Effects of shear on two microalgae species. Contribution of pumps and valves in tangential flow filtration systems

Vandanjon, Laurent; Rossignol, N.; Jaouen, Pascal; Robert, Jean‐Michel; Quéméneur, F.

doi:10.1002/(sici)1097-0290(19990405)63:1<1::aid-bit1>3.0.co;2-k

Cited by 71 publications

(15 citation statements)

References 12 publications

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“…A suggestion was made that diatoms may be especially sensitive to shear stress because of their rigid silica walls [152]; however, the particular species used in this study was predominantly unsilicified. Another study examined the passage of two diatom species through pumps and valves and concluded that the extent of cellular damage was related to operational parameters, such as Review Hildebrand, Davis, Smith, Traller & Abbriano the pressure drop and the rotational speed of the pump [153]. Cultivation in our laboratory has revealed that some species are impervious to highly turbulent mixing, whereas others are sensitive to modest agitation, suggesting that species-specific differences need to be taken into account with regard to shear stress; such differences have also been reported in the literature [150,154].…”

Section: Settling Rates Flocculation Harvesting and Shear Stressmentioning

confidence: 99%

The place of diatoms in the biofuels industry

et al. 2012

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Section: Settling Rates Flocculation Harvesting and Shear Stressmentioning

confidence: 99%

The place of diatoms in the biofuels industry

et al. 2012

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“…Damage because of shear stress has been demonstrated both in bubble columns due to gas sparging [10–14] and in tubular PBRs due to pumping action [12, 15, 16]. Although cases of shear damage were described, shear stress was only quantified indirectly by using the liquid flow rate or the number and frequency of pump passages.…”

Section: Introductionmentioning

confidence: 99%

Effects of shear stress on the microalgae Chaetoceros muelleri

Michels

Goot

Norsker

et al. 2010

Bioprocess Biosyst Eng

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The effect of shear stress on the viability of Chaetoceros muelleri was studied using a combination of a rheometer and dedicated shearing devices. Different levels of shear stress were applied by varying the shear rates and the medium viscosities. It was possible to quantify the effect of shear stress over a wide range, whilst preserving laminar flow conditions through the use of a thickening agent. The threshold value at which the viability of algae was negatively influenced was between 1 and 1.3 Pa. Beyond the threshold value the viability decreased suddenly to values between 52 and 66%. The effect of shear stress was almost time independent compared to normal microalgae cultivation times. The main shear stress effect was obtained within 1 min, with a secondary effect of up to 8 min.

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“…The algal cell breakage fractions were informed estimates made by extrapolating experimental data summarized in Voutchkov [12]. However, algal cell breakage behavior is influenced not only by operational practices (shear in pumps or valves, transmembrane pressure), but also algal cell type and species (diatom or dinoflagellates) and other biotic factors such as cell age [71][72][73][74][75][76][77]. We reduced this high uncertainty in our model by structuring the distribution of breakage coefficients to encompass a relatively large range, and by incorporating uniform probability distributions for selecting breakage coefficients during each simulation.…”

Section: Uncertainty and Variabilitymentioning

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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Effects of shear on two microalgae species. Contribution of pumps and valves in tangential flow filtration systems

Cited by 71 publications

References 12 publications

The place of diatoms in the biofuels industry

The place of diatoms in the biofuels industry

Effects of shear stress on the microalgae Chaetoceros muelleri

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

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