酶助浸水、脱毛工艺的环境友好性研究-基于废液生物降解特性的评价
首发时间:2009-01-05
摘要: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)的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。活性污泥作用5 d 后,ESU和CSU废液的降解率分别为44.1%和39.8%,而自发降解20 d后,它们的降解率分别为58.5%和37.7%。基于活性污泥的呼吸氧耗,建立了废液的降解模型,进一步研究了ESU和CSU废液的生物降解动力学特性。结果表明,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。
关键词: 制革 环境友好性 浸水 脱毛 废水 可生物降解性 酶
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Environmental Friendliness of Enzymatic Soaking and Unhairing Processes. Part 2: The Evaluation based on Biodegradability of Wastewater
Abstract:This paper is concerned with the biodegradability of enzymatic soaking and unhairing (ESU) wastewater, in comparison with the wastewater collected from conventional soaking and unhairing (CSU) operations in leather processing. The results show a better biodegradability of ESU wastewater both in the presence and absence of activated sludge. ESU and CSU wastewater reached 44.1% and 39.8% of biodegradation in 5 days of activated sludge process, while their biodegradation extents were 58.5% and 37.7% within 20 days without the application of activated sludge, respectively. Further, the biodegrading process was modeled based on the oxygen uptake of activated sludge. It is indicated that activated sludge can adapt to ESU more easily than to CSU wastewater, and that 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.
Keywords: leather-making process environmental friendliness soaking unhairing wastewater biodegradability enzyme
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No.2729338520712311****
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