摘要
研究了原皮保藏、浸水、脱毛和复灰等制革过程中氨氮的产生情况,分析了这些工序有机氮(蛋白质)转化为氨氮的原因。结果表明:在原皮保藏和浸水过程中,氨氮主要来源于微生物对皮中有机氮的分解。灰碱烂毛工序中毛角蛋白会分解产生氨氮,而酶脱毛(保毛脱毛)工艺能够显著降低废水中的氨氮含量。在浸灰/复灰的强碱性条件下,皮蛋白质的侧链酰胺基会水解生成少量氨氮。
The content of ammonia nitrogen generated from curing, soaking, unhairing and reliming operations was determined by distillation - titration method. The origin of ammonia nitrogen derived from organic nitrogen was investigated. The results show that skin proteins could be degraded into ammonia nitrogen through ammonification of microorganism during curing and soaking. Ammonia nitrogen is generated in the hair - burning process due to the decomposition of hair keratin, while the content of ammonia nitrogen in wastewater decreases remarkably by using enzymatic unhairing. In liming/reliming operations, ammonia nitrogen is mainly originated from the hydrolysis of the amide side - chains of protein.
出处
《中国皮革》
CAS
北大核心
2010年第1期2-5,共4页
China Leather
基金
国家科技支撑计划(2006BAC02A09)资助项目
关键词
氨氮
制革废水
有机氮
蛋白质
ammonia nitrogen
tannery wastewater
organic nitrogen
protein
