Microbial Profile of the Leachate from Mexico City’s Bordo Poniente Composting Plant: An Inoculum to Digest Organic Waste

Aixa Kari Gállego Bravo, Daniel Alejandro Salcedo Serrano, Gloria López Jiménez, Khemlal Nirmalkar, Selvasankar Murugesan, Jaime García-Mena, María Eugenia Gutiérrez Castillo and Luis Raúl Tovar Gálvez
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Aixa Kari Gállego Bravo: Instituto Politécnico Nacional, Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo, Calle 30 de Junio de 1520 s/n, 07340 Ciudad de México, Mexico
Daniel Alejandro Salcedo Serrano: Instituto Politécnico Nacional, Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo, Calle 30 de Junio de 1520 s/n, 07340 Ciudad de México, Mexico
Gloria López Jiménez: Departamento de Ciencias Básicas, Instituto Politécnico Nacional, Unidad Profesional Interdisciplinaria de Biotecnología, Av. Acueducto s/n, 07340 Ciudad de México, Mexico
Khemlal Nirmalkar: Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del IPN, Av. Instituto Politécnico Nacional 2508, 07360 Ciudad de México, Mexico
Selvasankar Murugesan: Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del IPN, Av. Instituto Politécnico Nacional 2508, 07360 Ciudad de México, Mexico
Jaime García-Mena: Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del IPN, Av. Instituto Politécnico Nacional 2508, 07360 Ciudad de México, Mexico
María Eugenia Gutiérrez Castillo: Instituto Politécnico Nacional, Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo, Calle 30 de Junio de 1520 s/n, 07340 Ciudad de México, Mexico
Luis Raúl Tovar Gálvez: Instituto Politécnico Nacional, Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo, Calle 30 de Junio de 1520 s/n, 07340 Ciudad de México, Mexico

Energies, 2019, vol. 12, issue 12, 1-21

Abstract: In recent years, municipal solid waste (MSW) management has become a complex problem worldwide. Similarly, Mexico City is facing such a situation for the management and treatment of organic fraction of municipal solid waste (OFMSW). Therefore, in this work, we investigated whether leachate from the composting plant, Bordo Poniente, located in Mexico City can be used as an inoculum for the treatment of OFMSW using thermophilic anaerobic digestion (AD) with a hydraulic retention time of 30 days. We analyzed the physicochemical properties of the leachate and performed a biochemical methane potential test. Archaeal and bacterial diversity was also identified using high throughput DNA sequencing of 16S rDNA libraries. Methane yield was 0.29 m 3 CH 4 /kg VS added in the positive control and 0.16 m 3 CH 4 /kg VS added in the treatment group. The phylum, Bacteroidetes, and genus, Methanosarcina , prevailed in the leachate. However, in thermophilic conditions, the microbial communities changed, and the phylum, Firmicutes, genera, Methanoculleus , and candidate genus, vadinCA11 , were dominant in the treatment group. We concluded that the leachate contains a suitable initial charge of many active bacteria and methanogenic archaea which contribute to the AD process, hence it can be used as an inoculum for the treatment of OFMSW.

Keywords: high throughput DNA sequencing; leachate; methanogens; microbial diversity; organic fraction of municipal solid waste; thermophilic anaerobic digestion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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