scholarly journals Comparison of the effects of chloramine and chlorine on the aromaticity of dissolved organic matter and yields of disinfection by-products

Chemosphere ◽  
2018 ◽  
Vol 191 ◽  
pp. 477-484 ◽  
Author(s):  
Mingquan Yan ◽  
Paolo Roccaro ◽  
Massimiliano Fabbricino ◽  
Gregory V. Korshin
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
By Products

Characterization and Source of Trihalomethane Formation in the Secondary Effluent by Sequencing Batch Reactors

2013 ◽  
Vol 316-317 ◽  
pp. 323-326
Author(s):  
Chao Jie Zhang ◽  
Si Bo Li ◽  
Qian Chen ◽  
Qi Zhou
Keyword(s):  
Organic Matter ◽  
Activated Carbon ◽  
Dissolved Organic Matter ◽  
Secondary Effluent ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Human Beings ◽  
By Products

Dissolved organic matter (DOM) may do harms to human beings. After disinfected by chlorine (amine), DOM can form disinfection by-products (DBPs) which can be mutagenic, teratogenic and carcinogenic. Characterization and source of trihalomethane precursors in the secondary effluent by sequencing batch reactors were investigated. CHCl3 was the primary DBPs. The results showed that the precursors of CHCl3 were mainly strongly hydrophobic DOM, while CHCl2Br and CHClBr2 were mainly formed from hydrophilic DOM. The effects of different powder media (activated carbon, zeolite) on removal of DOM were compared. The results showed that the dosing of powder media can promote the removal of DOM and the DBPs precursors.

scholarly journals The chemodiversity of algal dissolved organic matter from lysed Microcystis aeruginosa cells and its ability to form disinfection by-products during chlorination

2019 ◽  
Vol 155 ◽  
pp. 300-309 ◽  
Author(s):  
Michael Gonsior ◽  
Leanne C. Powers ◽  
Ernest Williams ◽  
Allen Place ◽  
Feng Chen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Microcystis Aeruginosa ◽  
By Products

Tracking the formation of new brominated disinfection by-products during the seawater desalination process

2020 ◽  
Vol 6 (9) ◽  
pp. 2521-2541 ◽  
Author(s):  
Leanne C. Powers ◽  
Annaleise Conway ◽  
Carys L. Mitchelmore ◽  
Stephen J. Fleischacker ◽  
Mourad Harir ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Seawater Desalination ◽  
Ultrahigh Resolution ◽  
By Products ◽  
Resolution Mass

Ultrahigh resolution mass spectrometry revealed substantial dissolved organic matter changes and the formation of numerous bromine-containing disinfection by-products during the seawater desalination process.

scholarly journals Effect of prescribed fires on the export of dissolved organic matter, precursors of disinfection by-products, and water treatability

2020 ◽  
Vol 187 ◽  
pp. 116385
Author(s):  
Habibullah Uzun ◽  
Wenbo Zhang ◽  
Christopher I. Olivares ◽  
Cagri Utku Erdem ◽  
T Adam Coates ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Prescribed Fires ◽  
By Products

Nitrogen enriched dissolved organic matter (DOM) isolates and their affinity to form emerging disinfection by-products

2009 ◽  
Vol 60 (1) ◽  
pp. 135-143 ◽  
Author(s):  
A. Dotson ◽  
P. Westerhoff ◽  
S. W. Krasner
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Free Chlorine ◽  
Treated Wastewater ◽  
Health Concern ◽  
Isolation Method ◽  
By Products ◽  
Potential Conditions

Increased contributions from wastewater discharges and algal activity in drinking water supplies can lead to elevated levels of dissolved organic nitrogen (DON), which can increase the likelihood for the formation of emerging nitrogenous disinfection by-products (N-DBPs) of health concern. Dissolved organic matter (DOM) isolated from five waters, using a newly developed DOM isolation method specific to DON fractionation, produced thirty-four isolates of suitable mass. Each isolate was treated with free chlorine or chloramines under formation potential conditions. The DBP yields were determined for three halogenated DBPs (trichloromethane, dichloroacetonitrile, and trichloronitromethane) and one non-halogenated DBP (N-nitrosodimethylamine [NDMA]). Halogenated DBP yields were greater during the application of free chlorine, however chloramination produced significant levels of halogenated N-DBPs for some isolates. NDMA was only observed to form from selected nitrogen-enriched isolates (DOC/DON ratio < 20 mg/mg), especially those isolated from treated wastewater. Other results indicated that nitrogen-enriched DOM resulted in increased yields of the other N-DBPs studied.

Degradation of UV filters 2-ethylhexyl-4-methoxycinnamate and 4-tert-butyl-4'-methoxydibenzoylmethane in chlorinated water

2013 ◽  
Vol 10 (2) ◽  
pp. 127 ◽  
Author(s):  
A. Joel M. Santos ◽  
Diana M. A. Crista ◽  
Margarida S. Miranda ◽  
Isabel F. Almeida ◽  
José P. Sousa e Silva ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Rate Constant ◽  
Half Life ◽  
Chlorine Concentration ◽  
Solar Irradiation ◽  
Uv Filters ◽  
Tert Butyl ◽  
The Stability ◽  
By Products

Environmental context The increasing use of sun-creams containing UV-filtering chemicals has led to increased inputs of these compounds to the aquatic environment. Chlorinated waters can convert these chemicals into chlorinated products whose toxic effects are of primary concern. To better understand the environmental fate of sun-cream chemicals, we studied the stability of two UV-filtering compounds under varying conditions of pH, chlorine concentration, temperature, dissolved organic matter and solar irradiation. Abstract The stability of the UV filters 2-ethylhexyl-4-methoxycinnamate (EHMC) and 4-tert-butyl-4′-methoxydibenzoylmethane (BDM) in chlorinated water was studied. High-performance liquid chromatography (HPLC)-UV-diode array detection (DAD) was used to follow the reaction kinetics of both UV filters and HPLC-tandem mass spectrometry (MS/MS) was used to tentatively identify the major transformation by-products. Under the experimental conditions used in this work both UV filters reacted with chlorine following pseudo-first order kinetics: rate constant k=0.0095±0.0007min–1 and half-life t1/2=73±4min for EHMC and rate constant k=0.006±0.001min–1 and half-life t1/2=119±14min for BDM (mean±standard deviation). The chemical transformation of the UV filters in chlorinated water led to the formation of chlorinated by-products that were tentatively identified as mono- and dichloro-substituted compounds that resulted from substitution of the hydrogen atoms in the benzene rings by one or two chlorine atoms. Experimental Box–Behnken designs were used to assess the effect of experimental factors: pH, temperature, chlorine concentration, dissolved organic matter and artificial sunlight irradiation on the transformation of the UV filters.

Sign in / Sign up

Export Citation Format

Share Document