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Davis, Jack R.

doi:10.1023/a:1002961931613

Cited by 8 publications

(2 citation statements)

References 12 publications

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“…Even though previous studies have indicated that much of the nutrients entering urban watersheds originate from periodic stormwater runoff (precipitation) events, this nutrient source is not continuous as is the case with wastewater discharges. Reference [44] found that stormwater runoff was more important than WWTF's in explaining observed increases in contaminants, which can often be associated with these discharges [110] [111]. Reference [99] found that changes in resource quality may favor faster growing or shorter-lived species, and a negative relationship between diversity and nutrient concentrations.…”

Section: Discussionmentioning

confidence: 99%

Responses of Macroinvertebrate Community Metrics to a Wastewater Discharge in the Upper Blue River of Kansas and Missouri, USA

Poulton

Graham²,

Rasmussen³

et al. 2015

JWARP

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The Blue River Main wastewater treatment facility (WWTF) discharges into the upper Blue River (725 km 2), and is recently upgraded to implement biological nutrient removal. We measured biotic condition upstream and downstream of the discharge utilizing the macroinvertebrate protocol developed for Kansas streams. We examined responses of 34 metrics to determine the best indicators for discriminating site differences and for predicting biological condition. Significant differences between sites upstream and downstream of the discharge were identified for 15 metrics in April and 12 metrics in August. Upstream biotic condition scores were significantly greater than scores at both downstream sites in April (p = 0.02), and in August the most downstream site was classified as non-biologically supporting. Thirteen EPT taxa (Ephemeroptera, Plecoptera, Trichoptera) considered intolerant of degraded stream quality were absent at one or both downstream sites. Increases in tolerance metrics and filtering macroinvertebrates, and a decline in ratio of scrapers to filterers all indicated effects of increased nutrient enrichment. Stepwise regressions identified several significant models containing a suite of metrics with low redundancy (R 2 = 0.90-0.99). Based on the rapid decline in biological condition downstream of the discharge, the level of nutrient removal resulting from the facility upgrade (10%-20%) was not enough to mitigate negative effects on macroinvertebrate communities.

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Section: Discussionmentioning

confidence: 99%

Responses of Macroinvertebrate Community Metrics to a Wastewater Discharge in the Upper Blue River of Kansas and Missouri, USA

Poulton

Graham²,

Rasmussen³

et al. 2015

JWARP

View full text Add to dashboard Cite

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“…A key component of this exercise is the identification of contaminants of concern in the overflows and evaluation of their potential to adversely impact biota. Ammonia has been previously identified together with chlorine as the most important toxicants immediately downstream of effluent (treated sewage) discharges (Davis 1997 ). Environment Canada ( 2001 ) also noted that unionised ammonia was the most frequent cause of toxicity from wastewater effluent.…”

Section: Introductionmentioning

confidence: 99%

Tracking contaminants of concern in wet-weather sanitary sewer overflows

Besley

Batley

Cassidy

2023

Environ Sci Pollut Res

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Four representative sites in the greater city of Sydney, Australia, were selected for a study of the wet-weather overflow of sanitary (separate to stormwater) sewerage systems. Water samples were collected by autosamplers from up to eight wet weather overflow events over 16 months and from companion receiving water sites. The objective was to identify the risks posed by sewage contaminants to aquatic biota in the receiving waters, to aid in prioritising management actions. Twelve organic contaminants were identified in influents across the four sites under rainfall ingress diluted conditions, with measurements showing that the highest concentrations were restricted to the anti-inflammatory acetaminophen and the diabetes medication metformin. Lesser contaminants included theobromine, ibuprofen, sucralose, and three benzotriazoles (mainly 1-H benzotriazole). An assessment of the toxicity of the identified organic chemicals indicated that none appeared to pose concerns for ecosystem health before wet-weather ingress dilution, and this was even less likely after dilution in the receiving waters. Metal concentrations were low; however, ammonia concentrations in the influent did pose a risk to ecosystem health, although receiving water dilution diminished this risk at four of the five receiving water locations studied.

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Historical Changes in Fish Assemblage Composition Following Water Quality Improvement in the Mainstem Trinity River of Texas

Perkin

Bonner

2014

River Research & Apps

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The Clean Water Act of 1972 is credited with improving water quality across the USA, although few long‐term studies tracking hydrologic, chemical, and biological responses to cleanup efforts exist. The Trinity River of Texas was plagued by poor water quality for more than a century before passage of legislation to reduce point source pollution from the Dallas–Fort Worth (DFW) Metroplex. We tracked changes in components of flow regime; concentrations of ammonia, nitrate, phosphorus, and biochemical oxygen demand (BOD); and fish assemblage composition in three mainstem reaches during a 40‐year period (1968–2008) following implementation of a large‐scale cleanup initiative. Results suggest little change in flow regime components such as magnitude, timing, and rate of change among the three reaches during 1968–2008. Concentrations of water quality parameters declined through time and with greater distance from DFW, including the lowest concentrations in the reach downstream of a mainstem reservoir (Lake Livingston). Fish assemblage composition shifts correlated with attenuated nutrient and BOD concentrations, and species richness generally increased among all reaches. Native and intolerant fishes consistently increased through time among all three reaches, although lentic and non‐native species also increased downstream of Lake Livingston. Our findings suggest a revitalization of the Trinity River fish assemblage associated with reduced nutrient pollution in DFW (even among distant reaches) and also illustrate potential confounding factors such as stream impoundment and continued nutrient deposition that likely preclude complete recovery. Copyright © 2014 John Wiley & Sons, Ltd.

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Untitled

Cited by 8 publications

References 12 publications

Responses of Macroinvertebrate Community Metrics to a Wastewater Discharge in the Upper Blue River of Kansas and Missouri, USA

Responses of Macroinvertebrate Community Metrics to a Wastewater Discharge in the Upper Blue River of Kansas and Missouri, USA

Tracking contaminants of concern in wet-weather sanitary sewer overflows

Historical Changes in Fish Assemblage Composition Following Water Quality Improvement in the Mainstem Trinity River of Texas

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