Process for treating a medium containing organic constituents
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United States of America Patent
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Jun 9, 1998
Grant Date -
N/A
app pub date -
Jan 21, 1997
filing date -
May 5, 1994
priority date (Note) -
Expired
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Abstract
A process is proposed for the chemical oxidative treatment of a medium, e.g. sewage sludge, containing organic constituents, which comprises two process steps. In the first process step, the medium is heated to a first preset low temperature range and kept in this temperature range for a preset treatment duration. In a second process step, the sludge is then heated to a second preset low temperature range, pressurized in a preset low pressure range and kept in this temperature and pressure range for a preset treatment duration. In the course of this, an oxygen-containing gas, e.g. air or oxygen-enriched air or technical grade oxygen is introduced into the medium at least intermittently. The low temperatures and pressures provided in the two process steps are below or at most in the lower third of the temperature and pressure ranges of 150.degree.-370.degree. C. and 10-220 bar conventional in the wet-oxidation processes. Between the first and second process step or during the second process step, a predetermined amount of hydrogen peroxide is added to the medium. By means of this process, a substantial degradation of the chemical oxygen demand (COD) of the medium and a great reduction in volume of the solids content of the medium are achieved.
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