Lima Letícia S M S, De Almeida Ronei, Quintaes Bianca R, Bila Daniele M, Campos Juacyara C
a Department of Inorganic Processes, School of Chemistry , Federal University of Rio de Janeiro , Rio de Janeiro , Brazil.
b Applied Research Management , Municipal Company of Urban Cleaning (COMLURB) , Rio de Janeiro , Brazil.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2017 Jul 29;52(9):828-836. doi: 10.1080/10934529.2017.1312182. Epub 2017 Apr 27.
This study aimed to evaluate the use of coagulation/flocculation and Fenton processes for the removal of the recalcitrant component, in particular humic substances, from two different leachates generated in the Gericinó and Gramacho landfills in Rio de Janeiro State (Brazil). A coagulation/flocculation process, using FeCl·6HO as the coagulant, was applied to the two leachate samples. In the case of the leachate from Gericinó landfill, the treatment removed 93% of color, 71% of TOC, 69% of COD, 76% of HS, 73% of humic acids (HA) and 82% of fulvic acids (FA). In addition, there was a 75% reduction in the absorbance at 254 nm, using 3,000 mg L of coagulant. In the case of the leachate from Gramacho landfill, the treatment removed 91% of color, 69% of TOC, 68% of COD, 77% of HS, 75% of HA and 80% of FA. In addition, there was a 70% reduction in the absorbance at 254 nm using the same concentration of coagulant (3,000 mg L). The Fenton processes, using FeSO·7HO and HO in a ratio of 1:5, were also applied to the two leachate samples. In the case of the Gericinó leachate, the Fenton treatment removed 95% of color, 75% of TOC, 68% of COD, 82% of HS, 77% of HA and 93% of FA. In addition, there was a 93% reduction in the absorbance at 254 nm. In the case of the Gramacho leachate, the Fenton treatment removed 93% of color, 73% of TOC, 71% of COD, 81% of HS, 76% of HA, 90% of FA, and there was an 84% reduction in the absorbance at 254 nm. The results of humic substances, color, organic matter and aromatic organic matter (absorbance at 254 nm) demonstrate that the coagulation/flocculation and Fenton processes were efficient in the removal of recalcitrant organic matter from landfill leachates.
本研究旨在评估采用混凝/絮凝和芬顿工艺去除巴西里约热内卢州热里西诺和格拉马乔垃圾填埋场产生的两种不同渗滤液中难降解成分，特别是腐殖质的效果。采用FeCl₃·6H₂O作为混凝剂，对两种渗滤液样品进行了混凝/絮凝处理。对于热里西诺垃圾填埋场的渗滤液，该处理去除了93%的色度、71%的总有机碳（TOC）、69%的化学需氧量（COD）、76%的腐殖质（HS）、73%的腐殖酸（HA）和82%的富里酸（FA）。此外，使用3000mg/L的混凝剂时，254nm处的吸光度降低了75%。对于格拉马乔垃圾填埋场的渗滤液，该处理去除了91%的色度、69%的TOC、68%的COD、77%的HS、75%的HA和80%的FA。此外，使用相同浓度（3000mg/L）的混凝剂时，254nm处的吸光度降低了70%。还采用FeSO₄·7H₂O和H₂O₂按1:5的比例对两种渗滤液样品进行了芬顿处理。对于热里西诺渗滤液，芬顿处理去除了95%的色度、75%的TOC、68%的COD、82%的HS、77%的HA和93%的FA。此外，254nm处的吸光度降低了93%。对于格拉马乔渗滤液，芬顿处理去除了93%的色度、73%的TOC、71%的COD、81%的HS、76%的HA、90%的FA，254nm处的吸光度降低了84%。腐殖质、色度、有机物和芳香有机物（254nm处的吸光度）的结果表明，混凝/絮凝和芬顿工艺在去除垃圾填埋场渗滤液中的难降解有机物方面是有效的。
