Life cycle assessment of nutrient remediation and bioenergy production potential from the harvest of hydrilla (Hydrilla verticillata)

Evans, Jason M.; Wilkie, Ann C.

doi:10.1016/j.jenvman.2010.07.040

Cited by 35 publications

(18 citation statements)

References 36 publications

(55 reference statements)

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“…These characteristics give Hydrilla the potential to be employed in habitat restoration efforts or to improve ecosystem services such as water purification (Gu, 2006;Rybicki & Landwehr, 2007;Hershner & Havens, 2008;Dixit & Dhote, 2010;Xue et al, 2010). Moreover, the biomass produced by Hydrilla can yield significant economic benefits through its reclamation, for example, for biogas or fertilizer production (Evans & Wilkie, 2010).…”

Section: Potential Effects On Aquatic Systemsmentioning

confidence: 99%

Hydrilla verticillata (Hydrocharitaceae), a recent invader threatening Brazil’s freshwater environments: a review of the extent of the problem

Sousa

2011

Hydrobiologia

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Hydrilla verticillata (Hydrocharitaceae) is a highly prolific, rooted submerged macrophyte native to Asia that has invaded aquatic systems worldwide, causing many ecological and humanrelated problems. Hydrilla recently invaded the Paraná River basin in Brazil, making other ecologically and socially important Brazilian watersheds more susceptible to invasion by this plant. Here, I summarize the relevant information about Hydrilla, focusing on its biotic attributes, abiotic tolerance and effects on ecosystems. The aim of this review is to provide background information to assist with plan-

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Section: Potential Effects On Aquatic Systemsmentioning

confidence: 99%

Hydrilla verticillata (Hydrocharitaceae), a recent invader threatening Brazil’s freshwater environments: a review of the extent of the problem

Sousa

2011

Hydrobiologia

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“…Hydrilla can help to intercept excessive nutrients and pathogens before they reach the pelagic zone. A comprehensive life cycle analysis (Evans & Wilkie, 2010) of economic cost associated with harvest of Hydrilla and Eichhornia, and their utilisation for compost production needs to be performed.…”

Section: Management Optionsmentioning

confidence: 99%

Regime shift in the littoral ecosystem of volcanic Lake Atitlán in Central America: combined role of stochastic event and invasive plant species

et al. 2018

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Different functional groups of macrophytes vary in their impact on aquatic ecosystem structure and processes. The introduction of new species with different growth form, combined with a stochastic event, may have serious and irreversible consequences on lake functioning. Our goals were to document and explain physical, chemical, metabolic and biotic changes in the littoral zones of a volcanic lake before and following two coinciding events: invasion by a submersed macrophyte, Hydrilla verticillata (Hydrocharitaceae), followed by a rapid increase in the lake water level (>2.5 m). We recorded plant biomass, plant tissue C:N:P stoichiometry, macroinvertebrates, water characteristics data along transects through littoral zones, and measured gas emission in controlled mesocosms and in the lake. The native emergent species, Schoenoplectus californicus (Cyperaceae), was generally not able to survive such a rapid water level increase, and Hydrilla spread and formed dense mats further preventing Schoenoplectus regeneration. The impact of another introduced species, the free‐floating Eichhornia crassipes (Pontederiaceae), was more localised, despite its much longer presence at the lake. Although the three species had comparable standing biomass, the two invader species had lower C:N:P ratios than Schoenoplectus, resulting in faster decomposition rates and indicating potential shifts in nutrient cycling within the ecosystem. The oxygen profile of the water column was altered by the non‐native species in a significantly different manner: in Eichhornia, the saturation concentrations dropped down to 30%–50% of dissolved oxygen, while oxygen supersaturation was recorded in Hydrilla. Both Schoenoplectus and Eichhornia patches exhibited comparable carbon dioxide (CO2) fluxes, sequestering 230 and 300 mg CO2 m−2 hr−1, respectively, during the day and emitting 250 and 200 mg CO2 m−2 hr−1, respectively, during the night. Contrary to these two species, Hydrilla patches sequestered CO2 during the day (34 mg CO2 m−2 hr−1) and night (44 mg CO2 m−2 hr−1). The invasive species maintained a richer community of macroinvertebrates compared to several native species (excluding Schoenoplectus), both in taxa diversity and in numbers of individuals. When the results are considered in the regional context, an increase in nutrient supply could lead to the dominance of free‐floating plants. We discussed management options more broadly considering the negative impacts of introduced species balanced against their beneficial effects, in the context of environmental changes.

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“…No definite results are provided for anaerobic digestion. Another LCA study dealt with invasive seaweeds in a lake 9. This studied system is hardly comparable with ours as it considers seaweed feedstock to be waste, whose harvesting avoids the spread of herbicides in water and artificial cultivation systems.…”

Section: Introductionmentioning

confidence: 96%

“…When compared to terrestrial crops traditionally used for food and feed, the alternative of an algal feedstock for biofuel production seems to be very promising 4–6. In recent years, microalgae have received considerable attention concerning energetic applications,7 whereas few studies have dealt with the environmental impact of marine macroalgae (seaweed) production as feedstock for bioenergy 8,9.…”

Section: Introductionmentioning

confidence: 99%

Life cycle assessment of biomethane from offshore‐cultivated seaweed

Langlois

Sassi

Jard

et al. 2012

Biofuels Bioprod Bioref

103

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Algae are a promising source of industrial biomass for the future. In order to assess if aquacultured seaweed (macroalgae) could be considered an environmentally friendly source of biomass for bioenergy, life cycle assessments were performed for European countries, comparing methane as a biofuel from the anaerobic digestion (A) of whole seaweeds, (B) of alginate extraction residues, and (C) natural gas as a fossil fuel reference. These results clarify that the sources of electricity and energy used to heat the anaerobic digesters have an important impact. Recycling of materials and use of greenhouses at the nursery stage also allow environmental improvements for system (A). Ecodesign can make algal biomethane competitive in several categories compared to natural gas: a decrease of 21.9% and 54.2% in greenhouse gas (GHG) emissions and 58.6% and 68.7% in fossil depletion for systems (A) and (B), respectively, decrease in ozone depletion, and last but not least, improvement in the marine eutrophication index for system (A). For system (B), benefits are more arguable and dependent on the allocation. To conclude, seaweed could become competitive with terrestrial feedstock for biofuel production in the near future. © 2012 Society of Chemical Industry and John Wiley & Sons, Ltd

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Life cycle assessment of nutrient remediation and bioenergy production potential from the harvest of hydrilla (Hydrilla verticillata)

Cited by 35 publications

References 36 publications

Hydrilla verticillata (Hydrocharitaceae), a recent invader threatening Brazil’s freshwater environments: a review of the extent of the problem

Hydrilla verticillata (Hydrocharitaceae), a recent invader threatening Brazil’s freshwater environments: a review of the extent of the problem

Regime shift in the littoral ecosystem of volcanic Lake Atitlán in Central America: combined role of stochastic event and invasive plant species

Life cycle assessment of biomethane from offshore‐cultivated seaweed

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