N.Pınar TANATTI, İ. Ayhan ŞENGİL, Halil AKSU, MERYEM MEHMETBAŞOĞLU

Biyodizel atıksularında elektrokoagülasyon yöntemi ile MEOH ve KOİ gideriminin araştırılması

Biyodizel atıksuları yüksek miktarda yağ, metanol, sabun ve gliserin içermektedir.Biyodizel üretiminin yaygınlaşmasının önündeki en büyük engellerden biri içerdiği yüksek kirlilik yükü nedeniyle geleneksel arıtma yöntemleri kullanılarak arıtılamamasıdır ve durum araştırmacıların oldukça ilgisini çekmektedir. Bu çalışmanın ana amacı, transesterifikasyon yöntemiyle üretilen biyodizel atıksularının laboratuvar ölçeğinde elektrokoagülasyon yöntemi ile kesikli bir reaktörde arıtılabilirliğinin incelenmesidir. EC prosesinde, başlangıç atıksu pH değeri 6, tuz miktarı 0,5 g/L, akım yoğunluğu 0,7 mA/cm2 ve elektroliz süresi 2 dakika belirlenmiştir. 2 dakikalık elektrokogülasyon prosesi sonucunda %64,2 MeOH ve %95,8 KOİ giderme verimleri elde edilmiştir. Bu sonuçlara göre MeOH ve KOİ gideriminde işletme boyunca elektrokoagülasyon yöntemi daha yüksek miktarda MeOH ve KOİ giderimi sağlanmaktadır.

Treatment of MeOH and COD removal in biodiesel wastewaters by electrocoagulation

The main components of the wastewater are the residual remaining oil, methanol, glycerol, soap. In general, wastewater from the biodiesel processing industry contains high concentrations of COD, TOC, Glycerol, methanol and oil and/or grease such as 250 000- 450 000 mg L-1, 54 000- 110 000 mg L-1 , 800-1500 mg L-1 , 6 000- 15 000 mg L-1 and 15 000 mg L-1, respectively. In this respect, biodiesel wastewater should not be discharged into public drainage because the oil causes clogging of the drainage and decreases biological activity in sewage treatment. The initial aim of this study is, investigation of, treatability of the biodiesel washing water, maintained by the esterification process with fulfillmentlaboratory scale studies. In this study, the treatment of biodiesel wastewater by electrocoagulation was investigated carried out in a batch reactor. Removal efficiencies for 64.2% of MeOH and 95.8% KOİ were obtained at wastewater inital pH 6, NaCl dose 0.5 g/L, current density of 0.7 mA/cm2 and 2 min of operating time. According to these results, MeOH and COD removal are provided by the electrocoagulation method during operation at a higher amount of MeOH and COD removal.

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