Consider an activated sludge WWTP (wastewater treatment plant). Influent comes in at 28 million L/day, and effluent flows out at 26 million L/day. The recycle flow rate is 30 million L/day. The aeration basin has a volume of 9.0 million liters. The influent and effluent BODS are 450 mg/L and 30mg/L, respectively. The biomass (MLVSS, mixed liquor volatile suspended solids) concentrations in the waste sludge and clarifier effluent are 6,205mg/L and 30mg/L, respectively. Calculate: i. The total biomass discharge rate, kg/day ii. The observed yield iii. The biomass concentration in the aeration tank, mg/L iv. The recycle ratio (Only for this particular question, assume the recycle flow rate as 20) v. The SRT (solids residence time)

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Pavement Drainage holds ample significance, as it prevents the accumulation of water or any liquid on the surface of pavements and ensures proper drainage system. With proper design and gradual slopes provided, the water gets easily removed from the surface into the drains, which are essential during heavy rains and unusual weather conditions keeping it less prone to accidents and increasing the durability of the pavement structure.