Changes in biodegradability and molecular weight distribution of NOM under UV/H 2 O 2 treatment
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1 Changes in biodegradability and molecular weight distribution of NOM under UV/H 2 O 2 treatment Mohammad M. Bazri and Madjid Mohseni Chemical and Biological Engineering Department University of British Columbia Vancouver, BC, CANADA IWA NOM Conference, July 2011-Costa Mesa, USA
2 2 Drinking Water UV-H 2 O 2 AOP Commercial drinking water applications Installation UV System Target Pollutant Orange County Water District, CA, TrojanUVPhox NDMA; 1,4-dioxane USA West Basin Municipal Water TrojanUVPhox NDMA District, CA, USA Stockton, CA, USA TrojanUVPhox 1,4-dioxane PWN Treatment Plant Andijk, TrojanUVSwift ECT Pesticides Netherlands City of Cornwall, ON, Canada TrojanUVSwift ECT MIB & geosmin Salt Lake City Department of Public Utilities, UT, USA Rayox TM PCE Sarathy, S.R. and Mohseni, M An overview of UV-based advanced oxidation processes for drinking water treatment. IUVA News. 8(2):
3 Water Quality Solids and suspended particles (turbidity and TSS) Dissolved organics and inorganic matters (NOM, iron, ) block or attenuate UV cause fouling of the quartz and/or UV sensor
4 4 Problems for conventional treatment processes Precursors to chlorination disinfection byproducts ( max TTHMs (80 µg/l ( max HAA5 (60 µg/l Binding of heavy metals and pesticides Bacterial re-growth potential 4
5 5 Problems for Advanced Oxidation Processes Ozone consumption Screening of UV OH scavenging Breaks down into smaller biodegradable compounds 5
6 6 Bacterial re-growth potential Measured as: Assimilable Organic Carbon (AOC) and/or Biodegradable Organic Carbon (BDOC) 6
7 7 Assimilable Organic Carbon (AOC) Biological stability parameter Bacterial regrowth Biofilm formation Public health concerns Undesirable taste & odour Source:
8 8 Objective Investigate the impact of UV/H 2 O 2 on NOM molecular weight and biological stability of water
9 UV/H 2 O 2 experimental setup 9 Low pressure amalgam lamp H 2 O 2 dose: ~ 10 mg/l UV fluence: up to 2000 mj/cm 2
10 10 Water Sources Parameters Capilano Reservoir (CW) Bowen Island (BI) Peachland (PW) Alkalinity (ppm) <5 <15 ~ 50 TOC (ppm) UV 254 (cm -1 ) SUVA (L/mg/m) ~4.2 ~3.75 ~ 4.2 ph
11 11 AOC Measurement via Flow Cytometry Proposed by Hammes & Egli (EAWAG) Relatively rapid & easy (2-3 days) More accurate and reliable Broader perceptive by using indigenous inoculum
12 12 Bottleneck! UV 254 H 2 O 2 2 OH % remains unreacted AOC Analysis Looking for an effective quencher with no detrimental impact on AOC!
13 13 Catalase Immobilization Immobilization on glass beads Immobilization on polymeric support NH 2 -Catalase SEPABEADS EC-EP Epoxide functional group
14 SEPABEAD (SB) Vs. Glassbead (GB) 14
15 15 Impact of UV/H 2 O 2 on physicochemical properties of water
![16 [H 2 O 2 ] 0 ~](/docs-images/84/89345707/images/16-3.jpg "10 ppm TOC UV 254")
16 Impact of UV/H 2 O 2 on CW properties 16 [H 2 O 2 ] 0 ~ 10 ppm TOC UV 254
17 Impact of UV/H 2 O 2 on SUVA % %
18 Impact of UV/H 2 O 2 on AMW of CW NOM 18 Raw CW
19 Impact of UV/H 2 O 2 on AMW of BI NOM 19
20 Impact of UV/H 2 O 2 on AMW of CW NOM 20
21 Impact of UV/H 2 O 2 on AOC of Natural Waters 21 CW TOC ~ 1.4 BI TOC ~ 5
22 BDOC vs. AOC under UV/H 2 O 2 treatment 22 in collaboration with École Polytechnique de Montréal
23 23 Coagulation UV/H 2 O 2 treatment
24 Impact of Alum on TOC - 64% - 51% ppm Alum 5 ppm Alum
25 Impact of Alum on AMW of CW NOM 25
26 Changes in AOC during various Treatments 26 BI water CW water
27 Changes in AOC during various Treatments 27 BI water CW water
28 Highlights Immobilized Catalase on SEPABEAD was used to remove H 2 O 2 NOM molecular weight distribution: Larger organics were mainly targeted under UV/H 2 O 2 Net amount of smaller organic molecules increased Biological Stability: AOC increased 6.6 and 3.36 times for CW and BI respectively Biostability decreased as a result of UV/H 2 O 2 treatment Correlation exists between AOC and BDOC 28
29 Highlights 29 Pretreatment (Coagulation): Alum targeted the medium-large MW organics Reduces AOC in water, however, remainder organics are still potent and further increase was observed under UV/H 2 O 2 Possibility of a post treatment process for UV/H 2 O 2
30 Acknowledgment Drs. Imoberdorf, and Duran (UBC) 30 Drs. Sarathy and Stefan (Trojan Tech. Inc.) Dr. Barbeau's Lab, École Polytechnique de Montréal Natural Science and Engineering Research Council of Canada (NSERC) RES EAU-WaterNet Strategic Network
31 Mohammad Mahdi Bazri Department of Chemical & Biological Engineering University of British Columbia Vancouver, BC, CANADA
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