Abstract
The objective of this study was to build and develop anaerobic biodigesters for optimization of biogas production using food waste (FW) and sewage (S) co-digestion from a wastewater treatment plant (WWTP). The biodigesters operated with different mixtures and in mesophilic phase (37 °C). During the 60 days of experiments, all control and monitoring parameters of the biodigesters necessary for biogas production were tested and evaluated. The biodigester containing FW, S and anaerobic sludge presented the biggest reduction of organic matter, expressed with removal of 88.3% TVS (total volatile solid) and 84.7% COD (chemical oxygen demand) the biggest biogas production (63 L) and the highest methane percentage (95%). Specific methane production was 0.299 LCH4/gVS and removed. The use of biodigesters to produce biogas through anaerobic digestion may play an important role in local economies due to the opportunity to produce a renewable fuel from organic waste and also as an alternative to waste treatment. Finally, the embedded control and automation system was simple, effective, and robust, and the supervisory software was efficient in all aspects defined at its conception.
Highlights
Nowadays, one of the biggest problems faced by many countries, developing ones, is the final disposal of municipal solid waste (MSW), mainly due to environmental, social, and economic problems caused by its poor management
With a view to verifying the best proportions to be used in the biodigesters, three collections of secondary sludge, food waste and sewage were carried out, and only one test of Total Carbon (CT) was performed for food waste of 68.6 mg/L; the remaining descriptions are presented on Table 1
It was possible to evaluate the influence of food waste and sewage co-digestion in biogas production for anaerobic digestion processes
Summary
One of the biggest problems faced by many countries, developing ones, is the final disposal of municipal solid waste (MSW), mainly due to environmental, social, and economic problems caused by its poor management. Besides the problems associated with MSW, pollution of water resources and access to energy sources have historically represented challenges for economic growth, human health, and environmental preservation all over the world [3,4]. In Brazil, MSW presents organic matter as its biggest share, coming mainly from restaurants and households [5]. Anaerobic digestion is one of the solutions to reduce these problems and an attempt to reuse MSW. It is known that anaerobic digestion is a process through which organic waste is biologically converted using a microbial consortium in the absence of oxygen [6]
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