Wet oxidation of organic matter employing mixed perchloric and sulphuric acids at controlled temperatures and graded high potentials

Talanta ◽  
1959 ◽  
Vol 2 (3) ◽  
pp. 209-219 ◽  
Author(s):  
H Diehl
Keyword(s):  
Organic Matter ◽  
Wet Oxidation ◽  
High Potentials

scholarly journals Mercury Methylation and Demethylation in Anoxic Lake Sediments and by Strictly Anaerobic Bacteria

1998 ◽  
Vol 64 (3) ◽  
pp. 1013-1017 ◽  
Author(s):  
K.-R. Pak ◽  
R. Bartha
Keyword(s):  
Organic Matter ◽  
Anaerobic Bacteria ◽  
Mercury Methylation ◽  
Strictly Anaerobic ◽  
Anoxic Sediment ◽  
Acetogenic Bacteria ◽  
High Potentials ◽  
High Mercury ◽  
Pure Cultures ◽  
Sediment Ph

ABSTRACT After spiking anoxic sediment slurries of three acidic oligotrophic lakes with either HgCl2 at 1.0 μg/ml or CH3HgI at 0.1 μg/ml, both mercury methylation and demethylation rates were measured. High mercury methylation potentials were accompanied by high demethylation potentials in the same sediment. These high potentials correlated positively with the concentrations of organic matter and dissolved sulfate in the sediment and with mercury levels in fish. Adjustment of the acidic sediment pH to neutrality failed to influence either the methylation or the demethylation rate of mercury. The opposing methylation and demethylation processes converged to establish similar Hg2+-CH3Hg+equilibria in all three sediments. Because of their metabolic dominance in anoxic sediments, mercury methylation and demethylation in pure cultures of sulfidogenic, methanogenic, and acetogenic bacteria were also measured. Sulfidogens both methylated and demethylated mercury, but the methanogen tested only catalyzed demethylation and the acetogen neither methylated nor demethylated mercury.

THE WET OXIDATION OF ORGANIC MATTER IN SEAWATER

1969 ◽  
Vol 14 (2) ◽  
pp. 292-297 ◽  
Author(s):  
P. J. LEB. WILLIAMS
Keyword(s):  
Organic Matter ◽  
Wet Oxidation

Hydrothermal degradation of organic matter in municipal sludge using non-catalytic wet oxidation

2015 ◽  
Vol 260 ◽  
pp. 846-854 ◽  
Author(s):  
Saeid Baroutian ◽  
Anne-Marie Smit ◽  
John Andrews ◽  
Brent Young ◽  
Daniel Gapes
Keyword(s):  
Organic Matter ◽  
Wet Oxidation ◽  
Municipal Sludge ◽  
Catalytic Wet Oxidation ◽  
Hydrothermal Degradation

Relationships between three measures of organic matter or carbon in soils of eucalypt plantations in Tasmania

Soil Research ◽  
1996 ◽  
Vol 34 (4) ◽  
pp. 545 ◽  
Author(s):  
XJ Wang ◽  
PJ Smethurst ◽  
AM Herbert
Keyword(s):  
Organic Matter ◽  
Complete Recovery ◽  
Parent Material ◽  
Wet Oxidation ◽  
Loss On Ignition ◽  
Structural Water ◽  
Parent Materials ◽  
Eucalypt Plantations ◽  
Highly Correlated ◽  
Dry Combustion

Organic carbon or organic matter in acidic Tasmanian soils supporting eucalypt plantations was measured by dry combustion using a LECO CHIN-1000 Analyzer (CT), wet oxidation by the Walkley-Black method (CW&B), and loss-on-ignition (LOI at 375°C). CT and CW&B were highly correlated in 119 surface and subsoil samples, and on average, CW&B provided near complete recovery of CT (97%). Although LOI may have released some structural water from the fine-textured soils, and apart from granite-derived soils which need further study, strong regressions were found between LOI and both CW&B and CT which were specific for either basalt or non-basalt soils. Within the non-basalt soils, parent material had little effect on these relationships, although there were large differences in C concentrations of surface soils between soils of different parent materials. The relationships of CW&B and CT to LOI in the basalt soils were significantly different from those in the non-basalt soils.

Ozonation and Wet Oxidation in the Treatment of Thermomechanical Pulp (TMP) Circulation Waters

1999 ◽  
Vol 40 (11-12) ◽  
pp. 51-58 ◽  
Author(s):  
A. Laari ◽  
S. Korhonen ◽  
T. Tuhkanen ◽  
S. Verenich ◽  
J. Kallas
Keyword(s):  
Organic Matter ◽  
Membrane Filtration ◽  
Low Pressure ◽  
Point Of View ◽  
Rate Coefficients ◽  
Thermomechanical Pulp ◽  
Wet Oxidation ◽  
Catalytic Wet Oxidation ◽  
Subsequent Increase ◽  
Moderate Rate

Ozonation and wet oxidation were studied as means of the treatment of thermomechanical pulp (TMP) processing waters. There were two objectives of the experimental research concerning circulation waters: to reduce concentration of lipophilic wood extractives (LWEs) and to treat the concentrated residues from evaporation and membrane filtration by low-pressure catalytic wet oxidation. Ozone was found to selectively react with LWEs. The selectivity of ozonation defined as the ratio of the rate coefficients of the reactions with LWEs and other organic matter was found to be from 3 to 20. The reaction was always found to be of fast or moderate rate and, therefore, no dissolved ozone could be detected in water during ozonation. However, the ozone dose necessary to remove 90% of the LWEs in TMP water was found to be rather high, from 500 to 800 mg O3/l. This was determined by high content of organic matter, COD ranged between 3 and 6 kg O2/m3. The implementation of ozone for LWEs removal is therefore problematic from economical point of view. Catalytic low pressure-wet oxidation of membrane and evaporation concentrates was found to be effective: 50% of COD were removed under 150°C with subsequent increase of the wastewater biodegradability.

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