Abstract
This work aimed at studying the photochemical treatment of a landfill leachate using ultraviolet light, hydrogen peroxide, and ferrous or ferric ions, in a batch recycle photoreactor. The effect of inorganic carbon presence, pH, initial H2O2 amount (0–9990 mg L-1) as well as Fe(II) (200–600 ppm) and Fe(III) (300–700 ppm) concentrations on the total carbon removal and color change was studied. Prior to the photochemical treatment, a pretreatment process was applied; inorganic nitrogen and inorganic carbon were removed by means of air stripping and initial pH regulation, respectively. The leachate sent subsequently for photochemical treatment was free of inorganic carbon and contained only organic carbon with concentration 1200±100 mg L-1 at pH 5.1–5.3. The most favorable concentrations of H2O2 and ferric ions for carbon removal were 6660 mg L-1 and 400 ppm, respectively. Adjusting the initial pH value in the range of 2.2–5.3 had a significant effect on the organic carbon removal. The photo-Fenton-like process was more advantageous than the photo-Fenton one for leachate treatment. By applying the most favorable operating conditions, 88.7% removal of total organic carbon, 100% removal of total inorganic carbon, 96.5% removal of total nitrogen, and 98.2% color removal were achieved.
Highlights
Due to its economic advantage, sanitary landfilling remains the most widely used method for the disposal of municipal solid waste (MSW) in most countries [1]
A pretreatment stage including air stripping and pH adjustment was required for ammonia and inorganic carbon removal before the application of the photochemical process
The inorganic carbon removal was critical for the success of steps because it was indirectly shown to act as hydroxyl radicals scavenger
Summary
Due to its economic advantage, sanitary landfilling remains the most widely used method for the disposal of municipal solid waste (MSW) in most countries [1]. 125 m3 of greenhouse emissions composed of 65% of methane and 34% of carbon dioxide are released per ton of landfilled MSW [2]. A dark, highly toxic with unpleasant smell liquid results from the disintegration of the organic matter of the waste and the infiltration of rainwater through landfills, which is called landfill leachate. It contains high amounts of organic recalcitrant compounds [3] as well as chlorinated organic and inorganic salts, heavy metals, and elevated levels of ammonia-nitrogen [1].
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
