scholarly journals Response of Lower Sacramento River phytoplankton to high-ammonium wastewater effluent

Elem Sci Anth ◽  
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Aaron L. Strong ◽  
Matthew M. Mills ◽  
Ivy B. Huang ◽  
Gert L. van Dijken ◽  
Sara E. Driscoll ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Primary Production ◽  
San Francisco ◽  
Growth Rates ◽  
Wastewater Treatment Plant ◽  
Inorganic Nitrogen ◽  
Treatment Plant ◽  
Wastewater Effluent ◽  
Dissolved Inorganic Nitrogen ◽  
Wastewater Treatment Plant Effluent

Since the 1980s, the San Francisco Bay Delta ecosystem has experienced large declines in primary production. Hypothesized reasons for this decline include (1) suppression of nitrate (NO3−) uptake, and thus phytoplankton growth, due to high concentrations of ammonium (NH4+), and (2) wastewater NH4+-induced changes in phytoplankton community composition away from large-celled diatoms. These twin hypotheses implicate NH4+ loading from the Sacramento Regional Wastewater Treatment Plant effluent outfall in explaining declines in primary production in the region. They have been controversial within the water resources management community and have stimulated a lengthy public scientific and regulatory debate. Here, in an effort to resolve this debate, we present results from a 48-h incubation experiment with surface water from both upstream and downstream of the Sacramento Regional Wastewater Treatment Plant effluent outfall, a major source of NH4+ loading to the ecosystem. We amended this water with either NH4+, NO3−, or full wastewater effluent. All assays were incubated under high light (52% of incident irradiance) or low light (6% of incident irradiance). NO3− uptake rates were suppressed to near zero in all treatments with either added NH4+, added wastewater effluent, or high in situ NH4+ concentrations. Yet, phytoplankton uniformly grew well on all dissolved inorganic nitrogen sources, including effluent and NH4+. Diatom species were the most abundant taxa at all stations, and diatom cell abundances increased at greater rates than all other taxa over the course of the experiment. Among all treatments, the light treatment had the greatest effects on chlorophyll a accumulation and phytoplankton growth rates. Our results suggest that high NH4+ loading is not a driver of the lower productivity in the San Francisco Bay Delta. Although phytoplankton preferred NH4+ to NO3− when both were available in our experiment, the form of dissolved inorganic nitrogen had no effect on growth rates or species composition.

scholarly journals Intra- and Inter-Annual Variability in the Dissolved Inorganic Nitrogen in an Urbanized River before and after Wastewater Treatment Plant Upgrades: Case Study in the Grand River (Southwestern Ontario)

Nitrogen ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 139-154
Author(s):  
Eduardo Cejudo ◽  
Madeline S. Rosamond ◽  
Richard J. Elgood ◽  
Sherry L. Schiff
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
River Discharge ◽  
Inorganic Nitrogen ◽  
Treatment Plant ◽  
Ammonium Concentration ◽  
Dissolved Inorganic Nitrogen ◽  
Annual Variability ◽  
Assimilation Capacity

External nitrogen (N) inputs originating from human activities act as essential nutrients accumulation in aquatic ecosystems or it is exported elsewhere, where the assimilation capacity is surpassed. This research presents a multi-annual case study of the dissolved inorganic nitrogen (DIN) in an urban river in Ontario (Canada), assessed changes in N downstream of the largest wastewater treatment plant (WTP) in the watershed. Changes in the DIN effluent discharge, in-river concentrations and loads were observed comparing the intra- and inter-annual variability (2010–2013) before, during and after WTP upgrades. These upgrades reduced the ammonium concentration in the river from 0.44 to 0.11 mg N-NH4+/L (year average), but the N load in the effluent increased. In the river, nitrate and ammonium concentrations responded to seasonal variability, being higher during the low temperature (>10 °C) and high flow seasons (spring and spring melt). Among years, changes in the DIN concentration are likely controlled by the effluent to river dilution ratio, which variability resides on the differences in river discharge between years. This suggest that the increasing trend in the DIN concentration and loads are the result of agricultural and urban additions, together with reduced N assimilation, in addition to N loads responding to variable river discharge. Finally, we propose monitoring both concentrations and loads, as they provide answers to different questions for regulatory agencies and water managers, allowing tailored strategies for different purposes, objectives and users.

scholarly journals Persulfate mediated solar photo-Fenton aiming at wastewater treatment plant effluent improvement at neutral PH: emerging contaminant removal, disinfection, and elimination of antibiotic-resistant bacteria

2021 ◽  
Author(s):  
Maria Clara V. M. Starling ◽  
Elizângela P. Costa ◽  
Felipe A. Souza ◽  
Elayne C. Machado ◽  
Juliana Calábria de Araujo ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Resistant Bacteria ◽  
Antibiotic Resistant Bacteria ◽  
Antibiotic Resistant ◽  
E Coli ◽  
Effluent Quality ◽  
Neutral Ph ◽  
Wastewater Treatment Plant Effluent

AbstractThis work investigated an innovative alternative to improve municipal wastewater treatment plant effluent (MWWTP effluent) quality aiming at the removal of contaminants of emerging concern (caffeine, carbendazim, and losartan potassium), and antibiotic-resistant bacteria (ARB), as well as disinfection (E. coli). Persulfate was used as an alternative oxidant in the solar photo-Fenton process (solar/Fe/S2O82−) due to its greater stability in the presence of matrix components. The efficiency of solar/Fe/S2O82− at neutral pH using intermittent iron additions is unprecedented in the literature. At first, solar/Fe/S2O82− was performed in a solar simulator (30 W m−2) leading to more than 60% removal of CECs, and the intermittent iron addition strategy was proved effective. Then, solar/Fe/S2O82− and solar/Fe/H2O2 were compared in semi-pilot scale in a raceway pond reactor (RPR) and a cost analysis was performed. Solar/Fe/S2O82− showed higher efficiencies of removal of target CECs (55%), E. coli (3 log units), and ARB (3 to 4 log units) within 1.9 kJ L−1 of accumulated irradiation compared to solar/Fe/H2O2 (CECs, 49%; E. coli, 2 log units; ARB, 1 to 3 log units in 2.5 kJ L−1). None of the treatments generated acute toxicity upon Allivibrio fischeri. Lower total cost was obtained using S2O82− (0.6 € m−3) compared to H2O2 (1.2 € m−3). Therefore, the iron intermittent addition aligned to the use of persulfate is suitable for MWWTP effluent quality improvement at neutral pH.

Inactivation of Clostridium perfringens, Total Coliforms, and Escherichia coli by UV/H2O2 in Wastewater Treatment Plant Effluent

2016 ◽  
Vol 19 (1) ◽  
Author(s):  
José Roberto Guimarães ◽  
Regiane Aparecida Guadagnini ◽  
Regina Maura Bueno Franco ◽  
Luciana Urbano dos Santos
Keyword(s):  
Escherichia Coli ◽  
Wastewater Treatment ◽  
Clostridium Perfringens ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Total Coliforms ◽  
Wastewater Treatment Plant Effluent

AbstractThis study evaluated the effectiveness of H

Inactivation of Enterococcus faecalis in simulated wastewater treatment plant effluent by solar photo-Fenton at initial neutral pH

2013 ◽  
Vol 209 ◽  
pp. 195-200 ◽  
Author(s):  
E. Ortega-Gómez ◽  
B. Esteban García ◽  
M.M. Ballesteros Martín ◽  
P. Fernández Ibáñez ◽  
J.A. Sánchez Pérez
Keyword(s):  
Wastewater Treatment ◽  
Enterococcus Faecalis ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Neutral Ph ◽  
Simulated Wastewater ◽  
Wastewater Treatment Plant Effluent
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