The impact of rainstorm events on coagulation and clarifier performance in potable water treatment

Hurst, A.

doi:10.1016/s0048-9697(03)00491-1

Cited by 12 publications

(19 citation statements)

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“…These conditions usually coincide with an increase in the organic concentration of the raw water that can arise from a number of potential causes dependent upon geographical location. In temperate regions, the first rainfalls after dry periods flush accumulated carbon from soils into water bodies (3)(4)(5). In mountainous areas, snowmelts in spring can increase carbon concentrations in raw water, as snow is a significant sink of organic material from adsorption of atmospheric organics (6).…”

Section: Introductionmentioning

confidence: 99%

How the Natural Organic Matter to Coagulant Ratio Impacts on Floc Structural Properties

Jarvis

Jefferson

Parsons

2005

Environ. Sci. Technol.

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Periods of elevated natural organic matter (NOM) loadings at water treatment works (WTW) can lead to operational problems as a result of deterioration in floc structural quality. This study used a range of diagnostic tools to evaluate floc structure with increasing organic fraction in the floc. It was observed that when the organic fraction in the floc went significantly over a mass ratio of 1 mg of DOC to 1 mg of Fe (coagulant), the floc size, settling velocity, fractal dimension, and strength were seen to decrease even when the NOM removed during coagulation remained high. A model was proposed to explain these changes that was dependent upon the adsorption of NOM on primary particle surfaces. The operational significance of these results suggests that for the coagulant under investigation the correct coagulant dose must be applied to give good floc structure.

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Section: Introductionmentioning

confidence: 99%

How the Natural Organic Matter to Coagulant Ratio Impacts on Floc Structural Properties

Jarvis

Jefferson

Parsons

2005

Environ. Sci. Technol.

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“…Concentrations of DOM must be reduced using water treatment processes such as coagulation to improve water taste and odor and to minimize the formation of disinfection by‐products (DBPs), such as trihalomethanes (THMs), haloacetic acids (HAAs), and haloacetonitriles, which may be harmful to human health (Krasner et al, 2006). Storm events can have adverse impacts on drinking water quality as they can produce rapid increases in sediment, organic matter, turbidity, and pathogens and can decrease clarifier performance (Curriero et al, 2001; Hurst et al, 2004). Furthermore, increases in organic matter in raw waters have a negative effect on coagulant and chlorine demand, resulting in elevated treatment costs (Matilainen and Sillanpää, 2010).…”

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confidence: 99%

Heavy Rainfall Impacts on Trihalomethane Formation in Contrasting Northwestern European Potable Waters

et al. 2015

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There is emerging concern over the impact of extreme events such as heavy rainfall on the quality of water entering the drinking water supply from aboveground sources, as such events are expected to increase in magnitude and frequency in response to climate change. We compared the impact of rainfall events on streamwater quality in four contrasting upland (peatland and mineral soil) and lowland agricultural catchments used to supply drinking water in France (Brittany) and the United Kingdom (North Wales) by analyzing water samples collected before, during, and after specific events. At all four streams, heavy rainfall led to a considerable rise in organic matter concentration ranging from 48 to 158%. Dissolved organic carbon (DOC) quality, as determined using specific ultraviolet absorbance, changed consistently at all sites during rainfall events, with a greater proportion of aromatic and higher molecular weight compounds following the onset of rainfall. However, the change in DOC quality and quantity did not significantly alter the trihalomethane formation potential. We observed small increases in trihalomethane (THM) generation only at the Welsh peatland and agricultural sites and a small decrease at the Brittany agricultural site. The proportion of brominated THMs in chlorinated waters was positively correlated with bromide/DOC ratio in raw waters for all sites and hydrological conditions. These results provide a first indication of the potential implications for surface-based drinking water resources resulting from expected future increases in rainfall event intensity and extension of dry periods with climate changes.

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“…Hurst et al . () support the use of TRI as a simple and usable means of identifying and quantifying unstable periods. It can simplify large data sets to a manageable level.…”

Section: Background To Measuring Stabilitymentioning

confidence: 76%

Assessing filter robustness at drinking water treatment plants

Hartshorn

Prpich

Upton

et al. 2014

Water & Environment J

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This investigation explores the use of five‐parameter logistic curve fitting in quantifying turbidity robustness and risk scoring in clarification and filtrations stages of several surface water treatment works in the Anglian Water region of the United Kingdom. The approach taken reviews different scoring systems and addresses issues of weighting, averages and variability in robustness performance using turbidity robustness indices (TRIs). It also proposes an area‐based risk scoring profile to assess performance [relative area profile for T90 (RAP90)]. The metrics produced are considered to be a logical and rational way to help prioritise where resources for water treatment operation should be deployed.

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The impact of rainstorm events on coagulation and clarifier performance in potable water treatment

Cited by 12 publications

References 0 publications

How the Natural Organic Matter to Coagulant Ratio Impacts on Floc Structural Properties

How the Natural Organic Matter to Coagulant Ratio Impacts on Floc Structural Properties

Heavy Rainfall Impacts on Trihalomethane Formation in Contrasting Northwestern European Potable Waters

Assessing filter robustness at drinking water treatment plants

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