| 摘要 |
<p>A method and an apparatus for treatment of aqueous organic waste, especially sewage sludge, is shown comprising the stages of anaerobically digesting the waste in a first stage (1), disintegrating digested waste from the first stage by cell wall destuction (6) and digesting disintegrated waste in a second stage different from the first stage (2). It is characterized in that after disintegrating digested waste and before digesting disintegrated waste in the second stage the disintegrated waste undergoes a liquid-solid-separation in a thickening stage (8). Due to sludge disintegration, e.g. by ozone treatment, the active biomass is disrupted and thus represents a good substrate for digestion. Additionally the sludge settling properties are significantly improved, that is why it is easy thickened by gravity. By having a thickening stage between disintegration stage and second digestion stage the liquor can be recycled (9) to wastewater treatment whereas the solids of the disintegrated waste (10) are subjected to further biodegradation. As a consequence of the phase separation the sludge load to the second stage digestion (2) is reduced as compared to the first stage (1). Thus the organic content in the residual sludge is further reduced. <IMAGE></p> |
