Abstract
Polyaluminum chloride (PAC) coagulation, short wavelength ultraviolet (UV-C at 254 nm) treatment and UV-C/PAC treatment of algae-laden water from Meiliang Gulf (Lake Taihu) were conducted. The intrinsic characteristics and correlations of chromophoric dissolved organic matter (CDOM), algae biomass and other contaminants were investigated. Parallel factor analysis determined four CDOM components, and principal component analysis (PCA) identified three integrated principal factors. PCA Factor 1 had correlations with dissolved organic carbon (DOC) (r = 0.798), UV254 (0.645), humiclike CDOM component C3 (0.892) and C4 (0.876), and Factor 2 correlated with in vivo chlorophyll-a (0.768), microcystin-LR (0.713), protein-like C1 (0.782) and C2 (0.759). Factor 3 had correlations with NH3-N (0.851) and total phosphorus (T-P) (0.716). The variation in PCA factor scores revealed that single PAC coagulation preferentially removed algal cells (Factor 2) but had little effect on NH3-N and T-P (Factor 3). Single UV-C treatment induced degradation of protein-like CDOM and decrease of algal biomass (Factor 2), followed by humic-like CDOM increase from ruptured cells (Factors 1 and 3). Compared with single PAC coagulation (20 mg L-1), the combined UV-C/PAC treatment (700 mJ cm-2 + 20 mg L-1) enhanced the removal of PCA Factors 1, 2 and 3 (15%, 32% and 10%).
| Original language | English |
|---|---|
| Pages (from-to) | 493-503 |
| Number of pages | 11 |
| Journal | Water Science and Technology: Water Supply |
| Volume | 14 |
| Issue number | 3 |
| DOIs | |
| State | Published - 1 Jan 2014 |
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Keywords
- Algae
- CDOM
- Coagulation
- PCA
- Ultraviolet
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Principal component analysis to assess the efficiency and mechanism for ultraviolet-C/polyaluminum chloride enhanced coagulation of algae-laden water. / Ou, Hua Se; Wei, Chao Hai; Deng, Yang; Gao, Nai Yun.
In: Water Science and Technology: Water Supply, Vol. 14, No. 3, 01.01.2014, p. 493-503.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Principal component analysis to assess the efficiency and mechanism for ultraviolet-C/polyaluminum chloride enhanced coagulation of algae-laden water
AU - Ou, Hua Se
AU - Wei, Chao Hai
AU - Deng, Yang
AU - Gao, Nai Yun
PY - 2014/1/1
Y1 - 2014/1/1
N2 - Polyaluminum chloride (PAC) coagulation, short wavelength ultraviolet (UV-C at 254 nm) treatment and UV-C/PAC treatment of algae-laden water from Meiliang Gulf (Lake Taihu) were conducted. The intrinsic characteristics and correlations of chromophoric dissolved organic matter (CDOM), algae biomass and other contaminants were investigated. Parallel factor analysis determined four CDOM components, and principal component analysis (PCA) identified three integrated principal factors. PCA Factor 1 had correlations with dissolved organic carbon (DOC) (r = 0.798), UV254 (0.645), humiclike CDOM component C3 (0.892) and C4 (0.876), and Factor 2 correlated with in vivo chlorophyll-a (0.768), microcystin-LR (0.713), protein-like C1 (0.782) and C2 (0.759). Factor 3 had correlations with NH3-N (0.851) and total phosphorus (T-P) (0.716). The variation in PCA factor scores revealed that single PAC coagulation preferentially removed algal cells (Factor 2) but had little effect on NH3-N and T-P (Factor 3). Single UV-C treatment induced degradation of protein-like CDOM and decrease of algal biomass (Factor 2), followed by humic-like CDOM increase from ruptured cells (Factors 1 and 3). Compared with single PAC coagulation (20 mg L-1), the combined UV-C/PAC treatment (700 mJ cm-2 + 20 mg L-1) enhanced the removal of PCA Factors 1, 2 and 3 (15%, 32% and 10%).
AB - Polyaluminum chloride (PAC) coagulation, short wavelength ultraviolet (UV-C at 254 nm) treatment and UV-C/PAC treatment of algae-laden water from Meiliang Gulf (Lake Taihu) were conducted. The intrinsic characteristics and correlations of chromophoric dissolved organic matter (CDOM), algae biomass and other contaminants were investigated. Parallel factor analysis determined four CDOM components, and principal component analysis (PCA) identified three integrated principal factors. PCA Factor 1 had correlations with dissolved organic carbon (DOC) (r = 0.798), UV254 (0.645), humiclike CDOM component C3 (0.892) and C4 (0.876), and Factor 2 correlated with in vivo chlorophyll-a (0.768), microcystin-LR (0.713), protein-like C1 (0.782) and C2 (0.759). Factor 3 had correlations with NH3-N (0.851) and total phosphorus (T-P) (0.716). The variation in PCA factor scores revealed that single PAC coagulation preferentially removed algal cells (Factor 2) but had little effect on NH3-N and T-P (Factor 3). Single UV-C treatment induced degradation of protein-like CDOM and decrease of algal biomass (Factor 2), followed by humic-like CDOM increase from ruptured cells (Factors 1 and 3). Compared with single PAC coagulation (20 mg L-1), the combined UV-C/PAC treatment (700 mJ cm-2 + 20 mg L-1) enhanced the removal of PCA Factors 1, 2 and 3 (15%, 32% and 10%).
KW - Algae
KW - CDOM
KW - Coagulation
KW - PCA
KW - Ultraviolet
UR - http://www.scopus.com/inward/record.url?scp=84903156871&partnerID=8YFLogxK
U2 - 10.2166/ws.2013.225
DO - 10.2166/ws.2013.225
M3 - Article
VL - 14
SP - 493
EP - 503
JO - Water Science and Technology: Water Supply
JF - Water Science and Technology: Water Supply
SN - 1606-9749
IS - 3
ER -