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Authors
Abstract(s)
Em Portugal, a produção de kiwi chegou a 35,4 mil toneladas no ano de 2017, enquanto que entre 2017 e 2018 a produção de vinho alcançou 673 milhões de litros. Destas, uma grande porção acaba se tornando resíduo e não recebendo tratamento adequado. Com o aumento populacional e consequente geração de resíduos, os métodos de eliminação deixam de ser viáveis e acabam pressionando práticas de valorização onde há ganho ambiental, social e económico. A co-digestão anaeróbia (coDA) é um processo de valorização onde microrganismos realizam a degradação da mistura de dois ou mais resíduos, denominados substratos, em ambiente ausente de oxigênio, de modo a produzir biogás e uma fração digerida. Assim, este estudo teve como objetivo caracterizar o kiwi e a borra de vinho, utilizados como substratos, e a lama proveniente de tanque séptico utilizada como inóculo, bem como avaliar a capacidade de produção específica de biogás de cada um e da mistura com diferentes proporções. Para isso, três ensaios foram realizados considerando a variação dos fatores C:N e % inóculo. Apesar dos valores de digestão para cada substrato serem positivos e confirmarem o potencial de seu uso neste tipo de valorização, o ensaio 2 foi o único que em todos os tratamentos de co-digestão apresentou produção superior a do inóculo. O tratamento de coDA com maior produção específica foi o T2.7, composto por 2,5 mL de inóculo, 3,3 mL de borra de vinho, 0,5 mL de kiwi e 193,7 mL de água, além da relação C:N de 30:1, que produziu 973 mLN.g-1 SV de biogás. Ainda que tenha exibido valores positivos, a maioria das proporções de substratos testadas na co-digestão apresentou produção específica total negativa, ou seja, inferior a produção do inóculo.
In Portugal, the kiwi production was 35,4 thousand tons in 2017, while between 2017 and 2018 the wine production reached 673 million litres. Of them, a large portion becomes waste and do not receive appropriate treatment. With increasing population and consequent waste generation, methods of disposal are no longer viable and eventually pushing valuation practices, where there are environmental, social and economic gains. The anaerobic codigestion (AcoD) is a valorization process where microrganisms realized degradation of a mix with two or more waste, called substrate, in an atmosphere without oxygen, producing biogas and a digested portion. Thus, this study was aimed to characterize the kiwi and wine lees, used like substrate, and the sludged collected in a septic tank and used like inoculum, as well as to evaluate the capacity of biogas production specific each of them and the mix with diferent portions. For this, three tests were carried out considering the variation of C:N and inoculum percentage. Although the values of digestion for each substrate be positives and validate their potential use in this type of recovery, the test 2 was the only that in all treatments of AcoD presented production higher than inoculum. The AcoD treatment with biggest biogas total specific production was T2.7, composed with 2,5 mL of inoculum, 3,3 mL of wine lees, 0,5 mL of kiwi and 193,7 mL of water, besides presenting C:N relation equal to 30:1, that produced 973 mLN.g-1 VS of biogas. Even though it has showed positives values, the most of proportion of substrate and inoculum tested in AcoD presented total specific production negative, in other words, was smaller than inoculum production.
In Portugal, the kiwi production was 35,4 thousand tons in 2017, while between 2017 and 2018 the wine production reached 673 million litres. Of them, a large portion becomes waste and do not receive appropriate treatment. With increasing population and consequent waste generation, methods of disposal are no longer viable and eventually pushing valuation practices, where there are environmental, social and economic gains. The anaerobic codigestion (AcoD) is a valorization process where microrganisms realized degradation of a mix with two or more waste, called substrate, in an atmosphere without oxygen, producing biogas and a digested portion. Thus, this study was aimed to characterize the kiwi and wine lees, used like substrate, and the sludged collected in a septic tank and used like inoculum, as well as to evaluate the capacity of biogas production specific each of them and the mix with diferent portions. For this, three tests were carried out considering the variation of C:N and inoculum percentage. Although the values of digestion for each substrate be positives and validate their potential use in this type of recovery, the test 2 was the only that in all treatments of AcoD presented production higher than inoculum. The AcoD treatment with biggest biogas total specific production was T2.7, composed with 2,5 mL of inoculum, 3,3 mL of wine lees, 0,5 mL of kiwi and 193,7 mL of water, besides presenting C:N relation equal to 30:1, that produced 973 mLN.g-1 VS of biogas. Even though it has showed positives values, the most of proportion of substrate and inoculum tested in AcoD presented total specific production negative, in other words, was smaller than inoculum production.
Description
Mestrado de dupla diplomação com a UTFPR - Universidade Tecnológica Federal do Paraná
Keywords
Co-digestão Reator Biogás Metano Kiwi Borra de Vinho Valorização de resíduos