Water Treatment Options for Algal Organic Matter & Cyanotoxin Removal

38 Pages·2017·3.65 MB·English

Water Treatment Options for Algal
Organic Matter & Cyanotoxin Removal
“Alternative water treatment options and
current research at the University of Toledo”
Youngwoo (Young) Seo a; b
Associate Professor
a Department of Civil and Environmental Engineering
b Department of Chemical Engineering, University of Toledo, Mail Stop 307,
3048 Nitschke Hall, Toledo, Ohio 43606, United States
1
Contents
1. Backgrounds
2. Available Technologies
3. Current Research at UT
4. Collaboration Opportunities
5. UT Water Treatment Research Lab
2
Toxic Harmful Algal Bloom (HAB)
 The global occurrence of Harmful Algal bloom (HAB)
Cyanobacteria Strains & Associated Toxins
http://epa.ohio.gov/Portals/28/documents/habs/toxin_producing_cyanobacteria.pdf
Cyanotoxins
 Cyanotoxin classification and their respective mode of
action
Appl Microbiol Biotechnol (2014) 98:8073–8082
Microcystin-LR
Microcystin-LR (MC-LR)
 Produced as secondary metabolites by cyanobacteria
 Stable in water and resistant to Hydrolysis, Oxidation and High Temperature
MC-LR
 Hepatotoxin ( liver damage/ liver tumor promoter )
 Drinking water guidance value by World Health Organization (WHO) : 1 μg/L
6
Ho et al, Water Res 2012,46, (5), 1536-48; Liang et al, J of Hazard Mat 2016,301(15)381–399
Microcystin Incident by State
7
WaterResearchFoundation2014 WRF Webcast
Treatment for Cyanobacteria Toxins
Toxins in Cells Dissolved Toxins
• Particle removal processes are
• Particle removal processes
not effective
• Minimize cell lysis and toxin
• Typical disinfectants may not be
releases
effective
• Major water treatment plant
improvements with high costs
(e.g. ozone and/or GAC)
8
Controlling Methods for Microcystins
KMnO Ozonation UV/H O
2 2
4
Optimization
Membrane Filtration Biological Filtration
9
Potassium Permanganate Optimization
Study Objectives
Algal Organic Matter (AOM)
KMnO Pretreatment
4
 Maximum dose? Drinking Water
 Damage algal cell ?
Treatment Plant
 Release of toxins (microcystin-LR) ?
 Lower DBP precursors?  Taste and odor problems
 Precursors of Disinfect
Byproducts (DBPs)
?
 Algal toxin release