Removal of haloacetic acids by nanofiltration

Ratasuk, Chalatip; Chawalit, Ratanatamskul; Ratasuk, Nopawan

doi:10.1016/s1001-0742(09)60017-6

Cited by 42 publications

(22 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Adsorption, size exclusion, and electrostatic repulsion may affect the rejection rates of trace organic compounds (Yangali-Quintanilla et al, 2009;Van der Bruggen et al, 1999;Berg et al, 1997). In terms of DBP rejection by RO membranes, it has been reported that removal efficiencies of THMs and HAAs were >60% and >90%, respectively (Xu et al, 2005;Chalatip et al, 2009;Kimura et al, 2003;Van der Bruggen and Vandecasteele, 2003;Waniek et al, 2002). A relatively high rejection of HAAs is attributed to their pKa values that are lower than the typical operating pH of RO processes.…”

Section: Rejection Of Dbps By Ro Membranesmentioning

confidence: 99%

Disinfection by-product formation during seawater desalination: A review

2015

View full text Add to dashboard Cite

Due to increased freshwater demand across the globe, seawater desalination has become the technology of choice in augmenting water supplies in many parts of the world. The use of chemical disinfection is necessary in desalination plants for pre-treatment to control both biofouling as well as the post-disinfection of desalinated water. Although chlorine is the most commonly used disinfectant in desalination plants, its reaction with organic matter produces various disinfection by-products (DBPs) (e.g., trihalomethanes [THMs], haloacetic acids [HAAs], and haloacetonitriles [HANs]), and some DBPs are regulated in many countries due to their potential risks to public health. To reduce the formation of chlorinated DBPs, alternative oxidants (disinfectants) such as chloramines, chlorine dioxide, and ozone can be considered, but they also produce other types of DBPs. In addition, due to high levels of bromide and iodide concentrations in seawater, highly cytotoxic and genotoxic DBP species (i.e., brominated and iodinated DBPs) may form in distribution systems, especially when desalinated water is blended with other source waters having higher levels of organic matter. This article reviews the knowledge accumulated in the last few decades on DBP formation during seawater desalination, and summarizes in detail, the occurrence of DBPs in various thermal and membrane plants involving different desalination processes. The review also identifies the current challenges and future research needs for controlling DBP formation in seawater desalination plants and to reduce the potential toxicity of desalinated water.

show abstract

Section: Rejection Of Dbps By Ro Membranesmentioning

confidence: 99%

Disinfection by-product formation during seawater desalination: A review

2015

View full text Add to dashboard Cite

show abstract

“…The removal of trace organic contaminants by RO and NF membranes has been studied quite extensively, with studies assessing the impact of molecular properties [10,11] and membrane operations, such as feed pressure, transmembrane flux, crossflow velocity, ionic strength and pH [12][13][14][15][16][17][18]. Research on small organic solutes in general and DBPs in particular however is very limited with only a small number of studies looking at either THMs, HAAs, HANs or Nnitrosamines [16][17][18][19][20][21][22][23][24][25][26]. Rejection of N-nitrosodimethylamine (NDMA) by RO membranes has been reported to be between 10 and 40% [27,28] whereas rejections of above 50% have been found for HANs [23,26].…”

Section: Introductionmentioning

confidence: 99%

“…Rejection of N-nitrosodimethylamine (NDMA) by RO membranes has been reported to be between 10 and 40% [27,28] whereas rejections of above 50% have been found for HANs [23,26]. On the other hand, removal efficiencies of HAAs have been reported above 90% [20,24] and THM rejections have generally been reported above 60% [22,25]. Among these different published studies, operational factors and solute properties 6 have only been reported for N-nitrosamines in the studies by Fujioka et al [18] and Steinle-Darling et al [28].…”

Section: Introductionmentioning

confidence: 99%

Rejection of disinfection by-products by RO and NF membranes: Influence of solute properties and operational parameters

Doederer

Farré

Pidou

et al. 2014

Journal of Membrane Science

105

View full text Add to dashboard Cite

100-200words)The objective of this study was to determine the influence of solute properties and operational parameters on disinfection by-product (DBP) rejection by reverse osmosis (RO) and nanofiltration (NF) membranes. This was achieved by assessing the removal efficiency for 29 DBPs likely to be formed during disinfection of secondary effluents. The DBPs investigated were trihalomethanes, iodinated-trihalomethanes, haloacetonitriles, chloral hydrate, haloketones, halonitromethanes and haloacetamides.The performance of an NF and a low pressure RO membrane was investigated within a range of different pHs, temperatures, transmembrane fluxes, crossflow velocities and ionic strengths. Rejection decreased significantly with increasing temperature and decreasing transmembrane flux, while the influence of the other operational parameters was minimal with a few exceptions detailed in the manuscript.Multiple linear regression was used to determine the physico-chemical solute properties contributing significantly to DBP rejection. For NF, geometric parameters were revealed to be the dominant molecular descriptors influencing rejection, whereas for RO, besides size exclusion, solute-membrane interaction played an important role. A predictive model based on multiple linear regression was established that could forecast rejection of DBPs as a function of membrane operation parameters and DBP properties. 2 Abbreviations BCAcAm Bromochloroacetamide BCAN Bromochloroacetonitrile BCIM Bromochloroiodomethane BDCAcAm Bromodichloroacetamide BDCM Bromodichloromethane BDIM Bromodiiodomethane BIAcAm Bromoiodoacetamide CDIM Chlorodiiodomethane CH Chloral hydrate CIAcAm Chloroiodoacetamide DBAcAm Dibromoacetamide DBAN Dibromoacetonitrile DBCAcAm Dibromochloroacetamide DBCM Dibromochloromethane DBIM Dibromoiodomethane DBP Disinfection by-product DCAcAm Dichloroacetamide DCAN Dichloroacetonitrile DCIM Dichloroiodomethane DHAN Dihalogenated acetonitriles DIAcAm Diiodoacetamide DM Dipole moment GC-ECD Gas chromatograph with electron capture detector HAA Haloacetic acids HAcAm Haloacetamides HAN Haloacetonitriles 4 HK Haloketones HNM Halonitromethanes

show abstract

“…NF is also suggested for the removal of halogenated acetic acids (chloro-, dichloro-, and trichloroacetic acid; and bromo-and dibromoacetic acid) from water (Chalatip, Chawalit, & Nopawan, 2009). The high reduction in HAA content compared with an open negatively charged sulfonated polysulfone NTR7410 membrane and a neutral NTR729HF polyvinyl alcohol membrane (all membranes by Nitto Denco Corp., Japan) was found for dense negatively charged ES10 aromatic polyamide membranes.…”

Section: Oxidation and Dbpsmentioning

confidence: 99%

Membrane technologies for the removal of micropollutants in water treatment

Bodzek

2015

Advances in Membrane Technologies for Water Treatment

View full text Add to dashboard Cite

Removal of haloacetic acids by nanofiltration

Cited by 42 publications

References 18 publications

Disinfection by-product formation during seawater desalination: A review

Disinfection by-product formation during seawater desalination: A review

Rejection of disinfection by-products by RO and NF membranes: Influence of solute properties and operational parameters

Membrane technologies for the removal of micropollutants in water treatment

Contact Info

Product

Resources

About