Removal of PAHs from leachate using a combination of chemical precipitation and Fenton and ozone oxidation

Abstract

In this study, six emerging pollutants, belonging to the polycyclic aromatic hydrocarbons (PAHs) group, found in landfill leachate were investigated for their removal by sequential treatment processes including chemical precipitation (CP), Fenton oxidation (FO) and ozone oxidation (OO). Each treatment process was run under different conditions using an experimental design program. Optimization of both CP and FO processes was designed based on the measured values of the residual chemical oxygen demand (COD) of the samples analyzed. The analysis of variance test was applied to the obtained results for determination of statistical significance of the model. Removal efficiencies of micropollutants were determined in the optimal conditions both for CP and FO processes. Samples obtained after these processes were treated with different pH and ozonation times for observing the performances of ozonation on micropollutant removal under different operating conditions. In this study, the removal of acenaphthylene, acenaphthene, fluorene, phenanthrene, fluoranthene and pyrene micropollutants was investigated. The values obtained for PAHs in leachate were determined to be above 10 ppb. In the CP process, the removal efficiencies for PAHs were ranged between 6% and 40% except for pyrene. Removal efficiencies of all micropollutants with FO were over 70% except for fluorene (55%). The removal efficiencies of the investigated micropollutants were 80–100% as a result of consecutive treatment processes including CP, FO and OO respectively.

Comprehensive review of polycyclic aromatic hydrocarbons in water sources, their effects and treatments

“…The removal efficiency reached up to 94% for naphthalene. Ates and Argun (2018) investigated PAHs removal by Fenton and ozone oxidation and found that the removal efficiencies ranged between 6% and 40%. Lin C et al (2014) found that ozone has been efficiently applied in an advanced oxidation process (AOP) for treatment of various organic pollutants due to its high oxidation and disinfection potential.…”

Naphthalene mineralization by supercritical water oxidation and determination of by-products using non-target analysis

“…Also, anaerobic degradation of some organic matters can lead to the PAH formation (Argun et al 2020;Nas et al 2020). Therefore, naphthalene was detected in high levels (0.01-15 μg/L) in many aquatic environments (Staples et al 1985;Kalmykova et al 2014;Oturan et al 2015;Ates & Argun 2018;Argun et al 2020). All living creatures are exposed to naphthalene direct (inhalation, ingestion, and dermal contact, oral) or indirectly (food chain).…”

XAD-2 resin modified by nanosecond pulsed discharge to improve the adsorption capacity of polycyclic aromatic hydrocarbons

“…Primary technologies for PAHs removal include photocatalytic degradation, oxidation, electrolysis, chemical precipitation, biodegradation, and adsorption, etc [6][7][8][9][10]. Among them, the adsorption is one of the most attractive and effective techniques to remove trace PAHs from the atmosphere (allowable concentration in ppt to ppb) in an economical and environmental friendly manner.…”