The MLSS concentration in the aeration tank of extended aeration activated sludge process is 4000 mg//. If one litre of sample settled in 30 minutes and the measuring cylinder showed as sludge volume of 200 ml, then the sludge volume index would be nearly

The MLSS concentration in the aeration tank of extended aeration activated sludge process is 4000 mg//. If one litre of sample settled in 30 minutes and the measuring cylinder showed as sludge volume of 200 ml, then the sludge volume index would be nearly

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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In a BOD test, 5 ml of wastewater (with no dissolved oxygen) is diluted with 295 ml of water containing 8.5 mg/1 of dissolved oxygen. After 5 days incubation at 25°C, the dissolved oxygen content of the mixture is 5 mg/1. Temperature coefficient can be taken as 1.047 and BOD rate constant is 0.23 per day (base e) at 20°C. The ultimate biochemical oxygen demand of the wastewater is
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