Bioassays and Zahn-Wellens test assessment on landfill leachate treated by photo-Fenton process. Issue 1 (February 2018)

• Record Type: Journal Article
• Authors: Welter, Júlia Bitencourt; Soares, Elisa Veridiani; Rotta, Eduardo Henrique; Seibert, Daiana
• Is Part Of: Journal of environmental chemical engineering. Volume 6:Issue 1(2018)
• Page Start: 1390
• Page End: 1395
• Publication Date: 2018-02
• Subjects: Phytotoxicity -- Biodegradability -- Lactuca sativa -- Advanced oxidation process -- Wastewater; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2018.01.059
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Landfill leachates are a complex wastewater originated by the decomposition of organic matter combined with pluvial water percolation. The complex and variable composition of this wastewater provides acute and chronic toxicity, in addition to resistance to biological processes. This requires an advanced treatment, such as photo-Fenton technique. This study aims to evaluate the phytotoxicity and the biodegradability improvements of samples of landfill leachates treated by photo-Fenton using oxalate and citric acids as organic ligands. Some parameters were analyzed to support this research, such as total organic carbon (TOC), chemical oxygen demand (COD), biochemical oxygen demand (BOD5 ) and simple aromatic compounds (Abs. 254 nm). Removals of simple aromatic compounds achieved 44% and 31% for oxalic and citric acids, respectively. TOC removals of 47% for ferrioxalate and 33% for ferricitrate were obtained. The biodegradability had an improvement, evidenced by the increase in the BOD5 /COD ratio (0.18 to 0.39) and by the Zahn-Wellens test (Dt > 70%). Regarding the phytotoxicity, the absolute germination, relative radical growth, relative hypocotyl growth and LC50 values indicate that the photo-Fenton process provides great enhancements. For the evaluated parameters, the best results regarding the toxicity and biodegradability assessments were provided by the ferricitrate complex.