Study on Biological Aerated Filter (BAF) of Algae-Contained Micropolluted Water
Using NaCl modified zeolite with high specific surface area as filter media, algae-contained micropolluted water was treated with biological aerated filter (BAF) process. The removal efficiencies of the process on micro-pollutants and removal mechanism of algae-contained micropolluted water were investigated and studied. The results showed that better removal efficiency was obtained in turbidity, Chlorophyll-a, UV254, and CODMn when algae-contained micropolluted water was treated by BAF. The optimal process parameters of the treatment of algae-contained micropolluted water with BAF were gases/water ratio of 0.5~2.5, backwash cycle of 3~5 d, air/water backwash strength of 5~7 L/(m2·s), air backwash strength of 13~17 L/(m2·s), backwash time of 15~20min, temperature of 25~30°C, pH value of 7.8~8.5 and hydraulic load of 0.23~0.35 m3/(m2·h). The results of continuous running for 21 days showed that the removal efficiency of turbidity, Chlorophyll-a, UV254, and CODMn were up to 71.61%, 81.35%, 28.34% and 32.97% respectively under the conditions of these optimal parameters, and the effluent water could meet Grade II of the Drinking Water Quality Standards (CJ 3020~1993). This study could provide technical information for town water plant reconstruction of Taihu Lake and Chaohu Lake basin.
W. Y. Zhang et al., "Study on Biological Aerated Filter (BAF) of Algae-Contained Micropolluted Water", Advanced Materials Research, Vol. 340, pp. 311-317, 2012