Patents: SA Patent 92/9644
ARIPO Patent AP329
Australian Patent 655388
Israeli Patent 104032
Mexican Patent 206167
Namibian Patent 92/0121
Spanish Patent 2068750
US Patent 5246585

Inventor: Pieter Gerhard Jacobus Meiring

This invention relates to a wastewater treatment process. The process involves passing wastewater through an anaerobic reaction zone so that the organic matter in the wastewater is subjected to anaerobic biological degradation. The wastewater is then passed through an aerobic reaction zone in which the organic matter is subjected to aerobic biochemical breakdown. A wastewater side stream is withdrawn downstream of the anaerobic reaction zone and upstream of the aerobic reaction zone, and passed through a facultative oxidation zone wherein organic matter therein is subjected to aerobic biochemical breakdown. At least a portion of the side stream is passed directly to the aerobic reaction zone. Optionally a portion of the side stream can be returned to anaerobic reaction zone.