Evaluation of an electro-flotation-oxidation process for harvesting bio-flocculated algal biomass and simultaneous treatment of residual pollutants in coke wastewater following an algal-bacterial process

Ryu, Byung-Gon; Kim, Jungmin; Han, Jong‐In; Kim, Kyochan; Kim, Dong-Hyun; Seo, Bum-Kyoung; Kang, Chang-Min; Yang, Ji‐Won

doi:10.1016/j.algal.2017.06.012

Cited by 22 publications

(17 citation statements)

References 43 publications

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“…The electroflotation by only hydrogen bubbles of ultrafine silica particles was investigated, achieving recoveries greater than 85% [49]. The feasibility of employing an electroflotation-oxidation process for the harvesting of green microalgae and treatment of residual pollutants in coke effluent was published [50]. Electroflotation, or perhaps correctly, electrolytic flotation (as electricity is used in other flotation techniques, i.e., for the impeller), owes its name to the bubbles generation method it uses: electrolysis of the aqueous medium.…”

Section: Electroflotationmentioning

confidence: 99%

Flotation in Water and Wastewater Treatment

2018

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Flotation constitutes a separation process that originated from mineral processing. Nowadays, wider applications have been found and compared to flotation for water and wastewater treatment. Stress in the present review paper was mainly applied to heavy metal ions recovery by flotation and the respective mechanism followed, being either ion, precipitate, or sorptive flotation. In the latter case, the use of adsorbents is included (such as powdered activated carbon, zeolites, and goethite), as well as various biosorbents. The flotation of the following metals was reviewed: copper, zinc, nickel, lead, iron, chromium, arsenic, gold, and others. The bubble generation method could be applied for typical dispersed-air flotation column, electroflotation, or dissolved-air flotation; the latter being the most appropriate established technique in water treatment. The role of particle size (for example, studying flotation of salt-type mineral fines) was also examined.

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Section: Electroflotationmentioning

confidence: 99%

Flotation in Water and Wastewater Treatment

2018

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“…Electro-flotation harvesting of microalgae has been recently investigated by using electrodes made from various kinds of metals including Fe, Al, Cu, Mg and stainless steel. (Bleeke et al, 2015;Ryu et al, 2018;Ghernaout et al, 2014;Xu et al, 2010;Zenouzi et al, 2013;Shuman et al, 2015;Dassey & Theegala, 2014;Barros et al, 2015). During an application of electrical current, the positive electrodes release metal ions into the medium.…”

Section: Introductionmentioning

confidence: 99%

Electro-flotation harvesting of microalgae using a combination of electrode types

et al. 2019

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This study aimed to search for a proper system for electro-flotation harvesting of microalgae Dunaliella salina with a minimization of metal contamination. An applied electrical current caused cell aggregation and produced small bubbles which levitated cell clusters to the top surface. Since no electrolytic erosion for cathodes (negative electrodes), we tested the harvesting by using planar cathodes, lying in the bottom of the reactor, made from different materials and forms. For a given electrical current, all cathodes resulted in a similar harvesting efficiency as well as the energy consumption. Unlike the cathode, the anode (positive electrodes) usually erodes in the electrolytic process. To avoid contamination of released metal, we used only graphite plates as the anode. Different settings of graphite anode plates (located above the cathode) were studied. For a given electrical current, all cases of anode settings had a similar harvesting efficiency but the energy consumption increased with the distance between the anode and the cathode. For a given setup of electrodes, we showed that both the harvesting efficiency and the energy consumption increased with the applied electrical current. By considering the above results as well as the fact that the stainless steel plate is cheaper and easier to handle in comparison to the graphite plate, we suggest that a combination of graphite anode and stainless steel cathode is an appropriate set for microalgae harvesting with an avoidance of metal contamination. Furthermore, for a convenience of the collection of the levitated microalgae cells, the top surface should be leaved widely opened by setting the graphite anode plates near the wall of the reactor. Finally, a large scale harvesting of the microalgae cultured with outdoor conditions is demonstrated in Nakhon Ratchasima, Thailand.

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“…The high capital cost and energy consumption of microalgae harvesting comes due to the fact that the algae concentration in the solution is very low (1-2 g/l); consequently, a large volume is required. The small size of microalgal cells, most of which are less than 10 μm in diameter, further complicate the separation process [5,6].…”

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confidence: 99%

“…Researchers have adopted various microalgae harvesting techniques that include gravity flotation and flocculation, sedimentation, filtration and screening and centrifugation. However, all of these techniques have disadvantages associated with power consumption and process efficiency that affect the overall economic feasibility of the process [6][7][8][9].…”

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confidence: 99%

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Electrochemical harvesting of microalgae꞉ Parametric and cost-effectivity comparative investigation

Al-Yaqoobi

Al-Rikabey

Al-Mashhadani

2021

CI&CEQ

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The cost of microalgae harvesting constitutes a heavy burden on the commercialization of biofuel production. The present study addressed this problem through economic and parametric comparison of electrochemical harvesting using a sacrificial electrode (aluminum) and nonsacrificial electrode (graphite). The harvesting efficiency, power consumption, and operation cost were collected as objective variables as a function of applied current and initial pH of the solution. The results indicated that high harvesting efficiency obtained by using aluminum anode is achieved in short electrolysis time. That harvesting efficiency can be enhanced by increasing the applied current or the electrolysis time for both electrodes materials, where 98% of harvesting efficiency can be obtained. The results also demonstrated that the power consumption with graphite anode is higher than that of aluminum. However, at 0.2 A the local cost of operation with graphite (0.036US$/m3), which is distinctly lower than that of aluminum (0.08US$/m3). Furthermore, the harvesting efficiency reached its higher value at short electrolysis time at an initial pH of 6 for aluminum, and at an initial pH of 4 for graphite. Consequently, the power consumption of the harvesting process could be reduced at acid- nature conditions to around 0.46KWh/Kg for aluminum and 1.12KWh/Kg for graphite.

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Evaluation of an electro-flotation-oxidation process for harvesting bio-flocculated algal biomass and simultaneous treatment of residual pollutants in coke wastewater following an algal-bacterial process

Cited by 22 publications

References 43 publications

Flotation in Water and Wastewater Treatment

Flotation in Water and Wastewater Treatment

Electro-flotation harvesting of microalgae using a combination of electrode types

Electrochemical harvesting of microalgae꞉ Parametric and cost-effectivity comparative investigation

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