Granular activated algae for wastewater treatment

Tiron, Olga; Bumbac, Costel; Patroescu, Viorel; Badescu, Valeriu Robert; Postolache, Carmen

doi:10.2166/wst.2015.010

Cited by 57 publications

(36 citation statements)

References 26 publications

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“…Compared with fungi-algae pellets, the activated algae granules were developed at common pH values registered during conventional wastewater treatment processes (pH 6.5–8.5). Moreover, our previous investigations showed a high tolerance of granule structure at higher variations of pH (5–8.5) 24 . Such properties sustain the feasible character of the activated algae granules for further application in wastewater treatment processes.…”

Section: Resultsmentioning

confidence: 76%

“…The viability of the developed activated algae granules in wastewater treatment processes have been proven in our previous research 24 where the symbiotic relationship developed between bacteria and microalgae inside the granular structure contributed to: (1) almost complete removal of organic matter, using only the oxygen provided through photosynthesis processes; (2) the complete removal of ammonium, with the performance promoted through cell assimilation and nitrification processes; and (3) the occurrence of the denitrification processes sustained by the variation of oxygen saturation during the conducted treatment batches and possibly by the dense granular structure. In addition to the role of the Phormidium sp.…”

Section: Resultsmentioning

confidence: 89%

“…The PBR was fed with pretreated dairy wastewater, as with the activated algae flocs development. The set-up operational conditions during granulation were detailed in our previous study 24 . Hydraulic retention time was decreased successively from 96 to 72, 48, and 24 h based on treatment performance.…”

Section: Methodsmentioning

confidence: 99%

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Overcoming Microalgae Harvesting Barrier by Activated Algae Granules

Tiron

Bumbac

Manea

et al. 2017

Sci Rep

101

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The economic factor of the microalgae harvesting step acts as a barrier to scaling up microalgae-based technology designed for wastewater treatment. In view of that, this study presents an alternative microalgae-bacteria system, which is proposed for eliminating the economic obstacle. Instead of the microalgae-bacteria (activated algae) flocs, the study aimed to develop activated algae granules comprising the microalgae Chlorella sp. as a target species. The presence of the filamentous microalgae (Phormidium sp.) was necessary for the occurrence of the granulation processes. A progressive decrease in frequency of the free Chlorella sp. cells was achieved once with the development of the activated algae granules as a result of the target microalgae being captured in the dense and tangled network of filaments. The mature activated algae granules ranged between 600 and 2,000 µm, and were characterized by a compact structure and significant settling ability (21.6 ± 0.9 m/h). In relation to the main aim of this study, a microalgae recovery efficiency of higher than 99% was achieved only by fast sedimentation of the granules; this performance highlighted the viability of the granular activated algae system for sustaining a microalgae harvesting procedure with neither cost nor energy inputs.

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Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 89%

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Overcoming Microalgae Harvesting Barrier by Activated Algae Granules

Tiron

Bumbac

Manea

et al. 2017

Sci Rep

101

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“…Pharmaceutical compounds ussualy present a complex structure and can not be properly treated using conventional wastewater treatment processes (Zhang et al 2013;Tiron et al 2015). Cytostatics drugs residues were found in hospital wastewater discharges in concentrations up to µg/L (Mahnik et al 2007;Kovalova et al 2009;Mullot et al 2009).…”

Section: Introductionmentioning

confidence: 99%

INFLUENCE OF TiO2 DOPANT TYPE UPON CYCLOPHOSPHAMIDE DEGRADATION EFFICIENCY

Constantin¹,

Constantin²,

Cristea³

et al. 2017

Simi 2017

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The influence of various dopant types like S, Fe, Co, Ni (5% wt.) in the photocatalytic degradation of cyclophosphamide under UV-VIS irradiation was investigated. The working conditions were as follows: irradiation time up to 270 minutes, photo catalyst dose 100 mg/L, initial pollutant concentration 19.15 mg/L. Pollutant degradation was found to follow a pseudo first order kinetic. CP degradation rate constants decreases in the following order kFe-TiO2 > kNi-TiO2 > kCo-TiO2 > kS-TiO2 > kTiO2, which was also in accordance with chlorine mineralization rate constants.

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“…For each P450, its scaffold number, DNA strand and number of introns lutionary history of earth and became major players in global energy / biomass production and biogeochemical recycling (Grossman 2005, Blanc et al 2010. Among algae, research on microalgae has been intensified because of their enormous biotechnological potential, including generation of biofuels (Behera et al 2015), phytochemicals (De Jesus Raposo and De Morais 2015), cosmetics (Wang et al 2015) and vaccines (Specht and Mayfield 2014) and their use in wastewater treatment (Tiron et al 2015). Microalgae are also used as biomarkers for organic and inorganic pollution (Torres et al 2008).…”

mentioning

confidence: 99%

Cytochrome P450 monooxygenase analysis in free-living and symbiotic microalgae Coccomyxa sp. C-169 and Chlorella sp. NC64A

Mthakathi¹,

Kgosiemang²,

Chen³

et al. 2015

ALGAE

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Microalgae research is gaining momentum because of their potential biotechnological applications, including the generation of biofuels. Genome sequencing analysis of two model microalgal species, polar free-living Coccomyxa sp. C-169 and symbiotic Chlorella sp. NC64A, revealed insights into the factors responsible for their lifestyle and unravelled biotechnologically valuable proteins. However, genome sequence analysis under-explored cytochrome P450 monooxygenases (P450s), heme-thiolate proteins ubiquitously present in species belonging to different biological kingdoms. In this study we performed genome data-mining, annotation and comparative analysis of P450s in these two model algal species. Sixty-nine P450s were found in two algal species. Coccomyxa sp. showed 40 P450s and Chlorella sp. showed 29 P450s in their genome. Sixty-eight P450s (>100 amino acid in length) were grouped into 32 P450 families and 46 P450 subfamilies. Among the P450 families, 27 P450 families were novel and not found in other biological kingdoms. The new P450 families are CYP745-CYP747, CYP845-CYP863, and CYP904-CYP908. Five P450 families, CYP51, CYP97, CYP710, CYP745, and CYP746, were commonly found between two algal species and 16 and 11 P450 families were unique to Coccomyxa sp. and Chlorella sp. Synteny analysis and gene-structure analysis revealed P450 duplications in both species. Functional analysis based on homolog P450s suggested that CYP51 and CYP710 family members are involved in membrane ergosterol biosynthesis. CYP55 and CYP97 family members are involved in nitric oxide reduction and biosynthesis of carotenoids. This is the first report on comparative analysis of P450s in the microalgal species Coccomyxa sp. C-169 and Chlorella sp. NC64A.Key Words: carotenoid biosynthesis; Chlorella sp. NC64A; Coccomyxa sp. C-169; cytochrome P450 monooxygenases; nitric oxide reductase; P450nor; symbiosis INTRODUCTIONGreen algae belonging to the phylum Chlorophyta consist of microorganisms adapted to diverse ecological niches. Green algae are photosynthetic in nature and it is estimated that more than one billion years ago terrestrial plants emerged from these organisms (Heckman et al. 2001). These organisms played a key role during the evoReceived April 3, 2015, Accepted July 6, 2015 *Corresponding Author E-mail: khajamohiddinsyed@gmail.com Tel: This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. 234 MATERIALS AND METHODSThe genomes of Coccomyxa sp. C-169 and Chlorella sp. NC64A have been sequenced and their genome sequence data are available for public use (Blanc et al. 2010(Blanc et al. , 2012. Genome data mining of P450s in the two species was carried out as described elsewhere (Kgosiemang et al. 2014. Briefly, the proteomes of these species were downloaded from the respective databases...

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Granular activated algae for wastewater treatment

Cited by 57 publications

References 26 publications

Overcoming Microalgae Harvesting Barrier by Activated Algae Granules

Overcoming Microalgae Harvesting Barrier by Activated Algae Granules

INFLUENCE OF TiO2 DOPANT TYPE UPON CYCLOPHOSPHAMIDE DEGRADATION EFFICIENCY

Cytochrome P450 monooxygenase analysis in free-living and symbiotic microalgae Coccomyxa sp. C-169 and Chlorella sp. NC64A

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