Nutritional, Energy and Sanitary Aspects of Swine Manure and Carcass Co-digestion.

Deisi Cristina Tápparo,Paula Rogovski,Rafael Dorighello Cadamuro,Marta Hernández,Gislaine Fongaro,Airton Kunz,Helen Treichel,Thamarys Scapini,Fábio Stefanski,Doris Sobral Marques Souza,David Rodríguez-Lázaro,Aline Frumi Camargo,André Amaral,Charline Bonatto

doi:10.3389/fbioe.2020.00333

Abstract

Renewable energy can assist the management of the effects of population growth and rapid economic development on the sustainability of animal husbandry. The primary aim of renewable energy is to minimize the use of fossil fuels via the creation of environmentally friendly energy products from depleted fossil fuels. Digesters that treat swine manure are extensively used in treatment systems; and inclusion of swine carcasses can increase the organic loading rate (OLR) thereby improving biogas yield and productivity on farms. However, the characteristics of the components including animal residues, proteins, lipids, remains of undigested feed items, antimicrobial drug residues, pathogenic microorganisms and nutrient contents, are complex and diverse. It is therefore necessary to manage the anaerobic process stability and digestate purification for subsequent use as fertilizer. Efficient methane recovery from residues rich in lipids is difficult because such residues are only slowly biodegradable. Pretreatment can promote solubilization of lipids and accelerate anaerobic digestion, and pretreatments can process the swine carcass before its introduction onto biodigesters. This review presents an overview of the anaerobic digestion of swine manure and carcasses. We analyze the characteristics of these residues, and we identify strategies to enhance biogas yield and process stability. We consider energy potential, co-digestion of swine manure and carcasses, physical, chemical, and biological pretreatment of biomass, sanitary aspects of swine manure and co-digestates and their recycling as fertilizers.

Highlights

Meat is one of the most commonly consumed foods around the world, providing a good source of proteins and essential healthy nutrients and minerals, such as iron, zinc, amino acids, and group B vitamins (Wu et al, 2014)
China is the largest producer of swine meat (53.4 million tons in 2017) followed by the European Union (23.6 million tons), the US (11.6 million tons), and Brazil (3.7 million tons); these countries are responsible for approximately 83% of total global production (USDA, 2019)
Anaerobic digestion (AD) of swine carcasses is possible, combining a method to dispose of carcasses with increased biogas generation, but the process and operating criteria must be adapted to ensure complete residue degradation with gas production and material purification (Tápparo et al, 2018)

Summary

Introduction

Meat is one of the most commonly consumed foods around the world, providing a good source of proteins and essential healthy nutrients and minerals, such as iron, zinc, amino acids, and group B vitamins (Wu et al, 2014). CO-DIGESTION OF SWINE MANURE AND CARCASSES TO INCREASE BIOENERGY PRODUCTION

Results

Conclusion