Principal component analysis to assess the efficiency and mechanism for ultraviolet-C/polyaluminum chloride enhanced coagulation of algae-laden water

Hua Se Ou, Chao Hai Wei, Yang Deng, Nai Yun Gao

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

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 languageEnglish
Pages (from-to)493-503
Number of pages11
JournalWater Science and Technology: Water Supply
Volume14
Issue number3
DOIs
StatePublished - 1 Jan 2014

Fingerprint

dissolved organic matter
coagulation
principal component analysis
alga
chloride
water
phosphorus
protein
biomass
factor analysis
dissolved organic carbon
chlorophyll a
wavelength
degradation
pollutant
lake

Keywords

  • Algae
  • CDOM
  • Coagulation
  • PCA
  • Ultraviolet

Cite this

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title = "Principal component analysis to assess the efficiency and mechanism for ultraviolet-C/polyaluminum chloride enhanced coagulation of algae-laden water",
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{\%}).",
keywords = "Algae, CDOM, Coagulation, PCA, Ultraviolet",
author = "Ou, {Hua Se} and Wei, {Chao Hai} and Yang Deng and Gao, {Nai Yun}",
year = "2014",
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language = "English",
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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 journalArticleResearchpeer-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 -