Pre-treatment of soft drink wastewater with a calcium-modified zeolite to improve electrooxidation of organic matter

Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Rosa Elia Victoria-SalinasPerla Tatiana Almazán-Sánchez

Abstract

Wastewater from soft drink manufacturing, having a high organic load (chemical oxygen demand (COD) = 4,500 mg L-1) and high alkalinity (2,653.7 mg L-1 CaCO3; pH 12), was pretreated with a calcium-modified zeolite to reduce the alkalinity and improve the electrooxidation of organic matter. The natural zeolite clinoptilolite was modified in various ways with Ca(OH)2 and CaCl2. The CaCl2-modified zeolite (ZSACaCl-72h) was more effective for the treatment of soft drink wastewater than the congener modified with Ca(OH)2, where the former reduced the alkalinity by 86% after 8 h. Electrooxidation of soft drink wastewater without zeolite pre-treatment was carried out with boron-doped diamond (BDD) electrodes under the optimal conditions (current intensity: 3 A; sample pH: 12), with 98% and 94.05% reduction of the COD and total organic carbon (TOC), respectively, after 14 h of treatment. Soft drink wastewater pretreated with calcium-modified clinoptilolite was also electrooxidized using the BDD system. The results showed that the pre-treatment was extremely convenient, reducing the treatment time to 6 h compared to the electrooxidation of wastewater. At a current intensity of 3 A, the treatment time was 8 h, with 100% reduction of colou...Continue Reading

References

Mar 31, 2005·American Journal of Public Health·Renee D Goodwin, William W Eaton
May 4, 2005·Cancer Chemotherapy and Pharmacology·Hui WangDonald L Hill
Jan 6, 2012·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·M A García-MoralesP Balderas-Hernández
Nov 20, 2012·Journal of Hazardous Materials·Nejmeddine Rabaaoui, Mohamed Salah Allagui
Jun 4, 2016·Environmental Technology·Ivonne Linares HernándezVioleta Lugo Lugo

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