Ethanol addition as a strategy for start-up and acclimation of an AnSBBR for the treatment of landfill leachate |
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| Authors: | Ronan Cleber Contrera Arnaldo Sarti Marcus César Avezum Alves de Castro Eugenio Foresti Marcelo Zaiat Valdir Schalch |
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| Institution: | 1. Departamento de Engenharia Hidráulica e Ambiental (PHD), Escola Politécnica (EP), Universidade de São Paulo (USP), Avenida Prof. Almeida Prado, 83 trav. 2, Cidade Universitária, CEP: 05508-900, São Paulo, SP, Brazil;2. HagaPlan Engenharia e Serviços, Praça Ramos de Azevedo, 206 – 26° andar, Conjuntos 2610/2620 – Edifício Esplanada – República, CEP: 01037-010, São Paulo, SP, Brazil;3. Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Av. 24-A, 1515, Bela vista, CEP: 13506-900, Rio Claro, SP, Brazil;4. Laboratório de Processos Biológicos (LPB), Centro de Pesquisa Desenvolvimento e Inovação em Engenharia Ambiental, Departamento de Hidráulica e Saneamento (SHS), Escola de Engenharia de São Carlos (EESC), Universidade de São Paulo (USP), Engenharia Ambiental, Bloco 4-F, Av. João Dagnone, 1100, Santa Angelina, CEP: 13.563-120, São Carlos, SP, Brazil;5. Departamento de Hidráulica e Saneamento (SHS), Escola de Engenharia de São Carlos (EESC), Universidade de São Paulo (USP), Avenida Trabalhador São-carlense, 400, Centro, CEP: 13566-590, São Carlos, SP, Brazil |
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| Abstract: | This study evaluated the ethanol addition as a strategy for start-up and acclimation of a pilot scale (1300 L) anaerobic sequencing batch biofilm reactor (AnSBBR) for the treatment of municipal landfill leachate with seasonal biodegradability variations. The treatment was carried out at ambient temperature (23.8 ± 2.1 °C) in the landfill area. In a first attempt, the leachate collected directly from landfill showed to be predominantly recalcitrant to anaerobic treatment and the acclimation was not possible. In a second attempt, adding ethanol to leachate, the reactor was successfully acclimated. After acclimation, without ethanol addition, the CODTotal influent ranged from 4970 to 13040 mg L?1 and the removal efficiencies ranged from 12.1% to 70.7%. A final test was carried out increasing the ammonia and free-ammonia concentration from 2486 mgN L?1 and 184 mgN L?1 to 4519 mgN L?1 and 634 mgN L?1, respectively, with no expressive inhibition verified. The start-up strategy was found to be feasible, providing the acclimation of the biomass in the AnSBBR, and maintaining the biomass active even when the leachate was recalcitrant. |
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| Keywords: | Landfill leachate Anaerobic sequencing batch biofilm reactors Ethanol addition Start-up strategy Acclimation |
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