Enhancement of nutrients removal and biomass accumulation of Chlorella vulgaris in pig manure anaerobic digestate effluent by the pretreatment of indigenous bacteria

2021 ◽  
Vol 328 ◽  
pp. 124846
Author(s):  
Zhiqiang Gu ◽  
Yuhuan Liu ◽  
Guyue Zou ◽  
Qi Zhang ◽  
Rumeng Lu ◽  
...  
Keyword(s):  
Chlorella Vulgaris ◽  
Biomass Accumulation ◽  
Pig Manure ◽  
Nutrients Removal ◽  
Indigenous Bacteria ◽  
Anaerobic Digestate

Wastewater Nutrients Removal by Chlorella Vulgaris: Optimization Through Acclimation

1996 ◽  
Vol 17 (2) ◽  
pp. 183-189 ◽  
Author(s):  
P. S. Lau ◽  
N.F. Y. Tam ◽  
Y. S. Wong
Keyword(s):  
Chlorella Vulgaris ◽  
Nutrients Removal

scholarly journals Nutrient and Tetracycline Removal From Simulated Biogas Slurry and Biogas Upgrading by Microalgae Cultivation Under Different Carbon Nanotubes Concentration

2021 ◽  
Author(s):  
Li Sun ◽  
Chunzhi Zhao ◽  
Shiqing Sun ◽  
Changwei Hu ◽  
Yongjun Zhao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chlorella Vulgaris ◽  
Oxygen Demand ◽  
Dry Weight ◽  
Fluorescence Induction ◽  
Biogas Slurry ◽  
Nutrients Removal ◽  
Induction Kinetics ◽  
Multi Walled Carbon Nanotubes ◽  
Removal Efficiencies

Abstract The present study aimed to determine the effects of multi-walled carbon nanotubes (MWCNTs) concentrations (0, 0.1, 1, 5, 10 mg·L− 1) on tetracycline (TC) and biogas slurry nutrients removal by microalgae Chlorella vulgaris cultivation. Treatments with 1 mg·L− 1 MWCNTs yielded maximum dry weight and cells quantity of 0.81 ± 0.008 g·L− 1 and 5.83×107 cell·L− 1, respectively. The results of chlorophyll a were consistent with rapid fluorescence induction kinetics (OJIP-test), indicating that moderate MWCNTs concentration could enhance microalgal photosynthesis. Maximum chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN), tetracycline (TC), and CO2 removal efficiencies were 90.43 ± 5.15%, 78.12 ± 4.33%, 77.07 ± 4.12%, 89.64 ± 3.08%, and 64.26 ± 0.71%, respectively when treated with 1 mg·L− 1 MWCNTs. Of the five MWCNTs concentrations set in this study, the optimal concentration was 1 mg·L− 1 for nutrient and CO2 removal efficiencies. These results indicated that moderate MWCNTs concentrations would promote tetracycline and nutrients removal by enhancing Chlorella vulgaris photosynthesis activity.

scholarly journals Immobilized Microalgae using Alginate for Wastewater Treatment

2021 ◽  
Vol 29 (3) ◽  
Author(s):  
Amanatuzzakiah Abdul Halim ◽  
Wan Nor Atikah Wan Haron
Keyword(s):  
Wastewater Treatment ◽  
Chlorella Vulgaris ◽  
Immobilized Cells ◽  
High Energy ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Nutrients Removal ◽  
Removal Rates ◽  
Inorganic Substances ◽  
Suspended Cells

Organic and inorganic substances are released into the environment because of domestic, agricultural, and industrial activities which contribute to the pollution of water bodies. Removal of these substances from wastewater using conventional treatment involves high energy cost for mechanical aeration to provide oxygen for aerobic digestion system. During this process, the aerobic bacteria rapidly consume the organic matter and convert it into single cell proteins, water, and carbon dioxide. Alternatively, this biological treatment step can be accomplished by growing microalgae in the wastewater. Chlorella vulgaris immobilized in calcium alginate was used to study the removal efficiency of main nutrients in wastewater such as ammonium and phosphate that act as an important factor in microalgae growth. The immobilized cells demonstrated higher percentage of ammonium and phosphate removal of 83% and 79% respectively, compared to free-suspended cells (76% and 56%). COD removal recorded was 89% and 83% for immobilized cells and free-suspended cells, respectively. The kinetics parameters of nutrients removal for immobilized C. vulgaris in synthetic wastewater were also determined. The specific ammonium removal rates (RA) and phosphate removal rates (RP) for Chlorella vulgaris in synthetic wastewater were 8.3 mg.L-1day-1 and 7.9 mg.L-1day-1, respectively. On the other hand, the kinetic coefficient for each nutrient removal determined were kA = 0.0462 L.mg-1 day-1 NH4 and kP = 0.0352 L.mg-1 day-1 PO43-. This study proves the application of immobilized microalgae cells is advantageous to the wastewater treatment efficiency. Furthermore, optimization on the immobilization process can be conducted to further improve the nutrients removal rates which potentially can be applied in the large-scale wastewater treatment process.

The effects of Bentagran on the development and antioxidant parameters of Arthrospira platensis Gomont and Chlorella vulgaris Beyerinck (Beijerinck)

2021 ◽  
Vol 57 ◽  
pp. 11
Author(s):  
Şükrüye ER ◽  
Hatice Tunca ◽  
Ali Doğru ◽  
Tuğba Ongun Sevindik
Keyword(s):  
Chlorella Vulgaris ◽  
Reductase Activity ◽  
Biomass Accumulation ◽  
Arthrospira Platensis ◽  
Dependent Manner ◽  
Sod Activity ◽  
Antioxidant Parameters ◽  
Glutathione Reductase Activity ◽  
Significant Change ◽  
Oxidative Effects

The aim of the study is to determine the effects of Bentagran on growth and oxidative effects to Chlorella vulgaris and Arthrospira platensis and to evaluate the herbicide toxicity on primary producers of aquatic ecosystems. The decrease in both biomass accumulation and chlorophyll-a content in a dose-dependent manner were observed in both organisms exposed to different Bentagran concentrations (for C. vulgaris 60–960 µg mL−1; for A. platensis 100–800 µg mL−1) during 7 days. SOD activity increases significantly in Chlorella vulgaris and Arthrospira platensis at concentrations of 480 and 200 ug mL−1, respectively. Although there was no significant change in APX (ascorbate peroxidase) activity in C. vulgaris, the APX activity decreased at 400 and 600 µg mL−1 concentrations in A. platensis. While the GR (glutathione reductase) activity increased at 960 µg mL−1 concentration in C. vulgaris, it also showed increases at 100, 200 and 400 μg mL−1 concentrations, but it decreased at 600 µg mL−1 concentration in A. platensis. MDA (malondialdehyde) and proline amounts decreased only at the concentration of 960 µg mL−1, while H2O2 didn't change compared to control. Total MDA, H2O2 (hydrogen peroxide) and proline amounts did not show significant change compared to control. It is found that the effects of Bentagran on growth and antioxidant parameters are diverse at different concentrations and species, and this can be attributed to the different reactive oxygen species (ROS) production ability in these species.

Effect of Synthetic Wastewater by Electrochemical Pretreatment on Chlorella vulgaris Growth and Nutrients Removal

2013 ◽  
Vol 666 ◽  
pp. 33-42 ◽  
Author(s):  
Meng Zi Wang ◽  
Zhi Wei Zhu ◽  
Wei Cao ◽  
Hong De Zhou ◽  
Yu Wu ◽  
...  
Keyword(s):  
Chlorella Vulgaris ◽  
Biological Treatment ◽  
Dry Weight ◽  
Synthetic Wastewater ◽  
Biomass Growth ◽  
Nutrients Removal ◽  
Microalgae Cultivation ◽  
Electrochemical Processing ◽  
Electrochemical Pretreatment ◽  
Organic Wastewater

Electrochemical processing combined with the system of microalgaeChlorella vulgariswas used to treat the synthetic organic wastewater in this paper. The effect of wastewater concentration on the biomass growth and nutrients removal was investigated. Three levels of the wastewater concentrations were ranked as Low, Mid and High, respectively. After 2 h of electrolysis pretreatment and 10 d of microalgae cultivation, TOC, NH4-N, and TP concentrations in the group Low were reduced by 83.7%, 99.3% and 95.0%, respectively. TheChlorella vulgarisin the groups Mid and High without electrolysis pretreatment did not survive longer than 24 h, whereas it grown well in the wastewater pretreated by electrolysis. The dry weight (DW) ofChlorella vulgarisin the group Low with electrolysis pretreatment was increased from 0.048 g/l to 1.087 g/l by 10 d cultivation. Results indicate that electrolysis pretreatment for wastewater can provide appropriate conditions for the subsequent biological treatment and efficiently promote the biomass growth ofChlorella vulgaris.

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