 (O−H) and 1608 cm −1 (C− −C, C− −O). The activated carbonized coffee husk showed the OH-peaks weakly in the spectrum. SEM surface analysis showed an uneven surface on the coffee husk. The optimum adsorption of clove oil was determined by chemical oxygen demand (COD). Optimization of coffee husk adsorbent was obtained by waste volume of 10 ml, the weight of 1.5 g and contact time of 120 min. The adsorption efficiency of the organic compound from wastewater was 37.96%. Eugenol and eugenol acetate recovery of coffee husk adsorption were 79.44% and 54.05%, respectively. The recovery of clove oil in wastewater distillation was 0.31%.

Evaluation of Activated Carbon Electrodes as Anodes in a Microbial Fuel Cell Using Shewanella Putrefaciens

“…The morphology of activated carbon from coffee cisco with H3PO4 (Q) is observed in Figure 2a. The structure of sample Q is composed by "flakes" or dishes that form cavities and wide macropores, similar to the materials prepared by Maimulyanti et al [19]. Its porous structure is made up of homogeneous pores (figure inserted in Figure 2) compared to the coffee husk activated with NaOH/CO2 by Ahmad et al [18].…”