Removal of Refractory Pollutants from Landfill Leachate Using Two‐Phase System

Abstract

The study focused on the problem of removing refractory substances from leachate treated by means of activated sludge method and advanced oxidation process. Biological treatment was conducted in sequencing batch biofilm reactor. Biologically treated leachate was subject to further chemical treatment with the use of Fenton reagent. The permanent dosage of H2O2 amounting to 2 mg x L(-1) was applied. Fe(II):H2O2 ratio was 1:10, 1:5 and 1:3. Biological treatment allowed for removing 97% of benzene and only 20% of ethylbenzene. There was a 25% decrease in the concentration of volatile organochlorine compounds. The concentration of benzene in chemically treated leachate increased in comparison with the value found in biologically treated leachate and the growth coincided with the decreasing Fe(II):H2O2 ratio. An analysis of polycyclic aromatic hydrocarbons showed that leachate subjected to advanced oxidation contained the sum of polycyclic aromatic hydrocarbons that was lower than in biologically treated leachate, irrespective of Fe(II):H2O2 ratio.

Emerging and advanced membrane technology for wastewater treatment: A review

“…It possesses less fouling potential and leaves fewer footprints during operation. Though fouling can become a severe concern during later stage of operation and it takes longer time during start up to form granules [26].…”

“…For a young leachate, the organic components are much higher as compared to old or matured one. Successful reduction of leachate contaminants can be done using stripping accompanied by flocculation, MBR, and RO therapy [26]. A combination of MBR and electro-oxidation methods can reduce COD and NH + 4 -N and were followed by substantial detoxification [32].…”

The Efficiency of Landfill Leachate Treatment Using the Fenton’s Reagent

“…Hydroxyl radicals efficiently mineralise or convert indecomposable organic compounds to biodegradable forms, which are then removed in biological processes. During reactions between substances dissolved in landfill leachate and Fenton's reagent, compounds with high molecular mass are converted into compounds with low mass, and complex aromatic and aliphatic hydrophobic chains are transformed to substances with the hydrophilic structure [Zhao et al 2013, Koc-Jurczyk 2014. The effectiveness of the process depends on the pH, doses and molar ratio of reactants (Fe 2+ and H 2 O 2 ) and ratios H 2 O 2 /COD as well as Fe 2+ /COD.…”