Scholarlink

Introduction <p>The management of pig manure in sub-Saharan Africa poses significant challenges. Typically, pig manure is indiscriminately disposed of in urban areas without prior treatment, resulting in adverse environmental consequences such as greenhouse gas (GHG) emissions, and biosecurity risks associated with improper handling. To address these issues, the development of low-cost biodigester systems for pig manure management can ameliorate these negative impacts. The objective of this study was to assess the operational efficiency of a low-cost tubular digester system in the urban area of Yaoundé.</p> Methodology <p>Over a period of three months, the digester with a total volume of 2 m<sup>3</sup> and a continuous daily organic loading rate (ORL) of 3.945&#xa0;kg VS/m<sup>3</sup> of pig slurry was monitored. Weekly biogas production measurements were taken and data on physico-chemical and microbiological parameters were collected and analysed.</p> Results <p>Data obtained during the monitoring period revealed that the digester operated consistently without any risk of inhibition. Biogas production exhibited variations over time, ranging from 0.1 to 0.4 m<sup>3</sup> of biogas/Kg VS/D. Furthermore, significant reductions of 82 ± 10.55%, 88 ± 12%, and 83 ± 19% were observed in the levels of volatile solids (VS), chemical oxygen demand (COD), and biochemical oxygen demand (BOD<sub>5</sub>), respectively. Notably, the process resulted in the significant reduction of certain microbial groups (<i>faecal Coliforms</i>, <i>Escherichia coli</i>, <i>Faecal streptococci</i>, <i>Faecal enterococci</i>, <i>Balantidium coli</i>, <i>Entamoeba coli</i>, <i>Hookworms</i>, <i>Entamoeba histolytica</i>, <i>Trichostrongylus</i>), while others remained unaffected (<i>Gardia</i> spp., <i>Trichuris trichuira</i>, <i>Ascaris</i> sp., <i>Cryptosporidium</i> spp., <i>Strongeloides larva</i>).</p> Conclusion <p>This management by anaerobic digestion of pig manure has a double advantage because it not only makes it possible to have an organic fertilizer but also to have an alternative source of energy for cooking within households. However, it is important to note that digestate requires post-treatment before being applied to fields, due to the presence of pathogens.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Assessment of Operational Efficiency of a Low-Cost Tubular Digester for Pig Manure in the Urban Areas of Yaoundé

  • 期刊论文

  • 发表日期：

    2025年3月5日

查看全文
  • Christelle Armelle Fouedjio,
  • Guy Valerie Djumyong Wafo,
  • Anne Ayo,
  • Ines Urielle Jeuke Ngougni,
  • Michèle Nounja Zuitchou,
  • Jean Jules Nana Ndangang,
  • Paul Atabong Agendia,
  • Ives Magloire Kengne Noumsi

摘要

Introduction

The management of pig manure in sub-Saharan Africa poses significant challenges. Typically, pig manure is indiscriminately disposed of in urban areas without prior treatment, resulting in adverse environmental consequences such as greenhouse gas (GHG) emissions, and biosecurity risks associated with improper handling. To address these issues, the development of low-cost biodigester systems for pig manure management can ameliorate these negative impacts. The objective of this study was to assess the operational efficiency of a low-cost tubular digester system in the urban area of Yaoundé.

Methodology

Over a period of three months, the digester with a total volume of 2 m3 and a continuous daily organic loading rate (ORL) of 3.945 kg VS/m3 of pig slurry was monitored. Weekly biogas production measurements were taken and data on physico-chemical and microbiological parameters were collected and analysed.

Results

Data obtained during the monitoring period revealed that the digester operated consistently without any risk of inhibition. Biogas production exhibited variations over time, ranging from 0.1 to 0.4 m3 of biogas/Kg VS/D. Furthermore, significant reductions of 82 ± 10.55%, 88 ± 12%, and 83 ± 19% were observed in the levels of volatile solids (VS), chemical oxygen demand (COD), and biochemical oxygen demand (BOD5), respectively. Notably, the process resulted in the significant reduction of certain microbial groups (faecal Coliforms, Escherichia coli, Faecal streptococci, Faecal enterococci, Balantidium coli, Entamoeba coli, Hookworms, Entamoeba histolytica, Trichostrongylus), while others remained unaffected (Gardia spp., Trichuris trichuira, Ascaris sp., Cryptosporidium spp., Strongeloides larva).

Conclusion

This management by anaerobic digestion of pig manure has a double advantage because it not only makes it possible to have an organic fertilizer but also to have an alternative source of energy for cooking within households. However, it is important to note that digestate requires post-treatment before being applied to fields, due to the presence of pathogens.

Graphical Abstract