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EFFECT OF WATER DEPTH AND AERATION ON A CONTACT MEDIA CHANNEL PURIFICATION PROCESS FOR WASTEWATER RECLAMATION

In this study, contact media channel purification process (CMCP) filled with honeycomb media was adopted to implement continuous flow experiments when aeration and water depth varied. The water depth was set at 0.2, 0.5 and 0.8 m, respectively. Three aeration values including 30, 50 and 70 m h -1 were operated at each water depth. The results indicated that the removal efficiencies of total chemical oxygen demand (COD), soluble COD, biochemical oxygen demand (BOD), suspended solids (SS), total nitrogen (TN), total Kjeldahl nitrogen (TKN), ammonia were highly correlated with aeration. The removal efficiencies of BOD, SS, TN, TKN and NH4 + were highly correlated with water depth. When water depth increased from 0.2 to 0.8 m, their removal efficiencies increased remarkably. All effluent quality investigated in this study at the water depth of 0.8 m met the Soil Treatment Standards. Since the groundwater shortage and pollution are severe in Taiwan, the effluent from this CMCP could be used for groundwater recharge.