Environmental Engineering

Use this for “Free chlorine at 1.2 mg/L is held for a t₁₀ of 25 min. What is CT, and does it meet a required CT of 24 mg·min/L?”

Use this for “Put filtration, coagulation, sedimentation, disinfection and flocculation in the order river water meets them.”

Use this for “6 mL of wastewater in a 300 mL bottle drops the DO from 8.8 to 4.3 mg/L in 5 days. What is the BOD₅?”

Use this for “10,000 m³/d at 200 mg/L BOD enters a 3000 m³ tank held at 2500 mg/L MLVSS. What are F/M and the HRT?”

Use this for “Put aeration, grit removal, disinfection, the primary clarifier and bar screens in plant order.”

Use this for “The SO₂ standard is 0.075 ppm. What is it in μg/m³ at 25 °C and 1 atm?”

Use this for “A cyclone catches 90% of the dust and a scrubber after it catches 80% of the rest. Find the overall efficiency.”

Use this for “Waste is 40% paper at 16 MJ/kg, 15% plastic at 33 MJ/kg, 25% food waste at 5 MJ/kg and 20% inert. Find its heating value.”

Use this for “Rank landfilling, recycling, energy recovery and source reduction from most to least preferred.”