Abstract-In this study, removal of chemical oxygen demand (COD) and total phenols (TP) from pistachio processing industry wastewater was investigated using electrocoagulation method. COD and TP removal efficiencies were compared considering wastewater initial pH by using stainless steel cathodes and aluminum anodes. To determine the effect of initial pH on removal efficiency, 4, 5.2 (original wastewater pH), 6 and 7 pH were investigated. Results showed that optimum values of operating variables wastewater initial pH was 5.2 for COD removal efficiency and 7 for TF removal efficiency. Removal of COD of pH 5.2 up has increased. Removal of COD began to decrease at higher pH values than the original pH value. TF removal efficiency increased with increasing pH. The pH values at the obtained the highest energy consumption value was the original pH. The energy consumption value were decreased above and below the original pH value. The highest removal efficiencies for COD and TF were %60 and %95, respectively under operating conditions as 25 ml/min flow rate and 20 A current intensity.

ÖZET: Antep fıstığı işleme sanayi atıksularının sürekli sistem elektrokoagülasyon prosesiyle arıtım verimini etkileyen parametreler incelenmiştir. Anot elektrot malzemesi olarak elektrokoagülasyon prosesinde alüminyum kullanılmıştır. Katot elektrot malzemesi olarak paslanmaz çelikten imal edilmiş elektrokimyasal reaktör kullanılmıştır. Deneysel çalışmalar sürekli modda gerçekleştirilmiştir. Kullanılan anot elektrot 5 mm et kalınlığında, 60 mm dış çaplı, 650 mm yüksekliğe sahip boru tipi elektrottur. Katot elektrot olarak 3 mm et kalınlığına, 70 mm iç çapa, 650 mm yüksekliğe sahip paslanmaz çelikten imal edilmiş reaktör kullanılmıştır. Elektrotlar arası mesafe 5 mm olarak seçilmiştir. Giderim verimine etki eden deneysel parametreler olarak, atıksu başlangıç pH değeri ve atıksu debisi seçilmiştir. Elektrokoagülasyon prosesi ile yapılan deneysel çalışmaların optimum şartlarında KOİ ve toplam fenol (TF) giderim verimleri sırasıyla %70 ve %92 olarak elde edilmiştir.Anahtar kelimeler: Alüminyum elektrot, atıksu arıtımı, elektrokoagülasyon ABSTRACT: The parameters affecting treatment efficiency of pistachio processing industry waste waters was investigated by continuous electrocoagulation process. Aluminum is used as the anode electrode material in the electrocoagulation process. Electrochemical reactor made of stainless steel was used as a cathode electrode material. Experimental studies carried out in continuous mode. The anode electrode used is an electrode which has 5 mm thick , 60 mm outer diameter , a tubular having 650 mm height. A reactor made of stainless steel with 3 mm wall thickness, 70 mm internal diameter, 650 mm height is used as cathode electrode. Distance between the electrodes is chosen as 5 mm. The initial pH value of waste water and waste water flow rate are chosen as the experimental parameters effecting the removal efficiency. In optimum conditions of experimental studies performed by the electrocoagulation process, COD and total phenol (TF) removal efficiencies were obtained respectively 70% and 92%.