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Isolation of Bacteria with Purifying Potential and Application in the Treatment of Effluents from an Artisanal Palm Oil Mill in the littoral Region of Cameroon

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journal of Environmental Protection 2021年第7期12卷 462-471页

作者： Djien Nyami Félicité Noubou Takam Daïna Fobasso Tagnikeu Roméo tcheugoue styve joël Njicoumbe Fatima Ndzobo Ndzana joël Kuessie Yanick Bella josiane Foncha Felix Emmanuel Mpondo Mpondo Véronique Penlap Beng Tavea Fréderic Marie Department of Biochemistry Faculty of Science University of Douala Douala Cameroon Institute of Agricultural Research for Development (IRAD) Yaounde Cameroon Department of Pharmaceutical Sciences Faculty of Medicine and Pharmaceuticals Sciences University of Douala Douala Cameroun Department of biochemistry Faculty of Science University of Yaounde Yaounde Cameroon

It is with the aim of solving the problem of generating large quantities of effluents from palm oil production in the littoral region of Cameroon that this study was carried out with the general objective of reducing the pollutant load of these effluents by using bacteria. To this end, raw palm oil mill wastewater samples were taken for their characterization by evaluating the in-situ (Temperature, pH and (CND) Conductivity) and ex-situ (SS (suspended solid), COD (chemical oxygen demand), BOD (biological oxygen demand) and O/F (oil and fat)) parameters. In addition, bacterial isolation and screening were carried out from samples of contaminated soil based on the production of lipolytic enzymes, the degradation of oils and fats and the reduction of the pollutant load. Results revealed that 28 isolates were able to reduce the pollution parameters of palm oil mill effluents of which D17, D22 and D23 seemed to be the best purifying isolates. The characterization of the POME (palm oil mill effluent), basing the temperature, pH, CND, O/F, SS, BOD and COD showed us values greater than the recommended rate. Partial characterization of these isolates revealed that D17 and D23 are bacteria that could reduce the polluting parameters of the effluents belonged to the Bacillus sp. genus and D22 to the Acinetobacter sp. genus. These results are satisfactory and the bacteria strains obtained could be used in bioremediation.

关键词： Palm Oil Mill Effluent Bacteria Pollution Cameroon

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Analysis of the Spatio-Temporal Dynamics of land Use in the Bamboutos Mountains of the West Region of Cameroon

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Open journal of Forestry 2022年第2期12卷 216-234页

作者： Guy Herman Tchoutezou Zanguim Abubakar Ali Shidiki Alphonse loic tcheugoue Tientcheu Martin Ngankam Tchamba Department of Forestry Faculty of Agronomy and Agricultural Sciences University of Dschang Dschang Cameroon Department of Geography Faculty of Arts Letters and Humanities University of Yaoundé 1 Yaoundé Cameroon

The current level of knowledge of the biophysical situation, human activity and governance in the Bamboutos Mountains does not shed enough light on the dynamics of the vegetation, the socio-economic aspects and ecological opportunities that are essential for a successful restoration initiative in this degraded landscape of the Bamboutos mountain ecosystems. The objective of the study was to map and analyze the dynamics of land use from landsat images of 1980, 2000 and 2021. Supervised classification by maximum likelihood was applied and the dynamics were analyzed using area curves and calculations. The cartographic results were used to produce land use maps. The analysis of the land cover dynamics shows that the evolutionary trend of the vegetation formations is essentially regressive for agro-forests and dense forests at -21.20% and -3.62% respectively. The classes that showed a clear progression were bare soil (9.78%), crop land (8.03%), built-up areas (5.19%) and shrubby savannahs and grassland (1.84%). Agriculture, livestock grazing and demographic pressure are the main causes of land degradation and mutation of the landscape. The results of this study provide an understanding of the land-use history of this landscape, and a solid basis for planning a restoration initiative. They provide guidance on priority areas and types of restoration intervention from a social, economic and ecological perspective.

关键词： Bamboutos Mountains GIS Mapping Degradation landscape Restoration

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Quantifying Forest loss in the Mbalmayo Forest Reserve (Center Region, Cameroon)

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journal of Geoscience and Environment Protection 2022年第9期10卷 271-288页

作者： Mingang Danielle liliane Ngueguim Jules Romain Momo Solefack Marie Caroline Tchongouang Abigaelle Tientcheu tcheugoue Alphonse loic Unité de Recherche de Botanique Appliquée (URBOA) Department of Plant Biology Faculty of Science University of Dschang Dschang Cameroon Agricultural Research Institute for Development (IRAD) Yaoundé Cameroon Department of Geography Faculty of Letters and Humanities University of Dschang Dschang Cameroon Department of Geography Faculty of Arts Letters and Humanities University of Yaoundé I Yaoundé Cameroon

This study was carried out in the forest reserve of Mbalmayo, Center Region of Cameroon, with the aim to analyze the dynamics of land use/land cover (lUlC) changes over the past 30 years. The databases used were made up of 3 landsat satellite images (5TM of 1990, 7ETM+ of 2005 and 8OlI of 2020). The satellite images were processed using ArcGIS and Erdas Imagine software. Ethnobotanical surveys were conducted to investigate the relationships between the local population and the forest reserve. The Mbalmayo forest reserve is consisted of seven main land cover namely: mature secondary forest, young secondary forest, savanna, fallows and crops, built, bare soil and water surface. The dynamics of the forest cover undergoes more significant changes between the years 1990-2005 with losses estimate at 4762 ha compared to the years 2005-2020 (2231 ha), with a marked decrease in the area of dense forests. This regression is much more important in dense forest vegetation. The forest cover lost 6993 ha (26.92%) of its surface, which corresponds to an average rate of deforestation of 233.1 ha/year. The survey revealed the need for NTFPs for the Mbalmayo reserve forest populations. Indeed, all respondents agreed that they use non-timber forest products from the forest, mainly for medication (37%), wood (34%) and food (24%). Therefore, it becomes urgent to redefine a management plan for the Mbalmayo forest reserve which will define how the forest must be managed in order to avoid the loss of large areas of forests disappearing each year under the human action, which exerts pressure on forest species, thus leading to their possible disappearance.

关键词： Mbalmayo Forest Reserve Satellite Images Ethnobotany land Use/land Cover Change

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