Dissolved oxygen organic removal

Dissolved oxygen concentration profiles with organic removal... 

Dissolved oxygen profiles with combined organic removal and nitrification... 

The treatment of three different coals by leaching with a hot solution of sodium carbonate containing dissolved oxygen under pressure (the Ames process) resulted in significant reduction of total sulfur. While the removal of the inorganic (pyritic plus sulfate) sulfur was obvious, the amount of the organic sulfur removed was subjected to more rigorous analysis. 

As illustrated, many surface water schemes employ ozonation as a pre- and/or post-treatment to GAC adsorption (in some instances, the ozonation process is supplanted by chlorination). Ozonation as a pretreatment to carbon adsorption achieves two basic objectives 1) ozone applied in first stage ozonation, as in the Mulheim and Choisy-le-Roi cases described in Table 2, serves as a disinfectant, a dissolved oxygen (D.O.) input to raw waters of low D.O., and as an aid to more efficient flocculation, which means greater removals in the sedimentation step and 2) ozonation has been shown to convert a rmmber of organic compounds which are otherwise resistant to treatment into forms which can be effectively removed in GAC beds, either by direct adsorption or by bio-oxklation [10 ]. A number of other pretreatments have been found to lengthen carbon... 

However, much of the methane produced in bottom sediments never reaches the atmosphere because it is oxidized to CO2 by microorganisms living in the surficial layers of the sediments and in the oxic, overlying waters. The oxidation of methane by sulfate reducers (or other organisms in the community) also has been examined and it is the principal removal mechanism of methane from shallow marine sediments (24, 25). Methane is also oxidized by certain chemoautotrophic bacteria in the presence of dissolved oxygen, although at much lower rates compared to those observed in sediments (27). 

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