BIODEGRADABILITY EVALUATION OF TYPICAL LEATHER CHEMICALS (II)-THE BIODEGRADATION BEHAVIOURS OF ORGANIC TANNING AND RETANNING AGENTS ON ACTIVATED SLUDGE
首发时间:2010-01-13
Abstract:The biodegradabilities of three kinds of typical organic tanning and/or retanning agents, namely aromatic syntans, aldehyde tanning agents and acrylic syntans, were studied in this paper. The results showed that the biodegradation behaviours of the leather chemicals are closely associated with their molecular weight and structure together with their chemical composition. It is suggested that the employment of organic tanning and/or retanning agents in leather industry might result in different environmental impacts even for the same kind of syntans. The tested four aromatic syntans (SGP, PGP, KWOP and BS) exhibited different but generally low biodegradability. The phenol syntan SGP could not be biodegraded, and the phenol-sulphone syntan PGP exhibited strong inhibitory effects on activated sludge respiration. Comparatively, the naphthalene syntan BS and the phenol syntan KWOP showed somewhat better biodegradability. In the case of aldehyde tanning agents, both formaldehyde and glutaraldehyde are toxic to activated sludge organisms, and comparatively the latter is potential to cause more severe environmental problem when it was used in leather industry. However, an aliphatic aldehyde product, namely syntan SH, did not show toxicity to activated sludge and it was biodegradable when it was at the concentrations tested. As far as acrylic syntans were concerned, the results indicated that the commercial anionic products (R83, B7815, ART-I and ART-II) were not so much inhibitory but were hardly biodegraded. However, a cationic product ART-III is potential to inhibit the activated sludge process in the effluent treating yard of tannery when it presented at high content.
keywords: tanning agent activated sludge biodegradability BOD
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典型制革化学品的生物降解特性研究-鞣剂的可生物降解性研究(英文)
摘要:本文对制革生产中几种典型有机鞣剂和复鞣剂(芳香族鞣剂、醛类鞣剂、丙烯酸类鞣剂)的可生物降解性进行了研究,结果表明这些化学品的生物降解行为与其分子量和分子结构密切相关,即使同类鞣剂其环境影响也可能完全不同。研究发现,所测试的四种芳香族合成鞣剂其生物降解性都较差,其中萘类合成鞣剂BS3和酚类替代型合成鞣剂KWOP其可生化性相对较好,而酚类替代性合成鞣剂SGP难以生物降解,特别是酚-砜替代型合成鞣剂PGP对活性污泥显示了较强的抑制作用。甲醛和戊二醛都具有一定的微生物毒性,难以生化处理,而活性污泥可以降解脂肪醛 SH。研究表明,阴离子型的丙烯酸类鞣剂R83、B7815、ART-I 和ART-II对活性污泥没有毒性,但难以生物降解,而阳离子型的ART-III对活性污泥显示了较强的抑制作用。
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No.3888138520712633****
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典型制革化学品的生物降解特性研究-鞣剂的可生物降解性研究(英文)
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