Consider the single stage trickling flter plant from the solution in Example 9.1. The use of a single stage fIlter produced a plant effciency of about 75%. To increase plant effIciency, the engineer decides to add an identical second stage fIlter in series to the frst one. The wastewater fLow rate is 2000 m3/d with a BOD5 concentration of 400 mg/L. Primary clarifcation removes 30% of the BOD5. The filters are each 12 m in diameter and 1.5 m in depth. The direct recirculation ratio for each stage is 2.0. Wastewater temperature is 20°C. Calculate the second stage hydraulic loading rate, organic loading rates, effuent BOD5 concentration, and overall plant effIciency. Comment on the advantages/disadvantages of using single stage versus two stage trickling fIlters
Consider the single stage trickling flter plant from the solution
in Example 9.1. The use of a single stage fIlter produced a plant
effciency of about 75%. To increase plant effIciency, the engineer
decides to add an identical second stage fIlter in series to the frst
one. The wastewater fLow rate is 2000 m3/d with a BOD5 concentration of 400 mg/L. Primary clarifcation removes 30% of the BOD5.
The filters are each 12 m in diameter and 1.5 m in depth. The direct
recirculation ratio for each stage is 2.0. Wastewater temperature is
20°C. Calculate the second stage hydraulic loading rate, organic
loading rates, effuent BOD5 concentration, and overall plant effIciency. Comment on the advantages/disadvantages of using single
stage versus two stage trickling fIlters.
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