Cr6+ bioremediation efficiency of Oscillatoria laete-virens (Crouan &amp; Crouan) Gomont and Oscillatoria trichoides Szafer: kinetics and equilibrium study

Miranda, Jyothi; Krishnakumar, G.; Gonsalves, Richard

doi:10.1007/s10811-012-9800-x

Cited by 21 publications

(8 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two species of Oscillatoria, viz. Oscillatoria laetevirens and Oscillatoria trichoides, isolated from these sites were found to be promising biosorbents for Cr 6+ during our earlier study (Miranda et al 2012).…”

Section: Discussionmentioning

confidence: 77%

Microalgal diversity in relation to the physicochemical parameters of some Industrial sites in Mangalore, South India

Miranda

Krishnakumar

2015

Environ Monit Assess

Self Cite

View full text Add to dashboard Cite

This study is undertaken to understand the microalgal species composition, diversity, abundance and their association with the polluted sites of an industrial area. The microalgae and the wastewater samples collected from these sites were preserved and analysed using standard methods. One hundred and eight species of the microalgae, belonging to Cyanophyceae, Chlorophyceae, Euglenophyceae, Bacillariophyceace and Desmidaceae, were identified. Of these, the members of Cyanophyceae formed the dominant flora. It was observed that the family Oscillatoriaceae was the most diverse family. In this family, the most diverse genus was found to be the Oscillatoria, with 13 species. Further, the abundance of Oscillatoria princeps indicated that these species are tolerant to the pollution and therefore considered as the 'marker species' of the habitat. The abundance of the Cyanophyceae in these sites was found to be due to the favourable contents of the oxidizable organic matter and the presence of the nutrients, such as the nitrates and the phosphates, in abundance, with less dissolved oxygen. The lesser percentage of the Bacillariophyceae (14%), and the negligible number of the euglenoids (2%) indicated that the sites were rich in the inorganic pollutants and poor in the organic pollutants. The range of Shannon diversity indices was found between 2.10 and 3.50, while the dominance index was found between 0.03 and 0.14, the species evenness between 0.73 and 0.93 and the Margalef index between 1.8 and 6.3. The diversity indices indicated that there is light to moderate level of pollution in the studied sites, with moderate diversity level. The principal component analysis (PCA) of the physicochemical parameters identified the four possible groups, which were responsible for the data structure, explaining the 74% of the total variance of the data set. In the PCA performed using all the variables, the first principal component showed the positive correlation with the total dissolved solids (TDS), salinity, conductivity, temperature, biochemical oxygen demand (BOD) and the sulphates and the negative correlation with the dissolved oxygen (DO) and Pb2+. The second principal component showed the positive correlation with the pH, dissolved oxygen, chemical oxygen demand (COD), nitrates and phosphates, and the negative correlation with the TDS, salinity, conductivity, temperature and BOD. The canonical correspondence analysis (CCA) showed that there were significant (p<0.05) positive and negative relationships between some of the physicochemical parameters and the microalgal species at these sites. The results showed that Calonies bacillum and Pseudanabaena amphigranulata were in close positive association with the pH, DO, COD, chlorides, nitrates and Cu+2 at the third and the fifth sites; the Navicula sphaerophora, Stigonema minutum and Chlamydomonas sphagnicola were in close positive association with the phosphates and the lead at the first, second and the fifth sites; the Anabaena spiroides, Anabaena constricta, Oscillatoria curvic...

show abstract

Section: Discussionmentioning

confidence: 77%

Microalgal diversity in relation to the physicochemical parameters of some Industrial sites in Mangalore, South India

Miranda

Krishnakumar

2015

Environ Monit Assess

Self Cite

View full text Add to dashboard Cite

show abstract

“…Some filamentous cyanobacteria, such as, Phormidium valderianum [66], Oscillatoria sp. [91], and Spirulina platensis, [7,43] also show excellent capacity to sorb heavy metals from aqueous solutions. Kumar et al [72] have demonstrated great metal sorption capacity of five cyanobacterial mats dominated by species of Oscillatoria, Phormidium, Lyngbya, Aulosira, and Scytonema.…”

Section: Introductionmentioning

confidence: 99%

Metal sorption by algal biomass: From batch to continuous system

2016

View full text Add to dashboard Cite

“…A lower “ b ” value, obtained in the present study, indicates greater affinity of the sorbent for the sorbed metal (Volesky, ), and is more suitable for removing the metal at very low concentrations. Hence, the RPS of this species seems to be a good biosorbent for the Cr 6+ , as it has higher “ q max ” and lower values of “ b .” Oscillatoria trichoides biomass was also found to be a good biosorbent of Cr 6+ from aqueous solutions during our previous work (Miranda et al., ). EPS are able to interact with the toxic metals by various mechanisms including van der Waals’ forces, electrostatic attraction, and surface complexation (Guibaud, Hullebusch, & Bordas, ).…”

Section: Discussionmentioning

confidence: 70%

“…Oscillatoria trichoides, an indigenous isolate from a polluted environment, was also found to be significantly more tolerant to hexavalent chromium (Cr 6+ ) ions, showing more biosorptive potential than O. laete-virens during our previous study (Miranda, Krishnakumar, & Gonsalves, 2012). Therefore, to understand its higher tolerance capacity, we have continued this work.…”

mentioning

confidence: 95%

Partial characterization of the exopolysaccharide from Oscillatoria trichoides Szafer and the role of released polysaccharide in sequestration of Cr⁶⁺

Miranda¹,

Krishnakumar

2018

Remediation Journal

Self Cite

View full text Add to dashboard Cite

The structural investigation and the chromium adsorptive potential of an exopolysaccharide (EPS) released during the growth of an indigenous cyanobacterium, Oscillatoria trichoides Szafer, were investigated in a laboratory‐scale study. The results showed that, of the total EPS produced, 410.53 milligrams/gram (mg g−1) were released polysaccharides (RPS) and 11.36 mg g−1 were capsular polysaccharides (CPS). The sorption of hexavalent chromium (Cr6+) by the RPS achieved a maximum amount of metal removal (qmax) value of 76.92 mg g−1 of polysaccharide dry weight. The highest coefficient of determination (0.9742) for the Langmuir adsorption model indicates best fitness of the model in explaining the sorption as a unilayer process. Equilibrium studies indicated that 30 to 40 milligrams per liter initial chromium concentration and a pH of 2 were optimal for biosorption of chromium by the RPS. Scanning electron microscopy with energy‐dispersive X‐ray spectroscopy analysis of Cr6+‐treated RPS showed the presence of 3.76% bound chromium. Compositional analysis of the EPS showed the presence of carbohydrates, proteins, pyruvic acid, and hexosamines. High‐performance liquid chromatography analysis demonstrated the presence of hexoses, as neutral sugars and glucuronic acid as an acidic sugar. The presence of carboxylic groups was also detected by infrared spectroscopy. The presence of these chemical constituents may serve as binding sites for the metal ions; therefore, the RPS of this species appears to be a promising biosorbent for Cr6+.

show abstract

Cr6+ bioremediation efficiency of Oscillatoria laete-virens (Crouan & Crouan) Gomont and Oscillatoria trichoides Szafer: kinetics and equilibrium study

Cited by 21 publications

References 62 publications

Microalgal diversity in relation to the physicochemical parameters of some Industrial sites in Mangalore, South India

Microalgal diversity in relation to the physicochemical parameters of some Industrial sites in Mangalore, South India

Metal sorption by algal biomass: From batch to continuous system

Partial characterization of the exopolysaccharide from Oscillatoria trichoides Szafer and the role of released polysaccharide in sequestration of Cr⁶⁺

Contact Info

Product

Resources

About

Cr6+ bioremediation efficiency of Oscillatoria laete-virens (Crouan & Crouan) Gomont and Oscillatoria trichoides Szafer: kinetics and equilibrium study

Cited by 21 publications

References 62 publications

Microalgal diversity in relation to the physicochemical parameters of some Industrial sites in Mangalore, South India

Microalgal diversity in relation to the physicochemical parameters of some Industrial sites in Mangalore, South India

Metal sorption by algal biomass: From batch to continuous system

Partial characterization of the exopolysaccharide from Oscillatoria trichoides Szafer and the role of released polysaccharide in sequestration of Cr6+

Contact Info

Product

Resources

About

Partial characterization of the exopolysaccharide from Oscillatoria trichoides Szafer and the role of released polysaccharide in sequestration of Cr⁶⁺