Net primary productivity, biofuel production and CO 2 emissions reduction potential of Ulva sp. (Chlorophyta) biomass in a coastal area of the Eastern Mediterranean

Chemodanov, Alexander; Jinjikhashvily, Gabriel; Habiby, Oz; Liberzon, Alex; Israel, Álvaro; Yakhini, Zohar; Golberg, Alexander

doi:10.1016/j.enconman.2017.06.066

Cited by 46 publications

(27 citation statements)

References 75 publications

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“…A positive aspect of detecting new invasives is the opportunity to incorporate them into local industries and aquaculture. Ulva species, including new arrivals, may be valuable for the local bioeconomy (Chemodanov et al, 2017). The results are especially important given the growing interest in using Ulva biomass for various food industries, in bioremediation, or as a source for bioethanol production.…”

Section: Discussionmentioning

confidence: 99%

Native, invasive and cryptogenic Ulva species from the Israeli Mediterranean Sea: risk and potential

et al. 2018

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The genus Ulva (Chlorophyta) is ubiquitous along Israeli Mediterranean shores where it has been studied extensively due to its important ecological role and potential value in biotechnology and aquaculture. Previous identifications of Ulva in Israel were based only on morphology. Here, we compare species found in 2002 and in 2014-2016. Analyses of ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcL) and elongation factor 1-alpha (tufA) plastid genes (2014-2016 samples only), combined with morphological data, identified six Ulva species, three of which are new records for Israel and probably originate from the Indo-Pacific. Ulva compressa, rarely found in 2002, is now the most abundant species and exhibits two fairly distinct morphologies correlated with different haplotypes for both genes. Ulva fasciata was found more commonly in 2002 than in 2014-16, whereas the morphologically similar, and closely related, invasive species U. ohnoi seemed more frequent in recent samples. The finely branched tubular Ulva tepida was found in 2002 and 2015/16, and U. chaugulii and Ulva aragoensis (Bliding) Maggs, comb. nov. were discovered for the first time in 2015/16. The changing Ulva flora of the Israeli Mediterranean may be correlated with major environmental changes including 3°C increase in sea surface temperatures over the last two decades, as well as a generally increasing prevalence of non-native species. The local Ulva species now found in Israel could be of value for various industrial uses.

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Section: Discussionmentioning

confidence: 99%

Native, invasive and cryptogenic Ulva species from the Israeli Mediterranean Sea: risk and potential

et al. 2018

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“…Although, in nature, Ulva grows primarily attached to hard substrates, it is frequently found growing in a floating stage within the water column. Cultivation of free‐floating algal biomass provides an opportunity to use water volumes for cultivation instead of large areas used for attached biomass cultivation, thus reducing the area used for cultivation . To test the potential of tumbling, air mixing, and external water exchange on the intensification of the Ulva sp.…”

Section: Offshore Cultivation In Cages With Tumbling Air Mixing and mentioning

confidence: 99%

“…The green seaweed Ulva sp. was chosen as the model species as it is very common on the shores of Israel and displayed high biomass productivity in extensive cultivation offshore in Israeli waters . Furthermore, the production of proteins and starch, and biomass fermentation to acetone, ethanol, butanol, and polyhydroxyalkanoates from several Ulva species has already been demonstrated …”

Section: Introductionmentioning

confidence: 99%

Feasibility study of Ulva sp. (Chlorophyta) intensive cultivation in a coastal area of the Eastern Mediterranean Sea

Chemodanov

Robin

Jinjikhashvily

et al. 2019

Biofuels Bioprod Bioref

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Increasing biomass production yields is a critical challenge for macroalgae biorefineries. The continuous tumbling and mixing of free‐floating algae through water or airflow has been shown to increase the productivity of algae in land‐based cultivation systems. This approach has not been tested thoroughly in offshore cultivation. We report, here, a field feasibility study on the increase in green macroalga Ulva sp. growth rates in offshore cages, achieved by the combined effect of tumbling and mixing of the algae using influxes of water and air. The experimental system was tested in a shallow coastal area in central Israel, in the eastern Mediterranean Sea. A maximum daily growth rate of 19.2%, areal productivity of 33.72 g dry weight (DW) day−1 m−2, and volumetric yields of 37.78 g DW day−1 m−3, together with 38.47 ± 0.01% ash and 5.28% protein content on a dry matter basis were achieved in the cages with intensified cultivation in the first week of May 2017. Our study shows that cultivation with tumbling and mixing of biomass with air, and water exchange with the environment is a feasible method to increase Ulva sp. biomass productivity offshore. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…The accumulated energy in the biomass during N days was calculated using Equation :

E_{g} true(N_{d a y s} true) = \frac{(F W_{o u t} - F W_{i n}) \cdot c_{p} \cdot D W / F W}{A}

where c p (kJ · g −1 ) is the energy density of the biomass, DW/FW is the ratio of dry weight to wet weight and A (m 2 ) is the illuminated area of the reactor with thalli. In this work we used 11 kJ g −1 for Ulva biomass, as measured in our previous studies (Chemodanov, Jinjikhashvily, et al, ; Chemodanov, Robin, & Golberg, ), A was 0.00432 m 2 . The dry weight of the biomass was measured by drying the biomass at 105 °C for 3 hr.…”

Section: Methodsmentioning

confidence: 99%

Exergy efficiency of light conversion into biomass in the macroalga Ulva sp. (Chlorophyta) cultivated under the pulsed light in a photobioreactor

Habiby

Nahor

Israel

et al. 2018

Biotech & Bioengineering

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Marine macroalgae are a potential feedstock for biorefineries that can reduce dependence on fossil fuels and contribute to bioeconomy. New knowledge and technologies for efficient conversion of solar energy into macroalgae biomass are needed to increase biomass yields and energy conversion efficiency. In this work, we show that the green macroalgae from Ulva sp. can grow under the pulsed light in a photobioreactor with higher exergy conversion efficiency in comparison to cultivation under constant light with the same intensity. In the tested frequencies, 1-40 Hz and duty cycles (DC) 1-100%, DC has a stronger impact on the growth rate than frequency. The efficiency of light transformation into biomass increased with decreasing DC. Pulsating with DC 20% led to 60% of the biomass chemical energy yield for the respective constant light (DC 100%). Models of Ulva sp. growth rate and exergy conversion efficiency as a function of pulsating light parameters were developed. These results open new directions to enhance solar to chemical energy conversion through macroalgae by controlling the light distribution in the macroalgal biomass.

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Net primary productivity, biofuel production and CO 2 emissions reduction potential of Ulva sp. (Chlorophyta) biomass in a coastal area of the Eastern Mediterranean

Cited by 46 publications

References 75 publications

Native, invasive and cryptogenic Ulva species from the Israeli Mediterranean Sea: risk and potential

Native, invasive and cryptogenic Ulva species from the Israeli Mediterranean Sea: risk and potential

Feasibility study of Ulva sp. (Chlorophyta) intensive cultivation in a coastal area of the Eastern Mediterranean Sea

Exergy efficiency of light conversion into biomass in the macroalga Ulva sp. (Chlorophyta) cultivated under the pulsed light in a photobioreactor

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