The concentration of suspended solids in an aeration tank is 2500 mg/L. The flow rate from a primary clarifier into the aeration tank is 3,600,000 gpd. The concentration of suspended solids in this flow rate is 2000 mg/L. The aeration tank is also fed with returned activated sludge with a concentration of suspended solids of 9000 mg/L. The flow rate of the returned sludge is most nearly (A) 200,000 gpd (B) 260,000 gpd (C) 280,000 gpd (D) 1,400,000 gpd

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Hazard Analysis and Design in Chemical Engineering

Hazard is the intrinsic property of a material or process which harms the people, buildings, or environment. Health, safety, hazard, risk assessment, loss prevention, and environmental consideration play an important role while designing a chemical processing plant. Hazard is often confused with risk. Risk measures the magnitude of loss and injury of likelihood incidents or the consequence and frequency of incidents.