Résumés
Abstract
This work aimed to study the possibility of using plant matter, Opuntia ficus indica juice (OFIJ), for conditioning the Beni-Messous (Algiers) wastewater treatment plant sludge. The optimum dosage of OFIJ was found to be 0.4 g⋅kg‑1 of dry matter, for which the residual turbidity, the dryness of the filtration cake, and the specific resistance of filtration were found to be 2.5 NTU, 24% and 0.13⋅1012m⋅kg‑1, respectively. The results obtained with OFIJ are also compared with those of commercial polyelectrolytes such as Chimfloc C4346, a cationic polymer, Sedipur NF 400, a non-ionic polymer, and Sedipur AF 102, an anionic polymer, and inorganic conditioners such as FeCl3 and Al2(SO4)3. OFIJ proved to be the most efficient because the optimum dosage was found to be 0.4 g⋅kg‑1 of dry matter for OFIJ whereas for Chimfloc C4346, FeCl3 and Al2(SO4)3 the optimum doses were be found to be 0.8, 80 and 60 g⋅kg‑1. Based on the obtained results, OFIJ could be used as a natural conditioner in sewage sludge treatment.
Keywords:
- Coagulation,
- filtration,
- Opuntia ficus Indica,
- sludge,
- conditioning
Résumé
Ce travail avait pour but d’étudier la possibilité d’utiliser un matériau naturel d’origine végétale, le jus de cactus Opuntia ficus indica (OFIJ) dans le conditionnement des boues résiduaires de la station de traitement des eaux usées de Beni-messous (Alger). À la dose optimale de l’OFIJ (0,4 g⋅kg‑1 de MS) la turbidité résiduelle, la siccité du gâteau de filtration ainsi que la résistance spécifique à la filtration (RSF) étaient respectivement de 2,5 NTU, 24 % et 0,13⋅1012m⋅kg‑1. Les résultats obtenus avec le jus de cactus ont été comparés à ceux obtenus en utilisant des polyélectrolytes commerciaux à savoir le Chimfloc C4346, Sedipur NF 400 et Sedipur AF 102, et les sels minéraux FeCl3 et Al2(SO4)3. Les doses optimales pour Chimfloc C4346, FeCl3 et Al2(SO4)3 étaient de 0,8, 80 et 60 g⋅kg‑1 de MS. Les résultats obtenus sont très encourageants afin de substituer les conditionneurs chimiques par des produits naturels d’origine végétale.
Mots-clés :
- Coagulation,
- filtration,
- Opuntia ficus indica,
- boues,
- conditionnement
Parties annexes
References
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