The Function of the Root Microecosystem in the Process of Dyeing Wastewater Treat ment by the Hyacinth
凤眼莲净化印染废水过程中根系微生态系统的作用

It has been proved that there is a root microecosystem in the process of dyeing wastewater treatment by the hyacinth. With fout days' retention, the percentage of COD removal in the oxidation tank, where the hyacinth was planted and its root sterilized with chloride, was 13%. However the percentage of COD removal in ordinary biological oxidation pond without the hyacinth was 15%. In comparison with this, a water hyacinth oxidation tank without sterilization showed-higher COD removal percentage of 35% due to existence of a root microecosystem. Similar results were obtained when wastewater containing PVC, detergent and some dyes were treated with the three methods mentioned above. Some organic compounds that could scarcely be absorbed by the hyacinth, for example, those easy to be coagulated or floccules, could be sticked and fixed on the root surface, and then degraded by the root microecosystem.