A control, process for a glass furnace will remove boron from the 1400 oF furnace by cooling the exhaust to 275 oF in an evaporative cooler to condense B2O3. The cooled exhaust will then pass through a ro verse-jet filter to remove suspended dust, including the B2O3 particulates. Draw a preliminary flow sheet for the process, indicating any auxiliary equipment needed, List any operating difficulties you think might arise with this system.

True/False questions. 1 For filtration process: when the water level rises to the point that the filter bed must be cleaned. This point is called terminal head loss ( 2 As the temperature decreases the detention time in 7 slow-mix tank decreases. ( 6 8 When CO₂ is bubbled in water with carbonate buffer system, the pH will decrease slightly and the reaction will shift to the left. ( ) 9 The lower the water turbidity, the higher the allowable ) scour velocity in sedimentation tank.( For mixed-media filter the layer of garnet is used to catch the very fine particles ( 3 The addition of polymers in coagulation process is called inter-particle bridging. ( ) ) 4 Slow-mixing can be accomplished by hydraulic As the weir lengths become shorter the scouring velocity becomes higher ( jump ( ) ) 5 Water with high turbidity requires more coagulant 10 Aluminum sulfate has a wider pH range for effective to be treated. ( coagulation than fèrric salts ( )

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

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Liquid alum is delivered to a water treatment plant which contains 642.3 milligrams of alum per milliliter of liquid solution. Jar tests indicate that the best alum dose is 8 mg/L. Determine the setting on the liquid alum chemical feeder in milliliters per minute when the flow is 2.2 MGD.