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Feasibility study of the application of treated wastewater for the irrigation of forest species in a Saharan area

Publish Year: 1400
Type: Journal paper
Language: English
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JR_EHEM-8-3_005

Index date: 28 September 2021

Feasibility study of the application of treated wastewater for the irrigation of forest species in a Saharan area abstract

Background: After suffering from an acute problem of excess water for a long time, the Oasis of Ouargla benefited from an aerated lagoon treatment plant, producing biologically treated domestic effluents. The aim of this study was to examine the feasibility of reusing this effluent for watering plants. The experiment was conducted in the Ouargla WWTP, which is located in the region of Said Otba (northeast of Ouargla), north of the national road NR 49. Methods: The study area was selected based on the originality of the study and availability of water. The plants used were Acacia farnesiana and Leucaena leucocephala. The selection of Leucaena was based on the following criteria: It is used as a windbreak, it is very tolerant to drought, and it is used as a fodder to maintain soil fertility. And, Acacia was selected because it is used as a fodder, protects the soil against erosion, and to fix nitrogen. The watering of these plants is done jointly by treated wastewater from the WWTP and well water (WW), of which the latter was used as a control. Sampling and analysis of the irrigation water were performed according to the experimental protocol. To show the growth rate of the two plants studied, biometric measurements were taken weekly for 25 weeks. Results: The physicochemical analyses show that the treated wastewater is of poor quality belonging to the last class of Riverside’s C5-S4, with an excessive salinity (EC) of 13.51 dS/m and an Sodium adsorption ratio (SAR) of 12.61 against EC of 2.49 dS/m and 2.13 for the WW. At the end of the experiment, it was found that irrigation with purified wastewater (PWW) gave less growth compared to that with WW. Statistical analyses of the biometric measurements confirmed that there is a highly significant difference at P < 0.05. Conclusion: The reuse of WWTP effluent gives less interesting results but is still possible. It is recommended to choose Salt-tolerant crops, as well as the dilution of these waters by the addition of less salty waters.

Feasibility study of the application of treated wastewater for the irrigation of forest species in a Saharan area Keywords:

Feasibility study of the application of treated wastewater for the irrigation of forest species in a Saharan area authors

Hamza Negais

Corresponding author: Department of Biology, Laboratory of Phoeniciculture Research, University of Ouargla, Kasdi Merbah, BP ۵۱۱, Ouargla, Algeria

Tahar Idder

Department of Biology, Laboratory of Phoeniciculture Research, University of Ouargla, Kasdi Merbah, BP ۵۱۱, Ouargla, Algeria

Hamid Cheloufi

Department of Biology, Laboratory of Phoeniciculture Research, University of Ouargla, Kasdi Merbah, BP ۵۱۱, Ouargla, Algeria

Abdelhak Idder

Department of Biology, Laboratory of Phoeniciculture Research, University of Ouargla, Kasdi Merbah, BP ۵۱۱, Ouargla, Algeria

Slimane Ahmed Benmchi’h Ayada

High Commissionership for Development of the Steppe (HCDS), Djelfa, Algeria

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