Microalgae population dynamics in photobioreactors with secondary sewage effluent as culture medium

Marchello, Adriano Evandir; Lombardi, Ana Teresa; Dellamano-Oliveira, Maria José; Souza, Clóvis Wesley Oliveira de

doi:10.1590/s1517-838246120131225

Cited by 39 publications

(11 citation statements)

References 55 publications

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“…However, for biofilm microalgal system, an average pH in the beginning of cultivation cycle was 7.51, and then the pH was rapidly increased up to an average of 8.92 after the first 2 days of cultivation time, but after that the pH was slowly decreased through the end of cultivation cycle and ended up with an average of 7.03 ( Table 1). These results are in agreement with the study of Marchello et al [38], which also found that pH had a tendency to increase when microalgae were growing due to a reduction of CO 2 in the system. Besides, the decreased pH in biofilm system could be explained by a lower phototrophic activity of microalgae, which possibly caused by the light and/or nutrients limitation.…”

Section: 3) Biomass Harvesting In Biofilm Systemsupporting

confidence: 93%

Nutrient Removal by Suspended and Biofilm Microalgae for Treating the Wastewater of Agro-Industrial Pig Farm

Khiewwijit

Panyaping

Wongpankamol

2018

Walailak J Sci & Tech

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In this study, laboratory-scale suspended and biofilm microalgal systems were constructed under outdoor climatic conditions in Northern Thailand to compare their performances on nutrient nitrogen (N) and phosphorus (P) removal and biomass production from anaerobically digested piggery wastewater. At a cultivation time of 14 days, the results showed that removal efficiencies of nitrogen and phosphorus from digested piggery wastewater in biofilm microalgal system were higher than suspended microalgal system. Biofilm system removed on average of 96 % of TKN-N and 92 % of PO43--P, whereas suspended system removed on average of 84 % of TKN-N and 87 % of PO43--P. Average biomass production achieved 1.17 g dry weight/day for suspended system, while a lower production of 0.78 g dry weight/day was found for biofilm system in which possibly due to a long harvesting frequency of every 2-weeks. Meanwhile, biofilm system has an advantage over suspended system with respect to simple biomass harvesting. This combination of findings demonstrates that biofilm microalgal system is more suitable for removing N and P from digested piggery wastewater than suspended microalgal system. Besides, biomass production in biofilm microalgal system could be further optimized by shorter harvesting frequency and partially harvesting of the biofilm biomass. This study indicates that microalgae offer the potential to recover valuable nutrient resources from piggery wastewater and use biomass for sustainable energy production or other high-value products, which will improve sustainability of agro-industrial wastewater management in the future.

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Section: 3) Biomass Harvesting In Biofilm Systemsupporting

confidence: 93%

Nutrient Removal by Suspended and Biofilm Microalgae for Treating the Wastewater of Agro-Industrial Pig Farm

Khiewwijit

Panyaping

Wongpankamol

2018

Walailak J Sci & Tech

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“…Nitrogen and phosphorus present can be used for microalgae growth (organic pollutants into cellular constituents in lipid and carbohydrate forms) and possibly lead to cost reductions in the cultivation of microalgae. Chlorella vulgaris (C. vulgaris) was observed as one of the dominant microalgae strain by using sewage as the cultivation medium [3,6] .…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Light Sources on Algal Biomass and Lipid Production in Internal Leds-Illuminated Photobioreactor

Wong¹

2016

JMBA

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Illumination and nutrients are key factors to the biomass and biodiesel production from microalgae. In this study, the effects of various light wavelengths, light intensities and cultivation medium on the growth and lipid content of Chlorella vulgaris were investigated by using LEDs (Light Emitting Diodes) with different wavelengths in an Internal LEDs-Illuminated Photobioreactor. C. vulgaris was grown for 10 days under 18:6 h Light/Dark cycles with different light colors (cool white, blue and red) and intensities (50, 70, 90 and 110 μmol m-2 s-1). The effects of the illuminations were investigated for different light intensity at 25°C culture temperature. The maximum dry biomass of 1353.33 mg/L was observed at cool white light of 110 μmol m-2 s-1 during the 7 th culture day, with the highest overall dry biomass production (117.23 mg/ Ld-1) within cultivation time. The highest lipid content (34.06 %) was obtained with the blue color due to light efficiency and deep penetration. Moreover, the highest lipid productivity (31.86 mg/L d-1) was observed in 50 μmol m-2 s-1 with cool white lights. The lipid productivity was further optimized by increasing the light intensity of cool white light. The highest lipid productivity was observed at 110 μmol m-2 s-1 light intensity of 658.99 mg/L during the 10 th culture day. To conclude, the result of our study shows that C. vulgaris cultivated with wastewater in photobioreactors is efficient in producing algal biomass and removing nitrogen and phosphorus nutrient in wastewater sewage.

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“…Microalgae releases some exudates which inhibit the growth of pathogenic microorganisms. Microalgal treatment is sustainable and efficient in the reduction of coliforms in effluent before being discarded from the sewage treatment plants [77].…”

Section: Wastewater Treatment and Nutrient Removalmentioning

confidence: 99%

Microalgae Potential and Multiple Roles—Current Progress and Future Prospects—An Overview

et al. 2016

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Substantial progress has been made in algal technologies in past few decades. Initially, microalgae drew the attention of the scientific community as a renewable source of biofuels due to its high productivity over a short period of time and potential of significant lipid accumulation. As of now, a technological upsurge has elaborated its scope in phycoremediation of both organic and inorganic pollutants. The dual role of microalgae-i.e., phycoremediation coupled with energy production-is well established, however, commercially, algal biofuel production is not yet sustainable due to high energy inputs. Efforts are being made to make the algal biofuel economy through modification in the cultivation conditions, harvesting, and extraction of value added products. Recent studies have demonstrated algal biomass production with various types of wastewater and industrial effluents. Similarly, the recent advent of eco-friendly harvesting technologies-such as low-cost green coagulants, electrochemical harvesting, etc.-are energy efficient and economical. Contemporary improvement in efficient lipid extraction from biomass will make algal biodiesel economical. The absolute extraction of all the value added products from algal biomass, either whole cell or lipid extracted biomass, in a complete biorefinery approach will be more economical and eco-friendly.

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Microalgae population dynamics in photobioreactors with secondary sewage effluent as culture medium

Cited by 39 publications

References 55 publications

Nutrient Removal by Suspended and Biofilm Microalgae for Treating the Wastewater of Agro-Industrial Pig Farm

Nutrient Removal by Suspended and Biofilm Microalgae for Treating the Wastewater of Agro-Industrial Pig Farm

Effect of Different Light Sources on Algal Biomass and Lipid Production in Internal Leds-Illuminated Photobioreactor

Microalgae Potential and Multiple Roles—Current Progress and Future Prospects—An Overview

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