Hydrogen recovery from the photovoltaic electroflocculation-flotation process for harvesting Chlorella pyrenoidosa microalgae

Rahmani, Abdellatif; Zerrouki, Djamal; Djafer, Lahcène; Ayral, A.

doi:10.1016/j.ijhydene.2017.06.123

Cited by 29 publications

(8 citation statements)

References 24 publications

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“…Electricity consumption was close to the values found by Chavalparit and Ongwandee (2009); Meneses et al, (2012) and Fernandes et al, (2015), who obtained respectively: 5.57 kWhm -3 , 0.65-2.33 kWhm -3 , 2.07 kWhm -3 , in the treatment of biodiesel wastewater. Energy costs can be minimized by optimizing this reactor, adding, for example, renewable energy generators, such as photovoltaic or wind systems (Rahmani et al, 2017).…”

Section: The Energy Consumed By the Ef Reactormentioning

confidence: 99%

Performance of a two Chambers Reactor for the Treatment of an Oily Effluent by Electro flocculation

Fernandes¹,

Alexandre²,

Saturno³

et al. 2021

IJAEMS

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This work had as objective the development and analysis of a continuum flow reactor and measure its efficiency in the treatment of residual water of the biodiesel purification process using electro flocculation. The reactor was designed with two interconnected chambers with an 0.2 cm opening between then and reaction volume was 0.883 L and an electrolytic area of 351 cm². The electrodes were all aluminum, which were arranged in parallel and with 0.5 cm spacing, whose power was supplied by a DC source. As design variables, the influence of electrical potential (U) and residence time (τ) on: current density, final pH, removal of oils and greases, COD (Chemical Oxygen Demand), turbidity and total solids, in addition to quantification of the sludge mass obtained and the energy cost of the reactor. The best performance was for a potential of 6.0 volts and a τ of 29.43 min, with 90% removal of oils and greases, 53% COD and 4.38 g of sludge, culminating in an energy consumption ranging from 0.708 kWhm -3 to 4.73 kWhm -3 . In addition, by visual analysis of the formation of bubbles and the removal of turbidity (94%), it was concluded that the division of the reactor in two chambers reduced the secondary contamination of the treated effluent.

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Section: The Energy Consumed By the Ef Reactormentioning

confidence: 99%

Performance of a two Chambers Reactor for the Treatment of an Oily Effluent by Electro flocculation

Fernandes¹,

Alexandre²,

Saturno³

et al. 2021

IJAEMS

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“…The electrodes are the major site of reactions and can be classified as either anode, where oxidation reactions occur, or cathode, where reduction reactions occur as shown in Figure 2. It is, thus, important that the selected electrode is effective and cheap [81]. Diverse materials such as aluminum (Al), iron (Fe), zinc (Zn), copper (Cu) as anodes and stainless steel, carbon/graphite (C), titanium (Ti) alloys like iridium oxide/titanium dioxide (IrO 2 /TiO 2 ), titanium/iridium oxide (Ti/IrO 2 ), and titanium/rubidium oxide (Ti/RbO 2 ) as cathodes have been used and each affected bubble characteristics and the performance of the electroflotation process differently as mentioned in Table 6.…”

Section: Electrode Characteristicsmentioning

confidence: 99%

Microalgal Biomass Generation via Electroflotation: A Cost-Effective Dewatering Technology

et al. 2020

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Microalgae are an excellent source of bioactive compounds for the production of a wide range of vital consumer products in the biofuel, pharmaceutical, food, cosmetics, and agricultural industries, in addition to huge upstream benefits relating to carbon dioxide biosequestration and wastewater treatment. However, energy-efficient, cost-effective, and scalable microalgal technologies for commercial-scale applications are limited, and this has significantly impacted the full-scale implementation of microalgal biosystems for bioproduct development, phycoremediation, and biorefinery applications. Microalgae culture dewatering continues to be a major challenge to large-scale biomass generation, and this is primarily due to the low cell densities of microalgal cultures and the small hydrodynamic size of microalgal cells. With such biophysical characteristics, energy-intensive solid–liquid separation processes such as centrifugation and filtration are generally used for continuous generation of biomass in large-scale settings, making dewatering a major contributor to the microalgae bioprocess economics. This article analyzes the potential of electroflotation as a cost-effective dewatering process that can be integrated into microalgae bioprocesses for continuous biomass production. Electroflotation hinges on the generation of fine bubbles at the surface of an electrode system to entrain microalgal particulates to the surface. A modification of electroflotation, which combines electrocoagulation to catalyze the coalescence of microalgae cells before gaseous entrainment, is also discussed. A technoeconomic appraisal of the prospects of electroflotation compared with other dewatering technologies is presented.

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“…The use of a sacrificial metal anode (usually iron and aluminum, or possibly magnesium, copper, zinc or brass) in an electrochemical system causes the release of positively charged metal cations. These dissolved metal cations are able to electrostatically attract negatively charged algal cells, resulting in flocculation [84,126]. It should be noted that ECF processes do not produce counter ions such as chloride and sulfate (generally observed in the conventional chemical flocculation processes), since metal salts are not added here.…”

Section: Sacrificial Electrodementioning

confidence: 99%

“…It should be noted that, in the cases of conventional air-pressure flotation processes, the gas bubbles generated are of comparatively large size and lack good distribution [137]. Rahmani et al [126] developed an integrated photovoltaic electro-flotation system utilizing various electrode materials such as aluminum, iron, zinc, copper, and carbon for harvesting of C. pyrenoidosa. They reported that the aluminum electrode exhibited highest harvesting efficiency of over 95%, compared with the other types of electrode (efficiency order: Zn > 93%, Cu > 83%, C = 79%, Fe > 70%).…”

Section: Electro-flotationmentioning

confidence: 99%

Flocculation Harvesting Techniques for Microalgae: A Review

et al. 2019

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Microalgae have been considered as one of the most promising biomass feedstocks for various industrial applications such as biofuels, animal/aquaculture feeds, food supplements, nutraceuticals, and pharmaceuticals. Several biotechnological challenges associated with algae cultivation, including the small size and negative surface charge of algal cells as well as the dilution of its cultures, need to be circumvented, which increases the cost and labor. Therefore, efficient biomass recovery or harvesting of diverse algal species represents a critical bottleneck for large-scale algal biorefinery process. Among different algae harvesting techniques (e.g., centrifugation, gravity sedimentation, screening, filtration, and air flotation), the flocculation-based processes have acquired much attention due to their promising efficiency and scalability. This review covers the basics and recent research trends of various flocculation techniques, such as auto-flocculation, bio-flocculation, chemical flocculation, particle-based flocculation, and electrochemical flocculation, and also discusses their advantages and disadvantages. The challenges and prospects for the development of eco-friendly and economical algae harvesting processes have also been outlined here.

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Hydrogen recovery from the photovoltaic electroflocculation-flotation process for harvesting Chlorella pyrenoidosa microalgae

Cited by 29 publications

References 24 publications

Performance of a two Chambers Reactor for the Treatment of an Oily Effluent by Electro flocculation

Performance of a two Chambers Reactor for the Treatment of an Oily Effluent by Electro flocculation

Microalgal Biomass Generation via Electroflotation: A Cost-Effective Dewatering Technology

Flocculation Harvesting Techniques for Microalgae: A Review

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