Characterization and fate of effluent organic matter treated with UV/H2O2 and ozonation

Removal of organophosphate esters from municipal secondary effluent by ozone and UV/H2O2 treatments

“…The reactive OPEs were removed by more than 90% in the first 10 min (H 2 O 2 consumption = 2.3 mg L À1 ); while after 1 h reaction, the recalcitrant TCPP, TDCP, TCEP and TEHP were only removed by 72%, 53%, 61% and 65%, respectively. On the one hand, UV irradiation of HA may produce Å OH and other secondary oxidants to enhance the removal of organic pollutants [30]; on the other hand, the removal of organic pollutants may be inhibited because HA competes for not only UV light against H 2 O 2 but also Å OH against target pollutants [15,31]. In this study, the inhibitory effect of HA seemed to dominate in the degradation of target OPEs by UV/H 2 O 2 .…”

A critical review on characterization strategies of organic matter for wastewater and water treatment processes

“…In another study to investigate the effects of solar radiation on the MW size distribution from fulvic acids in pulp mill effluents, Carvalho et al (2008) also observed that high MW fractions were readily photo-degraded to low MW constituents. Similarly, González et al (2013) recently found that a large reduction of biopolymers (MW > 20,000 Da) and humic substances (MW 800-1000 Da) in treated wastewater to low MW fractions was observed by pre-treatment with ozone or UV/H 2 O 2 . Moreover, the MW size distribution characteristics of DOM have also been proven to have an effect on the toxicity and mobility of its associated pollutants (Al-Reasi et al, 2013).…”

“…More recently, HPLC-SEC is often conducted with sequential online detectors, such as organic carbon detector (OCD), organic nitrogen detector (OND) or UV detector at 254 nm (UVD), called LC-OCD-OND-UVD. This method has been known as a powerful tool to separate the pool of DOM into five major fractions with different MW sizes, including (i) biopolymers (MW >10,000 Da); (ii) humic substances (MW 800-1000 Da); (iii) building blocks (MW 350-500 Da); (iv) low MW acids (MW <350 Da); and (v) low MW neutrals (MW <350 Da) (Kennedy et al, 2005;Huber et al, 2011;Al-Reasi et al, 2013;González et al, 2013).…”

“…However, AOPs are normally used to partially oxidize non-biodegradable OM with high molecular weight or recalcitrant OM to more biodegradable compounds due to the large consumption of energy and chemicals for complete oxidation and mineralization. The efficiency of AOPs in wastewater reclamation is influenced not only by the concentrations of OM but also by its physicochemical properties and molecular weight (Selcuk et al, 2006;González et al, 2013;Molnar et al, 2013). More recently, it has been demonstrated that the formation processes of disinfection by-products (DBPs) during chlorination and chloramination of secondary effluent for the production of high quality recycled water is affected by both the concentrations of DOM and DOM characteristics (Zhuo et al, 2001;Zhang et al, 2009;Doederer et al, 2014;Ma et al, 2014).…”

“…In addition to membrane technologies, the applications of advanced oxidation processes (AOPs), such as catalytic ozonation (He et al, 2013), Fenton/photo-Fenton oxidation (Nousheen et al, 2014), and photocatalytic oxidation involving UV/H 2 O 2 (Shon et al, 2007;González et al, 2013) have been recognized as high potential technologies for wastewater reclamation and water reuse. However, AOPs are normally used to partially oxidize non-biodegradable OM with high molecular weight or recalcitrant OM to more biodegradable compounds due to the large consumption of energy and chemicals for complete oxidation and mineralization.…”