A completely mixed activated-sludge plant is to treat 7000m³ /day of industrial wastewater. The wastewater has BOD5 of 1200mg/l that must be reduced to 200mg/l to discharge to a municipal sewer. The secondary clarifier is designed with under flow (recycled sludge) of 8000mg/l. Pilot-plant analysis indicates that a mean cell-residence time of 4day, MLSS concentration is 3000 mg/l, Y-0.7kg/kg, Kd=0.03d-¹, determine: 1) Treatment efficiency? 2) The volumetric loading? 3) The volume of the reactor?

A completely mixed activated-sludge plant is to treat 7000m³ /day of industrial wastewater. The wastewater has BOD5 of 1200mg/l that must be reduced to 200mg/l to discharge to a municipal sewer. The secondary clarifier is designed with under flow (recycled sludge) of 8000mg/l. Pilot-plant analysis indicates that a mean cell-residence time of 4day, MLSS concentration is 3000 mg/l, Y-0.7kg/kg, Kd=0.03d-¹, determine: 1) Treatment efficiency? 2) The volumetric loading? 3) The volume of the reactor?

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A completely mixed activated-sludge plant is to treat 7000m³ /day of industrial wastewater. The
wastewater has BOD5 of 1200mg/l that must be reduced to 200mg/l to discharge to a municipal sewer.
The secondary clarifier is designed with under flow (recycled sludge) of 8000mg/l. Pilot-plant analysis
indicates that a mean cell-residence time of 4day, MLSS concentration is 3000 mg/l, Y=0.7kg/kg,
Kd=0.03d-¹, determine:
1) Treatment efficiency?
2) The volumetric loading?
3) The volume of the reactor?
4)
The mass of solids wasted each day (kg/d)?
5) Qe

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