Comparison of Scenedesmus acuminatus and Chlorella vulgaris cultivation in liquid digestates from anaerobic digestion of pulp and paper industry and municipal wastewater treatment sludge

Tao, Ran; Kinnunen, Viljami; Praveenkumar, Ramasamy; Lakaniemi, Aino–Maija; Rintala, Jukka

doi:10.1007/s10811-017-1175-6

Cited by 54 publications

(37 citation statements)

References 60 publications

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“…Due to the lower biomass production and nutrient removal, the growth of C. vulgaris appeared to be more sensitive to cultivation conditions than A. platensis. Similar findings were noted by Tao et al [38], who compared the growth of Chlorella vulgaris and Scenedesmus acuminatus in liquid digestates.…”

Section: Nutrient Removal and Digestate Treatment Efficiencysupporting

confidence: 88%

“…In DLD medium, COD concentration was not as high as in CLD, and interestingly, there was a positive relationship between the initial COD concentration and final biomass production. It could be associated with the presence of microbial communities from inoculum that may enhance the growth of microalgae [38]. Bacterial cultures were introduced into photobioreactors along with the inoculum from a hybrid photobioreactors, where the biomass was cultivated and adapted to anaerobic digestate.…”

Section: Microalgal Growthmentioning

confidence: 99%

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Effects of Liquid Digestate Treatment on Sustainable Microalgae Biomass Production

et al. 2021

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The aim of the study was to investigate the potential of microalgal cultivation on anaerobic liquid digestate as a growth medium. The two methods of liquid digestate treatment including centrifugation and distillation and the two algal strains (Chlorella vulgaris and Arthrospira platensis) were compared. Additionally, the volume of the liquid digestate used to prepare the culture medium constituted from 10 to 50% of the medium volume. The study demonstrated that the highest C. vulgaris and A. platensis biomass productions of 2490 mg TS/L and 2990 mg/L, respectively, were obtained by adding 50% of distilled digestate to a growth medium. Regarding centrifuged liquid digestate, only 10% dilution was required to obtain the maximum final biomass concentration. A. platensis removed 81.1% and 66.4% of the total nitrogen from medium prepared on distilled and centrifuged digestate, respectively, while C. vulgaris ensured 64.1% and 47.1% of removal, respectively. The phosphorus removal from both culture media was higher than 94.2% with A. platensis, while it was 70.4% from distilled and 87.4% from centrifuged media with C. vulgaris. The study confirmed a great potential of microalgal biomass production on anaerobic liquid digestate with a high treatment efficiency of digestate.

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Section: Nutrient Removal and Digestate Treatment Efficiencysupporting

confidence: 88%

Section: Microalgal Growthmentioning

confidence: 99%

Effects of Liquid Digestate Treatment on Sustainable Microalgae Biomass Production

et al. 2021

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“…On the one hand, microalgae uptake CO 2 for their growth. This requirement was calculated taking into account the carbon removal rate, total cultivation area, and CO 2 capture efficiency, which was assumed to be 80% [71,72]. On the other hand, CO 2 is released in the CHP unit.…”

Section: Sustainability Assessmentmentioning

confidence: 99%

Experimental and Techno-Economic Study on the Use of Microalgae for Paper Industry Effluents Remediation

et al. 2021

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Humanity is facing some major global threats, namely lack of environmental sustainability, the energy crisis associated with the unsustainable reliance on fossil fuels, and water scarcity, which will be exacerbated with the rapid growth of urban areas. Researchers have drawn their attention to microalgae, photosynthetic microorganisms known for their environmental applications, such as wastewater remediation and lipids accumulation, to produce third-generation biofuels to solve some of these major issues. Considering this dual role, this study evaluated the potential of the microalga Chlorella vulgaris on nutrient removal from a paper industry effluent and bioenergy production. Firstly, experiments were performed to assess the potential of this microalga to: (i) successfully grow in different concentrations of a paper industry effluent (20% to 100%); and (ii) treat the industrial effluent, reducing phosphorus concentrations to values below the accepted legal limits. Then, a techno-economic assessment was performed to study the viability of a C. vulgaris biorefinery targeting the remediation of a paper industry effluent and bioenergy production. The results have shown that C. vulgaris was able to successfully grow and treat the paper industry effluent. Under these conditions, average biomass productivities determined for this microalga ranged between 15.5 ± 0.5 and 26 ± 1 mg dry weight (DW) L−1 d−1, with maximum biomass concentrations reaching values between 337 ± 9 and 495 ± 25 mg DW L−1 d−1. Moreover, final phosphorus concentrations ranged between 0.12 ± 0.01 and 0.5 ± 0.3 mg P L−1, values below the legal limits imposed by the Portuguese Environment Agency on the paper industry. Regarding the proposal of a microalgal biorefinery for the bioremediation of paper industry effluents with bioenergy production, the techno-economic study demonstrated that six of the seven studied scenarios resulted in an economically-viable infrastructure. The highest net present value (15.4 million euros) and lowest discounted payback period (13 years) were determined for Scenario 3, which assumed a photosynthetic efficiency of 3%, a lipids extraction efficiency of 75%, and an anaerobic digestion efficiency of 45%. Therefore, it was possible to conclude that besides being economically viable, the proposed biorefinery presents several environmental benefits: (i) the remediation of an industrial effluent; (ii) CO2 uptake for microalgal growth, which contributes to a reduction in greenhouse gases emissions; (iii) production of clean and renewable energy; (iv) soil regeneration; and (v) promotion of a circular economy.

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“…Biochemical compounds of each polyculture species for estimating biocrude oil yield was taken from literatures. All polyculture species have a nearly similar composition with 34-49.5% lipids, 36.3-41.5% carbohydrates, and 14.2-27.5% proteins (Supplementary material Appendix 2) [33][34][35][36]. These three components are considered as biocrude oil resources for estimating biofuel yield.Therefore, an insignificant quantity of other compounds, such as RNA/DNA material, is negligible.…”

mentioning

confidence: 99%

A Novel Polyculture Growth Model of Native Microalgal Communities to Estimate Biomass Productivity for Biofuel Production

Rani

Supriyanto

Watanabe

et al. 2021

Biotechnol Progress

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Native polyculture microalgae is a promising scheme to produce microalgal biomass as biofuel feedstock in an open raceway pond. However, predicting biomass productivity of native polycultures microalgae is incredibly complicated. Therefore, developing polyculture growth model to forecast biomass yield is indispensable for commercial-scale production. This research aims to develop a polyculture growth model for native microalgal communities in the Minamisoma algae plant and to estimate biomass and biocrude oil productivity in a semicontinuous open raceway pond.The model was built based on monoculture growth of polyculture species and it is later formulated using species growth, polyculture factor (k value ), initial concentration, light intensity, and temperature. In order to calculate species growth, a simplified Monod model was applied. In the simulation, 115 samples of the 2014-2015 field dataset were used for model training, and 70 samples of the 2017 field dataset were used for model validation. The model simulation on biomass concentration showed that the polyculture growth model with k value had a root-mean-square error of 0.12, whereas model validation provided a better result with a root-mean-square error of 0.08. Biomass productivity forecast showed maximum productivity of 18.87 g/m 2 /d in June with an annual average of 13.59 g/m 2 /d. Biocrude oil yield forecast indicated that hydrothermal liquefaction process was more suitable with a maximum productivity of 0.59 g/m 2 /d compared with solvent extraction which was only 0.19 g/m 2 /d.With satisfactory root-mean-square errors less than 0.3, this polyculture growth model can be applied to forecast the productivity of native microalgae.

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Comparison of Scenedesmus acuminatus and Chlorella vulgaris cultivation in liquid digestates from anaerobic digestion of pulp and paper industry and municipal wastewater treatment sludge

Cited by 54 publications

References 60 publications

Effects of Liquid Digestate Treatment on Sustainable Microalgae Biomass Production

Effects of Liquid Digestate Treatment on Sustainable Microalgae Biomass Production

Experimental and Techno-Economic Study on the Use of Microalgae for Paper Industry Effluents Remediation

A Novel Polyculture Growth Model of Native Microalgal Communities to Estimate Biomass Productivity for Biofuel Production

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