为了探讨2-巯基苯并噻唑(MBT)的生物降解性,借鉴浮选捕收剂等有机物的生物降解性评价体系,分别采用静置烧瓶筛选试验法、震荡培养法(GB/T 15818-2006)、改良斯特姆法(OECD-301B)3种评价方法首次对MBT的生物降解性进行探讨.结果表明:在静置烧瓶筛选试验法中,MBT在第4周期的生物降解度为4.68％;在震荡培养法中,MBT的8d生物降解度为28.9％;在改良斯特姆法中,MBT的生物降解性指数IB为77.07,相对降解度(DRBD)为35.49％.这3种评价方法得出的结论一致表明MBT属于难生物降解有机物,对微生物有一定毒害作用,抑制微生物的生长.本研究可为MBT的环境行为以及含MBT废水的生物处理技术提供基础资料.
The biodegradability of 2-Mercaptobenzothiazole (MBT) was evaluated by the methods of static flask screening tests,oscillating culture method(GB/T 15818-2006) and modified Sturm test (OECD-301B) according to the testing standard for biodegradability of flotation reagents and other organic compounds.The results show that the removal rate of MBT is 4.68％ in the forth cycle in the static flask screening tests.In oscillating culture method,the removal rate of MBT is 28.9％ in 8 days.The biodegradability index (IB) of MBT is 77.07 and the relative degradation degree (DRBD) is 35.49％ in the modified Sturm test.All the results indicate that MBT is a refractory biodegradable organic matter,which has certain toxicity to microorganisms and can inhibit the growth of microorganisms.The results of this study can provide a basis for the environmental behavior and the biological treatment technology of wastewater which contains MBT.
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