Removal of organic matter of electrodialysis reversal brine from a petroleum refinery wastewater reclamation plant by UV and UV/H202 process

• Published in: Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Vol. 53; no. 5; pp. 430 - 435
• Main Authors: Moser, Priscila B., Ricci, Bárbara C., Alvim, Clara B., Cerqueira, Ana C. F., Amaral, Míriam C. S.
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 16.04.2018; Taylor & Francis Ltd
• Subjects: Anions; Bicarbonates; Carbonates; Chemical oxygen demand; Direct photolysis; EDR brine; Electrodialysis; Hydrogen peroxide; hydrogen peroxide-assisted photolysis; Mineralization; Organic compounds; Organic matter; petroleum refinery wastewater reclamation plant; Photolysis; Reclamation; Refineries; Refinery wastes; Saline water; Wastewater; Wastewater renovation; Wastewater treatment; Water reclamation; water reuse; United States > US
• ISSN: 1093-4529; 1532-4117
• DOI: 10.1080/10934529.2017.1409580

Direct (UV) and hydrogen peroxide-assisted (UV/H 2 O 2 ) photolysis were investigated in bench-scale for removing the organic compounds present in the electrodialysis reversal (EDR) brine from a refinery wastewater reclamation plant. In the UV/H 2 O 2 experiments, a COD:H 2 O 2 molar ratios of 1:1, 1:2 and 1:3 were tested by recirculating the brine in the UV reactor for 120 min. Results showed a significant reduction in UVA 254 , whereas no reduction was observed for chemical oxygen demand (COD), in the UV process, suggesting great cleavage but limited mineralization of the organic matter. UV/H 2 O 2 with C:H 2 O 2 ratio of 1:3 exhibited high efficiency in removing the organic matter (COD removal of 92% with an electrical energy per removal order (E EO ) value of 22 kW h m −3 ). Although the EDR brine has high salinity, no strong scavenging effect of *OH was found in the water matrix due to the high concentration of anions, especially chloride and bicarbonate. Finally, UV/H 2 O 2 with C:H 2 O 2 ratio of 1:3 and residence time of 120 min is an efficient alternative for organic matter removal of EDR brine from refinery wastewater reclamation plant showing total capital cost (CapEx) estimated at US$ 369,653.00 and total operational cost (OpEx), at US$ 1.772 per cubic meter of effluent.