Botswana, an arid-to-semi-arid, landlocked nation, confronts significant, interconnected challenges in waste management, energy security, and agricultural productivity, exacerbated by its reliance on imported fuel and food. The country's dominant poultry industry generates substantial and growing volumes of poultry litter (PL), presenting a major disposal challenge that, if improperly managed, leads to severe environmental degradation, including groundwater contamination and biosecurity risks. This paper presents poultry litter pyrolysis as an innovative "waste-to-energy" technology, offering a robust circular economy solution aligned with Sustainable Development Goals (SDG) 1, 2, 7, 12, 13 & 15. The core of this solution is Pyro Carbon Energy's (PCE) Containerized Pyrolysis Plant (CPP), a commercial-scale, electrically heated auger type reactor engineered into a standard ISO-container format. This design offers rapid deployment to remote locations, operating as a continuous process that preheats and dries PL before pyrolyzing it at 400 °C to 600 °C in an oxygen-deprived environment. The CPP uniquely features six independently controlled resistive heating elements and, with an adjustable auger speed, it allows precise temperature profiles and residence times to optimize product quality and yields across fast, medium, and slow pyrolysis regimes. The electricity required by the pyrolysis process is supplied by a gas generator set which is fuelled by the pyrolysis off gas. The pyrolysis process converts poultry litter into four valuable product streams, namely Bio-oil, Biochar, Gaseous Products (Syngas) and Pyrolytic Acid. A pilot project, initiated by Nucarbon Technology (under license from PCE) at Richmark Chicken Farm near Moletemane, will deploy two 5 TPD CPPs, processing a total of 10 metric tons of PL daily. This project addresses the farm's waste challenges, produces fuel oil and electricity for its abattoir, and creates new high-value revenue streams from biofuels and char. The success of this project to establish a reference site at Richmark Chicken Farm, undertaken by Nucarbon Technology, provides a scalable and replicable model for a greener, more inclusive economy across Botswana, the broader Southern African Development Community (SADC) region, and even worldwide.

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Transforming Agricultural Waste into Renewable Resources: A Circular Economy Solution for Botswana via Containerized Poultry Litter Pyrolysis

  • Daniel E. Botha,
  • Martin J. Keyser,
  • Michael M. Mogopa,
  • Sanri Parsley

摘要

Botswana, an arid-to-semi-arid, landlocked nation, confronts significant, interconnected challenges in waste management, energy security, and agricultural productivity, exacerbated by its reliance on imported fuel and food. The country's dominant poultry industry generates substantial and growing volumes of poultry litter (PL), presenting a major disposal challenge that, if improperly managed, leads to severe environmental degradation, including groundwater contamination and biosecurity risks. This paper presents poultry litter pyrolysis as an innovative "waste-to-energy" technology, offering a robust circular economy solution aligned with Sustainable Development Goals (SDG) 1, 2, 7, 12, 13 & 15. The core of this solution is Pyro Carbon Energy's (PCE) Containerized Pyrolysis Plant (CPP), a commercial-scale, electrically heated auger type reactor engineered into a standard ISO-container format. This design offers rapid deployment to remote locations, operating as a continuous process that preheats and dries PL before pyrolyzing it at 400 °C to 600 °C in an oxygen-deprived environment. The CPP uniquely features six independently controlled resistive heating elements and, with an adjustable auger speed, it allows precise temperature profiles and residence times to optimize product quality and yields across fast, medium, and slow pyrolysis regimes. The electricity required by the pyrolysis process is supplied by a gas generator set which is fuelled by the pyrolysis off gas. The pyrolysis process converts poultry litter into four valuable product streams, namely Bio-oil, Biochar, Gaseous Products (Syngas) and Pyrolytic Acid. A pilot project, initiated by Nucarbon Technology (under license from PCE) at Richmark Chicken Farm near Moletemane, will deploy two 5 TPD CPPs, processing a total of 10 metric tons of PL daily. This project addresses the farm's waste challenges, produces fuel oil and electricity for its abattoir, and creates new high-value revenue streams from biofuels and char. The success of this project to establish a reference site at Richmark Chicken Farm, undertaken by Nucarbon Technology, provides a scalable and replicable model for a greener, more inclusive economy across Botswana, the broader Southern African Development Community (SADC) region, and even worldwide.