C-, N-DBP formation and quantification by differential spectra in MBR treated municipal wastewater exposed to chlorine and chloramine

Uv/Tio2 Photocatalysis as Post-Treatment for Anaerobic Membrane Bioreactor Effluent for Reuse

“…Under the optimal operational conditions such as 1 g/L and 40 W/ m 2 , with respect to achieving high DOM removal performance, a significant amount of HA and soluble microbial products (SMP) was removed by the UV/TiO 2 photocatalysis and a very low level of AP was observed in the permeate produced by both MBRs. This has led to a significant reduction of primary halogenated DBP precursors (Bond et al, 2011;Ma et al, 2016), which ultimately would lead to low DBP formation during the use of chlorine based pathogen control strategies for recycled water distribution (Capocelli and Piemonte, 2021). This is similar to the results reported by Gora and Andrews (2017) that TiO 2 photocatalysis can reduce the DBP formation potential of surface water with an treatment time over 30 min.…”

“…As DOC is a component of dissolved organic matter (DOM) (Moody and Worrall, 2017), monitoring the removal of DOM can also offer a more comprehensive view of the overall photocatalysis process, as well as a potential view of the variation of primary halogenated DBP precursors (Bond et al, 2011;Ma et al, 2016). Therefore, the removal percentage of each measured DOM fraction was calculated with the fluorescence integrated composition analysis results (Fig.…”

A comparative evaluation of reverse osmosis membrane performance when combined with anaerobic or aerobic membrane bioreactors for indirect potable reuse applications

“…AP is reported to have a low molecular weight (MW) and hydrophobicity [63]; FA [64] and SMP [65] a higher MW compared to AP and neutral hydrophobic and hydrophilic moieties; and HA a high MW and hydrophilic moieties [50]. Therefore, since a significant amount of HA was rejected by the RO membrane and a very low level of SMP was observed in the permeate produced by both MBRs, this has arguably led to a reduction of primary halogenated DBP precursors [66,67], which ultimately would lead to low DBP formation during chlorine or chloramine disinfection for reused water distribution. Since similar fluorescence intensity maps were generated, the AnMBR and AeMBR effluent may have a similar fouling behaviour in terms of DOM, while HA can be hypothesised to have an insignificant role during the RO filtration.…”

Disinfection Processes

“…A study was conducted to assess the efficiency of water chlorination and ozonation in transforming ranitidine and eliminating its NDMA formation potential (NDMA-FP) by determining moietyspecific reaction kinetics, stoichiometric factors, and elimination levels in real water matrices.The NDMA-FP decreased significantly only when chlorine reacted with the less reactive tertiary amine or furan moiety. Ozone reacted rapidly with all four moieties of ranitidine and its reaction with the tertiary amine or furan moiety led to complete elimination of the NDMA-FP Ma, Xia, Gao, Yue and Wang (2016). reported that formation of various carbonaceous and nitrogenous DBPs during chlorine and monochloramine disinfection of recycled municipal wastewater produced by MBR and found that THM and HAN formation was related to the halogenation of proteins and humic substances.…”