| Titre : |
Efficient removal of ammonia-nitrogen from deliming effluent by using magnesium ammonium phosphate precipitation method |
| Type de document : |
texte imprimé |
| Auteurs : |
Hao Wang, Auteur ; Chao Lei, Auteur ; Yunhang Zeng, Auteur ; Hongguang Guo, Auteur ; Bi Shi, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 104-112 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Azote ammoniacal
Caractérisation
Cuirs et peaux
Déchets industriels -- Elimination
Eaux usées -- Epuration
pH
Phosphate d'ammonium
Phosphate de magnésiumLe terme phosphate de magnésium est le nom générique pour les sels inorganiques de magnésium issus de l'acide phosphorique. Leur formule est :
- le dihydrogénophosphate de magnésium (Mg(H2PO4)2) ;
- l'hydrogénophosphate de magnésium (MgHPO4) ;
- le phosphate de magnésium (proprement dit) ou phosphate de trimagnésium (Mg3(PO4)2
Ils incorporent éventuellement des molécules d'eau de cristallisation ; par exemple, le phosphate de magnésium tribasique (Mg3(PO4)2⋅nH2O) peut contenir 4, 5 ou 8 molécules d'eau. La bobierrite (it) est la forme minérale naturelle du phosphate de magnésium octahydraté.
L'hydrogénophosphate de magnésium trihydraté se présente sous la forme d'une poudre blanche cristalline. La newbéryite est sa forme minérale naturelle.
Les phosphates de magnésium entrent dans la composition du tissu osseux. (Wikipedia)
Précipitation (chimie)
Tannage -- Déchets
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Ammonia nitrogen (NH 3 -N) pollutant has received much attention in the leather industry. An efficient strategy for removal of NH 3 -N from tannery wastewater was proposed by using a magnesium ammonium phosphate (MAP) precipitation method to remove NH 3 -N from deliming effluent with the highest NH 3 -N concentration among all leather-making effluents. Results showed that approximately 80% of NH 3 -N was removed from deliming effluent when reacting at P/Mg/N mole ratio of 1.2:1.2:1.0 and pH 9.5 for 20 min. The NH 3 -N and total nitrogen concentrations of tannery wastewater (a composite wastewater of all leather-making effluents) sharply decreased by treating deliming effluent with MAP precipitation, which greatly improved the biological treatment efficiency of tannery wastewater. The residual concentration of NH 3 -N in the treated tannery wastewater was less than 2 mg/L. The total phosphorus concentration of tannery wastewater increased by less than 0.4 mg/L, indicating that secondary pollution of phosphorus did not occur after MAP precipitation treatment. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Effect of pH adjustment method on NH3-N removal efficency - Optimization of MAP precipitation method for removal of NH3-N from deliming effluent - Effect of P/N - Effect of Mg/N - Effect of reaction pH - Effect of reaction time - X-ray diffraction analysis of precipitate - Aerobic bological treatment of simulated tannery wastewater
- RESULTS AND DISCUSSION : Effect of pH adjustment method on NH3-H removal efficiency - Effects of reaction conditions on the removal of NH3-N from deliming effluent byusing MAP precipitation method - Characterization of precipitation - Effect of MAP precipitation method on the biological treatment of tannery wastewater
- Table 1 : Wastewater sampling from leather-making procedures
- Table 2 : Effect of pH adjustment method on nH3-N removal efficiency
- Table 3 : Concentrations of NH3-N, TOC, TN, and TP in simulated tannery wastewater before and after aerobic biological treatment |
| En ligne : |
https://drive.google.com/file/d/1x6437XHaUBXbfG44KKIBz68wrvyhOs4J/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37601 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 3 (03/2022) . - p. 104-112
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Efficient removal of ammonia-nitrogen from deliming effluent by using magnesium ammonium phosphate precipitation method in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 3 (03/2022)
