Recent trends in microalgal harvesting: an overview

Laraib, Natasha; Hussain, Ali; Javid, Arshad; Noor, Tahir; Ahmad, Qurat‐ul‐Ain; Chaudhary, Asma; Manzoor, Maleeha; Akmal, Muhammad; Bukhari, Syed Mohsin; Ali, Waqas; Choi, Tae Hee; Schenk, Peer M.

doi:10.1007/s10668-021-01805-2

Cited by 6 publications

(3 citation statements)

References 193 publications

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“…However, microalgae production is not yet economically viable, and one of the main obstacles is the high cost of the microalgae harvesting process, which typically accounts for about 20-30% of the total production cost (Brennan and Owende, 2010). Efficient and lowcost harvesting methods are important research topics to realize large-scale microalgae industrialization (Laraib et al, 2022). Recent advances in microalgae technology have resulted in many efficient harvesting techniques to improve microalgae harvesting.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of by-Product Hydrogen Gas in the Harvesting Process of Dunaliella salina using a Non-Sacrificial Cathode

Purwono,

Hadiyanto,

Christwardana

et al. 2024

J. Presipitasi

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Hydrogen gas is considered a pollution-free fuel in the future. However, the EC process using these non-sacrificial electrodes requires further research especially for the production of dissolved hydrogen gas and the efficiency of microalgae harvesting. The purpose of this study was to investigate the concentration of dissolved hydrogen gas produced from the harvesting process of Dunaliella salina microalgae species using EC and ORP concentrations including pH, harvesting efficiency due to voltage variations and harvesting time using EC with non-sacrificial electrodes. D salina harvesting using EC reactor made of cylindrical borosilicate glass. Spiral-shaped type 304 stainless steel (non-sacrificial) serves as the cathode and solid cylindrically-shaped Fe serves as the anode. The voltage set varies between 16, 18, and 20 Volts, while the electrolysis time is varied between 1.3.5 minutes. The results showed that the highest dissolved hydrogen concentration of 820 ppb (0.820 ppm) produced from the EC process used 18 V for 3 minutes. The volume of gas could not be measured because most of the hydrogen gas was dissolved in the D salina culture, so it was not enough to evaporate within 3 minutes. The maximum ORP concentration of -413 mV resulting from the EC process uses 18 V for 3 minutes. When hydrogen gas is present in a solution, it can decrease the ORP value of the solution. At EC time with non-sacrificial electrodes for 5 minutes managed to harvest D salina 50.79%; 61.90%; 74.60% at voltages of 16 V, 18V, and 20 V respectively.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of by-Product Hydrogen Gas in the Harvesting Process of Dunaliella salina using a Non-Sacrificial Cathode

Purwono,

Hadiyanto,

Christwardana

et al. 2024

J. Presipitasi

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“…At the same time, microalgae can be grown without competing for arable land, and in harsh conditions (e.g., salt water) and recirculating systems as an additional component of the water purification system. Such purification systems (photobioreactors producing microalgae biomass) can be successfully used, for example, during intensive fish farming in recirculating aquaculture systems (RAS) where the water is abundant in nutrients necessary for microalgae [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Flocculation, flotation, sedimentation and electro-flocculation are primary harvesting operations, but display operational issues as the microalgal suspension has a similar density to water, and some of the procedures can be energy intensive. Significant disadvantages also include contamination of the biomass with precipitants [5,10]. The quality of biofuel may also be adversely affected by the use of chemicals, resulting in the need for additional treatment [11].…”

Section: Introductionmentioning

confidence: 99%

The Fouling Effect on Commercial Ceramic Membranes during Filtration of Microalgae Chlorella vulgaris and Monoraphidium contortum

Nędzarek

Mitkowski

2022

Energies

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Although interest in the use of membranes for the concentration of microalgal biomass has steadily been growing, little is known regarding the phenomena of membrane fouling. In addition, more attention has been given to polymeric membranes compared to ceramic membranes, which have a longer life that is associated with a higher resistance to aggressive chemical cleaning. In this study, microfiltration (MF) and ultrafiltration (UF) of two microalgae species, Chlorella vulgaris and Monoraphidium contortum, were carried out using tubular crossflow ceramic membranes. Permeate flux was measured, resistance was calculated, and dissolved organic carbon (DOC) was determined. The flux reduction during the first 10 min of filtration was higher for MF than UF (>70% and <50%), and steady-state permeate fluxes were <5% (for MF) and <25% (for UF) of initial (in m3 m−2 s−1) 6.2 × 10−4 (for MF) and 1.7 × 10−4 (for UF). Total resistances (in m−1) were in the ranges of 4.2–5.4 × 1012 (UF) and 2.6–3.1 × 1012 (MF) for M. contortum and C. vulgaris, respectively. DOC reduction was higher for UF membrane (>80%) than for MF (<66%) and DOC concentrations (mg C L−1) in permeates following MF and UF were about five and two, respectively. In conclusion, we demonstrated: (i) higher irreversible resistance for UF and reversible resistance for MF; (ii) permeate flux higher for UF and for M. contortum; (iii) the significant role of dissolved organic compounds in the formation of reversible resistance for MF and irreversible resistance for UF.

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Harvesting Chlorella vulgaris by electro-flotation with stainless steel cathode and non-sacrificial anode

Zhang

et al. 2022

Bioresource Technology

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Recent trends in microalgal harvesting: an overview

Cited by 6 publications

References 193 publications

Experimental Investigation of by-Product Hydrogen Gas in the Harvesting Process of Dunaliella salina using a Non-Sacrificial Cathode

Experimental Investigation of by-Product Hydrogen Gas in the Harvesting Process of Dunaliella salina using a Non-Sacrificial Cathode

The Fouling Effect on Commercial Ceramic Membranes during Filtration of Microalgae Chlorella vulgaris and Monoraphidium contortum

Harvesting Chlorella vulgaris by electro-flotation with stainless steel cathode and non-sacrificial anode

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