Question

The water coming out of the sand filtration system at a plant with Q = 1 MGD contains 100 bacteria/L when it enters the disinfection system. What must the minimum removal rate be in the pseudo-PFR 1000 gal tank to have an effluent concentration of <1 bacteria/L?

Answer #1

6. (1) A water treatment plant applies chlorine for disinfection
so that 10 mg/L chlorine is achieved immediately after mixing. The
volume of water treated each day is 25,000,000 gal. What is the
mass of chlorine needed by this plant every day? (2) The
disinfection takes place in a contact tank which is a CSTR at
steady state. Chlorine concentration in the contact tank is
constant at 3 mg/L. Effluent of this contact tank will enter
drinking water distribution systems...

Problem #3: Biochemical Oxygen Demand (BOD) and Stream
Quality
A wastewater
treatment plant designed for a community of 45,000 people has a
flow of 100 gal/person/day and a BOD5 loading of 0.2
lb/person/day. The upstream characteristics of the receiving waters
are:
stream flow rate =
20 cfs and BOD5 = 2 mg/L
The water quality
standards require the in-stream BOD5 to be less than 7
mg/L in this stretch of the river.
The minimum BOD
removal efficiency that the treatment...

The town of Camp Verde has been directed to upgrade its primary
Waste Water Treatment Plant (WWTP) to a secondary plant that can
meet an effluent standard of 25 mg/L BOD5 and 30 mg/L suspended
solids. They have selected a completely mixed activated sludge
system for the upgrade. The existing primary treatment plant has a
flow rate of 0.029 m3/s. The effluent from the primary tank has a
BOD5 of 240 mg/L. Using the following assumptions, estimate the
required volume...

Question 1
You are assigned to carry out a preliminary design for a water
treatment process. A pollutant of concern, denoted ‘A’, is known to
degrade in water. But you do not know the rate law or reaction rate
constant. You conduct a series of experiments. In each case, you
established an initial concentration of 50 mg/L of pollutant ‘A’ in
water in a sealed vessel. After a certain period, you open the
vessel and measure the remaining concentration of...

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