Determine the pollutant removal efficiency (%) in an ideal plug flow reactor having hydraulic detention time τ=5hr for a hazardous chemical having a first-order decay rate constant of k=0.40hr−1. Hydraulic detention time = 5 hour

Two circular clarifiers operated in parallel service a single stage bio-tower system (plastic media) that receives municipal wastewater at an average flow (Qaverage) of 2000 m³/d, with BOD5 = 200 mg/L. The internal flow recirculation ratio is 2.4. The maximum overflow rate for the clarifiers is 1.8 m³/m²-hr. The design procedures require that the sizing of the clarifiers be based on "PEAK" flow which is twice the average flow (Qpeak = 2 × Qaverage), and media depth in the biotower is 3.0 m. Determine: (a) The overall BOD5 removal. (b) the surface area and the diameter of each clarifier. (k = 0.06 min¹; n = 0.5),

A water treatment plant is required to process 28800 m³/d or raw water (density = 1000 kg/m³, kinematic viscosity = 106 m²/s). The rapid mixing tank imparts a velocity gradient of 900 s¹ to blend 35 mg/l of alum with the flow for a detention time of 2 minutes. The power input (W) required for rapid mixing is..

Underneath a conventional plug flow reactor and a plug flow reactor with tapered aeration that both use sludge recycle, sketch graphs of DO, DO Uptake, S, and Xa, versus distance from the inlet of the reactor