scholarly journals CADMIUM-CONTAMINATED SOIL: METAL EXTRACTABILITY AND CHEMICAL KINETICS OF FILTER CAKE ORGANIC MATTER DEGRADATION

Química Nova ◽  
2014 ◽  
Author(s):  
Lucia Pittol Firme ◽  
Felipe Carlos Alvarez Villanueva ◽  
Antonio Arnaldo Rodella
Keyword(s):  
Organic Matter ◽  
Chemical Kinetics ◽  
Contaminated Soil ◽  
Filter Cake ◽  
Organic Matter Degradation ◽  
Metal Extractability ◽  
Kinetics Of ◽  
Soil Metal ◽  
Cadmium Contaminated Soil

scholarly journals Analysis of a High Andean River's Behavior at Loads of Organic Matter Through the Use of Mathematical Models with Experimentally Determined Kinetic Rates

2021 ◽  
Vol 16 (4) ◽  
pp. 675-682
Author(s):  
Carlos Matovelle
Keyword(s):  
Organic Matter ◽  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Control Points ◽  
Organic Matter Degradation ◽  
River Section ◽  
Quality Model ◽  
Secondary Sources ◽  
Kinetic Rates ◽  
Kinetics Of

Using models of organic matter degradation and dissolved oxygen consumption, the concentrations of these compounds are analyzed in two stretches of a river after a discharge of raw sewage. The analyzed river has low drafts and widths, so the velocity is high and the aeration coefficient kr calculated with the Covar method is high, this indicates a rapid recovery of oxygen from the water consumed by the organic matter degradation processes, the river has been instrumented to measure flows and organic matter at various points to calibrate the model. The hydraulic parameters of the river section are analyzed in three control points, in each one sample are taken to analyze oxygen consumption by organic matter and nitrification through laboratory tests to determine and adjust the kinetics of the processes (kd; knit). This kinetics have been used in the development of a water quality model to verify its adjustment, obtaining higher RMSE results than with kinetics from secondary sources. It is observed that the river has an excellent capacity for self-purification due to the high income of dissolved oxygen, with a kr > 9 d-1.

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