期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：2009
卷号：20
期号：4
页码：367-372
DOI：10.1684/sec.2009.0207
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Mahamane Sani Laouali , Sanoussi Atta , Harouna Abdoulaye , Zoubeyrou Alzouma , Germaine Ibro , Dahiratou Marafa , Mamane Saadou Université Abdou Moumouni Faculté des sciences Département de chimie 10662 Niamey Niger, AGHRYMET Centre régional AGRHYMET BP 11011 Niamey Niger, Inran BP 429 Niamey Niger, École normale supérieure BP 10963 Niamey Niger Key words: fuelwood, fodder, wastewater DOI : 10.1684/sec.2009.0207 Page(s) : 367-72 Published in: 2009 A wastewater station with a capacity of 60 m 3 per day was built at the experimental site of the Faculty of Sciences, University of Niamey, in order to treat and optimise wastewater from the student city to produce fuelwood and fodder. The wastewater was purified using the naturally aerated lagoon system followed by filtration through a bed of gravel. The results indicated that purified wastewaters were free of heavy metals. Furthermore, they had a mean concentration of 32 mg/L of suspended matter, 45 mg/L of ammoniacal nitrogen and 7.2 of orthophosphates. In addition an abatement of 4.5 log units for fecal coliforms was recorded. We studied fuelwood and fodder yields for three forest species (Acacia angustissima, Acacia crassicarpa and Gliricidia sepium) irrigated with the wastewaters. Yields were measure after a two-year period and then three months after the first pruning. After the 2-year growth, fodder yields were approximately 1,655 kg of dry matter/ha, 2,630 kg/ha, and 9,200 kg/ha and corresponding fuelwood yields of 48 steres, 76 steres and 80 steres for G. sepium, A. angustissima and A. crassicarpa, respectively. The second pruning was carried out three months after the first and produced 1,015 kg of dry matter/ha, 2,455 kg/ha and 2,950 kg/ha for A. angustissima, G. sepium and A. crassicarpa with 8.92 steres, 12.94 steres and 6.96 steres respectively in terms of fuelwood.
