Recent advances on anaerobic digestion of swine wastewater
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REVIEW
Recent advances on anaerobic digestion of swine wastewater G. Lourinho1 · L. F. T. G. Rodrigues1 · P. S. D. Brito1 Received: 20 April 2019 / Revised: 1 October 2019 / Accepted: 2 June 2020 © Islamic Azad University (IAU) 2020
Abstract Anaerobic digestion is a valuable technology for the elimination of biodegradable pollutants and stabilization of agroindustrial wastes. This review focuses on the AD of wastewaters derived from swine production within the scope of wastewater treatment and bioenergy production. Fundamental principles of AD as a biochemical and microbiological process are described. The effect of essential parameters is also examined in the context of swine wastewater, especially the relation between chemical and operational factors, process stability and performance. The review continues with a discussion of current trends and future achievements in AD research of swine wastes, namely co-digestion with carbon-rich substrates, integration with pretreatment methods, process enhancement via the use of additives, and digestate management. Finally, a brief outlook on the economy of biogas utilization is provided to better understanding the future of AD as biotechnology for on-farm treatment of swine wastewater. Keywords Anaerobic digestion · Swine wastewater · Microbiology · Inhibition · Biogas · Digestate
Introduction Livestock production industries are one of the most traditional agricultural subsectors in Europe, with primary importance in the economy of several European countries. Agro-industries such as pig production farms have recently been in the spotlight regarding waste management due to intensive methods of production and high polluting loads of the wastes generated (Bayo et al. 2012; Lahav et al. 2013; Shen et al. 2015). As industrial facilities, pig production farms generate significant amounts of animal waste with high concentrations of organic and inorganic compounds, which are particularly harmful to the environment (Girard et al. 2009; Xu et al. 2016). With environmental regulations becoming tighter in recent decades, combining the historical focus on wastewater treatment with waste to energy has become a matter of growing interest in the industry. Another driving force has been the need to increase profit margins and competitiveness. As such, using swine wastewater (SW) Editorial responsibility: M. Abbaspour. * G. Lourinho [email protected] 1
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for bioenergy production offers a promising alternative to deal with both economic and environmental issues as a way of reducing production costs and ecological impacts in large farms (Jimenez et al. 2015; Araújo et al. 2016). Biological processes are by far the most popular traditional methods for wastewater treatment in agro-industries. Among these technologies, anaerobic digestion (AD) has presented high effectiveness in the elimination of biodegradable pollutants from complex agro-industrial ef
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