Electrocoagulation mechanism for COD removal

<bold>The efficiency of electrocoagulation using aluminum electrodes</bold>i<bold>n treating wastewater from a dairy industry</bold>

“…The rise in the pH of the effluent was also observed by MORENO-CASILLAS et al (2007). The distance between electrodes was not a significant factor for organic matter removal under the tested conditions.…”

“…In the study presented here, the effluent had a high concentration of dissolved solids, representing 80% of total solids. The removal efficiency is related to the predominant type of solid fraction as cited by MORENO-CASILLAS et al (2007) andVALENTE et al (2014). In the case presented here, the predominant fraction of dissolved solids in the effluent of the dairy plant (approximately 80% of total solids) was not efficiently removed, while the TSS removal was favored.…”

“…The rate of reaction will depend on the removal of [H+] via H2 evolution. This reaction will occur fast for low pH values (MORENO-CASILLAS et al, 2007). In addition it was demonstrated that too high pH will increase Al(OH)3 solubility and lead to the formation of soluble AlO2 (ADHOUM & MONSER, 2004).…”

Comparison of electrocoagulation using iron and aluminium electrodes for biogas production wastewater treatment

“…The highest COD and TDS removal efficiency was also found at pH of 6.3. On the other hand, lowest COD and TDS removal efficiency occurred at pH of 4 where Al(OH)3 had lowest dissolution [9]. Fe (II) and Fe (III) were dissolved at pH lower than 4 then the effective color removal efficiency could be obtained at initial pH of 4.…”

Elektrokoagülasyon Reaktöründe Bulanik Kontrol Metodu İle Ph, İletkenli̇k Ve Sicakliğin Eş Zamanli Kontrolü

“…EC prosesinde meydana gelen aşamalar: elektrodun (Al, Fe gibi) yükseltgen çözünmesi ile koagülant oluşturması, kirleticilerin kararsızlaşması, partikül süspansiyonu ve emülsiyon kırılması ve son olarak kararsız fazlarda flokların toplanması şeklinde gerçekleşmektedir [12,13]. EC'da anot olarak çözünen demir veya alüminyum elektrotlar kullanılması halinde bu elektrotlar çözünerek [14][15][16][17][18]. Elektrokimyasal proseste anotta yükseltgenme, kattotta ise indirgenme olur (R1-R6).…”