Enhanced biomass production and pollutant removal by duckweed in mixotrophic conditions

2020 ◽  
Vol 317 ◽  
pp. 124029
Author(s):  
Zuoliang Sun ◽  
Wenjun Guo ◽  
Jingjing Yang ◽  
Xuyao Zhao ◽  
Yan Chen ◽  
...  
Keyword(s):  
Biomass Production ◽  
Pollutant Removal ◽  
Mixotrophic Conditions

Effects of Cultivation Conditions and Media Compositions on Lipid Productivity of Native Microalga Chlorella vulgaris U3-3

2013 ◽  
Vol 291-294 ◽  
pp. 262-266
Author(s):  
Peng Zhao ◽  
Xu Ya Yu ◽  
Jun Jun Li ◽  
Xian Hua Tang ◽  
Zhen Rong Xie ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Biomass Production ◽  
Chlorella Vulgaris ◽  
Medium Composition ◽  
Lipid Productivity ◽  
Biodiesel Production ◽  
Cultivation Condition ◽  
Heterotrophic Condition ◽  
Fatty Acid Compositions ◽  
Mixotrophic Conditions

A native microalgae strain Chlorella vulgaris U3-3from Baimaxueshan Yunnan province has been isolated and identified as a potential feedstock for biodiesel production. The biomass production, lipid productivity, and fatty acid compositions of U3-3 are investigated and compared under phototrophic, heterotrophic and mixotrophic conditions with various media. U3-3 under phototrophic growth on BG11 medium shows higher cellular lipid content (44.6%) than those under heterotrophic and mixotrophic conditions. And U3-3 display its higher biomass production (5.55g/L) than those under phototrophic and heterotrophic conditions growing on optimized medium with supply 35g/L glucose under mixotrophic condition. However, Chlorella vulgaris U3-3 growing under heterotrophic condition with optimized medium of supply 35g/L glucose exhibited more than 7.26-fold and 1.05-fold increase in lipid productivity compared with that under phototrophic and mixotrophic conditions. Moreover, Chlorella vulgaris U3-3 has suitable fatty acid compositions with high saturated acid contents (28.76%) and favorable degree of unsaturation (92.86) growing under heterotrophic condition with optimized medium of supply 35g/L glucose, suggesting its potential as a biodiesel feedstock on this cultivation condition and medium composition.

scholarly journals NUTRIENT RECOVERY AND POLLUTANT REMOVAL FROM PIGGERY WASTEWATER BY SPIRULINA CULTIVATION

2020 ◽  
Vol 58 (3A) ◽  
pp. 187
Author(s):  
Yen Thi Thai Doan ◽  
Nga Thuy Nguyen ◽  
My Tra Phung ◽  
Chau Ngoc Nguyen ◽  
Huong Thi Do
Keyword(s):  
Growth Rate ◽  
Biomass Production ◽  
N:P Ratio ◽  
Pollutant Removal ◽  
Nutrient Recovery ◽  
High Concentration ◽  
Piggery Wastewater ◽  
N:P Ratios ◽  
The Cost ◽  
Protein Rich

Spirulina is noticed for great applications on food supplements, animal feeds, pharmaceutical, cosmetics, biofuel, fertilizer, etc. Spirulina cultures in wastewaters could enhance the feasibility of commodities due to its ability to reduce the cost of biomass production and remove pollutants in wastewaters. This study investigates the effects of wastewater pretreatment using various aeration periods (i.e. from 3 to 7 days), the supplement of bicarbonate and N:P ratios on the growth of Spirulina sp. HH to produce protein-rich biomass. The work showed that Spirulina sp. had the ability to effectively remove ammonium, with the highest efficiencies up to 99.9 %. However, the high concentration of ammonium in wastewater, from 125 mg N/L upward, caused a decline in the growth rate of Spirulina. The growth and remediation potential of Spirulina sp. were in the best condition with the N:P ratio of the medium in the range of 19:1-22:1. This study suggested a procedure to cultivate Spirulina sp. in piggery wastewater and remove pollutants efficiently.

Cultivating microalgae in wastewater for biomass production, pollutant removal, and atmospheric carbon mitigation; a review

2020 ◽  
Vol 704 ◽  
pp. 135303 ◽  
Author(s):  
Ayesha Shahid ◽  
Sana Malik ◽  
Hui Zhu ◽  
Jianren Xu ◽  
Muhammad Zohaib Nawaz ◽  
...  
Keyword(s):  
Biomass Production ◽  
Pollutant Removal ◽  
Carbon Mitigation ◽  
Atmospheric Carbon

scholarly journals Plant Biomass Production in Constructed Wetlands Treating Swine Wastewater in Tropical Climates

Fermentation ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 296
Author(s):  
Mayerlin Sandoval-Herazo ◽  
Georgina Martínez-Reséndiz ◽  
Eduardo Fernández Echeverria ◽  
Gregorio Fernández-Lambert ◽  
Luis Carlos Sandoval Herazo
Keyword(s):  
Constructed Wetlands ◽  
Biomass Production ◽  
Constructed Wetland ◽  
Large Scale ◽  
Plant Biomass ◽  
Typha Latifolia ◽  
Pollutant Removal ◽  
Swine Wastewater ◽  
High Concentrations ◽  
Tropical Climates

The production of both aboveground and belowground plant biomass in constructed wetlands (CW) is a poorly understood topic, although vegetation plays an important role in the process of pollutant removal from wastewater. The objective of this study was to evaluate the aboveground and belowground biomass production of Typha latifolia and Canna hybrids in a large-scale constructed wetland treating swine wastewater in tropical climates. Parameters, such as temperature, DO, pH, COD, TSS, TN, TP, and TC, as well as destructive and non-destructive biomass, were evaluated. It was found that, despite the high concentrations of pollutants, the vegetation adapted easily and also grew healthily despite being exposed to high concentrations of pollutants from swine water. Although Typha latifolia (426 plants) produced fewer plants than Canna hybrids (582 plants), the higher biomass of the Typha latifolia species was slightly higher than that of Canna hybrids by 5%. On the other hand, the proximity of the water inlet to the system decreased the capacity for the development of a greater number of seedlings. As for the elimination of pollutants, after treatment in the constructed wetland, COD: 83.6 ± 16.9%; TSS: 82.2 ± 17.7%; TN: 94.4 ± 15.8%; TP: 82.4 ± 23.2%; and TC: 94.4 ± 4.4% were significantly reduced. These results show that wetlands constructed as tertiary systems for the treatment of swine wastewater produce a large amount of plant biomass that significantly helps to reduce the concentrations of pollutants present in this type of water in tropical areas. The use of these plants is recommended in future wetland designs to treat swine wastewater.

scholarly journals Effect of Different Influent Conditions on Biomass Production and Nutrient Removal by Aeration Microalgae Membrane Bioreactor (ICFB-MMBR) System for Mariculture Wastewater Treatment

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 874
Author(s):  
Yi Ding ◽  
Shiyuan Wang ◽  
Hang Ma ◽  
Binyu Ma ◽  
Zhansheng Guo ◽  
...  
Keyword(s):  
Growth Rate ◽  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Biomass Production ◽  
Nutrient Removal ◽  
Membrane Bioreactor ◽  
Removal Rate ◽  
Pollutant Removal ◽  
Average Growth ◽  
Pollutant Removal Rate

The nutrient removal and biomass production of the internal circulating fluidized bed microalgae membrane bioreactor (ICFB-MMBR) was studied under different cultivation modes, influent TOC, influent pH, and influent N/P. Platymonas helgolandica tsingtaoensis was used as the biological source. The growth of P. helgolandica tsingtaoensis and the removal efficiency of pollutants in the mixotrophy culture mode were improved compared with other culture modes. With the increased influent TOC, the average growth rate of P. helgolandica tsingtaoensis increased, and ammonia nitrogen and total phosphorus removal rate were improved. The P. helgolandica tsingtaoensis growth rate and nutrient removal efficiencies at the influent pH of 8 were the best among the different influent pH values. As the influent N/P ratio increased from 5 to 20, the P. helgolandica tsingtaoensis growth rate and pollutant removal rate increased gradually. When the influent N/P ratio was higher than 20, the P. helgolandica tsingtaoensis growth rate and pollutant removal rate tended to be stable and did not significantly change with the increase of influent N/P ratio. At the proper influent conditions, the high P. helgolandica tsingtaoensis biomass and nutrient removal efficiency could be obtained in the microalgae membrane bioreactor, which could provide a theoretical basis for the application of the system for wastewater treatment.

scholarly journals Evaluation of herbaceous crops irrigated with treated wastewater for ethanol production

2013 ◽  
Vol 44 (2s) ◽  
Author(s):  
Salvatore Barbagallo ◽  
Antonio Barbera ◽  
Giuseppe L. Cirelli ◽  
Mirco Milani ◽  
Attilio Toscano ◽  
...  
Keyword(s):  
Ethanol Production ◽  
Biomass Production ◽  
Constructed Wetland ◽  
Treatment Plant ◽  
Biomass Productivity ◽  
Arundo Donax ◽  
Pollutant Removal ◽  
Treated Wastewater ◽  
Italian Law ◽  
Herbaceous Crops

The competition for freshwater between agricultural, industrial, and civil uses has greatly increased in Mediterranean basin characterized by prolonged dry seasons. The aim of this study was to evaluate biomass production and the potential ethanol production of promising “no-food” herbaceous crops irrigated with low quality water at different ETc restitutions (0%, 50 and 100%). The research was carried out, in 2011 and 2012, in an open field near the full-scale constructed wetland (CW) municipal treatment plant located in the Eastern Sicily (Italy). The CW effluent has been applied in a experimental irrigation field of Vetiveria zizanoides (L.) Nash, Miscanthus x giganteus Greef et Deu. and Arundo donax (L.). Physical, chemical and microbiological analyses were carried out on wastewater samples collected at inlet and outlet of CW and pollutant removal efficiencies were calculated for each parameter. Bio-agronomical analysis on herbaceous species were made with the goal to evaluate the main parameters such as the plant dimension, the growth response and the biomass production. Biomass dry samples were processed with a three-step chemical pretreatment, hydrolysed with a mix of commercial enzymes and next fermented to obtain the yield of ethanol production. Average TSS, COD and TN removal for CW were about 74%, 67% and 68%, respectively. Although the satisfactory Escherichia coli removal, about 3.5 log unit for both beds on average, CW didn’t achieve the restrictive Italian law limits for wastewater reuse. As expected, irrigation was beneficial and the full ET replenishment increase the biomass productivity as compared to the other two treatment. The mean productivity of Vetiveria zizanoides and Myscanthus x giganteus were about 9, 26 and 38 t ha–1 and 3, 7 and 12 t ha–1 respectively in 0%, 50% and 100% ETc restitutions. Arundo donax gave higher values of dry biomass (78 t ha–1 in 100% ETc restitution in 2011 season), and potential ethanol production (about 3,744 kg ha–1). These results suggest the interest in the use of constructed wetland effluents for the irrigation of energy crops to obtain second generation ethanol, particularly in semiarid regions such as the Mediterranean area.

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