Evaluation of drinking water treatment combined filter backwash water recycling technology based on comet and micronucleus assay

Chen, Ting; Ya-tong, XU; Liu, Zhiquan; Zhu, Shijun; Shi, Wenxin; Cui, Fuyi

doi:10.1016/j.jes.2015.05.020

Cited by 11 publications

(2 citation statements)

References 28 publications

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“…In available literature investigating genotoxicity of finished drinking water samples, conflicting results have been reported. For instance, some studies investigating the genotoxicity in drinking water samples observed decreases in micronuclei inductions following various conventional water treatment methods similar to those employed at Görvälnverket [37,52]. Several other studies using different established cell lines reported no significant differences in the frequency of micronucleus events between control samples and samples representing conventional treatment methods (e.g., pre-disinfection with chlorine dioxide, coagulation, sand-and GAC-filtration, post-chlorination), therefore suggesting no treatment effects [29,[53][54][55].…”

Section: Discussion On Full-scale Treatment Technologiesmentioning

confidence: 99%

Towards improved drinking water safety: the use of in vitro bioassays to optimize treatment processes and assess chemical hazards

2023

Acta Universitatis Agriculturae Sueciae

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Drinking water safety has been primarily dependent on the monitoring of only a limited number of individual chemicals via chemical analysis, which is insufficient to characterize the myriad of hazardous chemicals present in water. Effect-based methods (EBMs) using in vitro bioassays are useful in that they evaluate biological effects from all the known and unknown chemicals in the water and draw on toxicological principles. This thesis aimed to explore the versatility of EBMs for different applications related to drinking water safety. Firstly, we demonstrated how EBMs can be used to compare pilot-scale vs. full-scale treatment processes at a large-scale municipal drinking water treatment plant (DWTP). More importantly, a potentially serious health-relevant effect, genotoxicity, was detected in the raw water as well as finished drinking water from this DWTP. Next, we evaluated the process of artificial infiltration as a treatment method at another municipal drinking water production system. This was in consideration of the fact that water sourced from this type of purification method is prone to contamination with chemical hazards. In addition to these two field studies, we assessed the impact of sample acidification and extract storage time on the outcomes of certain in vitro bioassays, which has been largely under-emphasized when designing sampling strategies for studies using EBMs. For this we collected samples from a wastewater treatment plant that had future water reuse plans for irrigation and potentially as a drinking water source. Our findings revealed that sample acidification did have impacts depending on the selected bioassay(s) and treatment process. Bioactivities in the sample extracts also did not remain unchanged following storage for approximately one year. In the final study, we used EBMs to evaluate two common mycotoxins and their derivatives in the presence of an exogenous metabolic activation system. We chose to study mycotoxins given that their occurrence in surface and drinking waters has been receiving increasing attention. Our findings highlighted that the inclusion of exogenous metabolic activation is useful for detecting the biological effects of mycotoxin metabolites in in vitro bioassays.

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Section: Discussion On Full-scale Treatment Technologiesmentioning

confidence: 99%

Towards improved drinking water safety: the use of in vitro bioassays to optimize treatment processes and assess chemical hazards

2023

Acta Universitatis Agriculturae Sueciae

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“…However, another study found that recycled water from filter backwash contains lower levels of UV254 and DOC concentrations, but higher turbidity and aluminum concentrations than raw water [11]. The recycling process of water treatment improves the coagulation efficiency, including organic material removal [12]. Furthermore, the contribution of the distribution pipe wall to the reduction in residual chlorine was considered small owing to the large diameters of the pipes.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of dissolved organic matter in a water purification plant and distribution pipes

et al. 2019

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Dissolved organic matter (DOM) needs to be characterized todetermine the ability of a water treatment unit to reduce organic matter andits relationship to the levels of chlorine required for disinfection. Weinvestigated water quality parameters, including DOM, in a waterpurification plant and distribution pipes located in central Japan. Thedissolved organic carbon (DOC) concentration decreased from 0.73 mg/Lin raw water to 0.50 mg/L in purified water by conventional treatmentprocesses. The DOC of purified water decreased slightly in the pipesdownstream of the plant. The three-dimensional excitation-emission matrixfluorescence spectra showed some specific peaks for humic-like substancesand protein-like substances in all water samples, and the compositions ofDOM in purified water were close to those in raw water. However, therewas a peak of protein-like substances in purified and returned water, whichwas not observed for raw water. The fluorescence intensities of humic-likesubstances in purified water decreased downstream of the plant, while thefluorescence intensities of protein-like substances increased in the pipes. The measured molecular weight distributions of DOM in water presentedsome specific peaks, and DOM with a smaller molecular weight was noteasily removed by water treatment processes. There were positiverelationships between decreases in the intensities of some peaks andresidual chlorine decay.

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Comparative genotoxicity of water processed by three drinking water treatment plants with different water treatment procedures

Zhang

Liu

Zhang

et al. 2020

Front. Environ. Sci. Eng.

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Evaluation of drinking water treatment combined filter backwash water recycling technology based on comet and micronucleus assay

Cited by 11 publications

References 28 publications

Towards improved drinking water safety: the use of in vitro bioassays to optimize treatment processes and assess chemical hazards

Towards improved drinking water safety: the use of in vitro bioassays to optimize treatment processes and assess chemical hazards

Characteristics of dissolved organic matter in a water purification plant and distribution pipes

Comparative genotoxicity of water processed by three drinking water treatment plants with different water treatment procedures

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