3. Producción

Browse

Settings

Has files: NoSubject: search.filters.subject.life cycle assessment

Search Results

Now showing 1 - 2 of 2
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Environmental and Energy Sustainability in Wastewater Transportation: Integration of ISO 50001 and ISO 14040/14044 in the Replacement of Diesel with Compressed Natural Gas, Lima, Peru
    (Multidisciplinary Digital Publishing Institute (MDPI), 2026-08-01)
    Evidence combining energy management and life cycle assessment of diesel-to-CNG substitution under real fleet operation remains limited. The energy and environmental assessments were jointly applied over a common functional unit—the transport of 30 m3 of non-hazardous wastewater per documented service—with an annual reference flow of 82,422 m3·km derived from 38 services (1140 m3; 5905.2 km) in Lima, Peru. A single primary dataset fed both the energy baseline (characteristic monthly consumption of 22,828 ± 1435 MJ month−1; service-level intensities of (Formula presented.) vs. (Formula presented.) MJ (m3·km)−1, (Formula presented.), (Formula presented.)) and the life cycle inventory, assessed in SimaPro v9.6.0.1 (ReCiPe 2016 Midpoint (H)) under an extended tank-to-wheel boundary with Pedigree–Monte Carlo uncertainty propagation. The transition—fuel substitution combined with Euro V-to-Euro VI platform renewal—reduced energy intensity by 45.3% and direct-combustion GWP100 by 61.1%; this integrated effect is not attributable to the fuel change alone. Methane slip contributed 1.3% of the CNG GWP100, and only an upstream leakage of 15.5% of the delivered gas would cancel the climate benefit. Tire replacement remained the dominant hotspot (64.5%/51.7%); immediate 30-vehicle fleet conversion would avoid 2530 t CO2-eq over ten years.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Circular Recovery of Organic Waste from Mining Canteens for the Production of Biofertilizers: Life Cycle Assessment and Circularity Indicators in High-Andean Regions
    (Multidisciplinary Digital Publishing Institute (MDPI), 2026-08-01)
    The management of organic waste in high-altitude mining poses a distinctive circularity challenge: waste is generated at sites decoupled from agricultural systems, while the same operations are legally required to revegetate the land they disturb. This study provides, to the best of our knowledge, the first primary-data environmental characterization of a real system that valorizes dining-facility organic waste from a high-altitude mining unit in northern Peru into a solid biofertilizer and a liquid biol, both applied in situ for land reclamation. Unlike methanogenic digesters, the system operates under a lactic (acidogenic) fermentation regime inoculated with effective microorganisms and does not recover biogas. A cradle-to-gate life cycle assessment (ISO 14040/14044) with Monte Carlo uncertainty propagation was combined with a well-established family of five circular economy indicators, adapted to the non-energy-recovery case by redefining the Energy Self-Sufficiency Ratio (ESSR) and the Decarbonization Circularity Indicator (DCI). The principal contribution is methodological: the framework is extended to a circularity archetype that previous, biogas-centered formulations could not represent, showing that a system can close its material and nutrient loops robustly (WVI = 0.97) while the energy loop is absent by design (ESSR = 0). The climate result is conditional and is a first-order greenhouse-gas (GHG) screening balance, not a physical carbon-sequestration claim: under the upper-bound assumption of full fertilizer substitution, the avoided fertilizer credit outweighs non-methane process emissions only below a narrow fugitive-methane threshold (≈0.32 kg CH4 per ton), a margin that narrows further once agronomic equivalence is discounted. The measured product acidity suggests that this condition is plausible, but, because methane was not measured directly, the low-emission interpretation is presented as a hypothesis requiring confirmation rather than as a demonstrated result. The environmental burden is driven by material and electricity inputs—chiefly the polypropylene containers and grid electricity—rather than by the biological process, which broadens the set of improvement priorities beyond methane management to include capital-good reuse and electricity decarbonization, without implying that methane can be neglected.