Microcontaminant degradation in municipal wastewater treatment plant secondary effluent by EDDS assisted photo-Fenton at near-neutral pH: An experimental design approach

Abstract

a b s t r a c tThis work aims to evaluate the applicability of EDDS (ethylenediamine-N,N -disuccinic acid) as an iron chelating agent for photo-Fenton treatment of municipal wastewater spiked with organic contaminants at near-neutral pH. A series of laboratory scale experiments are conducted under simulated sunlight in accordance with a central composite experimental design in order to define the most favorable conditions in terms of initial iron concentration (maintaining a molar ratio 1:2 of Fe:EDDS), H 2 O 2 and pH. The system is evaluated in terms of degradation efficiency, H 2 O 2 consumption and iron availability. The simulated system has been compared in terms of degradation efficiency with a 60 L compound parabolic collector (CPC), and significant correlation has been observed. An approach for estimating near-optimal regions of operability is also demonstrated.

Effect of temperature and photon absorption on the kinetics of micropollutant removal by solar photo-Fenton in raceway pond reactors

“…The photo-Fenton process has been widely studied for organic pollutant removal in aqueous solutions covering different operating conditions with industrial and municipal wastewaters [5,[9][10][11]. The photo-Fenton process involves the generation of hydroxyl radicals (HO Å ) by the reaction between hydrogen peroxide and iron in acidic medium, under natural or artificial UV irradiation.…”

Solar photo-Fenton and UV/H 2 O 2 processes against the antidepressant Venlafaxine in urban wastewaters and human urine. Intermediates formation and biodegradability assessment

“…However, at this pH HO 2 Å is formed in higher quantities and indirectly helps the Fe 2+ formation through the Eq. (13) [38]. The soluble iron species have very different rate constants reported, which practically means that their participation in redox reactions depends on the distribution of these species (Fe 2+ , FeOH + , and solid Fe(OH) 2 ) [36].…”

Iohexol degradation in wastewater and urine by UV-based Advanced Oxidation Processes (AOPs): Process modeling and by-products identification

“…Note the mixed axes scales. Papoutsakis et al, 2015b). This method allows the simultaneous optimization of several equations.…”