Assessing Post Treatment DBP (THM) Aeration Variables

40 Pages·2009·2.06 MB·English

Assessing Post-Treatment
Aeration Variables to
Reduce Disinfection Byproducts(THMs)
for Small Systems
Ethan S. Brooke & M.R. Collins
Water Treatment Technology Assistance Center
Civil Engineering
University of New Hampshire
1
What Are Disinfection
Byproducts?
+
=
Free Chlorine Natural Disinfection
(CL) Organic Byproducts
Matter (DBP)
(NOM)
Stand Pipe Aeration
Chlorine Contact Basin Aeration
4
A Potential Solution for Small
Systems
Particularly useful for concurrent

systems
Do not have control over water quality

Alternative to precursor removal /

alternative disinfectant
5
Diffused Surface Spray
Aeration Aeration Aeration
6
Aeration Kinetic Basics
Equilibrium is the driving force for all forms of
Aeration!
7
Equilibrium is Expressed
by Henry’s Constant
8
Factors Affecting
Henry’s Constant
pH
Complex Mixtures: Co-solvents and Co-solutes
Ionic Strength: Dissolved Salts
Suspended Solids
Dissolved Organic Matter
Surfactants
Temperature
9
Henrys Constant Temperature
Correction Equation
10