Optimization of brewery wastewater with pH changes in electrocoagulation system

Hassan Mahmoudi sharabiani¹ Mehran Khalesi² Zeynab Moradi³ Marjan Vahedi⁴

1) Master s student in the field of environmental engineering (water and wastewater), Faculty of Natural Resources and Environment, Islamic Azad University, Research Sciences Branch, Tehran
2) PhD student in the field of environmental engineering (water and wastewater), Faculty of Natural Resources and Environment, Islamic Azad University, Research Sciences Branch, Tehran
3) Master of Fundamental particle physics Shahroud University of Technology, Shahroud, Iran
4) Master s Degree in Environmental Engineering (Water Resources), Faculty of Natural Resources and Environment, Islamic Azad University, Research Sciences Branch, Tehran

Publication : 9th.International Congress On Civil Engineering, Architecture & Urban Development(9icsau.ir)
Abstract :
Brewery wastewater is one of the most polluted industrial wastewaters in the world. In this study, the effect of pH and retention time on the removal of TSS, BOD and COD from brewery wastewater by electrocoagulation with iron and aluminum electrodes in acidic and alkaline conditions has been investigated. For this purpose, experiments have been performed with controlled initial pH values in the range of 4-10 and retention time of 15-45 minutes. The process was a batch that was performed with 1000 mL of wastewater in EC cell. The electrodes is used up in the EC process with a dimension of 5.3 × 10 × 0.1 cm, respectively. Also, three types of Fe-Fe, Fe-Al and Al-Al electrodes were used in the laboratory. The results showed that the optimal removal efficiency took place at a retention time of 45 minutes and a pH of 4.3.The amount of TSS, BOD, and COD decreased from 2540, 2870, and 12400 mg/L to 526, 608, and 2666 mg/L, respectively, which had 79.3, 78.5, and 78.8% efficiency, respectively. The highest efficiency was observed in Al-Al electrodes. COD removal efficiency of 82.6%, BOD 80.5% and TSS 81.1% were observed in these electrodes. PH changes and choosing the right electrode for industrial wastewater treatment are very important.
Keywords : brewery wastewater electrocoagulation pH impact retention time