Contribution of amide-based coagulant polyacrylamide as precursors of haloacetamides and other disinfection by-products

Ding, Shunke; Chu, Wenhai; Bond, Tom; Cao, Zhongqi; Xu, Bin; Gao, Naiyun

doi:10.1016/j.cej.2018.06.002

Cited by 35 publications

(13 citation statements)

References 39 publications

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“…On the other hand, its monomer, acrylamide, formed undetectedyields of HAcAms at pH 7, whilst at pH 8 HAcAm yields were significantly reduced after 24 hours (by 89%). Recent studies confirm these findings for the above amide-based coagulants (Ding et al, 2018;Wang et al, 2018); polyacrylamide samples yielded 0.040% M/M of DCAcAm in chlorination and undetectable in chloramination, against 0.034% M/M and undetectable, respectively, in the current study. Similarly, with respect to acrylamide, DCAcAm were 0.11 % M/M during chlorination and undetectable during chloramination, against 0.15 % M/M and undetectable, respectively, in this study (Fig 1.b).…”

Section: Formation Of Nitrogenous Disinfection By-products (Hacams and Hans)supporting

confidence: 90%

“…Previous studies using amines demonstrated that during chloramination chloroform generation was reduced by 66-93% in comparison with the yields during chlorination (Bond et al, 2014). Chloroform formation in 24h from acrylamide/ polyacrylamide was previously reported to be 0.07/0.15 %M/M upon chlorination and 0.14/0.22 % M/M upon chloramination, respectively (Ding et al, 2018); against 0.09/0.09 %M/M in chlorination (pH 8) and 0.05/0.03 %M/M in chloramination (pH 7) in this study.…”

Section: Formation Of Carbonaseous Disinfection By-products (Haas and Thms)mentioning

confidence: 97%

“…On the other hand, in pH 7, HAA yields generally increased significantly with time, except for acrylamide during chlorination and acetoacetamide samples during both disinfection practices. This trend may be associated with the dominance and degradation rate difference of the HAA species between the two pHs and/or the simultaneous conversion of HAcAms to HAAs under the same conditions (Ding et al, 2018). Even though the last assumption may explain the HAAs increases with time in the chloraminated samples of pH 7, it cannot function as an explanation for the chlorinated ones where the corresponding HAcAms species presented resistance in degradation.…”

Section: Bromide Addition In Amide Precursorsmentioning

confidence: 97%

“…The differences are most likely due to the fivefold initial amide concentration and lower pH used in the earlier study (50 µM and pH 6, rather than 10 µM). The presence of chloroform in varying degrees was explained by two mechanisms (Reckhow et al, 1990): either as a hydrolysis product of tri-HAAs, favoured by base-catalysed hydrolysis of the halogenated leaving group (Ding et al, 2018), or as an independent by-product of amide oxidation via a currently unknown pathway.…”

Section: Formation Of Carbonaseous Disinfection By-products (Haas and Thms)mentioning

confidence: 99%

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The formation of disinfection by-products from the chlorination and chloramination of amides

et al. 2020

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This study examined the potential of six aliphatic and aromatic amides, commonly found in natural waters or used as chemical aids in water treatment, to act as organic precursors for nine haloacetamides (HAcAms), five haloacetonitriles (HANs), regulated trihalomethanes (THMs) and haloacetic acids (HAAs) upon chlorination and chloramination. The impact of key experimental conditions, representative of drinking water, including pH ( 7& 8), retention time (4 & 24 h) and bromide levels (0 & 100 µg/L), on the generation of the target DBPs was investigated. The highest aggregate DBP yields upon chlor(am)ination were reported for the the aromatic and hydrophobic hydroxybenzamide; 2.7% ±0.1% M/M (chlorination) and 1.7% M/M (chloramination). Increased reactivity was observed in aliphatic and hydrophilic compounds, acrylamide (2.5±0.2% M/M) and acetamide (1.3±0.2% M/M), in chlorination and chloramination, respectively. The addition of bromide increased average DBP yields by 50-70%. Relative to chlorination, the application of chloramines reduced DBP formation by 66.5%(without Br -) and by 46.4% (with Br -). However, bromine incorporation in HAAs and HAcAms was enhanced following chloramination, of concern due to the higher toxicological potency of brominated compounds.

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Section: Formation Of Nitrogenous Disinfection By-products (Hacams and Hans)supporting

confidence: 90%

Section: Formation Of Carbonaseous Disinfection By-products (Haas and Thms)mentioning

confidence: 97%

Section: Bromide Addition In Amide Precursorsmentioning

confidence: 97%

Section: Formation Of Carbonaseous Disinfection By-products (Haas and Thms)mentioning

confidence: 99%

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The formation of disinfection by-products from the chlorination and chloramination of amides

et al. 2020

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“…S1 ). Previous studies have reported that asparagine (Asn), which has an amide group, and the amide-based organic polymer polyacrylamide and its monomer acrylamide can produce haloacetamides (HAcAms) during chlorination and chloramination ( Ding et al., 2018a ; Huang et al., 2012 ). The cytotoxicity of HAcAms are 142 and 1.4 times higher than those of five regulated haloacetic acids and halonitromethanes, respectively ( Plewa et al., 2008 ).…”

Section: Introductionmentioning

confidence: 99%

Tetracycline antibiotics as precursors of dichloroacetamide and other disinfection byproducts during chlorination and chloramination

Shao

Huang

et al. 2021

Chemosphere

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Pollution of natural water and even source water with pharmaceuticals is problematic worldwide and raises concern about the possibility of disinfection byproduct (DBP) formation during subsequent water treatment. In this study, the formation of DBPs, especially dichloroacetamide (DCAcAm), was investigated during chlorination and chloramination of tetracyclines, which are a class of broad-spectrum antibiotics. DBPs including DCAcAm were formed during chlorination and chloramination of tetracycline (TC). Although the concentrations and theoretical cytotoxicity of the DBPs formed from TC were affected by the contact time, disinfectant dose, and pH, DCAcAm was the main contributor determining the yields and cytotoxicity of the measured DBPs. The DCAcAm yields from four tetracycline antibiotics ranged from 0.43% to 54.26% for chlorination. For chloramination, the DCAcAm yields reached 44.57%, and the nitrogen in DCAcAm mainly came from tetracycline antibiotics rather than chloramines. ClO 2 pre-oxidation and UV photolysis decreased DCAcAm formation during chlorination and chloramination of TC. The high yields observed in this study suggest that tetracycline antibiotics are possible precursors of DCAcAm.

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Cross‐Linked Double Network Graphene Oxide/Polymer Composites for Efficient Coagulation‐Flocculation

Lin

Li²,

Zhong

et al. 2019

Global Challenges

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Hybrid coagulant/flocculant consisting of nanomaterials have tremendous potential in solid‐liquid separation and can be applied to the coagulation‐flocculation‐sedimentation process of water treatment. In this work, inspired by the mineralization in nature, a graphene oxide/polymer‐based hybrid coagulant/flocculant that precipitates large‐scale, multicomponent (e.g., dyes, heavy metal ions, and nanoparticles) and complex pollutants simultaneously at room temperature by forming double‐network hydrogel through bioinspired Ca2+ crosslinking, is developed for the purification of wastewater. The coagulation‐flocculation‐sedimentation method developed here also provides a novel strategy for the preparation of macroscopic assemblies of multicomponents that can be applied to various application fields.

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Contribution of amide-based coagulant polyacrylamide as precursors of haloacetamides and other disinfection by-products

Cited by 35 publications

References 39 publications

The formation of disinfection by-products from the chlorination and chloramination of amides

The formation of disinfection by-products from the chlorination and chloramination of amides

Tetracycline antibiotics as precursors of dichloroacetamide and other disinfection byproducts during chlorination and chloramination

Cross‐Linked Double Network Graphene Oxide/Polymer Composites for Efficient Coagulation‐Flocculation

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