1. It is desired to design a bromide chloride contact tank to be used to disinfect a secondary-treated sewage discharge. To determine the contact time, an experiment was conducted producing the following results: HCI Dosage (mg/L) Contact time (min) residual fecal coliform (No/100 mL) 15 30 60 4.7 20,000 5,000 600 23.0 950 530 320 51 380 180 85 Determine the equation of contact time & concentration to be used in design, if it is desired to have a log 3 removal efficiency for fecal coliforms. The original concentration of fecal coliforms is 50,000 per/100 mL.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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1. It is desired to design a bromide chloride contact tank to be used to disinfect a secondary-treated sewage
discharge. To determine the contact time, an experiment was conducted producing the following results:
HCI Dosage
Contact time (min) residual fecal coliform (No/100 mL)
(mg/L)
15
30
60
4.7
20,000
5,000
600
23.0
950
530
320
380
180
85
Determine the equation of contact time & concentration to be used in design, if it is desired to have a log
3 removal efficiency for fecal coliforms. The original concentration of fecal coliforms is 50,000 per/100
mL.
425
Transcribed Image Text:1. It is desired to design a bromide chloride contact tank to be used to disinfect a secondary-treated sewage discharge. To determine the contact time, an experiment was conducted producing the following results: HCI Dosage Contact time (min) residual fecal coliform (No/100 mL) (mg/L) 15 30 60 4.7 20,000 5,000 600 23.0 950 530 320 380 180 85 Determine the equation of contact time & concentration to be used in design, if it is desired to have a log 3 removal efficiency for fecal coliforms. The original concentration of fecal coliforms is 50,000 per/100 mL. 425
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