Effect of PAC addition on immersed ultrafiltration for the treatment of algal-rich water

Zhang, Yan; Tian, Jiayu; Nan, Jun; Gao, Shanshan; Liang, Heng; Wang, Meilian

doi:10.1016/j.jhazmat.2010.12.015

Cited by 82 publications

(18 citation statements)

References 51 publications

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“…As expected from Figures 2 and 3, a same evolution of AOM characteristics can be observed for the two species. In accordance with Henderson et al [7], Li et al [8] and Zhang et al [9], AOM produced by both the alga and the cyanobacteria was mainly hydrophilic during the lag and exponential phases with 70 to 80% of HPI. HPI is thus mainly produced by metabolic activity because mortality is low during these two phases.…”

Section: Evolution Of Aom Fractionationsupporting

confidence: 85%

“…These studies were limited to the exponential and stationary growth phases and the results obtained depended on the growth conditions (culture medium or light intensity), the considered growth phase and the cultivated species. However, whatever the experimental conditions, the produced organic matter was mainly composed of hydrophilic compounds, this fraction representing 57 to 71% of the AOM (Henderson et al [7], Li et al [8], Zhang et al [9]). Nowadays, few studies deal with the fate of AOM after bloom has collapsed and the impacts of AOM inputs on NOM characteristics in the long term still needs to be determined.…”

Section: Introductionmentioning

confidence: 99%

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Eutrophication impacts on characteristics of natural organic matter: a laboratory approach based onEuglena gracilisandMicrocystis aeruginosacultivation

Leloup¹,

Nicolau²,

Pallier³

et al. 2013

Water Resources Management VII

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Surface water resources can be largely impacted by recurrent seasonal bloom phenomena of algae and cyanobacteria. Algal Organic Matter (AOM) generated presents different composition and properties from that of Natural Organic Matter (NOM). The objective of this work was thus to characterize AOM generated by an alga, Euglena gracilis, and a cyanobacteria, Microcystis aeruginosa, and to evaluate its impacts on NOM during and after eutrophication. The alga and the cyanobacteria were cultivated in laboratory experiments and the evolution of AOM characteristics during the different growth phases were assessed by organic matter fractionation according to hydrophobicity and Specific UV Absorbance (SUVA) determination. The AOM characteristics were then compared to those of NOM from both an eutrophic pond and a river. The AOM characteristics were both algal species and growth phase dependent. During lag and exponential phases, AOM was hydrophilic and mainly produced by metabolic activity. During stationary and decline phases, the percentages of hydrophobic and transphilic compounds progressively increased because of cell mortality. In natural water, the percentage of hydrophilic compounds reached 10-30% of the DOM. In this study this percentage reached more than 50% for AOM during the decline phase for both species and 45% for NOM of an eutrophic pond during summer, when phytoplanktonic contribution was maximum. The fractionation of OM according to hydrophobicity can thus be used to identify and differentiate the eutrophication origin of OM.

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Section: Evolution Of Aom Fractionationsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Eutrophication impacts on characteristics of natural organic matter: a laboratory approach based onEuglena gracilisandMicrocystis aeruginosacultivation

Leloup¹,

Nicolau²,

Pallier³

et al. 2013

Water Resources Management VII

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show abstract

“…The use of coagulation pretreatment is effective for reducing macromolecular organics but is ineffective for removing small molecular organics [15]. Powered active carbon (PAC) can efficiently remove low molecular AOM, but a high dose of PAC may be required [16,17]. Chemical pretreatment was investigated to reduce membrane fouling caused by algae.…”

Section: Introductionmentioning

confidence: 99%

A membrane combined process to cope with algae blooms in water

et al. 2015

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“…For MF/UF systems, the range in algal cell removal efficiencies was also summarized from pilot and full-scale SWRO plant studies [38,[43][44][45][46]. Uniform probability distributions were used in the pMFA model for MF/UF systems considering the small number of reported observations from the literature ( Table 2).…”

Section: Intracellular and Dissolved Toxin Removal Efficienciesmentioning

confidence: 99%

Investigation of Algal Biotoxin Removal during SWRO Desalination through a Materials Flow Analysis

Manheim

Jiang

2017

Water

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Abstract:The operation of seawater reverse osmosis (SWRO) desalination facilities has become challenged by the increasing frequency and severity of harmful algal blooms (HABs). The efficiency of algal toxins removal during SWRO and pretreatment processes has critical human health implications. Therefore, a probabilistic materials flow analysis (pMFA) was developed to predict the removal of algal toxins in source water by various pretreatment configurations and operations during SWRO desalination. The results demonstrated that an appreciable quantity of toxins exists in the SWRO permeate (ng/L-µg/L levels), the backwash of pretreatment, and final brine rejects (µg/L-mg/L levels). Varying the pretreatment train configuration resulted in statistically significant differences in toxin removals, where higher removal efficiencies were evidenced in systems employing microfiltration/ultrafiltration (MF/UF) over granular media filtration (GMF). However, this performance depended on operational practices including coagulant addition and transmembrane pressures of MF/UF systems. Acute human health risks during lifetime exposure to algal toxins from ingestion of desalinated water were benign, with margins of safety ranging from 100 to 4000. This study highlights the importance of pretreatment steps during SWRO operation in the removal of algal toxins for managing marine HABs.

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Effect of PAC addition on immersed ultrafiltration for the treatment of algal-rich water

Cited by 82 publications

References 51 publications

Eutrophication impacts on characteristics of natural organic matter: a laboratory approach based onEuglena gracilisandMicrocystis aeruginosacultivation

Eutrophication impacts on characteristics of natural organic matter: a laboratory approach based onEuglena gracilisandMicrocystis aeruginosacultivation

A membrane combined process to cope with algae blooms in water

Investigation of Algal Biotoxin Removal during SWRO Desalination through a Materials Flow Analysis

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