Optimization of environmental factors affecting tertiary treatment of municipal wastewater by Chlorella protothecoides in a lab scale photobioreactor

Binnal, Prakash; Babu, P. Nirguna

doi:10.1016/j.jwpe.2017.05.003

Cited by 30 publications

(16 citation statements)

References 19 publications

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“…h) [26]. These results therefore suggest that microalgae performance depends on the net photon flux received, and not on the lighting regime or the time of day that this energy is received.…”

Section: Same Net Photon Fluxmentioning

confidence: 72%

“…Light is a key parameter in microalgae cultivation [19,20,21,22,23,24]. In fact, light intensity, light frequency and photoperiods have been reported to influence microalgae productivity and nutrient removal efficiency [25,26]. Microalgae growth is proportional to light intensity until reaching a saturation point at which the photosynthetic activity of microalgae achieves their maximum value [27].…”

Section: Introductionmentioning

confidence: 99%

“…When it falls below this optimal value, microalgae growth will be limited [22,28]. On the other hand, if the light intensity values exceed the optimum, photosystem I (PSI) and photosystem II (PSII) will be damaged, causing microalgae photoinhibition [26,29]. Photoinhibition can be reduced by combining periods of high light irradiance with periods of darkness [27].…”

Section: Introductionmentioning

confidence: 99%

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Effect of light intensity, light duration and photoperiods in the performance of an outdoor photobioreactor for urban wastewater treatment

et al. 2019

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A series of eight experiments were carried out to analyse the effects of light intensity, light duration and photoperiods on a microalgae culture for treating AnMBR effluent at an outdoor photobioreactor (PBR) plant.Improved performance was achieved in terms of nutrient recovery rates, biomass productivity and effluent nutrient concentrations at a higher net photon flux. However, the higher irradiance was also responsible for lower biomass productivity:light irradiance ratios.None of the experiments with different lighting regimes and the same net photon flux showed any significant differences. The data obtained suggest that microalgae performance in this system did not depend on the time of day when light was applied or the length of the photoperiods, but on the net photon flux. No photoinhibiton was * Constant energy consumption of 0.8 KwhSolar light is the most economical option for outdoor microalgae cultivation [24,39], but variations in the weather, day:night cycles and seasonal changes affect light intensity

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Section: Same Net Photon Fluxmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of light intensity, light duration and photoperiods in the performance of an outdoor photobioreactor for urban wastewater treatment

et al. 2019

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“…For AOB, the optimal temperature is 30°C and bacteria grow perfectly at this temperature ( Huang et al, 2017 ). When the temperature was lower than the optimal temperature, it affected the enzymatic reaction of cells and limited the growth rate of bacteria ( Serra-Maia et al, 2016 ; Binnal and Babu, 2017 ; Huang et al, 2017 ; Manhaeghe et al, 2019 ). On the contrary, higher temperature could inactivate certain proteins in cell, reduced the activity of the microorganism, and even led to cell death ( Ras et al, 2013 ; Serra-Maia et al, 2016 ; Nwoba et al, 2019 ).…”

Section: Resultsmentioning

confidence: 99%

Immobilization of Ochrobactrum sp. on Biochar/Clay Composite Particle: Optimization of Preparation and Performance for Nitrogen Removal

et al. 2022

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The objective of this study was to prepare biochar/clay composite particle (BCCP) as carrier to immobilize Ochrobactrum sp. to degrade ammonia nitrogen (NH4+-N), and the effects of calcined program and immobilizing material were investigated. Results reflected that the parameters were as follows: calcined temperature 400°C, heating rate 20°C min–1, and holding time 2 h, and the adsorption capacity could reach 0.492 mg g–1. Sodium alginate/polyvinyl alcohol, as embedding material, jointed with NH4+-N adsorption process and then degraded by Ochrobactrum sp. with 79.39% degradation efficiency at 168 h. Immobilizing Ochrobactrum sp. could protect strain from high salt concentration to achieve the exceeding degradation efficiency than free bacteria, but could not block the impact of low temperature.

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“…In addition, the light incidence period in cultivation can be decisive for the efficiency of the wastewater treatment with indigenous microalgae. For example, C. protothecoides was influenced by photoperiod for the treatment with an excellent growth with major time of light incidence (24:0 light/dark).…”

Section: Resultsmentioning

confidence: 99%

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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Optimization of environmental factors affecting tertiary treatment of municipal wastewater by Chlorella protothecoides in a lab scale photobioreactor

Cited by 30 publications

References 19 publications

Effect of light intensity, light duration and photoperiods in the performance of an outdoor photobioreactor for urban wastewater treatment

Effect of light intensity, light duration and photoperiods in the performance of an outdoor photobioreactor for urban wastewater treatment

Immobilization of Ochrobactrum sp. on Biochar/Clay Composite Particle: Optimization of Preparation and Performance for Nitrogen Removal

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

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