Leakage of soluble microbial products from biological activated carbon filtration in drinking water treatment plants and its influence on health risks

Shen, Hong C.; Tang, Xianchun; Wu, Nanxiang; Chen, Hongbin

doi:10.1016/j.chemosphere.2018.03.123

Cited by 27 publications

(8 citation statements)

References 57 publications

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“…Earlier studies reported decreasing protein-like fluorescence through BAC filters, presumably due to microbial degradation, 31,42,43 although microbial degradation can also produce this signal. 29,44,45 In agreement with this inconsistent picture, we found no statistically significant effects of temperature on group 4 components. Warmer temperatures promote faster biological degradation 32,33 and would lead to increased removal and lowered C/C 0 for protein-like DOM.…”

Section: Dom Compositionsupporting

confidence: 85%

“…Fluorescence components similar to F 320 have also been identified in soluble microbial products produced during the microbial degradation of DOM. 29 Comparison with the OpenFluor database revealed that all identified fluorescence components were statistically congruent to published spectra in the database (Tucker congruence exceeding 0.95 for both excitation and emission spectrum). Matches across diverse aquatic environments were found, including when compared to samples from the Baltic sea (F 320 with C5 in Stedmon et al 30 In previous studies, visible fluorescence components similar to group 1, 2 and 3 have been reported to resist biodegradation and be adsorbed onto BAC material.…”

Section: Dom Compositionmentioning

confidence: 61%

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Temperature-dependent mechanisms of DOM removal by biological activated carbon filters

Moona

Wünsch

Bondelind

et al. 2019

Environ. Sci.: Water Res. Technol.

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Section: Dom Compositionsupporting

confidence: 85%

Section: Dom Compositionmentioning

confidence: 61%

Temperature-dependent mechanisms of DOM removal by biological activated carbon filters

Moona

Wünsch

Bondelind

et al. 2019

Environ. Sci.: Water Res. Technol.

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“…Since treatment processes can in uence the organic matter composition, e.g. leakage of soluble microbial products from biological activated carbon, only raw water sources were included (Hong et al, 2018). With all these criteria, 83 papers were selected, resulting in data collection from 396 water samples from all over the world with a high number of publications in the United States and Asia (Fig.…”

Section: Data Collectionmentioning

confidence: 99%

Identification of disinfection by-product precursors by natural organic matter fractionation: a review

et al. 2022

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During water disinfection, natural organic matter reacts with chlorinated reagents to produced harmful byproducts, yet the formation and nature of those byproducts are poorly known. Therefore, scientists have focused on the fractionation of natural organic matter with membranes or resins to better understand how and which organic matter fractions react during chlorination. Here we compared the reactivity of disinfection by-products for various organic fractions with a meta-analysis of data from 400 water samples published in 80 publications, with focus on chlorination time and dose, (SUVA 254 ) and the column capacity factor used during resin fractionation. SUVA 254 refer to speci c ultraviolet absorbance at 254 nm divided by the organic matter concentration. We found that hydrophobic compounds have 10-20% higher reactivity to both trihalomethane and haloacetic acid formation, compared to hydrophilic compounds in waters with high SUVA 254 above 2 L/(mg•m), while hydrophobic and hydrophilic compounds have equal reactivity in waters with low SUVA 254 . On the other hand, hydrophilic compounds are 20-80% more reactive towards emerging disinfection by-products, regardless of SUVA 254 .Chlorination time and dose does not in uence the reactivity ratio between the different fractions. An increase in column capacity factor can shift the reactivity ratio from hydrophobic to hydrophilic fractions. Dead-end, stirred cell ultra ltration membrane fractionation might not always produce sharply separated fractions, which is mainly due to fouling. Therefore, no clear correlation could be found between membrane fractions and all investigated disinfection by-product groups.

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“…Part of the DOC is biodegradable dissolved organic carbon (BDOC) that can serve as substrate for bacterial growth in the distribution network and may be responsible for undesirable color, taste or odor of drinking water. A widely used technology for DOC removal in drinking water treatment plants is ozonation followed by activated carbon filtration (Hong et al 2018; Korotta-Gamage and Sathasivan 2017a). The refractory fraction of DOC can be partially oxidized in the ozonation step, which greatly improves the biodegradability (von Gunten 2003).…”

Section: Introductionmentioning

confidence: 99%

Quantification of microbial degradation activities in biological activated carbon filters by reverse stable isotope labelling

et al. 2019

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Biological activated carbon (BAC) filters are frequently used in drinking water production for removing dissolved organic carbon (DOC) via adsorption of organic compounds and microbial degradation. However, proper methods are still missing to distinguish the two processes. Here, we introduce reverse stable isotope labelling (RIL) for assessing microbial activity in BAC filters. We incubated BAC samples from three different BAC filters (two granular activated carbon- and one extruded activated carbon-based) in a buffer amended with 13 C-labelled bicarbonate. By monitoring the release of 12 C–CO 2 from the mineralization of DOC, we could demonstrate the successful application of RIL in analysing microbial DOC degradation during drinking water treatment. Changing the water flow rates through BAC filters did not alter the microbial activities, even though apparent DOC removal efficiencies changed accordingly. Microbial DOC degradation activities quickly recovered from backwashing which was applied for removing particulate impurities and preventing clogging. The size distributions of activated carbon particles led to vertical stratification of microbial activities along the filter beds. Our results demonstrate that reverse isotope labelling is well suited to measure microbial DOC degradation on activated carbon particles, which provides a basis for improving operation and design of BAC filters.

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Leakage of soluble microbial products from biological activated carbon filtration in drinking water treatment plants and its influence on health risks

Cited by 27 publications

References 57 publications

Temperature-dependent mechanisms of DOM removal by biological activated carbon filters

Temperature-dependent mechanisms of DOM removal by biological activated carbon filters

Identification of disinfection by-product precursors by natural organic matter fractionation: a review

Quantification of microbial degradation activities in biological activated carbon filters by reverse stable isotope labelling

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