| 摘要 |
<p>A partial flow (12) of sludge is returned to the water (1a) upstream from the bioreactor (2, 3), and the pH regulator (7) used contains aluminium, so that the microorganism culture in the bioreactor is stabilised and the growth of thread bacteria in the flow of purified water is prevented. A process for the biological purification of effluent water (1a-1d) comprises passing the water through at least one bioreactor and at least one biosludge separator (4) further downstream. The bioreactor comprises a number of biofilm carriers (5a, 5b, 6a, 6b) with a large specific surface area for supporting a microorganism culture used for the treatment of the water. A pH regulator is added to the water upstream from the bioreactor and the biofilm carriers are suspended in the water inside the bioreactor during treatment, using an oxygen-containing gas (8). Treated water from the bioreactor is supplied to the biosludge separator, where the sludge generated by the microorganisms is removed. From the separator purified water is supplied to a vessel (9) and a flow of sludge (10-12) is removed. A partial flow (12) of sludge is returned to the water (1a) upstream from the bioreactor and the pH regulator used contains aluminium, so that the microorganism culture in the bioreactor is stabilised and the growth of thread bacteria in the flow of purified water is prevented.</p> |
