Take home exam

Take home exam for Wiboonwarn
th

[due date: 26 December 2014]
1) What is the function of polyelectrolyte?
2) In a standard five-day BOD test, why is it usually
necessary to dilute the sample?
3) Explain the process to determine total dissolved solids
from American Society for Testing and Materials (ASTM).
4) Explain and sketch the system of wastewater treatment
plant in your province.
5) Explain the fixed-film reactor.
6) How to remove nitrogen in wastewater?
7) What health concern is causing some municipal water
treatment agencies to convert from chlorine to
chloramines?
8) What is the purpose of an anaerobic digester?
9) State and explain the purpose for which each is used:
a)

O2

b) CO2

c) Ca(OH)2

10) What is the main purpose of tertiary treatment of
wastewater?

11) What are the different processes between water
treatment and wastewater treatment?
12)

What are the key advantages and disadvantages of

using sodium hypochlorite versus chlorine for
disinfection?
13) Name and briefly describe a treatment technology that
is used to remove or transform each of the following
species from wastewater
a)

Pathogens

b) suspended particles > 30 m

14) What specific purpose is ion exchange used in
wastewater treatment?