scholarly journals Oxygen demand during mineralization of aquatic macrophytes from an oxbow lake

2008 ◽  
Vol 68 (1) ◽  
pp. 61-67 ◽  
Author(s):  
I. Bianchini Jr. ◽  
MB. Cunha-Santino ◽  
AM. Peret
Keyword(s):  
Aquatic Macrophytes ◽  
Oxygen Demand ◽  
Oxbow Lake ◽  
Short Term ◽  
River Floodplain ◽  
Dissolved Carbon ◽  
Eichhornia Azurea ◽  
Aerobic Decomposition ◽  
Cyperus Giganteus ◽  
Egeria Najas

This study presents a kinetic model of oxygen consumption during aerobic decomposition of detritus from seven species of aquatic macrophytes: Cabomba furcata, Cyperus giganteus, Egeria najas, Eichhornia azurea, Salvinia auriculata, Oxycaryum cubense and Utricularia breviscapa. The aquatic macrophytes were collected from Óleo Lagoon situated in the Mogi-Guaçu river floodplain (SP, Brazil). Mineralization experiments were performed using the closed bottles method. Incubations made with lake water and macrophytes detritus (500 mL and 200 mg.L-1 (DM), respectively) were maintained during 45 to 80 days at 20 °C under aerobic conditions and darkness. Carbon content of leachates from aquatic macrophytes detritus and dissolved oxygen concentrations were analyzed. From the results we concluded that: i) the decomposition constants differ among macrophytes; these differences being dependent primarily on molecular and elemental composition of detritus and ii) in the short term, most of the oxygen demand seems to depend upon the demineralization of the dissolved carbon fraction.

Validation of On-line Respiration Meter and its Applications by Computer Simulation

1992 ◽  
Vol 26 (5-6) ◽  
pp. 1355-1363 ◽  
Author(s):  
C-W. Kim ◽  
H. Spanjers ◽  
A. Klapwijk
Keyword(s):  
Steady State ◽  
Activated Sludge ◽  
Respiration Rate ◽  
Oxygen Demand ◽  
Operating Conditions ◽  
Mass Balances ◽  
Short Term ◽  
Respiration Rates ◽  
On Line ◽  
Made In

An on-line respiration meter is presented to monitor three types of respiration rates of activated sludge and to calculate effluent and influent short term biochemical oxygen demand (BODst) in the continuous activated sludge process. This work is to verify if the calculated BODst is reliable and the assumptions made in the course of developing the proposed procedure were acceptable. A mathematical model and a dynamic simulation program are written for an activated sludge model plant along with the respiration meter based on mass balances of BODst and DO. The simulation results show that the three types of respiration rate reach steady state within 15 minutes under reasonable operating conditions. As long as the respiration rate reaches steady state the proposed procedure calculates the respiration rate that is equal to the simulated. Under constant and dynamic BODst loading, the proposed procedure is capable of calculating the effluent and influent BODst with reasonable accuracy.

scholarly journals Suitability of Macrophytes for Wastewater Treatment and Biogas Generation

2019 ◽  
Vol 9 (2S2) ◽  
pp. 16-18
Keyword(s):  
Wastewater Treatment ◽  
Water Hyacinth ◽  
Aquatic Macrophytes ◽  
Aquatic Macrophyte ◽  
Biogas Production ◽  
Oxygen Demand ◽  
Cow Dung ◽  
Water Lettuce ◽  
Before And After ◽  
Almost All

In this paper three sustainable approaches are made in waste management option. Firstly primary treated domestic sewage is treated by aquatic macrophytes using duckweed, water hyacinth and water lettuce. Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Total Dissolved Solids (TDS), Phosphate, Nitrates are tested before and after. Result indicates in terms of water quality, almost all three plants shows same removal efficiencies. BOD and TSS removal efficiency is attained more than 95%. COD and TDS removal is reached upto 50% for almost all plants. Secondly the used aquatic macrophytes for wastewater treatment is again used for generation of biogas (water lettuce unit, duckweed unit, water lettuce unit). In addition to three aquatic macrophytes, sludge is collected from aquatic macrophyte unit for generation of biogas. Comparison is made with conventional cow dung biogas unit. Result indicates water lettuce and duckweed produce biogas at earlier stage itself and water hyacinth takes some time for starting of biogas production. This may be due to the structure and texture causes some time for decomposition. Sludge gives maximum biogas generation among all experimental setup. Also in this study cow dung did not give biogas more may be due to poor blend ratio of cow dung with water is one of the reason.

scholarly journals Patterns of the aquatic macrophyte cover in Cachoeira Dourada Reservoir (GO-MG)

2005 ◽  
Vol 65 (1) ◽  
pp. 19-24 ◽  
Author(s):  
L. M Bini ◽  
L. G Oliveira ◽  
D. C Souza ◽  
P. Carvalho ◽  
M. P. Pinto
Keyword(s):  
Aquatic Macrophytes ◽  
Positive Relationship ◽  
Aquatic Macrophyte ◽  
Main Body ◽  
Frequency Of Occurrence ◽  
Frequent Species ◽  
Eichhornia Azurea ◽  
The Relationship ◽  
Macrophyte Cover

The relationship between the aquatic macrophyte cover in upper segments of tributaries and this cover in these tributaries but near the reservoir's main body was tested. Sixteen taxa belonging to 12 families of aquatic macrophytes were recorded in Cachoeira Dourada Reservoir. The most frequent species were Eichhornia azurea (frequency of occurrence = 92%; n = 37 sites) and E. crassipes (44%). Upper segments of the tributaries were the main areas colonized by these aquatic macrophytes. The positive relationship between the aquatic macrophyte cover between the upper and lower segments of tributaries indicates the importance of dispersion in the colonization of the arms and the reservoir's main body.

scholarly journals Levantamento da infestação de plantas aquáticas em Porto Primavera antes do enchimento final do reservatório

2009 ◽  
Vol 27 (spe) ◽  
pp. 879-886 ◽  
Author(s):  
D Martins ◽  
R.A Pitelli ◽  
M.S Tomazella ◽  
R.H Tanaka ◽  
A.C.P Rodrigues
Keyword(s):  
Eichhornia Crassipes ◽  
Pistia Stratiotes ◽  
Alternanthera Philoxeroides ◽  
Typha Angustifolia ◽  
Pontederia Cordata ◽  
Eichhornia Azurea ◽  
Echinochloa Polystachya ◽  
Polygonum Lapathifolium ◽  
Paspalum Repens ◽  
Egeria Najas

O objetivo deste trabalho foi identificar as plantas aquáticas e os níveis de infestação de cada espécie em Porto Primavera antes do enchimento final do reservatório. Foram avaliados todos os focos de vegetação aquática no reservatório (72 pontos), sendo os pontos demarcados com um aparelho de GPS. As espécies foram identificadas e estimouse visualmente (tamanho da área) a distribuição proporcional das plantas no foco de infestação. Após a identificação, foram encontradas 18 espécies de plantas aquáticas vegetando no reservatório, das quais foram determinadas a frequência de espécie de planta aquática e a distribuição dentro do sistema de geração de energia. As espécies encontradas no reservatório foram: Eichhornia crassipes, Eichhornia azurea, Pistia stratiotes, Paspalum repens, Cyperus brevifolius, Paspalum conspersum, Echinochloa polystachya, Egeria densa, Egeria najas, Polygonum hidropiperoides, Polygonum lapathifolium, Alternanthera philoxeroides, Eleocharis sellowiana, Nymphaea ampla, Pontederia cordata, Salvinia auriculata, Salvinia rotundifolia e Typha angustifolia. As maiores frequências relativas foram observadas em: E. azurea (36,11%), E. crassipes (16,67%), P. stratiotes (13,89%), S. auriculata (13,89%), C. brevifolius (11,11%) e P. lapathifolium (6,94%).

Short term sediment accumulation rates reveal seasonal time lags between sediment delivery and deposition in an oxbow lake

2019 ◽  
Vol 281 ◽  
pp. 92-99 ◽  
Author(s):  
Daniel G. Wren ◽  
Jason M. Taylor ◽  
J.R. Rigby ◽  
Martin A. Locke ◽  
Lindsey M.W. Yasarer
Keyword(s):  
Sediment Accumulation ◽  
Oxbow Lake ◽  
Time Lags ◽  
Accumulation Rates ◽  
Short Term ◽  
Sediment Delivery

scholarly journals Periphytic Cosmarium (Zygnematophyceae, Desmidiaceae) in lentic environments of the Upper Paraná River floodplain: Taxonomy and ecological aspects

2018 ◽  
Vol 30 (0) ◽  
Author(s):  
Nicolli Cristina Osório ◽  
Aparecida Miranda Polinario ◽  
Bárbara Dunck ◽  
Kisay Lorena Adame ◽  
Luciana Carapunarla ◽  
...  
Keyword(s):  
Paraná River ◽  
Taxonomic Study ◽  
Ecological Studies ◽  
River Floodplain ◽  
Parana River ◽  
Ecological Aspects ◽  
Eichhornia Azurea ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Paraná River Floodplain

Abstract Aim A taxonomic study of the species of the genus Cosmarium Corda ex Ralfs (Desmidiaceae) was conducted in two lentic environments of the Upper Paraná River Floodplain (Garças and Patos lakes). Methods The samples were collected in November 2016. Two petioles of Eichhornia azurea (Sw) Kunth were sampled and analyzed qualitatively. Results Six species, nine varieties, and three forms were identified, with five taxa being common to both lakes, nine in Garças Lake, and four in Patos Lake. Of this, thirteen species represent the first records for the floodplain environment. Conclusion This study contributes to the knowledge of the biodiversity of this region, providing support for future ecological studies and biomonitoring.

scholarly journals Fish associated with aquatic macrophytes in the Chacororé-Sinhá Mariana Lake system and Mutum River, Pantanal of Mato Grosso, Brazil

2009 ◽  
Vol 69 (1) ◽  
pp. 101-108 ◽  
Author(s):  
EB. Pacheco ◽  
CJ. Da-Silva
Keyword(s):  
Eichhornia Crassipes ◽  
Aquatic Macrophytes ◽  
Biological Diversity ◽  
Aquatic Macrophyte ◽  
Environmental Conservation ◽  
Left Bank ◽  
Mato Grosso ◽  
Analysis Of Similarity ◽  
Eichhornia Azurea ◽  
Macrophyte Species

On the left bank of the Cuibá River, one of the main tributaries of the Pantanal in Mato Grosso, are located the Chacororé and Sinhá Mariana Lakes and the Mutum River, the littoral regions of which are covered with aquatic macrophytes, dominated by the species Eichhornia crassipes and Eichhornia azurea. To examine the ichthyofauna associated with this vegetation, in the year 2003, 3510 fish were collected, distributed among 83 species, and the limnological variables verified near the macrophyte stands where they were sampled. The most abundant and richest order was the Characiformes, followed by the Gymnotiformes and Siluriformes. Analysis of similarity showed a very low, or null, index that the limnological conditions and morphology of the aquatic macrophyte species provide habitat sufficiently homogeneous to give. The limnological conditions and morphology of the aquatic macrophyte species provide a sufficient habitat heterogeneity to give very low, or null, index values. Thus, environmental conservation measures should be more effective in promoting the conservation of the species, given the high levels of biological diversity found in the habitats studied.

scholarly journals Caloric density of aquatic macrophytes in different environments of the Baía river subsystem, upper Paraná river floodplain, Brazil

2006 ◽  
Vol 49 (5) ◽  
pp. 835-842 ◽  
Author(s):  
Célia de Almeida Lopes ◽  
Anna Christina Esper Amaro de Faria ◽  
Gislaine Iachstel Manetta ◽  
Evanilde Benedito-Cecilio
Keyword(s):  
Aquatic Macrophytes ◽  
Dry Weight ◽  
Paraná River ◽  
Ecological Groups ◽  
River Floodplain ◽  
Caloric Density ◽  
Parana River ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Paraná River Floodplain

The aim of this work was to determine the caloric density of leaves, stems and roots of aquatic macrophytes in different environments of the Baía subsystem (Baía river and Fechada and Guaraná lagoons) on the Upper Paraná river floodplain, in addition to identify the variability between ecological groups. Samplings of Eichhornia crassipes, Salvinia spp, Pistia stratiotes, Eichhornia azurea, Polygonum sp, Cyperaceae and Poaceae were carried out in February 2003. Spatial differences in the caloric densities were not observed for these plants. Caloric density values varied from 1906.9 cal/g dry weight (root) to 4675.0 cal/g dry weight (leaf). However, significant differences between the caloric content averages of the vegetative structures were observed only for Polygonum sp and Salvinia spp. In relation to the ecological groups, the highest average value was verified for the emergent macrophytes (3529.7 ± 722.5), which were significantly different from the floating ones (3056.5 ± 571.0). There was no difference between the sites included in the subsystem when the caloric densities were compared.

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