CRIS
Permanent URI for this communityhttps://cris.ute.edu.ec/handle/123456789/1
Browse
5 results
Search Results
Now showing 1 - 5 of 5
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Sustainable valorization of leachate at Lakhodair landfill, Lahore: An integrated life cycle environmental and economic assessment of biogas productionThe rapid growth of the human population has led to a significant increase in municipal solid waste (MSW), which is projected to reach 2.2 billion tons per year by the end of 2025. This has caused a problem with landfill leachate. Biogas production from landfill leachate offers a sustainable solution to mitigate environmental issues, including greenhouse gas emissions and groundwater contamination, while recovering clean energy and valuable resources from waste. This study simulates and assesses the environmental and economic benefits of biogas production from leachate using a life-cycle assessment (LCA) framework. The environmental impacts were evaluated using the LCA methodology and the ReCiPe 2016 midpoint (H) approach, which comprises 18 different environmental categories. Midpoint results revealed that terrestrial eco-toxicity, climate change, and fossil depletion were the main impact categories that potentially contributed to 3.63 × 101 kg 1,4-DB eq., 5.37 × 102 kg CO2 eq., and 1.83 × 101 kg oil eq., respectively, for 1 m3 of biogas production. Scenario modeling was performed by replacing the power source with a solar cell rather than grid electricity. Shifting to solar energy resulted in a GWP of 535 kg CO2 equivalent and an FDP of 18 kg oil equivalent per m3 of biogas production. Sensitivity and uncertainty analyses were conducted to evaluate environmental performance, with electricity and other inputs identified as key drivers of environmental impact. Financial analysis of 1300 m3 biogas plant reveals strong economic performance, with annual revenue of USD 651,495.98 and operational expenditures of USD 541,352.98. The project's profitability is underscored by a 2-year payback period, a positive NPV of 6,372,112.71, and an IRR of 34.53 %. While external costs, including USD 15.75 per m3 for emissions management, are notable, the environmental benefits of reduced leachate problems and electricity generation support the project's viability. This study provides policymakers, waste management practitioners, and stakeholders with valuable insights into reducing environmental impacts while increasing resource recovery from waste streams. This research aligns with several United Nations Sustainable Development Goals (SDGs), including SDG 6, 7, 11, 14, and 15, by advancing clean energy, promoting economic growth, fostering sustainable communities, and enhancing environmental protection. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Advancing sustainable bioethanol production from organic waste by integrating life cycle modeling(Elsevier BV, 2025-12) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Navigating green synthesized metal-based nanoparticles as anti-inflammatory agent – Comprehensive review(Elsevier BV, 2025-02-10) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Island ecosystems unleashed: rain gardens transforming flood management in Galápagos(Informa UK Limited, 2025-12-31); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Organic zinc sources in broiler production at high altitude under on-top supplementation or total or partial replacement: 1. Effects on performance and zinc excretionFeeding broilers with organic chemical sources of Zn has recently been recommended to improve performance, immune system, carcass yield, and reduce environmental contamination. However, its use under proposed supplementation strategies (i.e., total replacement, partial replacement, on-top) needs further investigation. This study assessed the effect of total replacement, partial replacement, and on-top supplementation strategies to feed organic Zn sources and the effect of two organic chemical forms on performance and Zn excretion in broilers at high altitudes. Twenty-two male Cobb 500-day-old chicks were placed in each of 54 floor pens and raised for up to 42 days under a three-phase feeding program and following the Ecuadorian highland production system. Pens were assigned to one of nine experimental treatments consisting of a basal diet supplemented with 0, 33, and 100 ppm of Zn from ZnSO4 and added or not 40 ppm Zn from Zn proteinate or Zn amino acid complex. A Completely Randomized Block Design was considered, being the block the replication. The Zn concentration of the basal diet was determined. Feed intake, BW, BW gain, feed conversion ratio, and European Production Efficiency Factor were assessed at 21 and 42 days of age, and the Zn excretion was estimated accordingly. Each supplementation strategy was compared with the standard practice (100 ppm Zn as ZnSO4) using contrasts and mixed models, and the interaction with the chemical form was assessed considering the P-values of the ANOVA and the multiple comparisons between the corresponding treatments. The effects of the organic Zn forms and their interactions with the dietary Zn level were assessed considering the responses were linear functions of the organic Zn source, the feed intake, the Zn intake, the Zn supplementation level, and the block, as corresponding. None of the strategies to supplement a Zn organic source, or the organic sources themselves, showed overall detectable effects on performance. However, interactions were observed between the supplementation strategy and the organic Zn source and between the organic source and the dietary Zn levels or the Zn intake. Under the on-top supplementation strategy, the Zn organic sources showed different feed conversion ratios at 21 days. In addition, totally or partially replacing the ZnSO4 with a Zn organic form reduced the Zn excretion. In conclusion, although no overall effect of the supplementation strategies was detected, the assessed organic Zn forms showed different effects on the feed conversion ratio at 21 days.