Bioflocculant production from Solibacillus silvestris W01 and its application in cost-effective harvest of marine microalga Nannochloropsis oceanica by flocculation

Wan, Chunrong; Zhao, Xin‐Qing; Guo, Suo-Lian; Alam, Md. Asraful; Bai, Feng‐Wu

doi:10.1016/j.biortech.2012.10.004

Cited by 157 publications

(76 citation statements)

References 24 publications

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“…Similarly, Wan et al (2013) reported that maltose was the preferred carbon source for bioflocculant production by Solibacillus silvestris exhibiting a flocculating activity of 88.7% [12]. He et al [41] reported that glucose, sucrose and fructose were preferred carbon sources for REA-11 production, a bioflocculant produced by Corynebacterium glutamicum.…”

Section: Effect Of Nitrogen Source On Bioflocculant Productionmentioning

confidence: 99%

Assessment of Bacillus pumilus Isolated from Fresh Water Milieu for Bioflocculant Production

et al. 2016

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Abstract:A bioflocculant produced by a Bacillus species was assessed with regards to its physiochemical properties and flocculating efficiency. Identification of the bacteria through 16S rDNA sequencing revealed it to have 99% similarity to Bacillus pumilus strain ZAP 028. The optimum culture conditions for bioflocculant production by the bacterial strain were inoculum size of 4% (v/v), maltose as a sole carbon source, multiple nitrogen source (yeast extract, urea and ammonium sulfate) and medium initial pH 7. The bioflocculant was thermostable with high flocculating rate for kaolin suspension at low dosage 0.1 mg/mL over a wide pH range (3-11). Fourier-transform infrared (FTIR) spectroscopy analysis result of the purified bioflocculant showed that hydroxyl, amino and carboxyl groups were the main functional moieties in its molecular structure. The bioflocculant was composed of sugar (75.4%), protein (5.3%) and uronic acid (15.4%). Scanning electron microscopy (SEM) showed a dendritic bioflocculant structure and the energy dispersive X-ray spectroscopy (EDX) analysis revealed that the purified bioflocculant had weight fractions of elements as follows: 22.71% of C, 11.56% of N, 41.60% of O, 0.51% of S and 7.98% of P. The bioflocculant produced had strong flocculating activity and high thermal stability, which affords its utilization in industrial processes.

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Section: Effect Of Nitrogen Source On Bioflocculant Productionmentioning

confidence: 99%

Assessment of Bacillus pumilus Isolated from Fresh Water Milieu for Bioflocculant Production

et al. 2016

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“…This bioflocculant is a significant improvement from earlier ones, since it can be recycled losing only 3% of flocculation efficiency and it is innocuous to microalgal cells [45].…”

Section: Auto and Bioflocculationmentioning

confidence: 99%

Harvesting techniques applied to microalgae: A review

Barros

Gonçalves

Simões

et al. 2015

Renewable and Sustainable Energy Reviews

746

295

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Research studies on microalgae have increased in the last decades due to the wide range of applications associated to these photosynthetic microorganisms. Microalgae are an important source of oils and other biomolecules that can be used in the production of biofuels and high-valued products. However, the use of microalgae in these green processes is still not economically viable. One of the main costs associated to microalgal production is related to the harvesting process, as it usually accounts for about 20-30% of total cost. Therefore, this review focuses on the main harvesting processes applied to microalgae, presenting the main advantages and disadvantages of each method, to allow the selection of an appropriate procedure to effectively separate microalgal biomass from the culture medium. To reduce the associated costs, it is common to harvest microalgae in a two-step separation: (i) thickening procedures, in which microalgal slurry is concentrated to about 2-7% of total suspended solids; and (ii) dewatering procedures, which result in the concentration of microalgal slurry to 15-25% of total suspended solids. Selection of the adequate harvesting methods depends on the characteristics of the target microorganism and also on the type and value of the end product.

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“…This suggests that novel compounds might be found that could be used as flocculants and that would avoid at least some of the disadvantages of presently used chemical flocculants. One example is the newly described flocculant excreted by cultures of Solibacillus silvestris which has been shown to efficiently flocculate cultures of the marine microalgae Nannochloropsis oceanica and which can be reused (Wan et al 2012). Likewise, a bioflocculant has been isolated from an autofloculating Scenedesmus (Guo et al 2013).…”

Section: Flocculationmentioning

confidence: 99%

Algal biofuels: Challenges and opportunities

Leite

Abdelaziz

Hallenbeck

2013

Bioresource Technology

222

107

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Biodiesel production using microalgae is attractive in a number of respects. Here a number of pros and cons to using microalgae for biofuels production are reviewed. Algal cultivation can be carried out using non-arable land and non-potable water with simple nutrient supply. In addition, algal biomass productivities are much higher than those of vascular plants and the extractable content of lipids that can be usefully converted to biodiesel, triacylglycerols (TAGs) can be much higher than that of the oil seeds now used for first generation biodiesel. On the other hand, practical, cost-effective production of biofuels from microalgae requires that a number of obstacles be overcome. These include the development of low-cost, effective growth systems, efficient and energy saving harvesting techniques, and methods for oil extraction and conversion that are environmentally benign and cost-effective. Promising recent advances in these areas are highlighted.

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Bioflocculant production from Solibacillus silvestris W01 and its application in cost-effective harvest of marine microalga Nannochloropsis oceanica by flocculation

Cited by 157 publications

References 24 publications

Assessment of Bacillus pumilus Isolated from Fresh Water Milieu for Bioflocculant Production

Assessment of Bacillus pumilus Isolated from Fresh Water Milieu for Bioflocculant Production

Harvesting techniques applied to microalgae: A review

Algal biofuels: Challenges and opportunities

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