Phycoremediation of sewage wastewater and industrial flue gases for biomass generation from microalgae

Kumar, P. Anil; Krishna, Shankara Narayanan; Verma, Kusum; Pooja, K.; Bhagawan, D.; Himabindu, V.

doi:10.1016/j.sajce.2018.04.006

Cited by 62 publications

(23 citation statements)

References 35 publications

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“…The differences in the performance of phycoremediation observed in this study between the cultures with and without CO 2 point to an advantage offered by mixotrophic systems in relation to pure heterotrophic profiles, possibly due to the stimulation of the photosynthetic activity with consequent increase of the algal growth rate caused by the elevation of the concentration of inorganic carbon in the culture medium, since only atmospheric CO 2 addition is not able to withstand maximum algal growth (Fig. ).…”

Section: Resultsmentioning

confidence: 74%

Evaluation of microalgae growth in a mixed‐type photobioreactor system for the phycoremediation of wastewater

Pacheco

Hoeltz

Bjerk

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Remediation of wastewater using microalgae is an alternative way of reducing environmental impacts associated with wastewater treatment while simultaneously generating biomass that can be converted into biofuels. In this study, the phycoremediation of a secondary urban effluent by native microalgae was investigated using a photobioreactor designed to receive carbon dioxide (CO2). The experiments were carried out with and without CO2 addition, and the physicochemical parameters of the effluent were monitored. The biomass yield was determined as the dry weight, and both the lipid and fatty acid profiles were obtained by gas chromatography with mass spectrometry detection. RESULTS With respect to biomass production, lipid content and phycoremediation of the secondary urban effluent, the best results were observed in the experiments using CO2. In these experiments, reductions of biological oxygen demand (54.34%), total phosphorus (92.4%), ammoniacal nitrogen (97.1%) and total Kjeldahl nitrogen (92.8%) were observed. The CO2 addition also enhanced microalgae growth, as the maximum cell density (MCD) was 54.26% higher after a shorter period of time compared to the MCD obtained without CO2 addition. The biomass yields were 0.5324 ± 0.007 g L−1 and 0.821 ± 0.014 g L−1 without and with CO2 addition, respectively. The lipid yields per unit of biomass for the CO2 supplemented cultures were not statistically different from cultures that were not supplemented with CO2, and the same was observed for fatty acid composition. CONCLUSION The use of the mixed‐type photobioreactor has been shown to be a potential alternative method for biomass production and wastewater phycoremediation. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 74%

Evaluation of microalgae growth in a mixed‐type photobioreactor system for the phycoremediation of wastewater

Pacheco

Hoeltz

Bjerk

et al. 2019

J of Chemical Tech & Biotech

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“…While it would also be feasible to accomplish this using a gas tank with a known or controllable CO 2 concentration, this approach highlights the utility in the design of the CSMS biofilm reactor modules, where the permeability of the inner silicone tube can facilitate not only the delivery of CO 2 to a biofilm, but also the collection and subsequent shuttling of CO 2 out of a biofilm. A scaled-up CSMS-based system could also feasibly integrate CO 2 -laden industrial flue gas or fermentation gas to support algal growth and achieve CO 2 bio-sequestration, a notion which is garnering increasing attention [32][33][34][35]. Delivering CO 2 in the gas phase through a CO 2 -permeable membrane, as is the case in the CSMS, may also reduce the extent of pre-processing required for these gas streams.…”

Section: Plos Onementioning

confidence: 99%

Interaction between CO2-consuming autotrophy and CO2-producing heterotrophy in non-axenic phototrophic biofilms

Ronan

Kroukamp²,

Liss³

et al. 2021

PLoS ONE

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As the effects of climate change become increasingly evident, the need for effective CO2 management is clear. Microalgae are well-suited for CO2 sequestration, given their ability to rapidly uptake and fix CO2. They also readily assimilate inorganic nutrients and produce a biomass with inherent commercial value, leading to a paradigm in which CO2-sequestration, enhanced wastewater treatment, and biomass generation could be effectively combined. Natural non-axenic phototrophic cultures comprising both autotrophic and heterotrophic fractions are particularly attractive in this endeavour, given their increased robustness and innate O2-CO2 exchange. In this study, the interplay between CO2-consuming autotrophy and CO2-producing heterotrophy in a non-axenic phototrophic biofilm was examined. When the biofilm was cultivated under autotrophic conditions (i.e. no organic carbon), it grew autotrophically and exhibited CO2 uptake. After amending its growth medium with organic carbon (0.25 g/L glucose and 0.28 g/L sodium acetate), the biofilm rapidly toggled from net-autotrophic to net-heterotrophic growth, reaching a CO2 production rate of 60 μmol/h after 31 hours. When the organic carbon sources were provided at a lower concentration (0.125 g/L glucose and 0.14 g/L sodium acetate), the biofilm exhibited distinct, longitudinally discrete regions of heterotrophic and autotrophic metabolism in the proximal and distal halves of the biofilm respectively, within 4 hours of carbon amendment. Interestingly, this upstream and downstream partitioning of heterotrophic and autotrophic metabolism appeared to be reversible, as the position of these regions began to flip once the direction of medium flow (and hence nutrient availability) was reversed. The insight generated here can inform new and important research questions and contribute to efforts aimed at scaling and industrializing algal growth systems, where the ability to understand, predict, and optimize biofilm growth and activity is critical.

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“…One of the mechanisms is storing an excess amount of phosphate absorbed into the form of polyphosphate compounds (Powell et al 2009). Another mechanism is precipitation, which can occur due to increased pH and dissolved oxygen concentrations (Kumar et al 2018). Conversely, a decrease in pH can lead to decreasing the concentration of dissolved phosphate in the medium (Sayadi et al 2016).…”

Section: Removal Efficiency Of N and P Substance From Addmwmentioning

confidence: 99%

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2020

JSM

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Chlorella vulgaris is a eukaryotic, unicellular green microalgae that can be harvested as protein source since it can contain protein up to 50% of its dry weight. However, its cultivation is costly due to the price of its growth medium. In this research we used bioslurry or known as anaerobically digested dairy manure wastewater (ADDMW) as growth medium for C. vulgaris, since dairy manure is known to contain high nitrogen and phosphorus and its availability relatively abundant in rural areas. The cultivation of C. vulgaris in the ADDMW medium was conducted in lab-scale

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Phycoremediation of sewage wastewater and industrial flue gases for biomass generation from microalgae

Cited by 62 publications

References 35 publications

Evaluation of microalgae growth in a mixed‐type photobioreactor system for the phycoremediation of wastewater

Evaluation of microalgae growth in a mixed‐type photobioreactor system for the phycoremediation of wastewater

Interaction between CO2-consuming autotrophy and CO2-producing heterotrophy in non-axenic phototrophic biofilms

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