Abstract
Batch ozonation was performed to assess its efficacy as a pretreatment for reverse osmosis (RO) membranes for treating leachate with high concentrations of recalcitrant organic compounds. Leachate samples from two different landfills were collected and characterized. The modified fouling index (MFI) was used to estimate the fouling potential of raw and ozonized leachates. A response surface experimental design was applied to optimize operational pH and ozone dose. The results demonstrate that the best operational conditions are 1.5 g/L of O3 at pH 12.0 and 1.5 g/L of O3 at pH 9.0 for Landfills 1 and 2, which reduce MFI by 96.22% and 94.08%, respectively. Additionally, they show toxicity factor decays of 98.44% for Landfill 1 and 93.75% for Landfill 2. These results, along with the similar behavior shown by leachate samples from distinct landfills, suggest that ozonation is a promising technology to fit this kind of wastewater into the requirements of RO membranes, enabling their use in such treatment.
Highlights
Landfill is the most used technology for the treatment of municipal solid waste (MSW)worldwide [1]
It was assessed by means of the direct impact of ozonation on the reduction of fouling potential of leachates from two distinct sanitary landfills located on the metropolitan region of Rio de Janeiro State (Brazil), both presenting an elevated amount of recalcitrant organic matter
BOD5 /COD ratios, which indicates that the pretreated samples are even less susceptible to biological treatments than the raw ones. This behavior does not follow what is likely to happen for wastewaters that undergo advanced oxidation processes (AOP) processes, which are frequently used for increasing the biodegradability of organic loads [22,37]
Summary
Landfill is the most used technology for the treatment of municipal solid waste (MSW). Lee et al [26] reported the use of an ozone dose of 0.1 mg of O3 for each mg of suspended solid in the permeate flux of a microfiltration membrane used to treat sewage and observed slight improvements in the permeate flux over time In this scenario, the goal of this work is to evaluate the efficacy of the ozonation process to work as a single-step pretreatment to RO membranes in the treatment of recalcitrant landfill leachate. The goal of this work is to evaluate the efficacy of the ozonation process to work as a single-step pretreatment to RO membranes in the treatment of recalcitrant landfill leachate It was assessed by means of the direct impact of ozonation on the reduction of fouling potential of leachates from two distinct sanitary landfills located on the metropolitan region of Rio de Janeiro State (Brazil), both presenting an elevated amount of recalcitrant organic matter. The findings of this work are expected to generate relevant information concerning the viability of this treatment option for landfill leachate worldwide
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