The present study focuses on a bibliometric analysis of the global production of scientific papers related to the recovery of bioenergy from orange industrial waste or by-products. The study also observed the top-cited papers, international collaborative networks, top countries, and journals. The timespan was from 1900 to 2019, and the Web of Science © database was used. A total of 161 documents (research and review papers) were selected to carry out the investigation. Two main clusters of literature were highlighted, related to the authorship of the top-cited papers and authorship collaboration networks, respectively. Recent scientific publications use different pre-treatments to achieve the best biogas yield with many configurations of the anaerobic digestion system. The data indicated that the countries with most publications are Spain, China, and the USA, and the journals with a higher impact factors related to environmental assessments were responsible for a higher number of publications. In a biorefinery concept, orange peel could be submitted to different pre-treatments to produce bioethanol and methane, as environmentally friendly fuels, and other co-products such as d-limonene and pectin. This study therefore presents trends in bioenergy production from orange industrial by-products with the aim of supporting further research on energy recovery from orange industry solid waste and to assist future decision making in this field of science.

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This study aims to evaluate the Brazilian production of açaí, focusing on its waste generation and addressing mass and energy balances arising from its cultivation, extraction, processing, and waste disposal. A new technological route for açaíʼs waste management was introduced for bioenergy recovery based on the circular economy concept. In 2018, Brazil produced 1.7 million tons of açaí fruit for an income of 1.07 billion USD, and the associated waste generation (seeds) was estimated at 85%. Due to the high production of waste, an innovative approach was developed for a system boundary (conceptual line that divides the system), including the management of solid and liquid wastes through anaerobic digestion (AD). The results showed that, from 1 ton of açaí fruit fed into the facility for processing, 1.2 ton of solid waste and wastewater was generated. This waste was submitted to AD and produced 2.77 m3 of biogas, with a methane composition of 50%. The complete industrial process demands 25 kWh per ton of frozen pulp. The local energy produced by the biogas burning could be recycled and used by the process, establishing a circular energy economy for this sector. With the adoption of AD waste management, about 61% of the external electricity requirement for the açaí fruit processing can be replaced from the biogas produced. The adoption of this technology can be contribute to decarbonization. Furthermore, the implementation of AD could support the transition to a circular economy, with environmental, social, and economic benefits for local and regional sustainable development. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd

Greenhouse gas emissions and climate change has been partially attributed to agricultural expansion by deforestation, while the pressure to assure food, fiber and energy for the future generations leads to the intensification of agricultural systems. The transition to more efficient systems is actually considered an important strategy to reduce deforestation and to spare land for other uses, including the recovery of environmental services and ecohydrological processes in the drainage basin such as carbon sink and water regulation. The Brazilian Federal Program for Low Carbon Agriculture (ABC Program) intends to reduce carbon emissions by stimulating technological processes that neutralize emissions or enhance the sinking of greenhouse gases. A pilot farm has been established to assess an intensive animal-plant farming system that incorporates anaerobic digestion for biogas, power generation and organic fertilizer production. Emergy Synthesis was chosen as a methodological tool to assess and to diagnosis the farm system design. The modified emergy assessment including externalities (greenhouse gas emissions) improves the understanding of integrated crop-livestock systems efficiency in internal recycling of nutrients and power conversion. The adoption of manure treatment in intensified agricultural systems can effectively contribute to enhance environmental and economic performances.

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