| Titre : |
Biodegradation of lecithin-based fatliquor : optimization of food to microbes ratio and residence time |
| Type de document : |
texte imprimé |
| Auteurs : |
Chitra Kalyanaraman, Auteur ; K. Sri Bala Kameswari, Auteur ; V. Sudharsan Varma, Auteur ; R. Priyadharsini, Auteur ; Jonnalagadda Raghava Rao, Auteur |
| Année de publication : |
2013 |
| Article en page(s) : |
p. 1-10 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Eaux usées -- Analyse
Lécithine -- Biodégradation
Produits de nourriture du cuir
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Oils are usually applied as aqueous emulsions in the fatliquoring process and they influence the physical characteristics of leather, such as tensile strength, extensibility, wetting properties, water-proofness and permeability to water vapour and air. During soybean oil processing, phospholipids are recovered from the degumming process to produce lecithin. The sulfonated phospholipids exhibit good hydrophilic properties, emulsifying properties and good permeability. They are therefore used in the tanneries as semi-synthetic fatliquor. Exhaustion of fatliquor was about 85 to 90% and the remaining was discharged in to the process water as wastewater. Grease traps fail to retain dissolved and emulsified fats efficiently, allowing them to enter the water treatment system. These lipids may then interfere with aerobic biological wastewater treatment processes by reducing oxygen transfer rates. The aim of the present study was to assess the rate of biodegradability of lecithin-based fatliquor containing wastewater generated from tanneries at various food to microbial (f/m) ratios of 0.35, 0.25 and 0.15 in aerobic batch reactors. Optimization of the f/m ratio and residence time was investigated in detail and the results established that a f/m ratio of 0.15 with residence time of 48 hours is needed for obtaining maximum biodegradation. Soluble Biochemical Oxygen Demand (SBOD) and Soluble Chemical Oxygen Demand (SCOD) removal efficiencies were 95.55% and 86.21%, which resulted in 28 and 240 mg/L in the treated effluent. It was evident from FT-IR and ESI-MS analysis that the phospholipids are degraded efficiently in the batch reactor. |
| Note de contenu : |
- MATERIALS AND METHODS : Characterization of lecithin-based semi synthetic fatliquor - Experimental setup for biodegradation studies - Fourier transform infrared spectrometry (FT-IR) analysis - Electrospray ionisation mass spectrometry (ESI-MS) analysis
- RESULTS AND DISCUSSION : Characteristics of semi synthetic lecithin based fatliquor - Optimization of food to microbial (f/m) ratio - Evaluation of FT-IR spectrum before and after aerobic treatment - Electrospray ionisation mass spectroscopy (ESI-MS) analysis of lecithin-based fatliquor - Electrospray ionisation mass spectroscopy (ESI-MS) analysis on aerobic treated lecithin-based fatliquor |
| En ligne : |
https://drive.google.com/file/d/1HVKMu5_yXga6UK8Dt6Vk2j9cjh-ZI-bD/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16922 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 1 (01/2013) . - p. 1-10
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