| 摘要 |
<p>To improve the clean up efficiency in biological wastewater (effluent) clean up in trickling filter units, it is proposed to enrich the wastewater with technical-grade oxygen prior to entry into the trickling filter 13. Preferably, the technical-grade oxygen is incorporated into the wastewater via perforated gas-introduction tubes 5 in a prepurification vessel 4 upstream of the trickling filter 13. In this manner, toxic wastewater constituents, in particular hydrogen sulphide, can be oxidised even before entry of the wastewater into the trickling filter 13. Thus the risk of some of the biomass colonising the trickling filter 13 dying off because of the pollution of the wastewater with toxic substances is reliably averted. Moreover, odour pollution due to spraying fouled wastewater over the trickling filter packing material 15 by means of a spraying rake 14 is avoided. <IMAGE></p> |
