Longitudinal distribution and vertical profile of pH, temperature and dissolved oxygen in a partially aerated facultative pond

2000 ◽  
Vol 42 (10-11) ◽  
pp. 75-81
Author(s):  
H. N. Melo ◽  
P. Guimarães ◽  
J. L. Melo
Keyword(s):  
Dissolved Oxygen ◽  
Vertical Profile ◽  
Thermal Stratification ◽  
Soft Drink ◽  
Isothermal Condition ◽  
Bottom Layer ◽  
Longitudinal Distribution ◽  
Good Efficiency ◽  
Photosynthetic Activities ◽  
Constant Gradient

The system consists of a partially aerated facultative pond with a polished area that treats the effluents of a soft drink industry in Brazil. This work concerns on the study of the longitudinal distribution as well as the analysis of the vertical profile of the main control parameters which exerts a direct influence on the metabolism of the system. The results show the existence of a horizontal thermal gradient between aerated and polishing zones, which is more intense at the surface of the first 40 metres. The vertical profile did not identify a tendency to thermal stratification. The constant gradient vertical of 0.1°C in the aerated and polishing zones characterizes an almost isothermal condition. The decrease of the effluent pH values was observed in the bottom layer of the pond. This indicates that the anaerobic digestion on the sedimented sludge incorporates acids in the liquid mass. The dissolved oxygen vertical distribution presents negative clinographic profile. The isolines in the aerated zone indicate good efficiency of oxygen transfer. In the polishing zone, concentrations above 2.0 mg/l were observed down to a depth of 1 m, possibly caused by photosynthetic activities.

scholarly journals Growth factor dependent changes in nanoscale architecture of focal adhesions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Karin Legerstee ◽  
Tsion E. Abraham ◽  
Wiggert A. van Cappellen ◽  
Alex L. Nigg ◽  
Johan A. Slotman ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Intermediate Layer ◽  
Cell Movement ◽  
Focal Adhesions ◽  
Bottom Layer ◽  
Vertical Axis ◽  
Longitudinal Distribution ◽  
Structured Illumination ◽  
Structured Illumination Microscopy ◽  
Mediate Cell

AbstractFocal adhesions (FAs) are flat elongated structures that mediate cell migration and link the cytoskeleton to the extracellular matrix. Along the vertical axis FAs were shown to be composed of three layers. We used structured illumination microscopy to examine the longitudinal distribution of four hallmark FA proteins, which we also used as markers for these layers. At the FA ends pointing towards the adherent membrane edge (heads), bottom layer protein paxillin protruded, while at the opposite ends (tails) intermediate layer protein vinculin and top layer proteins zyxin and VASP extended further. At the tail tips, only intermediate layer protein vinculin protruded. Importantly, head and tail compositions were altered during HGF-induced scattering with paxillin heads being shorter and zyxin tails longer. Additionally, FAs at protruding or retracting membrane edges had longer paxillin heads than FAs at static edges. These data suggest that redistribution of FA-proteins with respect to each other along FAs is involved in cell movement.

scholarly journals Assessment of the physicochemical variables of a subtropical reservoir in the northwest of Argentina

2014 ◽  
Vol 26 (4) ◽  
pp. 367-380 ◽  
Author(s):  
Beatriz Concepción Tracanna ◽  
Silvia Nelly Martínez De Marco ◽  
María de los Ángeles Taboada ◽  
Virginia Mirande ◽  
María de Lourdes Gultemirian ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Physicochemical Parameters ◽  
Thermal Stratification ◽  
Oxygen Demand ◽  
Limiting Factor ◽  
Alkaline Ph ◽  
A Value ◽  
Sodium Calcium ◽  
Calcium Bicarbonate ◽  
Laboratory Results

AIM: The Escaba dam is located in the south of the Tucumán province, Argentina, at 650 m above sea level. It has an extension of 541 ha. and a depth of 65 m and its tributaries are the Chavarría, Las Moras, El Chorro and Singuil rivers. The climate is mild with dry winters and rainy summers. The objective of this study was to characterize physicochemical parameters in the limnetic zone of the dam and the mouths of the tributaries to determine the water quality. METHODS: Seasonal sampling was carried out between August 2010 and May 2012. Temperature, transparency, pH and electrical conductivity were field measured, whereas dissolved oxygen, biochemical oxygen demand (BOD5), major ion constituents and nitrogen and phosphate compounds were analyzed at the laboratory. RESULTS: The water was classified as sodium-calcium-bicarbonate with neutral to alkaline pH, and thermal stratification during spring and summer. The water assayed was well oxygenated except for the bottom of the limnetic zone during the summer months. Lowest transparency was measured in the El Chorro River in November 2011 (0.12 m) and highest degree of transparency in the Singuil River during the winter of 2010 (4.1 m). The waters assayed showed weak mineralization with conductivities between 83 and 218 µS.cm-1. Maximum BOD5 value (183 mg.L-1) was measured in the Singuil River in spring 2010. Highest values for the different nitrogen compounds were as follows: 7 mg NO3-.L-1 at the bottom of the limnetic zone in August 2010, 0.07 mg NO2-.L-1 in the Las Moras River in May 2011 and 1.8 mg NH4+.L-1 in the Chavarría River in March 2011. During the summer of 2012 orthophosphate reached a value of 0.22 mg.L-1 at the bottom of the limnetic zone. The TN/TP ratio revealed that phosphate was generally the limiting factor and rarely nitrogen. CONCLUSIONS: Considering the TN, TP and transparency parameters the ecosystem was classified as hypertrophic. PCA allowed a seasonal differentiation of the sites, and components 1 and 2 classified the samples according to nutrient gradient, dissolved oxygen, BOD5 and temperature.

Studies of the hydrobiology of a tropical lake in north-western Queensland. II. Seasonal changes in thermal and dissolved oxygen characteristics

1980 ◽  
Vol 31 (5) ◽  
pp. 589 ◽  
Author(s):  
CM Finlayson ◽  
TP Farrell ◽  
DJ Griffiths
Keyword(s):  
Dissolved Oxygen ◽  
Water Column ◽  
Environmental Conditions ◽  
Seasonal Changes ◽  
Thermal Stratification ◽  
Oxygen Depletion ◽  
Tropical Lake ◽  
North Western

The stratification characteristics of Lake Moondarra (24�34'S.,139�35'E.), a man-made lake in north- western Queensland, have been studied. Evidence is presented that the lake approximates the warm polymictic type in which no persistent thermal stratification ever develops. During the cooler months, thermal stratification breaks down during the night; in the warmer months, the intense rainstorms prevent the establishment of a persistently stratified water column. The shallowness of the lake relative to its surface areaand the prevailing environmental conditions ensure that extensive periods of oxygen depletion do not develop in the water column. It is concluded that a strong and prolonged period of thermal stratification, with subsequent serious effects of the availability of dissolved oxygen in the deeper layers, would only arise if, in a particular year. there were no significant rainstorms.

Effects of rainfall on thermal stratification and dissolved oxygen in a deep drinking water reservoir

2020 ◽  
Vol 34 (15) ◽  
pp. 3387-3399
Author(s):  
Miao Liu ◽  
Yunlin Zhang ◽  
Kun Shi ◽  
Yibo Zhang ◽  
Yongqiang Zhou ◽  
...  
Keyword(s):  
Drinking Water ◽  
Dissolved Oxygen ◽  
Thermal Stratification ◽  
Water Reservoir ◽  
Drinking Water Reservoir

scholarly journals Eutrophication mitigation in rivers: 30 years of trends in spatial and seasonal patterns of biogeochemistry of the Loire River (1980–2012)

2015 ◽  
Vol 12 (8) ◽  
pp. 2549-2563 ◽  
Author(s):  
C. Minaudo ◽  
M. Meybeck ◽  
F. Moatar ◽  
N. Gassama ◽  
F. Curie
Keyword(s):  
Dissolved Oxygen ◽  
Chlorophyll A ◽  
Seasonal Variations ◽  
River System ◽  
Longitudinal Distribution ◽  
Seasonal Patterns ◽  
Nutrient Load ◽  
Main River ◽  
Loire River ◽  
Monthly Survey

Abstract. Trends and seasonality analysis from 1980 onward and longitudinal distribution, from headwaters to estuary, of chlorophyll a, nitrate and phosphate were investigated in the eutrophic Loire River. The continuous decline of phosphate concentrations which has been recorded since 1991 both in the main river and in the tributaries has led to the conclusion that it was responsible for the significant reduction in phytoplanktonic biomass across the whole river system, although Corbicula spp. clams invaded the river during the same period and probably played a significant role in the phytoplankton decline. While eutrophication remained lower in the main tributaries than in the Loire itself, they were found to contribute up to ≈ 35% to the total nutrient load of the main river. The seasonality analysis revealed significant seasonal variations for the different eutrophication metrics and calls into question the classical monthly survey recommended by national or international authorities. Reducing P inputs impacted these seasonal variations: the decline of seasonal amplitudes of chlorophyll a reduced the seasonal amplitude of orthophosphate and of daily variations of dissolved oxygen and pH but did not significantly affect the seasonal amplitude of nitrate. Thus, the influence of phytoplankton on seasonal variations of nitrate was minor throughout the period of study.

Factors affecting distribution pattern of dominant macroinvertebrates in Mantovo Reservoir (Republic of Macedonia)

Biologia ◽  
2012 ◽  
Vol 67 (6) ◽  
Author(s):  
Valentina Slavevska-Stamenković ◽  
Momir Paunović ◽  
Stoe Smiljkov ◽  
Trajče Stafilov ◽  
Dana Prelić ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Distribution Pattern ◽  
Environmental Variables ◽  
Longitudinal Distribution ◽  
Factors Affecting ◽  
Republic Of Macedonia ◽  
Spatial And Temporal Heterogeneity ◽  
Oxygen Condition ◽  
The Relationship ◽  
Macroinvertebrate Species

AbstractIn the present study, we analysed spatial and temporal heterogeneity of the limnological characteristics to provide more detailed information about the processes taking place within Mantovo Reservoir (Republic of Macedonia). The relationship between principal macroinvertebrate species and environmental variables was analysed in order to explore factors that dominantly affect community distribution pattern. Unlike the most reservoirs, strong longitudinal gradient for suspended organic matter and nutrients (total phosphorous, nitrates and nitrites) along the reservoir doesn’t exist. However, the process of thermal stratification has a strong influence on the metabolism and structure of the Mantovo ecosystem, which can be demonstrated by the vertical and longitudinal distribution of dissolved oxygen (DO), CO2, pH and metals concentrations. Canonical Correspondence Analysis (CCA) indicated that the main factors controlling spatial distribution of Limnodrilus hoffmeisteri and Chironomus plumosus group were temperature, dissolved oxygen and manganese, including sulphates for C. plumous group. Chaoborus crystallinus showed opposite distribution pattern. Cladotanytarsus mancus group was strongly associated with shallower part (littoral and sublittoral) of Mantovo Reservoir characterized by favourable oxygen condition. None of the environmental variables included in CCA showed any relationship with density of Procladius sp.

scholarly journals Oxygen conditions and trophic state of Lake Głębokie (Szczecin, Poland) in the years 2008-2010

2010 ◽  
Vol 10 (3-4) ◽  
pp. 163-172 ◽  
Author(s):  
Arkadiusz Nędzarek ◽  
Agnieszka Tórz ◽  
Jacek Kubiak
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Saturation ◽  
Water Temperature ◽  
Thermal Stratification ◽  
Trophic State ◽  
Winter Season ◽  
Eutrophic Lake ◽  
Vertical Profiles ◽  
Oxygen Oxygen ◽  
Oxygen Conditions

Oxygen conditions and trophic state of Lake Głębokie (Szczecin, Poland) in the years 2008-2010The research in Lake Głębokie was conducted in the years 2008-2010. Sampling from three selected sites was designed in such a way that vertical profiles of the characteristics of interest were obtained. Measurements were performed to determine the content of dissolved oxygen, oxygen saturation expressed as a percentage, water temperature, total phosphorus, chlorophyll a, dry seston mass, and Secchi disk depth. During the course of a year, water temperature varied from 0.58°C to 24.72°C. However, a permanent thermal stratification was not observed in the summer season due to complete water mixing. Dissolved oxygen concentrations in the water varied within a range that started at hard-to-measure insignificant values and reached up to 9.63 mg O2 l-1, while oxygen saturation reached a maximum of 116% O2. At the same time, it was observed that oxygen conditions gradually worsened as the depth became greater. The largest oxygen deficits occurred in the winter season of 2009-2010. The oxygen conditions were typical for an eutrophic lake. Its high trophic state was confirmed by an analysis performed using the method proposed by Carlson (1977) as well as by an analysis performed according to the directives of the OECD (1982). The trophic state of this lake is borderline eutrophic and hypertrophic. The oxygen conditions found in this lake ought to be seen as not beneficial to fish.

scholarly journals Suboxic and anoxic conditions in the Gdansk basins’ deep water (the Baltic sea)

2019 ◽  
Vol 59 (5) ◽  
pp. 714-723
Author(s):  
K. V. Artamonova ◽  
A. N. Demidov ◽  
O. A. Zuev
Keyword(s):  
Dissolved Oxygen ◽  
Baltic Sea ◽  
Oxygen Concentration ◽  
Deep Water ◽  
Hydrogen Sulphide ◽  
Bottom Layer ◽  
Oxygen Distribution ◽  
The Baltic Sea ◽  
Anoxic Conditions ◽  
The Baltic

Variability of oxygen and hydrogen sulphide concentrations in the Gdansk basins deep water of the Baltic Sea for the last 25 years was analyzed. It was shown that suboxic and anoxic conditions in deep water were mainly determined by Baltic inflow frequency and intensity. Oxygen concentration in the bottom layer of the Gdansk basins increased strongly in 13 months after Major Baltic Inflow events (MBI). There were three periods of strong increasing of dissolve oxygen concentration in deep water since 1992 till 2018 after MBI in 1993, in 2003 and 20142016. It was shown that at the bottom of the Gdansk basins hydrogen sulphide was detected during 79 months till 22.5 years after MBI. Quality evaluation of dissolved oxygen distribution reanalysis was also conducted in this work. It can be noted good reproduction of field data by the reanalysis in its quality part; however, in most cases the observable maximum concentrations in dissolved oxygen distribution are understated, sometimes even several times.

scholarly journals Variability of dissolved oxygen in the bottom layer of the southern Senegalese shelf

2021 ◽  
Author(s):  
A. W. Tall ◽  
E. Machu ◽  
V. Echevin ◽  
X. Capet ◽  
A. Pietri ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Bottom Layer
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