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Chlorococcum

About: Chlorococcum is a research topic. Over the lifetime, 268 publications have been published within this topic receiving 7317 citations.


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Journal ArticleDOI
TL;DR: Experimental results indicated that NH4-N, NO3-n, PO4-P and chemical oxygen demand (COD) removal efficiencies were found to be 68.6%, 74%, 71.5% and 90.2%, respectively, in secondary treated sewage, soak liquor and composite tannery effluent.
Abstract: In this study, potential microalgae species (Chlorella vulgaris, Scenedesmus dimorphus, Chlorococcum sp. and Chlamydomonas sp.) have been studied for nutrient removal from synthetic and industrial wastewater. Batch experiments were carried out to investigate the removal performance among four chosen species at different nitrogen and phosphorus concentrations. NH4-N and PO4-P were varied from 13.2 to 52.8 mg/L and 6.6 to 26.4 mg/L, respectively, by keeping N:P ratio as 2:1. In synthetic wastewater, maximum NH4-N and PO4-P removal efficiencies of 88.6% and 91.2% were obtained with C. vulgaris when compared to the other microalgae studied. Further studies were carried out using C. vulgaris in batch experiments to investigate the nutrient removal performance in secondary treated sewage, soak liquor and composite tannery effluent. Experimental results indicated that NH4-N, NO3-N, PO4-P and chemical oxygen demand (COD) removal efficiencies were found to be 68.6%, 74%, 71.5% and 90.2%, respectively, in s...

14 citations

Journal ArticleDOI
Junping Lv1, Xuechun Wang1, Wei Liu1, Jia Feng1, Qi Liu1, Fangru Nan1, Xiaoyan Jiao, Shulian Xie1 
TL;DR: The integration of flocculation, biomass production, wastewater treatment, and lipid accumulation, simultaneously, made Chlorococcum sp.
Abstract: The performance of a self-flocculating microalga Chlorococcum sp. GD on the flocculation, growth, and lipid accumulation in wastewater with different ammonia nitrogen concentrations was investigated. It was revealed that relative high ammonia nitrogen concentration (20–50 mg·L−1) was beneficial to the flocculation of Chlorococcum sp. GD, and the highest flocculating efficiency was up to 84.4%. It was also found that the highest flocculating efficiency occurred in the middle of the culture (4–5 days) regardless of initial ammonia concentration in wastewater. It was speculated that high flocculating efficiency was likely related to the production of extracellular proteins. 20 mg·L−1 of ammonia was found to be a preferred concentration for both biomass production and lipid accumulation. 92.8% COD, 98.8% ammonia, and 69.4% phosphorus were removed when Chlorococcum sp. GD was cultivated in wastewater with 20 mg·L−1 ammonia. The novelty and significance of the investigation was the integration of flocculation, biomass production, wastewater treatment, and lipid accumulation, simultaneously, which made Chlorococcum sp. GD a potential candidate for wastewater treatment and biodiesel production if harvested in wastewater with suitable ammonia nitrogen concentration.

14 citations

Journal ArticleDOI
TL;DR: The present study supports the possibility that in the natural environment P. blanci feeds regularly on the toxic strain of Microcystis aeruginosa and also on small ciliates, both common in its habitat.
Abstract: I studied the effects of different food types on the postembryonic (naupliar and copepodite) developmental rates and adult demographic parameters (longevity, egg-laying age and fecundity) of Phyllodiaptomus blanci, a common calanoid copepod in the lakes and ponds of India. The test diets, all cultured in the laboratory, included bacteria (Klebsiella aerogenes), cyanobacteria (Microcystis aeruginosa), green algae (Chlorella vulgaris, Scenedesmus acutus, Chlorococcum himocolo and Chlorogonium elongatum), a chrysophyte (Ophiocytium capitatum), a ciliate (Tetrahymena pyriformis) and a mixed diet of ciliates and Scenedesmus. All experiments were started with the N 1 naupliar stage of P blanci cultured in the laboratory. With the bacterial diet, postembryonic development was incomplete and adults failed to reproduce. With a diet of Microcystis aeruginosa, the development was complete but required longer time and the adults reproduced with a lower net reproductive rate than with algal diets. Among the algal diets, Chlorogonium and Chlorococcum contributed to the fastest postembryonic development and the highest reproductive rates. P. bland was able to complete its naupliar development and also to reproduce on a diet of the smaller algae Chlorella and Scenedesmus, but only when these diets were nutritionally enriched. Its performance on a diet of the chrysophyte Ophiocytium was marginally higher than with Microcystis aeruginosa but significantly lower than on a diet of the green algae. The calanoid was not only able to utilize the ciliate Tetrahymena as food but also achieved postembryonic developmental rates and reproductive output comparable to those achieved with green algal diets. The present study supports the possibility that in the natural environment P. blanci feeds regularly on the toxic strain of Microcystis aeruginosa and also on small ciliates, both common in its habitat.

14 citations

Journal ArticleDOI
TL;DR: In this paper, Mn-promoted nickel-based catalysts were explored for the direct hydrogenation of microalgae (Chlorococcum sp.) containing 49.6% of carbohydrates in water.
Abstract: Mn-promoted nickel-based catalysts were explored for the direct hydrogenation of microalgae (Chlorococcum sp.) containing 49.6% of carbohydrates in water. With this catalyst at 250 °C for 3.0 h, microalgae was completely decomposed, where the conversion of microalgae to liquid products (CTL) and the total yield of polyols reached 66.9%, and 53.6%, respectively. Among polyols, the total yield of 1,2-propanediol and ethylene glycol were 41.7%. XRD, XPS and TEM-EDX characterizations showed that 5% of Mn addition, 350 °C of reduction temperature and the co-precipitation synthesis ensured the excellent dispersion of the Ni catalyst with small particle sizes. The Mn promoter was found to stabilize the catalyst structure by preventing the Ni particles from aggregation and to effectively promote retro-aldol and dehydroxylation reaction due to the increasing number of Lewis acid sites. Meanwhile, the hydrogenation pathways over nickel-based catalysts were proposed.

13 citations

Journal ArticleDOI
TL;DR: Overall, this free-living Chlorococcum amblystomatis strain shows great potential for nutritional applications, coupling a promising growth performance with a high protein content as well as relevant amounts of PUFAs, chlorophyll, and carotenoids.
Abstract: Bioprospection of novel autochthonous strains is key to the successful industrial-scale production of microalgal biomass. A novel Chlorococcum strain was recently isolated from a pond inside the industrial production facility of Allmicroalgae (Leiria, Portugal). Phylogenetic analysis based on 18S ribosomal ribonucleic acid (rRNA) gene sequences suggests that this isolate is a novel, free-living Oophila amblystomatis strain. However, as our phylogenetic data strongly suggests that the aforementioned taxon belongs to the genus Chlorococcum, it is here proposed to rename this species as Chlorococcum amblystomatis. In order to characterize the biotechnological potential of this novel isolate, growth performance and biochemical composition were evaluated from the pilot (2.5-m3) to industrial (10-m3) scale. The highest maximum areal productivity (36.56 g·m−2·day−1) was reached in a 10-m3 tubular photobioreactor (PBR), as compared to that obtained in a 2.5-m3 PBR (26.75 g·m−2·day−1). Chlorococcum amblystomatis displayed high protein content (48%–56% dry weight (DW)) and moderate levels of total lipids (18%–31% DW), carbohydrates (6%–18% DW) and ashes (9%–16% DW). Furthermore, the lipid profile was dominated by polyunsaturated fatty acids (PUFAs). The highest pigment contents were obtained in the 2.5-m3 PBR, where total chlorophylls accounted for 40.24 mg·g−1 DW, followed by lutein with 5.37 mg·g−1 DW. Overall, this free-living Chlorococcum amblystomatis strain shows great potential for nutritional applications, coupling a promising growth performance with a high protein content as well as relevant amounts of PUFAs, chlorophyll, and carotenoids.

13 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20221
202121
202013
201923
201812
201714