| Résumé : |
Contamination of used soak/unhairing baths by nitrogen in comparison with carbon and soluble protein contents --- The leather industry generates highly contaminating liquid effluents with current process methods. In this work, the contamination by nitrogen in wastewater was evaluated for two of the most nitrogen generating steps of beamhouse processing, the soaking and the unhairing/liming steps. Total Kjedahl nitrogen (TKN), ammoniacal nitrogen (N-NH3), total organic carbon (TOC) and soluble protein analyses were realized from bath samples collected at varying times. It was observed that in long duration soaking, nitrogen liberation to the bath eventaully levels out whilst, in unhairing/liming, the nitrogen content did not stabilize even with 27 hours processing.
It was possible to observe a relatioship between nitrogen liberation, TOC and soluble protein contents of the soaking baths. |
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Contamination of used soak/unhairing baths by nitrogen in comparison with carbon and soluble protein contents in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 1 (01-02/2011)
