Removal of microcontaminants from MWTP effluents by combination of membrane technologies and solar photo-Fenton at neutral pH

Does micropollutant removal by solar photo‐Fenton reduce ecotoxicity in municipal wastewater? A comprehensive study at pilot scale open reactors

“…Nonetheless, as the pH was stable throughout the experiment (pH 6.5) with EDDS, the posterior effluent neutralization was not required, hence lowering the corresponding operating costs. Furthermore, this complexing agent is biodegradable and environmentally safe, but one drawback is that EDDS can be degraded during the process by photodegradation …”

“…The second strategy involved the use of the complexing agent (S,S)-ethylenediamine-N,N'-disuccinic acid (EDDS) to form the Fe(III)-EDDS complex at a molar ratio of 1:2 (5.5 mg Fe L −1 , 71.6 mg EDDS L −1 ) and 30 mg H 2 O 2 L −1 . 22 Based on our own experience, the amount of hydrogen peroxide used in this study was low enough to be consumed during the process while being high enough to degrade micropollutants. Previous studies on the kinetics of the photo-Fenton process showed that there is a co-variation between micropollutant degradation and H 2 O 2 consumption.…”

“…Solar photo‐Fenton treatment was carried out at initial neutral pH following two strategies: the sequential iron dosage strategy, which was run with four iron additions (5.5 mg Fe L −1 each) at 5 min intervals, and initial concentration of 30 mg H 2 O 2 L −1 . The second strategy involved the use of the complexing agent (S,S)‐ethylenediamine‐N,N'‐disuccinic acid (EDDS) to form the Fe(III)–EDDS complex at a molar ratio of 1:2 (5.5 mg Fe L −1 , 71.6 mg EDDS L −1 ) and 30 mg H 2 O 2 L −1 . Based on our own experience, the amount of hydrogen peroxide used in this study was low enough to be consumed during the process while being high enough to degrade micropollutants.…”

“…Furthermore, this complexing agent is biodegradable and environmentally safe, 26 but one drawback is that EDDS can be degraded during the process by photodegradation. 22 One of the main factors affecting photo-Fenton treatment costs is reagent consumption, especially related to adjusting the pH and hydrogen peroxide. 27 Therefore, a minimum hydrogen peroxide dose was used in this study (30 mg L −1 ), which was completely consumed in both treatments as evidenced by samples taken at 50 min (Fe(III)-EDDS) and 60 min (sequential iron dosage) which gave negligible concentration values with the three replicates.…”

Strategy for Treating a Landfill Leachate by Integration of Physico-Chemical and Photo-Fenton Processes

“…2 Considering the complexity of such effluents, the coupling of different technologies can be a good alternative for treatment. [6][7][8] A previous study 7 has demonstrated that the composition of sanitary landfill leachate does not compromise the efficiency of mineralization by photo-Fenton process, although influences significantly the treatment time and the consumption of H 2 O 2 . It has been reported a significant reduction in the treatment time and amount of H 2 O 2 added, when the treatment via photo-Fenton reactions is preceded by a pre-treatment via coagulation-flocculation.…”