Authors : Archal Ngandote Mutemusa; Daniel Mudinga Mudinga; Camille Kande Tshimanga; Patience Ngelinkoto Mpia; John Keyembe Mputu; Francklin Ngwibaba Ansuele

Volume/Issue : Volume 10 - 2025, Issue 8 - August

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DOI : https://doi.org/10.38124/ijisrt/25aug1072

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Abstract : This study was conducted to determine the physicochemical and bacteriological quality of agricultural water in the KIMPE district of Delvaux, in the Ngaliema municipality of Kinshasa. To this end, two points, including the Djelo River (P1) and a pond (P2), were targeted for water sampling, which were collected manually in November 2024. The physicochemical analyses, carried out in situ using the WTW multi-parameter probe, consisted of measuring several parameters (temperature, pH, electrical conductivity, and dissolved oxygen), while in the laboratory, the major dissolved ions (nitrates, phosphate, and sulfates) were measured by spectrophotometry. The bacteriological analyses consisted of the identification and quantification by the membrane culture method of bacteria indicating fecal pollution including Escherichia coli, Enterococcus and total coliforms. The results obtained revealed the following average values for the studied parameters:  Temperature (in °C): 36.6 °C (P1) and 36.7 °C (P2). These values recorded during this study are slightly higher than the limit value (35 °C) of the WHO guidelines for agricultural irrigation water. This slight thermal pollution can be explained by domestic wastewater discharge.  pH: 4.5 (P1) to 5.0 (P2). All these average pH values recorded demonstrate that the studied waters are all more acidic than the standard value (5.5-6.5). This could be explained by the contribution of potentially acidic runoff water, which tends to lower the pH of the waters in the study environment.  Dissolved oxygen (in mg/L): 5.3 (P1) and 4.5 (P2). These levels are all below the WHO guideline (≥ 7 mg/L) for agricultural irrigation water. There is therefore an oxygen deficit in the study environment, linked in part to the organic matter pollution present in these waters.  Electrical conductivity (in μS cm−1): 10.0 (P1) and 12.0 (P2). In both samples, the electrical conductivity values recorded comply with the WHO standard, which sets the maximum conductivity value at 12 μS/cm for agricultural irrigation water.  NO3- ion concentration (in mg/L): 47.61 (P1) and 25.17 (P2). The nitrate ion concentration complies with the WHO standard for water. Agricultural irrigation (limit value 27 mg/L) in the pond water (P2), while it exceeds the limit for the Djelo River water (P1).  Concentration of PO43- ions (in mg/L): 7.04 (P1) and 11.0 (P2). All these concentrations are above the limit required by the WHO standard for agricultural irrigation water (1.5). They indicate organic pollution that could lead to eutrophication.  Concentration of SO42- ions (in mg/L): 15 at both sampling points. These values are within the normal range (<200) and sufficient for plant growth. As for bacteriological analyses, the following average concentrations were recorded in CFU/100 mL:  For E. coli: 24 (P1) and 52 (P2)  For Enterococcus: 110 (P1) and 18 (P2)  For total coliforms: 220 (P1) and 152 (P2) All these concentrations are above the limit value (i.e., 10 CFU/100 mL). The results of this study indicate that the irrigation water used for market gardening in the Delvaux neighborhood of the Djelo site, in the Ngaliema commune of Kinshasa, is generally of a quality that does not comply with WHO standards for agricultural irrigation water. They are characterized by remarkable acidity, phosphate enrichment, and fecal contamination.

Keywords : Vegetable Crops, Irrigation Water, Water Quality, Fecal Contamination

References :

1. Abdelhafid, Y., Rechachi, M.Z., Halitim, A. (2019), Geochemical characterization of irrigation water in the Oumache palm grove (Ziban Oasis, southeastern Algeria). Journal of Water Science, 32(1), 69-81. https://doi.org/10.7202 /1059881ar
2. Abdoulaye Diallo (2021), Study of irrigation water pollution in the market gardening areas of Bamako, final thesis, University of Bamako – Agricultural and Environmental Sciences, 128P.
3. Camuzard j. P., (2005), Soil, a complex environment with limited purifying power, Engref Paris.
4. El Hali (2015), The impact of pressurized irrigation on soil and water in the N'fis N4 sector - Oudaia region, Cadi Ayyad University, Faculty of Science and Technology, Marrakech, p23-p26.
5. El Hali (2015), The impact of pressurized irrigation on soil and water in the N'fis N4 sector - Oudaia region, Cadi Ayyad University Faculty of Science and Technology, Marrakech.
6. F. Bouchemal (2020/2021), Reuse of wastewater in agriculture from the El Oued wastewater treatment plant (step 2), Echahid Hamma Lakhdar El Oued University, pp. 29–31.
7. Horning H M. (1973), Role of rational irrigation water management at the farm level. FAO/UNDP regional seminar, Damascus. December 7-13, 1971. pp. 10-21.
8. Aouata (2015), Study and development of underground irrigation in Algeria, master's thesis, École Nationale Supérieure d'Hydraulique -Arbaoui Abdallah-, p1.
9. Kaboré Alfred (2019), Assessment of the quality of surface water used for irrigation in the Ouagadougou region, final thesis, University of Ouagadougou- Sciences and Technology., 112 p.
10. Kouamé Ange-Marie (2018), Quality of water used in irrigated agriculture in the Bouaké region: the case of catchment basins, Houphouët-Boigny University, final thesis, 140 p.
11. Mbaya Lufuluabo Christine (2022), Analysis of the quality of groundwater used in agriculture in the Lubumbashi region, final thesis, University of Lubumbashi - Agricultural Sciences, 110 pages.
12. Mbuyi Tshibangu Claudine (2020), Comparison of the physical-chemical (pH, COD, etc.) and bacteriological parameters of water used for irrigation in different agricultural sites in Kinshasa, National Pedagogical University (UPN), 135 pages.
13. Ngoma Mbala (2018), Analysis of the quality of water intended for agricultural use in urban livestock farming sites, final thesis, University of Kinshasa – Agricultural Sciences, 120 pages
14. NGANDOTE ET AL 2025, Assessment of drinking water quality in the city of Kenge in the Democratic Republic of Congo.
15. Niyongabo Jean Pierre (2020), assessment of agricultural pollution caused by irrigation water in peri-urban areas, final thesis, University of Burundi, 102 pages