Murat SOLAK, Nazlı BALDAN PAKDİL, Mehmet KILIÇ, Mehmet KOBYA

Elektrokoagülasyon Prosesi ile Patates Cipsi üretim atıksularından fosfor giderimi: Elektrot Materyali karşılaştırması

Removal of Phosphorus from Potato Chips Processing Wastewater by Electrocoagulation Process: Comparison of Electrode Material

In this study, removal of phosphorus from potato chips processing wastewater by electrocoagulation (EC)process was investigated by using Al and Fe electrodes. Operating parameters affecting phosphorusremoval efficiency such as pH, current density and electrolysis time were optimized. In the EC modelreactor in which either Al or Fe electrodes were used, the optimum hydraulic retention time was found tobe 40 and 60 min, respectively, while the final pH was found to be 7.85 and 8.15, respectively, and thecurrent density was found to be 65 A/m2 for both electrode types. In case of using Al and Fe electrodesunder these experimental conditions, the initial total phosphorus concentration of 54.4 mg/L decreased to10.4 and 5.0 mg/L, respectively, and the initial orthophosphate concentration of 45.3 mg/L decreased to5.9 and 2.9 mg/L, respectively. Considering the final pH value, it can be pointed out that the resultanteffluent can be discharged without any pH adjustment.Considering the costs for electrodes, energy and chemical agents, operating costs for the continuous-flowEC model reactor were found out to be $1.14 and 0.76 per cubic meter wastewater for Al and Feelectrodes, respectively. It was determined that Fe electrodes are more effective than Al electrodes for theremoval of phosphates from potato chips processing wastewaters, and that the operating costs are lowerwhen Fe electrodes are used. It has been determined that the orthophosphate and total phosphorusremoval by the EC process is suitable with the second order reaction kinetics.

Keywords:

aluminum electrode, iron electrode electrocoagulation, phosphorus removal, operating cost, potatoes chips processing wastewater,

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