Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Oxygen conditions consumption, sediment

An oxygen concentration profile such as the one which has been measured in situ (Fig. 3.5) or modeled (Fig. 15.5) is mostly interpreted in terms of a stationary condition (steady state) resulting from the consumption of oxygen in the sediment and its resupply by means of diffusion. Its consumption in the sediment is due to the oxidation of organic matter and other redox processes, such as the re-oxidation of divalent manganese. But how long does it take until such a stationary condition is reached ... [Pg.531]

The total oxygen consumption at the transition between sediment and bottom water is measmed in so-called incubation experiments which are best to be carried out under in situ conditions. To this end, a distinct area of the sediment surface area (usually several dm ) is covered with a closed box in such a maimer that a part of the bottom water is entrapped. Inside the closed box, the concentrations of oxygen and/or nutrients are repeatedly measured over a sufficient length of time. The total exchange of substances is deduced from the measured concentration changes in relation to the volume of entrapped bottom water and the area under study. [Pg.111]

Fig. 15.7 Calculation of the equilibrium between oxygen consumption occurring during the oxidation of sedimentary organic matter near the sediment surface and resupply of oxygen by means of diffusion. Here, oxygen consumption is assumed to follow first-order kinetics. Application of Pick s Second Law in an explicit numeric solution permits a reliable calculation of the times required for the adjustment of a stationary condition. Fig. 15.7 Calculation of the equilibrium between oxygen consumption occurring during the oxidation of sedimentary organic matter near the sediment surface and resupply of oxygen by means of diffusion. Here, oxygen consumption is assumed to follow first-order kinetics. Application of Pick s Second Law in an explicit numeric solution permits a reliable calculation of the times required for the adjustment of a stationary condition.

See other pages where Oxygen conditions consumption, sediment is mentioned: [Pg.112]    [Pg.881]    [Pg.131]    [Pg.304]    [Pg.521]    [Pg.202]    [Pg.553]    [Pg.161]    [Pg.104]    [Pg.368]    [Pg.553]    [Pg.470]    [Pg.111]    [Pg.150]    [Pg.23]    [Pg.148]    [Pg.899]    [Pg.301]    [Pg.158]    [Pg.163]    [Pg.298]    [Pg.362]    [Pg.382]    [Pg.93]    [Pg.68]    [Pg.198]    [Pg.213]    [Pg.168]    [Pg.435]    [Pg.773]    [Pg.90]    [Pg.296]    [Pg.393]   


SEARCH



Oxygen conditions

Oxygen sediments

© 2024 chempedia.info