Anaerobic co-digestion of a ternary mixture of sewage sludge with food waste and residual glycerol was evaluated in pilot scale units, with the aim to increase methane production in sludge anaerobic digesters at sewage treatment plants. Two pilot scale anaerobic digesters (useful volume of 320 L) operated simultaneously for 60 days at room temperature (24 °C on average). One digester received only sludge in the feed, and the other received the ternary mixture. The feeding routine of the digesters respected a semi-continuous mode. The units continuously promoted the mixing of the sludge through a bottom-up recirculation system with a hydraulic retention time of 30 d. The digester fed with just sewage sludge had greater instability during the whole period of operation, producing about 3 L d–1 of biogas with 23% methane, volatile solids (VS) removal of 65.3%, and methane yield (MY) of 98.5 LN CH4 kg–1 VS add. On the other hand, the digester fed with the ternary mixture produced 21 L d–1 of biogas with 43% methane, VS removal of 73.4%, and MY of 174.5 LN CH4 kg–1 VS add. The mass and energy balances showed that through methane recovery, the ternary mixture substrate contributed to the production of 12 times more energy than that of digesters fed with pure sewage sludge.
Resumo: A implementação do Programa Sertão Empreendedor no semiárido, destaca o grande avanço que a agricultura familiar vem conquistando no âmbito regional e suas contribuições para a fixação do sertanejo no campo. O trabalho em questão desenvolve uma análise das contribuições que o programa Sertão Empreendedor trará para o semiárido e para a sua população. Quanto à metodologia utilizada foi o de pesquisa bibliográfica. A análise dos resultados evidencia que a implementação desse programa no semiárido trará benefícios para a população como capacidade de geração e renda para os membros das comunidades rurais. É necessário que sejam desenvolvidos novos estudos com essa temática para que se tenha cada vez mais dados sobre a importância de políticas públicas para o desenvolvimento da agricultura e fixação do homem no campo. Palavras-chaves: Agricultura familiar, Empreendedorismo, Desenvolvimento rural;Abstract The implementation of the Wilderness Enterprising Program in the semiarid region, highlights the great progress that family farming has gained at the regional level and their contribution to the establishment of the backcountry in the field. The work in question provides an analysis of the contributions that the wilderness enterprising program will bring to the semi-arid region and its population. As for the methodology used was to literature. The analysis shows that the implementation of this program in the semiarid region will benefit the population as generation capacity and income for members of rural communities. They need to be developed further studies on this topic in order to have more and more data about the importance of public policies for the development of agriculture and keep workers in the field.
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