Nitrogen budget in Scenedesmus obliquus cultures with artificial wastewater

Nuñez, Vı́ctor J; Voltolina, Doménico; Nieves, Marío; Piña, Pablo; Medina, Alejandra; Guerrero, M. A.

doi:10.1016/s0960-8524(00)00183-8

Cited by 44 publications

(17 citation statements)

References 8 publications

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“…This fact has been already observed by Voltolina et al (1998Voltolina et al ( , 2005, Nuñez et al (2001) and by Tam and Wong (1996). The latter authors found that the residual NH 4 -N in cultures of C. vulgaris was <5% of the initial amount when the initial amount of NH 4 -N was lower than 80 mg L −1 .…”

Section: Nitrogen and Phosphorus Removalsupporting

confidence: 73%

“…Moreover, since ammonia is mostly present in the ionised form below pH 8.0, the risk of ammonia of being toxic to the cultures was prevented (Abeliovich and Azov 1976;). According to Voltolina et al (1998Voltolina et al ( , 2005 and Nuñez et al (2001), only 25-33% of the initial NH 4 -N content was recycled in the protein biomass by cultures of S. obliquus, whilst the largest part was lost (presumably as ammonia gas to the atmosphere) as a result of the combined effect of the high pH values of the culture and of the aeration. In our study, the amount of N recycled in the biomass was considerably higher than that reported in the literature, with up to 80% of which was removed.…”

Section: Nitrogen and Phosphorus Removalmentioning

confidence: 99%

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Nitrogen and phosphorus removal through laboratory batch cultures of microalga Chlorella vulgaris and cyanobacterium Planktothrix isothrix grown as monoalgal and as co-cultures

2011

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Batch cultures of the green microalga Chlorella vulgaris and cyanobacterium Planktothrix isothrix and their corresponding co-cultures were grown in municipal wastewater in order to study their growth as well as the nitrogen (NH 4 -N) and phosphorus (PO 4 3− -P) removal. The cultures were grown under two irradiances of 20 and 60 μmol photons m −2 s −1 in shaken and unshaken conditions. The co-culture of unshaken Chlorella and Planktothrix showed the greatest growth under both irradiances. The monoalgal Planktotrix cultures showed better growth when unshaken than when shaken, whereas Chlorella cultures grew better when mixed, but only at the higher irradiance. The highest percentage of nitrogen removal (up to 80%) was attained by the unshaken co-cultures of Chlorella and Planktothrix. The amount of nitrogen recycled in the biomass reached up to 85% of that removed. Shaken monoalgal cultures of Chlorella showed phosphorus removal under both irradiances. They completely removed the initial phosphorus concentration (7.47±0.17 mg L −1 ) within 96 and 48 h under 20 and 60 μmol photons m −2 s −1 , respectively.

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Section: Nitrogen and Phosphorus Removalsupporting

confidence: 73%

Section: Nitrogen and Phosphorus Removalmentioning

confidence: 99%

Nitrogen and phosphorus removal through laboratory batch cultures of microalga Chlorella vulgaris and cyanobacterium Planktothrix isothrix grown as monoalgal and as co-cultures

2011

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“…These values were chosen because they were similar to the composition of secondary effluents of some wastewater treatment plants reported before (Martínez et al 2000;Nuñez et al 2001;Voltolina et al 2005). The pH value of the synthetic wastewater was adjusted to 7.3-7.4.…”

Section: Wastewatermentioning

confidence: 99%

Removal of nitrogen and phosphorus from wastewater using microalgae immobilized on twin layers: an experimental study

2007

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Removal of nitrogen and phosphorus from wastewater by two green microalgae (Chlorella vulgaris and Scenedesmus rubescens) was investigated using a novel method of algal cell immobilization, the twin-layer system. In the twin-layer system, microalgae are immobilized by self-adhesion on a wet, microporous, ultrathin substrate (the substrate layer). Subtending the substrate layer, a second layer, consisting of a macroporous fibrous tissue (the source layer), provides the growth medium. Twin-layers effectively separate microalgae from the bulk of their growth medium, yet allow diffusion of nutrients. In the twin-layer system, algae remain 100% immobilized, which compares favourably with gel entrapment methods for cell immobilization. Both microalgae removed nitrate efficiently from municipal wastewater. Using secondary, synthetic wastewater, the two algae also removed phosphate, ammonium and nitrate to less than 10% of their initial concentration within 9 days. It is concluded that immobilization of C. vulgaris and S. rubescens on twin-layers is an effective means to reduce nitrogen and phosphorus levels in wastewater.

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“…According to the authors, the presence of ammonium predominates at pH below 8.0, but, with increasing pH, ammonia levels increase, which acts as an inhibitor of photosynthesis and microalga growth. According to Nuñez et al (2001), between 25-33% of the initial ammonium was used by the Scenedesmus obliquus microalgae, assuming that the majority was lost as gas to the atmosphere and resulting from the combination of high pH values and aeration of the culture. Benavides & Torzillo (2012) cultivated Chlorella vulgaris with a pH close to 7 and obtained an ammonium use by the microalga of 85%, reducing losses by volatilization (15%).…”

Section: Resultsmentioning

confidence: 99%

OUTDOOR CULTIVATION OF Scenedesmus obliquus BR003 IN STIRRED TANKS BY AIRLIFT

et al. 2017

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ABSTRACT:The use of microalgae as a source of raw material for biofuel production has been highly targeted. Compared to other biological options for the capture and use of CO2, microalgae crops have the following advantages: high productivity, lack of competition with feed and foodbased products, use of unproductive and non-arable land, and allowance of the use of wastewater for its cultivation. The use of wastewater from industrial, agricultural, and domestic sewage has been indicated as an alternative means to reduce the cost of crops, since such waste is generally released into the environment without previous treatment. This work addresses the use of petrochemical wastewater (ARP) from effluent produced at the Gabriel Passos Refinery (Petrobrás refinery unit) for the cultivation of a strain of Scenedesmus obliquus BR003. Twelve experimental units of 20 L each were constructed in the experimental area of the Biofuel Laboratory of the Federal University of Viçosa, Minas Gerais, Brazil in an uncontrolled environment, and the cultures were evaluated by quantification of total carbohydrates, total lipids, dry biomass, and growth evaluated by absorbance. The results showed that the wastewater from petrochemical effluent is an efficient growth medium for the growth of Scenedesmus obliquus BR003 microalgae for large-scale cultivation on land that is not suitable for other agricultural crops.

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Nitrogen budget in Scenedesmus obliquus cultures with artificial wastewater

Cited by 44 publications

References 8 publications

Nitrogen and phosphorus removal through laboratory batch cultures of microalga Chlorella vulgaris and cyanobacterium Planktothrix isothrix grown as monoalgal and as co-cultures

Nitrogen and phosphorus removal through laboratory batch cultures of microalga Chlorella vulgaris and cyanobacterium Planktothrix isothrix grown as monoalgal and as co-cultures

Removal of nitrogen and phosphorus from wastewater using microalgae immobilized on twin layers: an experimental study

OUTDOOR CULTIVATION OF Scenedesmus obliquus BR003 IN STIRRED TANKS BY AIRLIFT

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