Design of Trickling Filter
1. A tricking filter with the following dimensions is available. Depth: 2 m, Surface area: 150 m2. The media consists of stones of 7-10 cm diameter. This filter will be used to treat 0.6 MLD wastewater with BOD5 = 300 mg/L. The trickling filter will be operated in the high-rate mode, i.e., OLR: 0.48 – 0.96 Kg/m3/d, HLR: 10 – 40 m3/m2/d, re-circulation ratio: 1-2. Based on this information, calculate the expected BOD5 removal efficiency.
2. Determine bulk volume of filter medium for treating 2mld of wastewater flow with following data Inlet BOD5 =300mg/l, Effluent BOD5 =30 mg/l, BOD removal efficiency = 75%, K=0.068m/d, Sp. Surface area = 80 m2/m3
