Catalytic oxidation with Al–Ce–Fe–PILC as a post-treatment system for coffee wet processing wastewater

Abstract

The effluent from the anaerobic biological treatment of coffee wet processing wastewater (CWPW) contains a non-biodegradable compound that must be treated before it is discharged into a water source. In this paper, the wet hydrogen peroxide catalytic oxidation (WHPCO) process using Al-Ce-Fe-PILC catalysts was researched as a post-treatment system for CWPW and tested in a semi-batch reactor at atmospheric pressure and 25 °C. The Al-Ce-Fe-PILC achieved a high conversion rate of total phenolic compounds (70%) and mineralization to CO(2) (50%) after 5 h reaction time. The chemical oxygen demand (COD) of coffee processing wastewater after wet hydrogen peroxide catalytic oxidation was reduced in 66%. The combination of the two treatment methods, biological (developed by Cenicafé) and catalytic oxidation with Al-Ce-Fe-PILC, achieved a 97% reduction of COD in CWPW. Therefore, the WHPCO using Al-Ce-Fe-PILC catalysts is a viable alternative for the post-treatment of coffee processing wastewater.

Application of Catalytic Wet Peroxide Oxidation for Industrial and Urban Wastewater Treatment: A Review

“…Iron-based catalysts that were supported on pillared clays [65] and alumina [26] were used as catalysts for the post-treatment of wastewater effluents by CWPO. The dose of iron-based supported catalysts varied from 2 to 5 g/L.…”

“…Interestingly, about 50% of the mineralisation (initial COD 551 mg/L) of biologically treated industrial wastewater was achieved after five hours of treatment with the Al-Ce-Fe-PILC catalyst [65]. The efficiency of CWPO with iron-based catalyst in the decomposition of widely used pharmaceuticals from hospital and urban wastewater effluents was recently demonstrated [26].…”

Effects of Cerium, Iron and Copper Incorporation on the Structural Properties and Activities of Ti-Pillared Bentonites

“…In another study by Carriazo et al [37], 90 % phenol conversion and 55 % TOC conversion values after 1 hour of reaction were obtained by using Al-Ce-Fe-pillared clays. Similarly, Sanabria et al [38] achieved 70 % conversion of total phenolic compounds and TOC conversion (50 %) after five hours reaction time using Al-Ce-Fe-pillared clay. It was shown that high phenol and TOC conversion values of iron impregnated Ti-PB in phenol oxidation were obtained when compared with the literature.…”

“…High conversion value to CO 2 gave high TOC conversion value as 60 % for Fe@Ti-PB at given reaction conditions (Table 3, Figure 9). Studies involving pillared clays in phenol oxidation have been reported [10,18,37,38]. Carriazo et al [10] obtained 80 % and 90 % phenol conversions at 180 and 240 minutes respectively by using iron titanium pillared clay.…”

“…The aluminum-copper-iron, zirconium-cerium, manganese-copper on aluminum and ironaluminum containing PILC structures employed in the phenol oxidation exhibited good activity [16][17][18][31][32][33][34][35][36][37][38][39]. A limited number of studies involving titanium pillared structures have been reported in the literature [10,40].…”