Determine the size (diameter and depth) of the secondary clarifier (s) in a municipal activated sludge treatment facility: The wastewater characteristics are: Population 250,000, Average per-capita flow rate 380 1/capita-day and Peak factor = 2.2. The suspended solids concentration is assumed to be 2500 mg/L. The over flow rate is 110 and 60 m3/d-m? for peak flow and average flow respectively and solids loading at %3D %3D flow is 110 kg/d-m2. Estimate detention time if the depth is 4.5 m. What would average be the weir loading? Also answer the following questions. (hint : you should use all 3 loading criteria) a. How many kilograms of solids are loaded onto each clarifier per day? b. If the removal efficiency is 65% then how many kilograms of solids are removed from the total flow per day? C. What is the concentration of solids in the wastewater leaving the clarifier? Determine the size (diameter and depth) of the secondary clarifier (s) at a municipal activated sludge treatment facility: The wastewater flow is 25,000 m3/d, the recycle ratio (recycle sludge flow/wastewater flow) is 0.25. The suspended solids concentration is assumed to be 2500 mg/L in the activated sludge tank. The over flow rate is 50 m3/d- m2 and solids loading is 125 kg/d-m2. Estimate detention time if the depth is 4.5 m. What would be the weir loading?
Determine the size (diameter and depth) of the secondary clarifier (s) in a municipal activated sludge treatment facility: The wastewater characteristics are: Population 250,000, Average per-capita flow rate 380 1/capita-day and Peak factor = 2.2. The suspended solids concentration is assumed to be 2500 mg/L. The over flow rate is 110 and 60 m3/d-m? for peak flow and average flow respectively and solids loading at %3D %3D flow is 110 kg/d-m2. Estimate detention time if the depth is 4.5 m. What would average be the weir loading? Also answer the following questions. (hint : you should use all 3 loading criteria) a. How many kilograms of solids are loaded onto each clarifier per day? b. If the removal efficiency is 65% then how many kilograms of solids are removed from the total flow per day? C. What is the concentration of solids in the wastewater leaving the clarifier? Determine the size (diameter and depth) of the secondary clarifier (s) at a municipal activated sludge treatment facility: The wastewater flow is 25,000 m3/d, the recycle ratio (recycle sludge flow/wastewater flow) is 0.25. The suspended solids concentration is assumed to be 2500 mg/L in the activated sludge tank. The over flow rate is 50 m3/d- m2 and solids loading is 125 kg/d-m2. Estimate detention time if the depth is 4.5 m. What would be the weir loading?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Determine the size (diameter and depth) of the secondary clarifier (s) in a municipal
activated sludge treatment facility: The wastewater characteristics are: Population
250,000, Average per-capita flow rate = 380 1/capita-day and Peak factor = 2.2. The
suspended solids concentration is assumed to be 2500 mg/L. The over flow rate is 110
and 60 m3/d-m2 for peak flow and average flow respectively and solids loading at
average flow is 110 kg/d-m2. Estimate detention time if the depth is 4.5 m. What would
be the weir loading? Also answer the following questions. (hint : you should use all 3
loading criteria)
a. How many kilograms of solids are loaded onto each clarifier per day?
b. If the removal efficiency is 65% then how many kilograms of solids are removed
from the total flow per day?
C. What is the concentration of solids in the wastewater leaving the clarifier?
Determine the size (diameter and depth) of the secondary clarifier (s) at a municipal
activated sludge treatment facility: The wastewater flow is 25,000 m3/d, the recycle
ratio (recycle sludge flow/wastewater flow) is 0.25. The suspended solids concentration
is assumed to be 2500 mg/L in the activated sludge tank. The over flow rate is 50 m3/d-
m2 and solids loading is 125 kg/d-m². Estimate detention time if the depth is 4.5 m.
What would be the weir loading?
%3D
%3D
Department of Civil & Environmental Engineering
P.O. Box 519- Mail Stop 2510, Prairie View, Texas 77446
Phone (936) 261-1660/1665(dept)
w.pvamu.edu
Fax (936) 261 1662
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