Treatment of Sanitary Landfill Leachate Using a Combined Anaerobic Fluidized Bed Reactor and Fenton's Oxidation

Removal of refractory organics in nanofiltration concentrates of municipal solid waste leachate treatment plants by combined Fenton oxidative-coagulation with photo – Fenton processes

“…1, the optimal initial pH was selected at 5.0 based on both COD removal efficiencies and the final pH suitable for the subsequent photo e Fenton treatment. Even though this result does not agree many previous findings (pH < 4) for Fenton oxidation (Gulsen and Turan, 2004;Zhang et al, 2009), the pH titration curves of the LBs indicate the major capacity of alkalinity falls into the pH range 5e7 (data not shown) and the aqueous pH decreased rapidly to around 3.0 after Fenton oxidative-coagulation treatment (see Fig. 1).…”

Trends in the use of Fenton, electro-Fenton and photo-Fenton for the treatment of landfill leachate

“…The ratio of H 2 O 2 /Fe 2+ is required to be kept as low as possible to avoid recombination of hydroxyl radicals and reduce final sludge volume . The optimal doses are determined either (i) by varying Fe 2+ concentration at a fixed random dosage of H 2 O 2 and subsequently optimizing the H 2 O 2 dosage at this Fe 2+ concentration (Gulsen and Turan, 2004;Lau et al, 2001;Wang et al, 2000), (ii) by selecting the best combination of H 2 O 2 and Fe 2+ in terms of COD removal from various combinations (Pala and Erden, 2004), and (iii) by finding the optimal ratio of H 2 O 2 and Fe 2+ followed by the determination of optimal dosages at predetermined ratios (Lopez et al, 2004). Zhang et al (2005) observed that the COD removal performance increased linearly with increase in H 2 O 2 /Fe 2+ molar ratio by 1.5 of molar ratio.…”

Treatment of mature landfill leachate by biofilters and Fenton oxidation

“…It has been studied for its application as a pretreatment or a post treatment step in biological treatment (Kochany and Lipczynska-Kochany, 2009). Technologically simple, the Fenton's process has several advantages: there is no mass transfer limitation (homogeneous nature), neither Fe 2+ nor H 2 O 2 is expensive or toxic, and this method produces less or no secondary pollutants such as chlorinated organic compounds than other methods such as electro-oxidation (Gulsen and Turan, 2004;Lei et al, 2007). Although Fenton oxidation improves biodegradability and BOD/COD ratio, some organic substances still have to be removed through subsequent biological treatment (Li et al, 2009).…”