| 摘要 |
<p>In the present invention there is disclosed a waste water or sewage bio-aeration by making use of two-stage anaerobic-aerobic treatment process of particularly sewage with middle up high biological pollution wit substances. The invented process is characterized in that raw sewage with adjusted acidity is mixed with recycled thickened sludge from the first anaerobic stage (3) together with recycled sludge from the second aerobic stage (5) with subsequent separation of liberated biogas from the activated sludge and preliminary treated water that is then mixed in the second aerobic stage (5) with a recycled thickened activated sludge, with subsequent separation of cleaned water from the activated sludge. The activated sludge one part is then recycled back into the second aerobic stage (5) while the second part thereof is mixed with raw water with adjusted acidity prior entering the first anaerobic stage (3). The apparatus for making the above-described process is formed by a tank (1). In said tank (1) lower section there is arranged inlet (7) of raw sewage being provided with a mixer (8). In the first anaerobic stage (3) upper section there is located a three-phase separator (4) and in the second aerobic stage (5) upper section there is placed a separator (6).</p> |
