Nitrogen recycling and methane production using Gracilaria tikvahiae: A closed system approach

Habig, Clifford; Andrews, David A.; Ryther, John H.

doi:10.1016/0166-3097(84)90023-3

Cited by 12 publications

(4 citation statements)

References 7 publications

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“…Given this expense, recycling of nutrients is probably a necessity for extensive algal cultivation (Goldman & Ryther, 1977 ;Oswald & Benemann, 1977) . Non-conventional sources, including wastewater (e .g ., Goldman et al, 1974aGoldman et al, , 1974bRyther et al, 1975Ryther, 1977) and fermentation residues (e .g ., Hanisak, 1981, Habig et al, 1984b, should be used whenever possible ; not only are such sources inexpensive, but their utilization may simultaneously alleviate an expensive waste disposal problem .…”

Section: Discussionmentioning

confidence: 99%

The use of Gracilaria tikvahiae (Gracilariales, Rhodophyta) as a model system to understand the nitrogen nutrition of cultured seaweeds

Hanisak

1990

Hydrobiologia

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Seaweeds have physiological mechanisms to acquire, utilize, and store various forms of nitrogen in environments where nitrogen levels vary tremendously in space and time . Knowledge of the nitrogen relationships of seaweeds is required for the development of successful seaweed mariculture . For example, it would seem at first that continuous nitrogen enrichment would be desirable in such systems because maximal seaweed yields are possible only when growth is not nitrogen-limited . Yet such fertilization is wasteful and can result in yield reductions due to the enhancement of epiphyte growth . Because most seaweeds can rapidly taken up high concentrations of nitrogen, far in excess of what is required for current growth demands, enrichments are needed only when internal nitrogen concentrations fall to near the critical level (i .e ., the minimal tissue concentration of nitrogen required for maximal growth) . Nutrients are best applied at brief pulses of high nitrogen concentrations .

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Section: Discussionmentioning

confidence: 99%

The use of Gracilaria tikvahiae (Gracilariales, Rhodophyta) as a model system to understand the nitrogen nutrition of cultured seaweeds

Hanisak

1990

Hydrobiologia

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“…Previous nitrogen recycling research efforts have included coupling algal growth with wastewater treatment (Pittman et al, 2011;Sacristan de Alva et al, 2013), and using the aqueous phase from hydrothermal liquefaction (HTL) as a biomass fertilizer (Biller et al, 2012;Garcia Alba et al, 2013). Recycling nutrients from methane digesters has also been investigated (Golueke and Oswald, 1959;Habig et al, 1984). In this study, it was assessed whether the nitrogen remaining in algal fermentation residues, generated after lipid extraction and then carbohydrate fermentation (Gao et al, 2012;Harun et al, 2010), could be effectively recycled and used to supplement, or even replace, nitrate addition to culture media.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen recycling from fuel-extracted algal biomass: Residuals as the sole nitrogen source for culturing Scenedesmus acutus

Nagle

Pienkos

et al. 2015

Bioresource Technology

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In this study, the reuse of nitrogen from fuel-extracted algal residues was investigated. The alga Scenedesmus acutus was found to be able to assimilate nitrogen contained in amino acids, yeast extracts, and proteinaceous alga residuals. Moreover, these alternative nitrogen resources could replace nitrate in culturing media. The ability of S. acutus to utilize the nitrogen remaining in processed algal biomass was unique among the promising biofuel strains tested. This alga was leveraged in a recycling approach where nitrogen is recovered from algal biomass residuals that remain after lipids are extracted and carbohydrates are fermented to ethanol. The protein-rich residuals not only provided an effective nitrogen resource, but also contributed to a carbon "heterotrophic boost" in subsequent culturing, improving overall biomass and lipid yields relative to the control medium with only nitrate. Prior treatment of the algal residues with Diaion HP20 resin was required to remove compounds inhibitory to algal growth.

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“…Biogas yield in the high salinity system peaked at approximately 100 ml biogas per gram VS at an OLR of 1.5 g VS * L −1 * d −1 . For comparison, Bird et al [37] reported a specific yield of biogas from fresh Sargassum fluitans of 200 ml per g VS * L −1 * d −1 , while [38] reported findings of more than 400 ml of CH 4 (∼ 800 ml of biogas) per gram VS fed per L * d when fresh Ulva spp. or Gracilaria spp.…”

Section: Resultsmentioning

confidence: 99%

Functional Metagenomics Characterization of an Anaerobic Saltwater Bioreactor

Derilus¹,

Forestil²,

Fortuné³

et al. 2019

Journal of Renewable Energy

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Methanogens are restricted to a few genera of Archaea, however they have great importance in the carbon cycle, impacting climactic considerations, and also find a role in renewable energy in the form of biogas. Here, we examine the microbial contribution to the production of methane in a sargassum fed anaerobic saltwater bioreactor, which are poorly characterized compared to fresh water bioreactors, using a comprehensive functional metagenomics approach. Despite abundant production of methane, we detected a low proportion of Archaea in the system using 16S rRNA community profile analyses. We address the low representation using an additional 16S rRNA analysis of shotgun data and a consideration of CO2:CH4 production. Using a novel network alignment and tree building approach, we measured similarity between the meta-metabolic capabilities of different anaerobic microbial communities. The saltwater bioreactor samples clustered together, validating the approach and providing a method of determining meta-metabolic similarity between microbial communities, with a range of potential applications. We also introduce a number of additional approaches for examining and interpreting meta-metabolic network topology. The low abundance of methanogens appears as a common property of such anaerobic systems and likely reflects the relatively poor energetics of methanogens, while examination of key enzymes confirms that hydrogen producing bacteria are the major fermentative guild. Our results indicate that the use of readily available seawater and marine macroalgae is a promising approach to the production of biogas as a source of renewable energy.

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Nitrogen recycling and methane production using Gracilaria tikvahiae: A closed system approach

Cited by 12 publications

References 7 publications

The use of Gracilaria tikvahiae (Gracilariales, Rhodophyta) as a model system to understand the nitrogen nutrition of cultured seaweeds

The use of Gracilaria tikvahiae (Gracilariales, Rhodophyta) as a model system to understand the nitrogen nutrition of cultured seaweeds

Nitrogen recycling from fuel-extracted algal biomass: Residuals as the sole nitrogen source for culturing Scenedesmus acutus

Functional Metagenomics Characterization of an Anaerobic Saltwater Bioreactor

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