Linking the mobilization of dissolved organic matter in catchments and its removal in drinking water treatment to its molecular characteristics

Raeke, Julia; Lechtenfeld, Oliver J.; Tittel, Jörg; Oosterwoud, Marieke; Bornmann, Katrin; Reemtsma, Thorsten

doi:10.1016/j.watres.2017.01.066

Cited by 46 publications

(46 citation statements)

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“…In contrast to our findings, Raeke et al (2017) found higher-molecular-weight molecules at elevated discharge in three temperate catchments (including the one studied here). However, they used grab samples from different hydroclimatic situations and streams, thus potentially masking the event-scale dynamics of DOC mobilization as revealed in the current study.…”

Section: Warm and Dry Situationscontrasting

confidence: 99%

“…Differences in DOC quality observed during varying runoff conditions have been used to characterize source zone activation in smaller watersheds (Hood et al, 2006;Sanderman et al, 2009). Hence, the combination of high-frequency C DOC measurements with additional spectral and analytical methods to characterize DOC quality (Herzsprung et al, 2012;Raeke et al, 2017;Roth et al, 2013) at temporal resolutions capable of capturing the dynamics within hydrologic events provides an opportunity to significantly improve our mechanistic understanding of DOC mobilization, transport, and ultimately export from catchments (Berggren and del Giorgio, 2015;Creed et al, 2015;Köhler et al, 2009;Strohmeier et al, 2013). jointly evaluated DOC concentration and quality dynamics, but they were limited to hourly event data and data once every 2 weeks between events.…”

Section: Introductionmentioning

confidence: 99%

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High-frequency measurements explain quantity and quality of dissolved organic carbon mobilization in a headwater catchment

et al. 2019

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Abstract. Increasing dissolved organic carbon (DOC) concentrations and exports from headwater catchments impact the quality of downstream waters and pose challenges to water supply. The importance of riparian zones for DOC export from catchments in humid, temperate climates has generally been acknowledged, but the hydrological controls and biogeochemical factors that govern mobilization of DOC from riparian zones remain elusive. A high-frequency dataset (15 min resolution for over 1 year) from a headwater catchment in the Harz Mountains (Germany) was analyzed for dominant patterns in DOC concentration (CDOC) and optical DOC quality parameters SUVA254 and S275−295 (spectral slope between 275 and 295 nm) on event and seasonal scales. Quality parameters and CDOC systematically changed with increasing fractions of high-frequency quick flow (Qhf) and antecedent hydroclimatic conditions, defined by the following metrics: aridity index (AI60) of the preceding 60 d and the quotient of mean temperature (T30) and mean discharge (Q30) of the preceding 30 d, which we refer to as discharge-normalized temperature (DNT30). Selected statistical multiple linear regression models for the complete time series (R2=0.72, 0.64 and 0.65 for CDOC, SUVA254 and S275−295, resp.) captured DOC dynamics based on event (Qhf and baseflow) and seasonal-scale predictors (AI60, DNT30). The relative importance of seasonal-scale predictors allowed for the separation of three hydroclimatic states (warm and dry, cold and wet, and intermediate). The specific DOC quality for each state indicates a shift in the activated source zones and highlights the importance of antecedent conditions and their impact on DOC accumulation and mobilization in the riparian zone. The warm and dry state results in high DOC concentrations during events and low concentrations between events and thus can be seen as mobilization limited, whereas the cold and wet state results in low concentration between and during events due to limited DOC accumulation in the riparian zone. The study demonstrates the considerable value of continuous high-frequency measurements of DOC quality and quantity and its (hydroclimatic) key controlling variables in quantitatively unraveling DOC mobilization in the riparian zone. These variables can be linked to DOC source activation by discharge events and the more seasonal control of DOC production in riparian soils.

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Section: Warm and Dry Situationscontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-frequency measurements explain quantity and quality of dissolved organic carbon mobilization in a headwater catchment

et al. 2019

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“…Low S 275-295 values indicate high molecular weight of DOC with a dominance of terrestrial waters (Helms et al, 2008;Spencer et al, 2012) entering the stream during that time. In contrast, Raeke et al (2017) found higher molecular weight molecules at elevated discharge in three temperate catchments (including the one studied here).…”

Section: ) Warm and Dry Situationscontrasting

confidence: 75%

“…Although individual storms play a crucial role in DOC exports, most studies to date have only focused on temporally aggregated data (Köhler et al, 2008) and the seasonal time scale with little or no consideration of the event-scale variability of DOC quantity and quality. Recent years have seen significant advances in sensing technologies for high-frequency in situ concentration measurements Strohmeier et al, 2013) as well as spectral and analytical methods to characterize DOC composition (Herzsprung et al, 2012;Raeke et al, 2017;Roth et al, 2013). Combining information on DOC quantity and quality at temporal resolutions capable of capturing the dynamics within hydrologic events provides an opportunity to significantly improve our mechanistic understanding of DOC mobilization, transport, and ultimately export from catchments (Berggren and del Giorgio, 2015;Creed et al, 2015;Köhler et al, 2009;Strohmeier et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

High-frequency measurements of dissolved organic carbon quantity and quality in a headwater catchment

Werner

Musolff

Lechtenfeld

et al. 2019

Preprint

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Abstract. Increasing dissolved organic carbon (DOC) exports from headwater catchments impact the quality of downstream waters and pose challenges to water supply. The importance of riparian zones for DOC export from catchments in humid, temperate climates has generally been acknowledged, but the hydrological controls and biogeochemical factors that govern mobilization of DOC from riparian zones remain elusive. A one-year high-frequency (15 minutes) dataset from a headwater catchment in the Harz Mountains (Germany) was analyzed for dominant patterns in DOC concentration (CDOC) and optical DOC quality parameters SUVA254 and S275-295 (spectral slope between 275&#8201;nm and 295&#8201;nm) on event and seasonal scale. Quality parameters and CDOC systematically changed with increasing fractions of high-frequency quick flow (Qhf) and antecedent hydroclimatic conditions, defined by the following metrics: Aridity Index (AI60) of the preceding 60 days, mean temperature (T30) and discharge (Q30) of the preceding 30 days and the quotient T30/Q30 which we refer to as discharge-normalized temperature (DNT30). Selected statistical regression models for the complete time series (R&#178;&#8201;=&#8201;0.72, 0.64 and 0.65 for CDOC, SUVA254 and S275-295, resp.) captured DOC dynamics based on event (Qhf and baseflow) and seasonal-scale predictors (AI60, DNT30). The relative importance of seasonal-scale predictors allowed for the separation of three hydroclimatic states (warm & dry, cold & wet and intermediate). The specific DOC quality for each state indicates a shift in the activated source zones and highlights the importance of antecedent conditions and its impact on DOC accumulation and mobilization in the riparian zone. The warm & dry state results in high DOC concentrations during events and low concentrations between events and thus can be seen as mobilization limited, whereas the cold & wet state results in low concentration between and during events due to limited DOC accumulation in the riparian zone. We conclude that the high concentration variability of DOC in the stream can be explained by only a few controlling variables. These variables can be linked to DOC source activation by discharge events and the more seasonal control of DOC production in riparian soils.

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“…Organic content in the sludge wasted from ESZ-WTP recorded 23% w/w of the sludge, which reflects organic matter removed from the raw water during the treatment process. This complies with the literature which reports the presence of organic matter in sludge wasted from the clarification process (Fouad et al, 2017a(Fouad et al, , 2017cRaeke et al, 2017). Metals content of the sludge used in this study is presented in Table 1, which illustrates that aluminum was the highest concentration metal in the sludge.…”

Section: Resultssupporting

confidence: 89%

Repeated Aluminum Sulfate Recovery from Waterworks Sludge: A Case Study in El‐Sheikh Zaid WTP

Fouad¹,

Razek

El-Gendy

2018

Water Environment Research

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Although surface water treatment presents a good solution for pollutants in rivers and freshwater lakes, the purification process itself presents a great threat to the aquatic environment through aluminum waste disposal. Recent studies have introduced coagulants recovery from treatment sludge as a green solution for waste handling and cost reduction. This article aims to evaluate repeated aluminum coagulants recovery from sludge using sulfuric acid. The waste from El-Sheikh Zaid Water Treatment Plant (ESZ-WTP) was characterized, then sequential coagulants recovery using optimum conditions was conducted. In addition, treated water was analyzed to determine the efficiency of the obtained coagulants and their influence on treated water quality. Sequential coagulants recovery using acidification revealed that no metals accumulation took place in the produced coagulants until the third recovery from ESZ-WTP sludge. On the other hand, a noticeable increase in trihalomethanes was detected in the treated water, especially using the third recovered coagulant. In conclusion, sequential coagulants recovery and usage in water treatment is an attractive alternative for single-use original coagulant in ESZ-WTP but for no more than three sequential recoveries. It is advisable to apply a fresh coagulant every three sequential recoveries to enrich the aluminum content and regenerate the sludge before restarting the recovery process. Water Environ. Res., 90, 2030Res., 90, (2018.

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Linking the mobilization of dissolved organic matter in catchments and its removal in drinking water treatment to its molecular characteristics

Cited by 46 publications

References 58 publications

High-frequency measurements explain quantity and quality of dissolved organic carbon mobilization in a headwater catchment

High-frequency measurements explain quantity and quality of dissolved organic carbon mobilization in a headwater catchment

High-frequency measurements of dissolved organic carbon quantity and quality in a headwater catchment

Repeated Aluminum Sulfate Recovery from Waterworks Sludge: A Case Study in El‐Sheikh Zaid WTP

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