scholarly journals Nutrient Export and Periphyton Biomass in a Stream-Lake Basin from the Patagonian Andean Region

2020 ◽  
Author(s):  
Alejandro Sosnovsky ◽  
Mailén Elizabeth Lallement ◽  
Magalí Rechencq ◽  
María Valeria Fernández ◽  
Eduardo Enrique Zattara ◽  
...  
Keyword(s):  
Algal Biomass ◽  
Inorganic Nitrogen ◽  
Light Availability ◽  
Treatment Strategies ◽  
Sustainable Growth ◽  
Lake Basin ◽  
Nutrient Export ◽  
Dissolved Nutrients ◽  
Demographic Pressure ◽  
Periphyton Biomass

AbstractWe characterized how land use influenced dissolved nutrients and periphytic algal biomass in an Andean basin from Northwest Patagonia. Nutrient export, especially dissolved inorganic nitrogen increased with human population density. However, no correlation between nutrient concentration and algal biomass was found, which could instead be limited by light availability. Our results suggest that local N-limited ecosystems are liable to eutrophication by increased demographic pressure and that alternative wastewater treatment strategies are necessary for sustainable growth.

scholarly journals The Role of EU Innovation Policies in the Sustainable Development of the Energy Sector

2017 ◽  
Vol 62 (2) ◽  
pp. 3-19 ◽  
Author(s):  
Olesea Sirbu ◽  
Rodica Crudu ◽  
Augustin Ignatov
Keyword(s):  
European Union ◽  
Sustainable Development ◽  
Energy Sector ◽  
Sustainable Growth ◽  
The European Union ◽  
Demographic Pressure ◽  
The Sustainable Development ◽  
Global Power ◽  
Energy Domain ◽  
The Impact

Abstract In the present conditions when the demographic pressure upon the environment is higher than ever, the humanity faces the challenge of sustainability. Namely the sustainability of human activities is important and nothing can assure it better than sustainable energy supplies. The European Union is the leading global power in terms of adjusting its policies to increase innovation to assure a sustainable growth of its energy sector as a key to an advanced economic system. The present research focuses on the impact of European Union policies on the sustainable development of its energy sector by analyzing quantitatively and qualitatively various indicators intended to offer a throughout insight. The results obtained focus on the identification of the main innovation paradigms; the description of the main modern environmental challenges, especially in the energy domain; the determination of the relation between innovation and energy sustainability, and its analysis at the level of European Union.

Nutrient export and population density relationships in a stream-lake basin from the Patagonian Andean Region

2021 ◽  
pp. 1-9
Author(s):  
Alejandro Sosnovsky ◽  
Mailén Elizabeth Lallement ◽  
Magalí Rechencq ◽  
María Valeria Fernández ◽  
Eduardo Enrique Zattara ◽  
...  
Keyword(s):  
Population Density ◽  
Lake Basin ◽  
Nutrient Export ◽  
Andean Region

Changes in waste stabilisation pond performance resulting from the retrofit of activated sludge treatment upstream: part I – water quality issues

2005 ◽  
Vol 51 (12) ◽  
pp. 11-16 ◽  
Author(s):  
N.J. Cromar ◽  
D.G. Sweeney ◽  
M.J. O'Brien ◽  
H.J. Fallowfield
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Algal Biomass ◽  
Inorganic Nitrogen ◽  
Treatment Plant ◽  
South Australia ◽  
N:P Ratio ◽  
Waste Stabilisation Ponds ◽  
Trickling Filters

This paper describes changes in effluent quality occurring before and after an upgrade to the Bolivar Wastewater Treatment Plant in South Australia. Trickling filters (TF) were replaced with an activated sludge (AS) plant, prior to tertiary treatment using waste stabilisation ponds (WSPs). The water quality in the WSPs following the upgrade was significantly improved. Reductions in total and soluble BOD, COD, TKN, suspended solids and organic nitrogen were recorded and the predominant form of inorganic nitrogen changed from NH4-N to NO2/NO3-N. The reduction in ammonium and potentially toxic free ammonia removed a control upon the growth of zooplankton, which may have contributed to decreases in algal biomass in the final ponds and consequently lower dissolved oxygen. Additionally, changes in inorganic nitrogen speciation contributed to a slightly elevated pH which reduced numbers of faecal coliforms in WSPs. The AS pretreated influent recorded significantly lower inorganic molar N:P ratio (10–4:1) compared to those fed with TF effluent (17–13:1). Algae within the WSPs may now be nitrogen limited, a condition which may favour the growth of nitrogen-fixing cyanobacteria. The decrease in algal biomass and in dissolved oxygen levels may enhance sedimentary denitrification, further driving the system towards nitrogen limitation.

scholarly journals Simulation of dissolved nutrient export from the Dongjiang river basin with a grid-based NEWS model

2018 ◽  
Vol 38 ◽  
pp. 01051
Author(s):  
Qiangqiang Rong ◽  
Meirong Su ◽  
Zhifeng Yang ◽  
Yanpeng Cai ◽  
Wencong Yue ◽  
...  
Keyword(s):  
River Basin ◽  
Inorganic Nitrogen ◽  
Fertilizer Application ◽  
Main Stream ◽  
Nutrient Export ◽  
Biological Fixation ◽  
Nitrogen And Phosphorus ◽  
Model Framework ◽  
Dongjiang River ◽  
Grid Based

In this research, a grid-based NEWS model was proposed through coupling the geographic information system (GIS) with the Global NEWS model framework. The model was then applied to the Dongjiang River basin to simulate the dissolved nutrient export from this area. The model results showed that the total amounts of the dissolved nitrogen and phosphorus exported from the Dongjiang River basin were approximately 27154.87 and 1389.33 t, respectively. 90 % of the two loads were inorganic forms (i.e. dissolved inorganic nitrogen and phosphorus, DIN and DIP). Also, the nutrient export loads did not evenly distributed in the basin. The main stream watershed of the Dongjiang River basin has the largest DIN and DIP export loads, while the largest dissolved organic nitrogen and phosphorus (DON and DOP) loads were observed in the middle and upper stream watersheds of the basin, respectively. As for the nutrient exported from each subbasin, different sources had different influences on the output of each nutrient form. For the DIN load in each subbasin, fertilization application, atmospheric deposition and biological fixation were the three main contributors, while eluviation was the most important source for DON. In terms of DIP load, fertilizer application and breeding wastewater were the main contributors, while eluviation and fertilizer application were the two main sources for DOP.

Dissolved nutrients and organic particulates in water flowing over coral reefs at Lizard Island

1983 ◽  
Vol 34 (6) ◽  
pp. 835 ◽  
Author(s):  
CJ Crossland ◽  
DJ Barnes
Keyword(s):  
Organic Carbon ◽  
Coral Reefs ◽  
Organic Nitrogen ◽  
Inorganic Nitrogen ◽  
Dissolved Nutrients ◽  
Reef Complex ◽  
Nutrient Levels ◽  
Lizard Island ◽  
Nitrogen Phosphorus ◽  
Benthic Zone

Concentrations of dissolved nutrients and organic particulates were measured in seawater flowing across the windward and leeward reef flats of the lagoonal reef complex at Lizard Island. Measurements were made during the day, at night, and at various stages of the tide over a period of several weeks. The reef complex, as a whole, did not consume or export statistically significant amounts of inorganic nitrogen, phosphorus, silicate, organic nitrogen or organic carbon. Depletion or elevation of nutrient levels in one benthic zone appeared to be balanced by production or consumption in downstream zones.

scholarly journals Application of Two Indigenous Strains of Microalgal Chlorella sorokiniana in Cassava Biogas Effluent Focusing on Growth Rate, Removal Kinetics, and Harvestability

Water ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2314
Author(s):  
Mohamad Padri ◽  
Nittaya Boontian ◽  
Neung Teaumroong ◽  
Pongdet Piromyou ◽  
Chatlada Piasai
Keyword(s):  
Nutrient Removal ◽  
Algal Biomass ◽  
Batch Reactor ◽  
Inorganic Nitrogen ◽  
Carbon Sources ◽  
Oxygen Demand ◽  
Biomass Accumulation ◽  
Chlorella Sorokiniana ◽  
Microalgal Biomass ◽  
Process Adjustment

Microalgae cultivation in wastewater is an emerging approach to remove its contaminants and generate microalgal biomass. This study aimed to screen and isolate potential strains in a cassava biogas effluent wastewater (CBEW) treatment system and produce algal biomass. Chlorella sorokiniana strains P21 and WB1DG were isolated from CBEW and found to grow by utilizing various carbon sources. Experiments conducted in a batch reactor using an unsterilized substrate were done to evaluate the nutrient removal and growth of isolated strains from CBEW. The results showed that C. sorokiniana P21 and WB1DG could achieve biomass accumulation of more than 2564 and 1301 mg L−1, respectively. The removal efficiencies of chemical oxygen demand (COD), total phosphorous (TP), and total inorganic nitrogen (TIN) were found up to be 63.42, 91.68, and 70.66%, respectively, in a WB1DG culture and 73.78, 92.11, and 67.33%, respectively, in a P21 culture. Harvestability of the P21 strain was examined using several coagulant–flocculants. FeCl3 was found to remove more than 90% of the cells. Nutrient removal and growth rates resulting from these indigenous strains with application of untreated CBEW support the possibility of this strain being a promising candidate to couple a CBEW treatment and algal biomass generation with minimal process adjustment.

Slow-Release Fertilizer for Rehabilitating Oligotrophic Streams: a Physical Characterization

2000 ◽  
Vol 35 (1) ◽  
pp. 73-94 ◽  
Author(s):  
Megan S. Sterling ◽  
Kenneth I. Ashley ◽  
Abigail B. Bautista
Keyword(s):  
Slow Release ◽  
Specific Growth ◽  
Habitat Degradation ◽  
Inorganic Nitrogen ◽  
Dissolved Inorganic Nitrogen ◽  
Release Rates ◽  
Pellet Size ◽  
Slow Release Fertilizer ◽  
Periphyton Biomass ◽  
Dominance Pattern

Abstract A combination of habitat degradation and overharvesting of anadromous salmonids in many of B.C.’s oligotrophic watersheds has prompted the addition of inorganic nutrients to streams, which increases autotrophic production and aids in the restoration of salmonid production. A new slow-release fertilizer (7-40-0, N-P2O5-K2O, percent by weight) was examined to determine its phosphate (PO43-) release rates using laboratory and field trough experiments. A series of indoor trough experiments indicated that the fertilizer pellet dissolution rate (0.393 g ? days-0.401) was independent of the experimental range of water velocity (0.03-0.30 m . s-1), fertilizer pellet size (2–9 g) and water temperature (8–14.5°C). Resulting phosphate additions (0.5-5 µg P . L-1) in outdoor trough experiments increased periphyton biomass and altered the dominance pattern of periphytic diatoms. An optimal phosphate concentration for periphyton biomass was achieved with calculated 3.0 µg P . L-1 phosphate additions from May to June. In June to July, periphyton biomass increased proportionately to fertilizer additions. Saturation of the relative specific growth rate of the diatom community occurred with 1.0 µg P . L-1 phosphate additions. Nitrogen analysis was not conducted since inorganic nitrogen is typically available in non-limiting concentrations (i.e., >50 µg . L-1 dissolved inorganic nitrogen) in the majority of B.C.’s oligotrophic salmonid streams. These studies indicated that slow-release fertilizer may be effective in stimulating autotrophic production and restoring salmonid production in nutrient deficient streams.

scholarly journals Patterns and persistence of hydrologic carbon and nutrient export from collapsing upland permafrost

2015 ◽  
Vol 12 (12) ◽  
pp. 3725-3740 ◽  
Author(s):  
B. W. Abbott ◽  
J. B. Jones ◽  
S. E. Godsey ◽  
J. R. Larouche ◽  
W. B. Bowden
Keyword(s):  
Aquatic Ecosystems ◽  
Inorganic Nitrogen ◽  
The Arctic ◽  
Nutrient Export ◽  
Initial Pulse ◽  
Dissolved Carbon ◽  
Carbon And Nitrogen ◽  
The North ◽  
North Slope Of Alaska ◽  
High Concentrations

Abstract. As high latitudes warm, vast stocks of carbon and nitrogen stored in permafrost will become available for transport to aquatic ecosystems. While there is a growing understanding of the potential effects of permafrost collapse (thermokarst) on aquatic biogeochemical cycles, neither the spatial extent nor temporal duration of these effects is known. To test hypotheses concerning patterns and persistence of elemental export from upland thermokarst, we sampled hydrologic outflow from 83 thermokarst features in various stages of development across the North Slope of Alaska. We hypothesized that an initial pulse of carbon and nutrients would be followed by a period of elemental retention during feature recovery, and that the duration of these stages would depend on feature morphology. Thermokarst caused substantial increases in dissolved organic carbon and other solute concentrations with a particularly large impact on inorganic nitrogen. Magnitude and duration of thermokarst effects on water chemistry differed by feature type and secondarily by landscape age. Most solutes returned to undisturbed concentrations after feature stabilization, but elevated dissolved carbon, inorganic nitrogen, and sulfate concentrations persisted through stabilization for some feature types, suggesting that aquatic disturbance by thermokarst for these solutes is long-lived. Dissolved methane decreased by 90% for most feature types, potentially due to high concentrations of sulfate and inorganic nitrogen. Spatial patterns of carbon and nutrient export from thermokarst suggest that upland thermokarst may be a dominant linkage transferring carbon and nutrients from terrestrial to aquatic ecosystems as the Arctic warms.

Periphyton as an early indicator of perturbation in recreational lakes

2008 ◽  
Vol 65 (2) ◽  
pp. 258-265 ◽  
Author(s):  
Daniel Lambert ◽  
Antonella Cattaneo ◽  
Richard Carignan
Keyword(s):  
Algal Biomass ◽  
Stoichiometric Composition ◽  
Open Water ◽  
Benthic Microalgae ◽  
Phosphorus Concentration ◽  
Empirical Relationships ◽  
Molar Ratios ◽  
Lake Development ◽  
Periphyton Biomass ◽  
Land Water

We looked for empirical relationships between periphyton biomass and recreational development in the Laurentian lakes of Quebec (Canada). We compared the response of periphyton (as chlorophyll a) on rocks and sediments with that of phytoplankton. Epilithon and epipelon biomass increased significantly with lake recreational development (as percentage of cleared land within a 50 m riparian strip) but was not related with open-water phosphorus concentration. In contrast, phytoplankton was related to open-water phosphorus but did not increase along the gradient of lake development. Periphyton stoichiometric composition also changed with increasing lake development. High C:P and C:N ratios were found in pristine lakes, whereas lower periphyton molar ratios, which approached the optimal stoichiometric composition for benthic microalgae, were observed in the most developed lakes. Our findings suggest that periphyton, positioned near the land–water interface, has access to land-derived nutrients before they are diluted in the open water. Therefore, periphyton on all substrata is the first community to respond to increased inputs resulting from lake recreational development. The measurement of littoral algal biomass and chemical composition may represent a better tool for early detection of lake perturbation than classic methods based on pelagic characteristics.

scholarly journals Are cyanobacteria total, specific and trait abundance regulated by the same environmental variables?

2018 ◽  
Vol 54 ◽  
pp. 3 ◽  
Author(s):  
Diego Frau ◽  
Paula de Tezanos Pinto ◽  
Gisela Mayora
Keyword(s):  
Environmental Variables ◽  
Inorganic Nitrogen ◽  
Light Availability ◽  
Species Abundance ◽  
Predictor Variables ◽  
Total Density ◽  
Nitrogen Fixing ◽  
Specific Level ◽  
Control Factors ◽  
Cyanobacteria Blooms

In this study we analyzed if cyanobacteria total, specific and trait abundance are regulated by the same environmental variables in a Neotropical urban lake that recurrently suffers harmful cyanobacteria blooms. To assess the predictor variables for cyanobacteria total and species density we performed a multiple regression (GLM) and a redundancy analysis (RDA), respectively. Temperature and oxygen were the main predictor variables for both total and species abundance. Conductivity was an exclusive predictor for cyanobacteria total density (GLM) and light availability (Zd:Zeu) for species abundance (RDA). Nutrients were unnoticeable predictor variables for both. Cyanobacteria blooms showed high recurrence (8 blooms in 12 months) and occurred within 17–28 °C. Blooms were mostly dominated by one species, and less frequently co-dominated by two species. These blooms were more recurrently dominated by dispersive non-fixing filamentous species (mainly Raphidiopsis curvata) linked to lower light availability. Less frequently, blooms were dominated by filamentous nitrogen fixers which develop scum blooms (mainly Anabaenopsis arnoldii) related to better light availability and lower dissolved oxygen concentration. The nitrogen fixing species showed high heterocyte density, suggesting nitrogen fixing behavior and probably giving this an advantage when inorganic nitrogen was low. Our results indicate that in absence of nutrients limitation, cyanobacteria total and species abundance can be regulated by different environmental variables. These results also show that species phylogenetically related (R. curvata and A. arnoldii) can respond differently to the prevailing environmental variables; highlighting the importance of considering cyanobacteria to a specific level when assessing their possible control factors.

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