Optimization Of Biologicially-Enhanced Active Filter Process

Raw water deteriorates gradually so that the traditional process treatment can't guarantee the quality of drinking water, while people's consciousness of safety elevates perpetually. More effective technology is needed in this condition. The normal filtration is improved with Biologically Enhanced Activated Filter (BEAF)by a pilot-scale test and the characteristics is systematically. Elaborated. A BAC-sand and a BAC- Pored-porcelain-ball BEAF are composed. The biofilm form action are studied; different performances under different EBCTs and temperatures are compared; performance recovery after back-washing are analyzed; the treatment principal are studied by operating under the optimal condition; a kinetics model is set up to simulate the course of UV254 removal. The results are: BEAF has higher removal rates than sand filter; by water-dropping aeration, biodegradation works with plenty of DO supply; removal rates of the main pollutants by EBAF grow with the increase of BECT, however, the affect of EBCT trails off when it exceeds 10min; under the optimal EBCT of 10min, removal rates of CODMn, NH4+-N, NO2—N, turbidity and BDOC are above 20%,50%,90%,88% and 60% separately, and AOC can be reduced to below 50μg/L; this technology can reduce THM and the demand of chlorine; air-water backwashing is a better method, and the affect to biomass is evidently related to the removal efficiency. Data prove this technology by biodegradation and normal filtration is effective and economical.