Research Paper
Year: 2023 | Month: April | Volume: 10 | Issue: 4 | Pages: 133-138
DOI: https://doi.org/10.52403/ijrr.20230417
Essay the Recovery of Solid Household Waste from The City of Kindia by Composting, (Republic of Guinea)
Wogbo Dominique GUILAVOGUI1, Ansoumane SAKOUVOGUI2, Ibrahima BAYO3, Mamby KEITA4, Idrissa DIABY5
1Energy Department, Scientific Research Center of Conakry-Rogbane, Conakry, Guinea
2Energy Department, Higher Institute of Technology of Mamou, Guinea
3Energy Department, Scientific Research Center of Conakry-Rogbane, Conakry, Guinea Energy Department
4Department of Physics, Faculty of Sciences, Gamal Abdel Nasser University of Conakry, Guinea
5Department of Physics, Faculty of Sciences, Gamal Abdel Nasser University of Conakry, Guinea
Corresponding Author: Wogbo Dominique GUILAVOGUI
ABSTRACT
Background and Aim: In Guinea, waste management occupies a central place in the State's environmental policy. The objective of this study is to recover fermentable waste by composting as an alternative to landfilling and incineration of waste. This work was carried out in November and December 2022 in the composting center of the urban municipality of Kindia.
Method: This study is a continuation of research work on the management and recovery of solid household waste in the city of Kindia. The andean or elaborate heap method of composting was used. It covers the following steps: preparation of the material to be composted, on-site observation, evaluation of the compost material and physico-chemical analysis of the compost. Composting was carried out in a windrow over an area 2m long, 1.5m wide and 1.5m high, i.e. a volume of 4.5m3.
Results: The results obtained show that with an initial quantity of 960 kg of household solid waste used, we obtained 380 kg of compost after almost 30 days of composting, i.e. 39.58% compost (biodegradable waste) and 60.15% rejection. During the composting process, the temperature in the ande varied from 29°C to 68°C, with an average of 47.32°C. In the ambient environment, it varied from 23.80°C to 34°C, with an average of 28.13°C. The evolution of the pH as a function of time showed three different phases (acidogenic phase, neutral phase and alkaline phase). The acidogenic phase lasts 15 days, for a pH varying from 5 to 6.5. The neutrality phase lasted 8 days (pH around 7). From the 23rd day there was the transition to the alkalinization phase (pH varied from 7.8 to 8.7). The humidity level has decreased significantly over time, around 75% in young compost, it is only around 15% in mature compost. At the start of composting the C/N ratio was about 25 and at the end of the process C/N was reduced to 10. During the process the EC content varied from 4.5 ms/cm (initially) to 7.3 ms/cm until day 25, followed by a gradual decrease until the end of the composting process (1.8 ms/cm).
Conclusion: This study made it possible to carry out a test for the recovery of solid household waste from the city of Kindia by the composting process for soil amendments. It remains to be popularized and encouraged by NGOs and government agencies in the country.
Keywords: Solid waste, recovery, household, composting, Kindia
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