Banca de DEFESA: RAFAELLA DE MOURA MEDEIROS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RAFAELLA DE MOURA MEDEIROS
DATE: 14/06/2023
TIME: 08:00
LOCAL: Pós-Graduação Engenharia Civil
TITLE:

Influence of the Use of Organic Compost on the Geotechnical Properties of Coverage Layers of Final Solid Waste Disposal Areas

KEY WORDS:

methane oxidation; final cover layer; reduction of GHG emissions; organic compost.

PAGES: 169
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

Brazil is among the countries that emit the most GHG, and part of these come from MSW; thus, the final disposal sites contribute to these emissions due to the decomposition of the biodegradable fraction of the waste. In general, emissions occur through the cover layer and the drains, and, to mitigate these emissions, the oxidative layers (mixture of soil and organic compost) present themselves as an attractive proposal. Thus, the study of such layers is important, mainly for developing regions that need sustainable and effective technologies. To evaluate the characteristics that the incorporation of organic compounds confers on the cover system, three organic compounds and two types of soil were used (Camaragibe and CTR-PE), which resulted in 11 materials; it should be noted that the mixtures between soil and organic compost were carried out in a 1:1 ratio. Geotechnical and physical-chemical characterization tests were carried out, and through these, it was observed that changes occurred in soil textures, where there was an increase in the coarse fraction; the reduction of the values of the maximum apparent dry specific mass of the order of 16.48% and 20.83% for the mixtures of soils from Camaragibe and CTR-PE, respectively; and the increase in optimum moisture, ranging up to 28.89% and 73.77% for the soil mixtures from Camaragibe and CTR-PE, respectively. And, as organic compost is a granular material, higher void rates were generated through the mixtures with variations between 35.37 and 132.62% and 15.92 and 99.98%, when comparing pure soils and mixtures with the soil of Camaragibe and CTR-PE, respectively. It was also verified that such mixtures promoted the addition of organic matter to the system, reaching a neutral pH, between 7.40 and 7.80; in addition to the favorable C/N ratio for the development of microorganisms, and the increase in CEC. With the performance of permeability tests to water and air, it was observed that the incorporation of the compost to the soil of Camaragibe provided, in the respective optimal humidities, higher values of water flux (reduction of 10-1 m.s-1) and airflow (reduction of 10-2 m.s-1) when compared to pure soil; as well as provided greater moisture retention.

COMMITTEE MEMBERS:
Externo à Instituição - MARIA DO SOCORRO COSTA SÃO MATEUS - UEFS
Externo à Instituição - FERNANDO ANTONIO MEDEIROS MARINHO - USP
Presidente - 3199298 - MAURICIO ALVES DA MOTTA SOBRINHO