scholarly journals Effect of the Carbon Concentration, Blend Concentration, and Renewal Rate in the Growth Kinetic ofChlorellasp.

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Adriano Arruda Henrard ◽  
Gabriel Martins da Rosa ◽  
Luiza Moraes ◽  
Michele Greque de Morais ◽  
Jorge Alberto Vieira Costa
Keyword(s):  
Specific Growth ◽  
Biomass Productivity ◽  
Cost Effective ◽  
Batch Cultivation ◽  
Maximum Specific Growth Rate ◽  
Residual Water ◽  
Microalgae Cultivation ◽  
Renewal Rate ◽  
Alternative Sources ◽  
Semicontinuous Cultivation

The microalgae cultivation can be used as alternative sources of food, in agriculture, residual water treatment, and biofuels production. Semicontinuous cultivation is little studied but is more cost-effective than the discontinuous (batch) cultivation. In the semicontinuous cultivation, the microalga is maintained in better concentration of nutrients and the photoinhibition by excessive cell is reduced. Thus, biomass productivity and biocompounds of interest, such as lipid productivity, may be higher than in batch cultivation. The objective of this study was to examine the influence of blend concentration, medium renewal rate, and concentration of sodium bicarbonate on the growth ofChlorellasp. during semicontinuous cultivation. The cultivation was carried out in Raceway type bioreactors of 6 L, for 40 d at 30°C, 41.6 µmol m−2 s−1, and a 12 h light/dark photoperiod. Maximum specific growth rate (0.149 d−1) and generating biomass (2.89 g L−1) were obtained when the blend concentration was 0.80 g L−1, the medium renewal rate was 40%, and NaHCO3was 1.60 g L−1. The average productivity (0.091 g L−1 d−1) was achieved with 0.8 g L−1of blend concentration and NaHCO3concentration of 1.6 g L−1, independent of the medium renewal rate.

scholarly journals Phycoremediation of pollutants from secondary treated coke-oven wastewater using poultry litter as nutrient source: a cost-effective polishing technique

2021 ◽  
Author(s):  
Abhilasha Rai ◽  
Aniket Sen ◽  
Biswajit Sarkar ◽  
Jitamanyu Chakrabarty ◽  
Bikash Kumar Mondal ◽  
...  
Keyword(s):  
Specific Growth ◽  
Poultry Litter ◽  
Cost Effective ◽  
Coke Oven ◽  
Maximum Specific Growth Rate ◽  
Nutrient Source ◽  
Chlorella Sp ◽  
Synechococcus Sp ◽  
Supplementary Material ◽  
Maximum Removal

Abstract The present article focuses on the phycoremediation of pollutants from secondary treated coke-oven effluent through a green and economical route. A microalgal sample was collected and identified as a consortium of Chlorella sp. and Synechococcus sp. The culture cost was reduced by using poultry litter extract as supplementary material to BG-11 medium. Since major pollutants as present in real secondary treated coke-oven wastewater are phenol, ammoniacal-N (NH4+) and cyanide, several matrices were designed with these three major pollutants by varying their initial concentrations such as phenol (2–10 mgL−1), cyanide (0.3–1 mgL−1) and NH4+ (100–200 mgL−1), termed as simulated secondary treated coke-oven wastewater. Maximum removal was observed with individual solutions of phenol (4 mgL−1), cyanide (0.6 mgL−1), and NH4+ (175 mgL−1) while maximum removal in simulated secondary treated coke-oven wastewater was observed at higher concentrations of phenol (8 mgL−1) and cyanide (0.8 mgL−1) and the same concentration of NH4+ (175 mgL−1). Consortium was found effective to meet statutory limits of pollutants. Kinetic model was developed for predicting growth of consortium and observed that the poultry litter extract enriched BG-11 medium showed higher values of maximum specific growth rate (0.56 day−1) and carrying capacity (1,330 mgL−1) than that in BG-11 medium only.

scholarly journals Decolourization of chicken compost derived liquid fertilizer via synergic ultraviolet (UV) irradiation and ozonation for enhanced microalgae cultivation

2021 ◽  
Vol 287 ◽  
pp. 04013
Author(s):  
Yik Lam Kam ◽  
Man Kee Lam ◽  
Yoke Wang Cheng ◽  
Yaleeni Kanna Dasan ◽  
Sie Yon Lau ◽  
...  
Keyword(s):  
Growth Rate ◽  
Uv Irradiation ◽  
Specific Growth ◽  
Biomass Productivity ◽  
Dry Weight ◽  
Optimal Parameters ◽  
Microalgae Cultivation ◽  
Liquid Fertilizer ◽  
Decolorization Efficiency ◽  
Initial Ph

Compost-derived liquid fertilizers are uncostly and nutrient-enriched; however, its dark brown appearance limits light uptake of microalgae during autotrophic cultivation. Here, integrated UV irradiation/ozonation pretreatment was employed to decolourize the compost solution prior to microalgae cultivation. Aforesaid pretreatment could accomplish 16.52 % (8 h) or 40.88 % (24 h) decolorization efficiency by using optimal parameters (initial pH of 12, ozone concentration of 30 mg/L, and ozone flow rate of 3 L/min. Compared to untreated compost solution, microalgae Chlorella vulgaris grew better in the medium supplemented with decolourized compost solution (after 24 h UV irradiation/ozonation). For the autotrophic cultivation of C. vulgaris with 10 vol.% compost solution, UV irradiation/ozonation pretreatment eventually increases the microalgae dry weight, specific growth rate, and biomass productivity from 0.58 g/L, 0.14 d-1, and 0.040 g/(L·d) to 0.88 g/L, 0.19 d-1, and 0.065 g/(L·d), respectively. Furthermore, the lipid content of microalgae has been increased by 33.33% with pretreatment of compost solution.

E-beam irradiation affects the maximum specific growth rate ofBacillus cereus

2012 ◽  
Vol 48 (2) ◽  
pp. 382-386 ◽  
Author(s):  
Juan Aguirre ◽  
Mª Rosa Rodríguez ◽  
Rodrigo González ◽  
Gonzalo García de Fernando
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Maximum Specific Growth Rate ◽  
Beam Irradiation ◽  
Ofbacillus Cereus

scholarly journals Quantifying relative virulence: when μ max fails and AUC alone just is not enough

2020 ◽  
Author(s):  
Ruben Michael Ceballos ◽  
Carson Len Stacy
Keyword(s):  
Specific Growth ◽  
Area Under The Curve ◽  
Maximum Specific Growth Rate ◽  
Curve Analysis ◽  
Growth Curve Analysis ◽  
Virus Infections ◽  
Susceptible Host ◽  
Host Interactions ◽  
Biological Phenomena ◽  
Single Host

A challenge in virology is quantifying relative virulence (V R) between two (or more) viruses that exhibit different replication dynamics in a given susceptible host. Host growth curve analysis is often used to mathematically characterize virus–host interactions and to quantify the magnitude of detriment to host due to viral infection. Quantifying V R using canonical parameters, like maximum specific growth rate (μ max), can fail to provide reliable information regarding virulence. Although area-under-the-curve (AUC) calculations are more robust, they are sensitive to limit selection. Using empirical data from Sulfolobus Spindle-shaped Virus (SSV) infections, we introduce a novel, simple metric that has proven to be more robust than existing methods for assessing V R. This metric (I SC) accurately aligns biological phenomena with quantified metrics to determine V R. It also addresses a gap in virology by permitting comparisons between different non-lytic virus infections or non-lytic versus lytic virus infections on a given host in single-virus/single-host infections.

scholarly journals Reduction of Hexavalent Chromium by Viable Cells of Chromium Resistant Bacteria Isolated from Chromite Mining Environment

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Satarupa Dey ◽  
Baishali Pandit ◽  
A. K. Paul
Keyword(s):  
Hexavalent Chromium ◽  
Divalent Cations ◽  
Reduction Process ◽  
Cost Effective ◽  
Batch Cultivation ◽  
Resistant Bacteria ◽  
Chromate Reduction ◽  
Viable Cells ◽  
Mining Environment ◽  
Chromite Mining

Environmental contamination of hexavalent chromium [Cr(VI)] is of serious concern for its toxicity as well as mutagenic and carcinogenic effects. Bacterial chromate reduction is a cost-effective technology for detoxification as well as removal of Cr(VI) from polluted environment. Chromium resistant and reducing bacteria, belonging to Arthrobacter, Pseudomonas, and Corynebacterium isolated from chromite mine overburden and seepage samples of Orissa, India, were found to tolerate 12–18 mM Cr(VI) during growth. Viable cells of these isolates were also capable of growing and reducing 100 μM Cr(VI) quite efficiently in Vogel Bonner (V.B.) broth under batch cultivation. Freshly grown cells of the most potent isolate, Arthrobacter SUK 1201, reduced 100 μM Cr(VI) in 48 h. Reduction potential of SUK 1201 cells decreased with increase in Cr(VI) concentration but increased with increase in cell density and attained its maximum at 1010 cells/mL. Chromate reducing efficiency of SUK 1201 was promoted in the presence of glucose and glycerol while the highest reduction was at pH 7.0 and 25°C. The reduction process was inhibited by divalent cations Ni, Co, and Cd, but not by Cu. Similarly, carbonyl cyanide m-chlorophenylhydrazone, N,N,-Di cyclohexyl carbodiimide, sodium azide, and sodium fluoride were inhibitory to chromate reduction, while 2,4 dinitrophenol promoted the process. Cells permeabilized by toluene increased the efficiency of Cr(VI) reduction and, thereby, indicate that Arthrobacter sp. SUK 1201, indigenous to chromite mining environment, could be used as an ideal tool for chromium bioremediation.

Evaluation of the Growth Performance of Microalgae Based on Fine pH Changes

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Filali R ◽  
◽  
Tian H ◽  
Micheils E ◽  
Taidi B ◽  
...  
Keyword(s):  
Growth Rate ◽  
Carbon Content ◽  
Specific Growth ◽  
Optimal Growth ◽  
Microalgae Cultivation ◽  
Photoautotrophic Growth ◽  
Microalgae Culture ◽  
Potential Applications ◽  
Photosynthetic Microorganisms ◽  
Range Of Values

Microalgae are photosynthetic microorganisms with many potential applications in the food, cosmetics, pharmaceutical and environmental industries. Currently, commercial microalgae production remains limited. Therefore, improving the growth and the culture density of the microalgae cultivation is one of the key enablers to open the way to mass production and commercialisation of these microorganisms. The effect of culture pH on the photoautotrophic growth of C. vulgaris over a large range of values has been investigated in pH-regulated cultures. For each microalgae culture, the specific growth rate, the cell density, the chlorophyll content, the intracellular carbon content and the nitrogen source consumption were monitored. Optimal growth and carbon incorporation have been observed at pH of 7.0. The fastest growth rate and highest biomass production of C. vulgaris were 0.074 h-1 and 0.896 g/L respectively. Under these conditions, a maximum carbon content of cells was 49 % (w/w).

Maximum specific growth rate of anammox bacteria revisited

2017 ◽  
Vol 116 ◽  
pp. 296-303 ◽  
Author(s):  
Lei Zhang ◽  
Yuko Narita ◽  
Lin Gao ◽  
Muhammad Ali ◽  
Mamoru Oshiki ◽  
...  
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Maximum Specific Growth Rate ◽  
Anammox Bacteria
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