| Patent Number |
Title Of Patent |
Date Issued |
| 5075007 |
Biological wastewater purification with a downstream precipitation stage |
December 24, 1991 |
| Wastewater containing impurities refractory to secondary treatment is first introducted into an aerobic biological treatment stage operating with an oxygen-enriched stream and subsequently into a precipitation stage where the biologically treated wastewater is combined with Ca(OH).sub.2 |
| 4664804 |
Process for the removal of heavy metals contained in wastewaters |
May 12, 1987 |
| A process is provided for the removal of heavy metals from wastewater prior to being fed to a wastewater treatment installation, with anaerobic sludge to cause the anaerobic sludge to absorb heavy metals in the wastewater. Thus, the heavy metals depleted wastewaters can then be treated i |
| 4627917 |
Process for the anaerobic decomposition of organic substrate |
December 9, 1986 |
| This invention relates to a process and device for anaerobic decomposition of organic substrate in which organic substrate to be treated is passed in a downflow mode through a reactor (1) having a filter bed therein as a carrier for settling microorganisms. The substrate treated in filte |
| 4559142 |
Split feed for the anaerobic biological purification of wastewater |
December 17, 1985 |
| In the anaerobic biological purification of wastewater containing organic substances, some of which have a low rate of metabolism in anaerobic microorganisms, e.g., undissolved and/or partly macromolecular substances, the low-rate substances are separated from the wastewater into a secon |
| 4551250 |
Process for the anaerobic biological purification of wastewater |
November 5, 1985 |
| In a process for the anaerobic biological purification of wastewater containing organic pollutants, the wastewater to be purified is conducted through two series-connected reactors (2 and 5) operated under anaerobic conditions. In order to achieve a shortening of the residence time for t |
