New hybrid process combining adsorption on sawdust and electroxidation using a BDD anode for the treatment of dilute wastewater

Abstract

A new hybrid process that integrates adsorption on sawdust and electrochemical oxidation on a boron doped diamond anode was investigated for the treatment of dilute solutions containing phenol. In such combined process the pollutant is adsorbed until saturation and electrochemical oxidation has been used for both the regeneration of adsorbant and the pollutant removal. Phenol is used as model of pollutant and the efficiency of the regeneration of loaded sawdust has been compared with that of activated carbon (AC), a widely used adsorbent due to its high adsorption capacity which results from its high porosity. The study highlights the effect of electrolysis in the increase of the phenol desorption during the treatment of adsorbents. The regeneration efficiency of AC after 1 cycle of adsorption and regeneration is only 59% due to the electropolymerisation of the strongly adsorbed phenol. By contrast, the electrochemical regeneration of sawdust led to increase the adsorption capacity multiple adsorption and electrochemical regeneration cycles led to an enhancement of adsorption capacity of the sawdust with a complete removal of phenol and the possible reuse of the electrolysis solution.

Degradation of diclofenac aqueous solutions in a 3D electrolytic reactor using carbon-based materials as pseudo third electrodes in fluidized bed, anodic and cathodic configurations

“…9). It can be seen from Table 4 that the surface areas for the fresh materials (862 m 2 g − 1 for GAC and 25.3 m 2 g − 1 for GEG) are within the expected ranges for typical commercial GACs and GEGs of 800-1100 and 30-40 m 2 g − 1 , respectively [39,50,63,75]. After the electro-oxidation process, a decrease in surface area of up to 50% for the GAC and 85% for the GEG was observed.…”

“…This is lower than the value obtained for the GAC but it is not unexpected because of GEG's (SIGRATHERM® GFG 1200) lower surface area (25.3 m 2 g − 1 ) and more limited access of DCF to the lamellar space in the GEG sample. This result indicates that DCF adsorption is likely limited to the external surface of the GEG, on which HO • and other oxidizing agents in solution contact readily the adsorbed pollutant and thus facilitate DCF degradation process in the electrolytic cell [50].…”

Removing Pollutants from Sewage Waters with Ground Apricot Kernel Shell Material

“…Of special interest are wood biomass components, such leaves [ 1 , 2 , 3 ], conifers’ needles [ 4 , 5 , 6 ] and cones [ 7 , 8 , 9 ] and fruit peels [ 10 , 11 , 12 ]; and wood processing waste, such as sawdust [ 13 , 14 , 15 ], fruit kernels left after fruit processing [ 16 , 17 , 18 ] and nut shells [ 19 , 20 , 21 ], which are generated annually in large quantities, are cheap and have a renewable raw-material base.…”

Evaluation of electrolytic reactor configuration for the regeneration of granular activated carbon saturated with methylene blue

“…In this context, the main goal of the present study was to evaluate the effects of the current density, initial pH and operation time on the performance of the ER of GAC saturated with methylene blue (MB). MB was used as a model substance for the purpose of comparison with the electrochemical degradation results of previous studies [28][29][30][31][32][33], in fluidized bed and packed bed configurations, using BDD electrodes.…”