The Impact of Wastewater Treatment Effluent on the Biogeochemistry of the Enoree River, South Carolina, During Drought Conditions

Andersen, C. Brannon; Lewis, Gregory P.; Hart, M.J. 't; Pugh, John D.

doi:10.1007/s11270-014-1955-4

Cited by 4 publications

(4 citation statements)

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“…51 Available effluent DSi flux estimates from smaller wastewater treatment facilities that service 20 000−30 000 individuals (380−1500 kmol year −1 ) are proportionate to our DSi flux from DITP (2.2 million individuals serviced). 10,11 Future advancements in N reduction (e.g., biological aerated filters with submerged packed-bed reactors, biological aerated filters with fluidized-bed reactors, and moving-bed biofilm reactors) 29 in wastewater treatment should take care to maintain this observed minimum removal of DSi in an attempt to achieve ratios closer to ambient or Redfield ratios.…”

Section: ■ Discussionmentioning

confidence: 99%

“…Our estimate is within the range based on smaller treatment plants (12−76 mol SiO 2 person −1 ). 8,11 Scaling our estimate up to the entire population in the US serviced by wastewater treatment plants results in a national flux of 3.6 Gmol SiO 2 year −1 . Our wastewater flux estimate is ∼113%, ∼ 3%, and ∼5% of the Si load contributing to the Gulf of California (1027 × 10 3 km 2 , 3.2 Gmol SiO 2 year −1 ), Gulf of Mexico (4821 × 10 3 km 2 , 108 Gmol SiO 2 year −1 ), and Gulf of Saint Lawrence (1563 × 10 3 km 2 , 77 Gmol SiO 2 year −1 ), respectively.…”

Section: ■ Discussionmentioning

confidence: 99%

“…Wastewater treatment effluent has long been recognized as a source of human waste and detergent derived N and P to coastal environments . However, few studies have connected estimates of the Si load in raw sewage, the load discharged by municipal wastewater effluent, and patterns of Si availability in the receiving water. − Modern municipal wastewater plants were not designed to remove Si, however settling tanks, the use of flocculants, sludge separation, and bioreactors all could reduce dissolved silica (DSi, H 4 SiO 4 ) concentrations. Conversely, high temperatures and mechanical agitation may dissolve particulate forms of silica within the wastewater treatment plant and increase the DSi in the effluent relative to influent.…”

Section: Introductionmentioning

confidence: 99%

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Fate and Effect of Dissolved Silicon within Wastewater Treatment Effluent

Maguire

Fulweiler

2017

Environ. Sci. Technol.

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In large rivers, the ratios of silicon (Si)/nitrogen (N)/phosphorus (P) have changed dramatically as anthropogenic additions of N or P are not matched by Si. Wastewater effluent is a recognized source of N and P to coastal environments. Few previous studies, however, have examined the Si load of a large wastewater plant's effluent or the molar ratios of Si/N and Si/P in effluent. We examine the annual flux of dissolved silicon (DSi) carried by effluent from the second largest treatment plant by flow in the United States (Deer Island Treatment Plant, DITP, Boston, MA). We compare treatment plant nutrient fluxes to local urban river nutrient fluxes and trace the impact of the DITP DSi loading on receiving waters. Estimates (±95% confidence interval) of treated effluent (67 800 ± 1500 kmol DSi year) compared to untreated (69 500 kmol DSi year) indicate that the process of sewage treatment at DITP likely does not remove DSi. DITP effluent was Si-limited and this Si-limitation is reflected in the receiving waters (Massachusetts Bay). However, Si-limitation appears only in the area immediately surrounding the effluent discharge. We use these results to explain phytoplankton patterns in Massachusetts Bay and to provide the first estimate of DSi loading (3.6 Gmol SiO year) from wastewater effluent across the US.

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Section: ■ Discussionmentioning

confidence: 99%

Section: ■ Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fate and Effect of Dissolved Silicon within Wastewater Treatment Effluent

Maguire

Fulweiler

2017

Environ. Sci. Technol.

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“…Ranges for the compounds whose concentration differs between influent/effluent and non-digested sludgeAndersen et al (2014),Kumar et al (2018),Wilfert et al (2016),Henze et al (2008) andBarajas et al (2002) …”

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confidence: 99%

Ionic strength of the liquid phase of different sludge streams in a wastewater treatment plant

Prot

Korving²,

Loosdrecht

2022

Water Science and Technology

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In a wastewater treatment plant (WWTP), several sludge streams exist and the composition of their liquid phase varies with time and place. For evaluating the potential for formation of precipitates and equilibria for weak acids/bases the ionic strength and chemical composition needs to be known. This information is often not available in literature, and even neglected in chemical model-based research. Based on a literature review, we proposed 3 ranges of concentration (low, typical and high) for the major constituents of the liquid phase of the different streams in a WWTP. The study also discusses the reasons for the concentration evolution, and the exceptional cases, to allow readers to consider the right range depending on their situation. The ionic strength of the different streams and the contribution of its constituents was calculated based on the ionic composition. The major contributors to the ionic strength for the wastewater-based streams (influent, effluent and mixed sludge) were Na+, Cl−, Mg2+ and Ca2+ representing 50–70% of the ionic strength. For digestate, and accounted for 65–75% of the ionic strength. Even though the ionic strength is recognised to impact several important wastewater treatment processes, its utilization in literature is not always adequate, which is discussed in this study.

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