酶助浸水、脱毛工艺的环境友好性研究(Ⅱ)——基于废液生物降解特性的评价

Environmental Friendliness of Enzymatic Soaking and Unhairing Processes(Ⅱ):evaluation based on biodegradability of wastewater

以制革准备工段中传统浸水、脱毛工艺(CSU)为对照,对酶助浸水、脱毛工艺(ESU)废液的生物降解特性进行了研究。结果表明:无论是活性污泥作用下降解,还是自发降解,ESU废液的生物降解性都优于CSU废液。活性污泥能更快地适应ESU废液,同时ESU比CSU废液具有更高的可生物降解程度;ESU废液中65.5%的COD可以通过生物降解得以去除,而CSU废液的可生物降解率为58.2%。酶助浸水脱毛废液良好的可生物降解性说明,在制革准备工段采用酶处理工艺比传统的化学浸水、脱毛工艺具有更好的环境友好性。

The biodegradability of enzymatic soaking and unhairing （ESU） wastewater was investigated in comparison with the wastewater collected from conventional soaking and unhairing （CSU） operations in leather processing. The results show that a better biodegradability of ESU wastewater both in the presence and absence of activated sludge which can adapt to ESU more easily than to CSU wastewater. 65.5 % of the total oxygen - consuming compounds in ESU wastewater are biodegradable, while the ratio of CSU wastewater is 58.2%. Therefore, in terms of the biodegrading properties of ESU and CSU wastewater, it can be concluded that enzymatic soaking and unhairing processes are more environmentally friendly than corresponding chemical processes in leather industry.