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Anaerobic co-digestion of crude glycerin and starch industry effluent Codigest o anaeróbia de glicerina bruta e efluente de fecularia

Keywords: manipueira , biodiesel , biogás , glicerol , cassava wastewater , biodiesel , biogas , glycerol

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Abstract:

The Brazil's Biodiesel Production and Use Program introduces biodiesel in the Brazilian energy matrix, bringing along the perspective of a growth of the glycerin offer, co-product generated in the proportion of 10 kg for each 100 L of biodiesel. The aim of this study was to evaluate the addition of crude glycerin in the anaerobic digestion of cassava starch industry effluent (cassava wastewater), in a horizontal semi-continuous flow reactor of one phase in laboratory scale. It was used a reactor with a 8.77 L of useful volume, a medium support for corrugated conduit of polyvinyl chloride (PVC), temperature of 261 oC, fed with cassava wastewater and glycerin, with hydraulic detention times of 4 and 5 days and increasing volumetric organic load of 3.05; 9.32; 14.83 and 13.59 g COD L-1 d-1, obtained with the addition of glycerin at 0; 2; 3 and 2% (v/v), respectively. The average removal efficiencies of TS and TVS were decreasing from the addition of glycerin to the cassava wastewater, averaging 81.19 to 55.58% for TS and 90.21 to 61.45% for TVS. The addition of glycerin at 2% increased the biogas production compared to the control treatment, reaching 1.979 L L-1 d-1. The biogas production as a function of the consumed COD was higher for the control treatment than for the treatments with addition of glycerin, which indicates lower conversion of organic matter into biogas. O Programa Nacional de Produ o e Uso do Biodiesel introduziu o biodiesel na matriz energética brasileira, trazendo a perspectiva de aumento da oferta de glicerina, coproduto gerado na propor o de 10 kg para cada 100 L de biodiesel. O objetivo principal deste trabalho foi avaliar a adi o de glicerina bruta na digest o anaeróbia de efluente de indústria de fécula de mandioca (manipueira), em reator de fluxo semicontínuo horizontal de uma fase, em escala de laboratório. Foi utilizado um reator com volume útil de 8,77 L, meio suporte em eletroduto corrugado de policloreto de vinila (PVC), temperatura de 261 oC, alimentado com manipueira e glicerina, aplicando-se tempos de deten o hidráulica de 4 e 5, dias e cargas organicas volumétricas crescentes de 3,05; 9,32; 14,83 e 13,59 g COD L-1 d-1, obtidas com a adi o de glicerina aos níveis de 0; 2; 3 e 2% (v/v), respectivamente. As eficiências de remo o média de ST e STV foram decrescendo a partir da adi o de glicerina à manipueira, com médias de 81,19 a 55,58 % para ST e 90,21 a 61,45% para STV. A adi o de glicerina em 2% aumentou a produ o de biogás em rela o ao tratamento-controle, chegando a 1,979 L L-1 d-1. A produ o de biogás em fun

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