REMEDIATION OF THE POLLUTED LANDSCAPE WATER BY USING THE COMBINED PROCESS OF BIOFILM AND AERATION

In this study, the combined process of biofilm and aeration was applied to treat polluted landscape water. The results of the lab-scale experiments showed that water quality parameters improved remarkably after treatment by the combined method. With the retention time of 8 d, chemical oxygen demand (COD), ammonium nitrogen (NH sub(4)+), total nitrogen (TN) and total phosphorous (TP) were observed to be reduced, with the mean removal efficiency of 53.4%, 85.0%, 24.9% and 37.0%. Accordingly, the mean Oxidation-Reduction Potential (ORP) increased from 130.0 to 182.8 mV, the mean pH decreased from 10.0 to 8.0, and the mean transparency improved from 20 to 90 cm. It was proved that the improvement of polluted water was mainly resulted from the synergistic reaction of the biofilm and aeration. The combined process had the better performance in field-scale experiment. Water quality in the treated area arrived at Degree VI of the State Standard for Surface Water. The results indicate that usefulness of the combined process to remediate polluted landscape water.