Harvesting green algae from eutrophic reservoir by electroflocculation and post-use for biodiesel production

Valero, Enrique; Álvarez, Xana; Cancela, Ángeles; Sánchez, Ángel

doi:10.1016/j.biortech.2015.03.138

Cited by 30 publications

(11 citation statements)

References 32 publications

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“…It should be noted that the iron electrode-based ECF process can induce formation of a brown-colored algae-iron slurry [58]. Al 3+ ions from the aluminum electrode can also contaminate the algal biomass and supernatant effluent, which might seriously limit its large-scale application [64,134]. Therefore, there is a need to develop effective strategies to reduce environmental and health toxicity as well as alternative efficient, environmentally-friendly materials to replace the current metal electrodes.…”

Section: Sacrificial Electrodementioning

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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Section: Sacrificial Electrodementioning

confidence: 99%

Flocculation Harvesting Techniques for Microalgae: A Review

et al. 2019

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“…Further treatment of all types of organic pollutants in waste fluid is necessary prior to its reuse or discharge. Electrochemical method is an effective way for processing fracturing flow-back fluid in oilfield [3] and involves electrocoagulation [4][5][6], electrolytic flotation [7][8][9], and electrochemical oxidation methods [10][11][12][13]. These electrochemical methods produce a considerable amount of gases, such as H 2 , O 2 or Cl 2 , in the electrode during the fracturing fluid treatment [14][15].…”

Section: Introductionmentioning

confidence: 99%

Assessment of gas production and electrochemical factors for fracturing flow-back fluid treatment in Guangyuan oilfield

Yang

Chen

Zhang

et al. 2018

Environmental Engineering Research

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Electrochemical method was used for the fracturing flow-back fluid treatment in Guangyuan oilfield. After performing electrolysis, we found that the amount of H2 gas produced by electrode was closely related to the combination mode of electrodes and electrode materials. Using an aluminium electrode resulted in a large H2 production of each electrode combination, whereas inert anode and cathode materials resulted in low H2 production. Then, the relationship between the gas production of H2 and the treatment efficiency of fracturing flow-back fluid in Guangyuan oilfield was studied. Results showed that the turbidity removal and decolourisation rates of fracturing flow-back fluid were high when H2 production was high. If the H2 production of inert electrode was large, the energy consumption of this inert electrode was also high. However, energy consumption when an aluminium anode material was used was lower than that when the inert electrode was used, whereas the corresponding electrode combination production of H2 was larger than that of the inert electrode combination. When the inert electrode was used as anode, the gas production type was mainly O2, and Cl2 was also produced and dissolved in water to form ClO −. H2 production at the cathode was reduced because ClO − obtained electrons.

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“…and there are several methods of separating algae such as salvage, sedimentation, centrifugation, coagulation, flocculation [4,5]. Although conventional methods are still the main treatment process for algae removal, due to the small size and low specific gravity, it is difficult to remove algae effectively [3].…”

Section: Introductionmentioning

confidence: 99%

“…Electro-coagulation-flotation (ECF), which seems to have more attractive than the conventional techniques for the treatment of algae-laden waters, runs greatly low energy consumption and safely [4,6]. Poelman [7] used ECF for microalgae recovery in drinking water treatment indicated removal efficiencies of 95% or more were easily obtained with different microalgae strains, and most important of all, energy consumption was as low as approximately 0.3 kW˙ h˙m -3 .…”

Section: Introductionmentioning

confidence: 99%

“…Poelman [7] used ECF for microalgae recovery in drinking water treatment indicated removal efficiencies of 95% or more were easily obtained with different microalgae strains, and most important of all, energy consumption was as low as approximately 0.3 kW˙ h˙m -3 . Enrique [4] summarized the electro-flocculation, which does not damage the environment, is a suitable method for the eutrophication and the blooms of algae and cyanobacteria taking place in fluvial ecosystems.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Variation of algae scum in electro-coagulation-flotation (ECF) process

Tian¹,

Xu²,

Lu³

et al. 2015

Proceedings of the 3rd International Conference on Advances in Energy and Environmental Science 2015

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Abstract. Algae scum, which is inevitable in the algae water separation process, should be harvested and forbidden to discharge into the water. This paper studied the variation of algae scum in electro-coagulation-flotation (ECF) process. All experiments were conducted in the homemade electro-coagulation-flotation device, and the operating parameters included electric current density and operating time. The results showed that the variation of algae scum is affected by the operating parameters. With increasing of the electric current density and prolongation of the operating time, the moisture content of algae scum decreases gradually. On the contrary, with increasing of the electric current density and prolongation of the operating time, the slag water rate increases gradually. And the values of the moisture content and the slag water rate are relatively lower than other technologies. Overall, the results showed that the electro-coagulation-flotation (ECF) is a well suitable technology for algae water separation.

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Harvesting green algae from eutrophic reservoir by electroflocculation and post-use for biodiesel production

Cited by 30 publications

References 32 publications

Flocculation Harvesting Techniques for Microalgae: A Review

Flocculation Harvesting Techniques for Microalgae: A Review

Assessment of gas production and electrochemical factors for fracturing flow-back fluid treatment in Guangyuan oilfield

Variation of algae scum in electro-coagulation-flotation (ECF) process

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