Cultivation of Chlorella pyrenoidosa in outdoor open raceway pond using domestic wastewater as medium in arid desert region

Dahmani, Siham; Zerrouki, Djamal; Ramanna, Luveshan; Rawat, Ismail; Bux, Faizal

doi:10.1016/j.biortech.2016.08.019

Cited by 92 publications

(21 citation statements)

References 15 publications

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“…In other studies, removal rate of total nitrogen was observed between 61.1% -91.8% by Chlorella sp. grown in municipal wastewater [47] [48] [49] whereas 87.9% removal was recorded in this study. It was observed that 98.4% of total phosphorous was removed which is higher than removal rate reported in previous studies [46] [50] [51].…”

Section: Resultsmentioning

confidence: 68%

Nutrient Removal Efficiencies of <i>Chlorella vulgaris</i> from Urban Wastewater for Reduced Eutrophication

Singh¹,

Birru²,

Sibi³

2017

JEP

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Urban wastewater contains both organic and inorganic nutrients and discharge of untreated water increases nitrogen and phosphorous content in water bodies leading to eutrophication problem. Physical and chemical treatment of urban waste water produces large quantities of waste sludge associated with secondary pollution. Microalgae can assimilate nutrients especially nitrogen and phosphorous from wastewater for their growth and produce valuable biomass and lipid. This study was performed to determine the growth of Chlorella vulgaris in urban wastewater (UWW) and Bold's basal medium (BBM) thereby identifying cost effective growth medium for microalga cultivation. In addition, nutrient removal abilities of C. vulgaris from various dilutions of urban waste water were explored at 10 days cultivation period. Specific growth rate, biomass and lipid content were higher in microalgae grown in urban waste water than BBM. The highest lipid productivity of 14.31 mg· L −1 ·day −1 was achieved in the culture grown in UWW medium which exceeded the BBM at 1.15 fold. The amount of nutrient removal tended to increase with higher dilutions of UWW. Removal rates of upto 87.9% and 98.4%were recorded for total nitrogen and total phosphorous by C. vulgaris. The results emphasized that urban waste water as a cost effective growth medium for higher biomass and lipid production accompanied with the nutrient removal efficiency of microalgae to reduce eutrophication.

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Section: Resultsmentioning

confidence: 68%

Nutrient Removal Efficiencies of <i>Chlorella vulgaris</i> from Urban Wastewater for Reduced Eutrophication

Singh¹,

Birru²,

Sibi³

2017

JEP

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“…The United States Environmental Protection Agency designated medium (EPA medium, containing 96 mg/L NaHCO 3 , 60 mg/L CaSO 4 , 60 mg/L MgSO 4 , and 4 mg/L KCl, pH 7.5) was used for culture. The single‐cell green alga Chlorella pyrenoidosa was cultured to the exponential growth phase in the BG‐11 medium (Dahmani, Zerrouki, Ramanna, Rawat, & Bux, 2016), harvested by centrifugation at 4,000 g for 15 min, and stored at 4°C for feeding rotifers (Guo, Snell, & Yang, 2011). After acclimation for 3 months, rotifers were used for experiments.…”

Section: Methodsmentioning

confidence: 99%

“…A stock solution of 250 mg/L nTiO 2 was prepared by dispersing the nanoparticles in ultrapure water (Direct-Pure adept, RephiLe Bioscience, China) and sonication in a water-bath ultrasonic cleaner (JP-060ST, Skymen, China) for 30 min (Wang et al, 2016). | 231 phase in the BG-11 medium (Dahmani, Zerrouki, Ramanna, Rawat, & Bux, 2016), harvested by centrifugation at 4,000 g for 15 min, and stored at 4°C for feeding rotifers (Guo, Snell, & Yang, 2011). After acclimation for 3 months, rotifers were used for experiments.…”

Section: Materials and Test Organismsmentioning

confidence: 99%

Effects of TiO₂ nanoparticles on the life‐table parameters, antioxidant indices, and swimming speed of the freshwater rotifer Brachionus calyciflorus

et al. 2020

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Titanium dioxide nanoparticles (nTiO2) have raised environmental concerns and display potential hazards to aquatic organisms and even humans. However, only a few reports tested the toxicity of nTiO2 to rotifers. In the present study, acute and chronic toxicity of nTiO2 to the freshwater rotifer Brachionus calyciflorus was investigated at different temperatures. At 25°C, the 24 and 48‐hr LC50 was 117.14 and 60.11 mg/L, respectively. At 15°C, 20°C, 25°C, and 30°C, exposure to nTiO2 significantly decreased life expectancy at birth, net reproductive rate, generation time, average lifespan, and/or intrinsic rate of population increase of B. calyciflorus (p < .05). High temperature enhanced the toxicity of nTiO2 to rotifers. The swimming linear speed of rotifers significantly increased (p < .05) in treatments with 200 µg/L nTiO2, compared with the control. In addition, treatments with 8 µg/L to 5 mg/L nTiO2 significantly increased superoxide dismutase activity (p < .05). Glutathione content and catalase activity increased significantly after exposure to 8 µg/L nTiO2 but decreased significantly in treatments with nTiO2 concentrations ranging from 40 µg/L to 5 mg/L (p < .05). There were no significant changes in malondialdehyde contents among nTiO2 treatments and control. Overall, the present study indicated that nTiO2 revealed high toxicity to rotifers, displaying high environmental risks to aquatic ecosystems.

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“…Open air systems have a low energy cost for cultivation as they utilize solar energy. However, there are limitations to controlling operation conditions such as light intensity or temperature, and thus optimal periods for algal cultivation and the selective cultivation of specific algal groups are limited [15][16][17][18]. Thus, closed systems are preferred to optimize algal cultivation conditions for biofuel production and nutrient removal in wastewater treatment plants as the operational parameters, such as characteristics and intensities of light, are controllable [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Inhibition of Photosynthetic Activity in Wastewater-Borne Microalgal–Bacterial Consortia under Various Light Conditions

Kang¹,

Kim

Heo

et al. 2019

Sustainability

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Microalgal–bacterial consortia are considered an alternative method to conventional wastewater treatment processes with several benefits, such as low oxygen production cost and reduced emission of carbon dioxide resulting from photosynthetic activity. Besides, microalgae effectively remove various emerging contaminants and heavy metals that are hardly removed by conventional wastewater treatment processes. The purpose of this study is finding optimal operation conditions (e.g., light wavelengths, light intensity, microalgal–bacterial consortia biomass) when applying microalgae in wastewater treatment system. Firstly, reduced transmittance was monitored at four different wavelengths (i.e., blue, green, red, and white light) and at various concentrations of microalgal–bacterial consortia. Light transmittance rates were rapidly reduced as the biomass increased, where the highest transmittance was observed in green light. Secondly, the reduction of oxygen production over time, by the inhibition of the photosynthetic activity, was tested as the light intensity increased at four different wavelengths and at low (100 mg L−1) and high (500 mg L−1) concentrations of microalgal–bacterial consortia. The observations and subsequent statistical analyses verify that microalgal–bacterial consortia show the strongest resistance to the inhibition of the photosynthetic activity in green light, with white coming next, when the intensity of light is increased.

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Cultivation of Chlorella pyrenoidosa in outdoor open raceway pond using domestic wastewater as medium in arid desert region

Cited by 92 publications

References 15 publications

Nutrient Removal Efficiencies of <i>Chlorella vulgaris</i> from Urban Wastewater for Reduced Eutrophication

Nutrient Removal Efficiencies of <i>Chlorella vulgaris</i> from Urban Wastewater for Reduced Eutrophication

Effects of TiO₂ nanoparticles on the life‐table parameters, antioxidant indices, and swimming speed of the freshwater rotifer Brachionus calyciflorus

Inhibition of Photosynthetic Activity in Wastewater-Borne Microalgal–Bacterial Consortia under Various Light Conditions

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Cultivation of Chlorella pyrenoidosa in outdoor open raceway pond using domestic wastewater as medium in arid desert region

Cited by 92 publications

References 15 publications

Nutrient Removal Efficiencies of &lt;i&gt;Chlorella vulgaris&lt;/i&gt; from Urban Wastewater for Reduced Eutrophication

Nutrient Removal Efficiencies of &lt;i&gt;Chlorella vulgaris&lt;/i&gt; from Urban Wastewater for Reduced Eutrophication

Effects of TiO2 nanoparticles on the life‐table parameters, antioxidant indices, and swimming speed of the freshwater rotifer Brachionus calyciflorus

Inhibition of Photosynthetic Activity in Wastewater-Borne Microalgal–Bacterial Consortia under Various Light Conditions

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Nutrient Removal Efficiencies of <i>Chlorella vulgaris</i> from Urban Wastewater for Reduced Eutrophication

Nutrient Removal Efficiencies of <i>Chlorella vulgaris</i> from Urban Wastewater for Reduced Eutrophication

Effects of TiO₂ nanoparticles on the life‐table parameters, antioxidant indices, and swimming speed of the freshwater rotifer Brachionus calyciflorus