Oxidation of 51 micropollutants during drinking water ozonation: Formation of transformation products and their fate during biological post-filtration

Gulde, Rebekka; Clerc, Baptiste; Rutsch, Moreno; Helbing, Jakob; Salhi, Elisabeth; McArdell, Christa S.; Gunten, Urs von

doi:10.1016/j.watres.2021.117812

Cited by 45 publications

(25 citation statements)

References 115 publications

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“…Various parameters can affect removal efficiency, such as adsorption kinetics, adsorbate concentration, and water composition. Oxidation of micropollutants with strong chemical oxidants (e.g., ozone) and advanced oxidation processes (e.g., UV-H 2 O 2 ) is also possible [67,68]. Nevertheless, the applications of such technologies may end up being the cause of byproducts that may be more toxic or estrogenic than the primary compounds (e.g., atrazine and deethylatrazine).…”

Section: Applications Of Mips In Water and Wastewater Treatmentmentioning

confidence: 99%

Arsenic(III) and Arsenic(V) Removal from Water Sources by Molecularly Imprinted Polymers (MIPs): A Mini Review of Recent Developments

2022

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The present review article summarizes the recent findings reported in the literature with regard to the use of molecularly imprinted polymers for the removal of arsenic from water and wastewater. MIPs are polymers in which a template is employed in order to enable the formation of recognition sites during the covalent assembly of the bulk phase, via a polymerization or polycondensation process. The efficiency of both arsenic species and the mechanism of removal are highlighted. The results have shown that under certain conditions, MIPs demonstrated arsenic sorption capacities of up to 130 mg/g for As(V) and 151 mg/g for As(III), while the regeneration ability was found to reach up to more than 20 cycles. The overall results showed that further development of MIPs could result in the formation of promising adsorbents for arsenic removal from waters. The use of MIPs for the removal not only of arsenic but also other inorganic contaminants is considered a very important topic, with great potential in terms of future applications in water treatment. The main advantage of these materials is that they are very selective toward the contaminant of interest. This enhanced selectivity is attributed to the incorporation of specific templates, which can then adsorb the contaminant of interest almost exclusively. Therefore, the main problem in adsorption processes is the competition for adsorption sites by other water components, for example, phosphates, nitrates, carbonates, and sulfates, which can be circumvented by the use of MI-type adsorbents.

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Section: Applications Of Mips In Water and Wastewater Treatmentmentioning

confidence: 99%

Arsenic(III) and Arsenic(V) Removal from Water Sources by Molecularly Imprinted Polymers (MIPs): A Mini Review of Recent Developments

2022

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“…The reaction of ozone with dissolved organic matter leads to the formation of numerous small oxygen-rich molecules (such as carboxylic acids, aldehydes, or ketones) commonly referred to as assimilable organic carbon (AOC) or biodegradable organic carbon (BDOC). As the presence of these easily biodegradable compounds in the water can promote the regrowth of microorganisms in the distribution system, their removal is necessary and is commonly achieved by implementing biological post-treatments after oxidation [44,80], such as filtration with activated carbon or biological sand filtration.…”

Section: Reactivity During Other Treatment Stepsmentioning

confidence: 99%

“…A comprehensive study on the fate of ozonation TPs during biologically active sand filtration has recently been published by Gulde et al [80]. The authors investigated the oxidation of 51 micropollutants during ozonation.…”

Section: • Sand Filtrationmentioning

confidence: 99%

Proposal for a tiered approach to evaluate the risk of transformation products formed from pesticide residues during drinking water treatment

Michel¹,

Armbruster

Benz-Birck³

et al. 2022

Environ Sci Eur

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Oxidative treatment methods are valuable tools for the microbial safety of drinking water. However, the reaction of oxidants with natural substances or anthropogenic contaminants present in the raw water can potentially lead to the formation of harmful transformation products (TPs). The present paper proposes a tiered approach for the risk evaluation of TPs formed from pesticide residues during drinking water treatment. First, the concentrations of pesticide residues in raw water used for drinking water production are evaluated (step 1). Substances with a predicted concentration in raw water above 0.1 µg/L proceed further to a reactivity assessment, examining the behavior in water treatment plants (step 2). Using information available in the scientific literature, prediction of structural elements in the TPs can be made and allow a worst-case assessment based on the Threshold of Toxicological Concern (TTC) (step 3). If concerns remain, experiments may be conducted to simulate water treatment (step 4). Because of their complexity and variability, experiments for the simulation of water treatment should focus on prioritized substances of potential concern. The test conditions should be realistic (i.e., close to EU-representative conditions in waterworks) and ozonation and chlorination should be combined with pre- and post-treatment steps, as is normally the case in European waterworks. As a first screening option, we propose to test the toxicity of the reaction mixture. If the treated water shows an enhanced toxicity, further experiments can be conducted to identify and quantify the major TPs (step 5). We propose to define major TPs as substances present at more than 10% of the initially applied test substance. For major TPs, a tiered dietary risk assessment is conducted, starting with the TTC concept, and continuing with toxicity testing of the TP, according to EFSA and ECHA and internationally agreed guidance.

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“…A comprehensive study on the fate of ozonation TPs during biologically active sand ltration has recently been published by Gulde et al (2021) [80]. The authors investigated the oxidation of 51 micropollutants during ozonation.…”

Section: Sand Filtrationmentioning

confidence: 99%

Proposal for a tiered approach to evaluate the risk of transformation products formed from pesticides residues during drinking water treatment

Michel

Armbruster²,

Benz-Birck³

et al. 2022

Preprint

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Oxidative treatment methods are valuable tools for the microbial safety of drinking water. However, the reaction of oxidants with natural substances or anthropogenic contaminants present in the raw water can potentially lead to the formation of harmful transformation products (TPs). The present paper proposes a tiered approach for the risk evaluation of TPs formed from pesticides residues during drinking water treatment. First, the concentrations of pesticides residues in raw water used for drinking water production are evaluated (step 1). Substances with a predicted concentration in raw water above 0.1 µg/L proceed further to a reactivity assessment, examining the behaviour in water treatment plants (step 2). Using information available in the scientific literature, prediction of structural elements in the TPs can be made and allow a worst-case assessment based on the Threshold of Toxicological Concern (TTC) (step 3). If concerns remain, experiments may be conducted to simulate water treatment (step 4). Because of their complexity and variability, experiments for the simulation of water treatment should focus on prioritized substances of potential concern. The test conditions should be realistic (i.e., close to EU-representative conditions in waterworks) and ozonation and chlorination should be combined with pre- and post-treatment steps, as is normally the case in European waterworks. As a first screening option, we propose to test the toxicity of the reaction mixture. If the treated water shows an enhanced toxicity, further experiments can be conducted to identify and quantify the major TPs (step 5). We propose to define major TPs as substances present at more than 10% of the initially applied test substance. For major TPs a tiered dietary risk assessment is conducted, starting with the TTC concept, and continuing with toxicity testing of the TP, according to EFSA and ECHA and internationally agreed guidance.

show abstract

Oxidation of 51 micropollutants during drinking water ozonation: Formation of transformation products and their fate during biological post-filtration

Cited by 45 publications

References 115 publications

Arsenic(III) and Arsenic(V) Removal from Water Sources by Molecularly Imprinted Polymers (MIPs): A Mini Review of Recent Developments

Arsenic(III) and Arsenic(V) Removal from Water Sources by Molecularly Imprinted Polymers (MIPs): A Mini Review of Recent Developments

Proposal for a tiered approach to evaluate the risk of transformation products formed from pesticide residues during drinking water treatment

Proposal for a tiered approach to evaluate the risk of transformation products formed from pesticides residues during drinking water treatment

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