(a)OSludge thickening can be implemented using several methods. DescribeTWO(2) differences between gravity thickeners and dissolved air floatation systems.Biotower is an innovative technique from trickling filters. State THREE (3)drawbacks in trickling filters, and explain how each of them were overcomein biotowers.A BOD analysis was conducted on a partially-treated sewage at 25°C. Only20% of the volume of BOD test incubator was filled with the sewage, andthe dissolved oxygen values listed below were measured.Time0123456Dissolved oxygen (mg/L)8.57.76.54.83.5??By considering minimum dissolved oxygen at day 6 is valid for BODtest,determine the following:(i) Reaction rate K25.(ii) 25BOD5 from the drawn graph.(iii) 30BOD3.(iv) COD of the sample.

Sludge can be defined as the residue that is left after the treatment of sewage. Sludge can be…

(a) (b) Sludge thickening can be implemented using several methods. Describe TWO (2) differences between gravity thickeners and dissolved air floatation systems. Biotower is an innovative technique from trickling filters. State THREE (3) drawbacks in trickling filters, and explain how each of them were overcome in biotowers.

(a) (b) Sludge thickening can be implemented using several methods. Describe TWO (2) differences between gravity thickeners and dissolved air floatation systems. Biotower is an innovative technique from trickling filters. State THREE (3) drawbacks in trickling filters, and explain how each of them were overcome in biotowers.

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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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.

Question

(a)
O
Sludge thickening can be implemented using several methods. Describe
TWO
(2) differences between gravity thickeners and dissolved air floatation systems.
Biotower is an innovative technique from trickling filters. State THREE (3)
drawbacks in trickling filters, and explain how each of them were overcome
in biotowers.
A BOD analysis was conducted on a partially-treated sewage at 25°C. Only
20% of the volume of BOD test incubator was filled with the sewage, and
the dissolved oxygen values listed below were measured.
Time
0
1
2
3
4
5
6
Dissolved oxygen (mg/L)
8.5
7.7
6.5
4.8
3.5
?
?
By considering minimum dissolved oxygen at day 6 is valid for BOD
test,determine the following:
(i) Reaction rate K25.
(ii) 25BOD5 from the drawn graph.
(iii) 30BOD3.
(iv) COD of the sample.

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