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Affiliation(s)

1. Departamento de Posgrado, Salud Ocupacional, Seguridad e Higiene, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, Ciudad de México 07320, México
2. Departamento de Biociencias e Ingeniería, Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo, Instituto Politécnico Nacional, Ciudad de México 07340, México
3. Departamento El Hombre y su Ambiente, Universidad Autónoma Metropolitana Xochimilco, Ciudad de México 04960, México
4. Secretaría de Obras y Servicios, Gobierno de la Ciudad de México, Ciudad de México 06000, México
5. Unidad Profesional Interdisciplinaria de Biotecnología, Instituto Politécnico Nacional, Ciudad de México 07340, México
6. Departamento de Energía, Universidad Autónoma Metropolitana Azcapotzalco, Ciudad de México 02200, México

ABSTRACT

Management of MSW (Municipal Solid Waste) is a major downside in most of the biggest cities. The composting of the organic fraction of MSW is one of the oldest and simplest ways of organic waste stabilization. It is a self-heating biological conversion that generates appropriate finished merchandise such as soil conditioner or fertilizers. Mexico City generates about 12,500 ton/day of MSW, 44% of it is food scraps and yard trimmings which are the OFMSW (Organic Fraction of Municipal Solid Waste), 2,500 ton/day of it is composted at the BPCP (Bordo Poniente Composting Plant) yielding 500 ton/day of compost. The purpose of this study was to evaluate three treatments to accelerate the composting process, so eventually the city could increase the amount of the OFMSW at BPCP. We compared three different treatments; one of them showed a significant reduction in time of the composting process (p ≤ 0.05) i.e., it took less time to reach the thermophilic stage, maturity and stabilization phases. Maturity was achieved at 35 days and 60 days to stabilize. We conclude that shredding the feedstock plus leachate inoculum addition at the beginning of the process, reduces the composting time in about 61% with respect to the time it takes at the BPCP, where lasted 90 days.

KEYWORDS

Composting, organic fraction, municipal, solid waste, inoculum, leachates, size particle.

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