Abstract
Effects of COD loading and temperature on COD removal rate, sludge growth, nitrification and nitrogen removal rate in the aerobic submerged loop fiber biological contactor which is twisted round aluminous wire were investigated, operating the pilot plants applied to synthetic organic wastewater.
COD loading change in the range of 0.22 to 0.85 g COD ·l-1·d-1 has no effect on soluble COD removal rate, but total COD removal rate decreases a little at the higher COD loading because of an increase of suspended solids. Variation of COD concentration of influent has no effect on effluent COD concentration. Sludge growth weight is proportional to COD loading, regardless of continuous and intermittent feeding process. Nitrification does not proceed in the case that COD loading is over 0.48 g COD ·l-1·d-1. And in the intermittent feeding process nitrification proceeds in the aeration period and nitrogen removal is performed in the feeding period.
Compared with operations at 25°C, 16°C, and 9°C, COD removal rate is a little higher in the lower temperature, and Fungi grow under 20°C. But temperature does not influence on nitrification in the case that nitrification has been fixed.
