The completely mixed activated-sludge plant is to treat 10000 m³/day of industrial wastewater. The wastewater has BOD5 of 1300mg/1 that must be reduced to 300mg/1 to discharge to a municipal sewer. The secondary clarifier is designed with underflow of 10000mg/1. Pilot-plant analysis indicates that a mean cell-residence time of 5day, MLSS concentration is 5000 mg/1, Y=0.7kg/kg. Kd=0.03d-¹ Determine: 1)treatment efficiency? 2) The volumetric loading? 3) The volume of the reactor?

The completely mixed activated-sludge plant is to treat 10000 m³/day of industrial wastewater. The wastewater has BOD5 of 1300mg/1 that must be reduced to 300mg/1 to discharge to a municipal sewer. The secondary clarifier is designed with underflow of 10000mg/1. Pilot-plant analysis indicates that a mean cell-residence time of 5day, MLSS concentration is 5000 mg/1, Y=0.7kg/kg. Kd=0.03d-¹ Determine: 1)treatment efficiency? 2) The volumetric loading? 3) The volume of the reactor?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

The completely mixed activated-sludge plant is to treat 10000 m³/day of industrial
wastewater. The wastewater has BOD5 of 1300mg/1 that must be reduced to 300mg/1 to
discharge to a municipal sewer. The secondary clarifier is designed with underflow of
10000mg/1. Pilot-plant analysis indicates that a mean cell-residence time of 5day, MLSS
concentration is 5000 mg/1, 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) The sludge recirculation ratio?
6) Average biomass concentration (F/M)?
7) Q wasted from a recycled line?

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