Supplementary information

Effect of pre-ozonation on mitigation of ceramic UF membrane

fouling caused by algal extracellular organic matters

Dequan Wei1,2, Yi Tao1,2 *, Zhenghua Zhang1*, Xihui Zhang1,2

1Tsinghua-Kangda Research Institute of Environmental Nano-Engineering &

Technology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055,

Guangdong, China

2School of Environment, Tsinghua University, Beijing 100084, China

Chemical Engineering Journal

Revised version submitted February, 2016

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*Corresponding author: Tel.:+86-755-26033067; Fax: +86- 755-26036709.

E-mail: zhenghua.zhang@sz.tsinghua.edu.cn (Z.H. Zhang). tao.yi@sz.tsinghua.edu.cn

(Y. Tao). These two corresponding authors contributed equally to this work.

Fig. S1. Schematic diagram of the pre-ozonation set-up.

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dc

ba

Fig. S2. Photographs of ceramic membrane surface (a) and cross-section (b), SEM micrographs of

ceramic membrane surface (c) and cross-section (d).

Fig. S3. EEM spectrum volumes for the EOM of feed and permeate without pre-ozonation (a) and

EOM of feed with pre-ozonation (b). (I Ex/Em = 220-250/280-330 nm; II Ex/Em = 220-250/330-

380 nm; III Ex/Em = 220-250/380-480 nm; IV Ex/Em =250-440/280-380 nm; V Ex/Em = 250-

400/380-540 nm).

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Fig. S4. Fluorescence EEM spectra of raw physical cleaning sample (a), HPO fraction (b), HPI

fraction (c) and TPI fraction (d) of physical cleaning sample. (I Ex/Em = 220-250/280-330 nm; II

Ex/Em = 220-250/330-380 nm; III Ex/Em = 220-250/380-480 nm; IV Ex/Em =250-440/280-380

nm; V Ex/Em = 250-400/380-540 nm).

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Fig. S5. HPSEC-OCD chromatograms of the chemical cleaning sample as a function of pre-

ozonation dosage.

Fig. S6. HPSEC-OCD chromatograms of the physical cleaning sample, HPO, HPI and TPI

fractions of the physical cleaning water sample.

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Table S1

Ingredients of BG-11 medium

Component Concentration (mg/L)

NaNO3 1500

K2HPO4 40

MgSO4·7H2O 75

CaCl2·2H2O 36

Citric acid 6

Ferric ammonium citrate 6

EDTANa2 1

Na2CO3 20

H3BO3 2.86

MnCl2·4H2O 1.86

ZnSO4·7H2O 0.22

Na2MoO4·2H2O 0.02

Co(NO3)2·6H2O 0.05

CuSO4·5H2O 0.08

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Table S2

SSE for the five constant flow combined fouling models fit at different pre-ozonation dosages.

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Ozone dosage

(mg/L)

Cake-complete Cake-intermediate Complete-standard Intermediate-standard Cake-standard

SSE SSE SSE SSE SSE

0 0.0653 0.3456 0.0651 0.1506 0.0368

2 0.0212 0.2404 0.0207 0.1217 0.0066

5 0.0438 0.2120 0.0434 0.1183 0.0248

10 0.0100 0.0626 0.0008 0.0410 0.0010

15 0.0043 0.0044 0.0084 0.0044 0.0041