2-羟基-3-萘甲羟肟酸(H_(205))的厌氧生物降解性试验研究

Experimental Research on Biodegradability of 2-hydroxy-3-naphthalene Hydroxamic Acid H_(205) Under Anaerobic Conditions

采用摇瓶振荡培养法,研究了2-羟基-3-萘甲羟肟酸(H205)在4种厌氧条件下的生物降解性。结果表明:在整个试验周期内,各种非生物因素对H205的厌氧生物降解过程的影响可忽略不计。H205在反硝化、硫酸盐还原与Fe(Ⅲ)还原体系中的生物降解效率优于一般厌氧处理。H205在不同的厌氧条件下的降解速率由低到高依次为一般厌氧处理、硫酸盐还原处理、反硝化处理以及Fe(Ⅲ)还原处理。Fe(Ⅲ)是H205厌氧生物降解的最适宜电子受体。H205在不同厌氧条件下的生物降解都符合一级动力学模型,一般厌氧条件、反硝化条件、硫酸盐条件和Fe(Ⅲ)条件下的动力学方程分别为C=29.86e0.014 77 t,C=29.91e0.042 76 t,C=29.89e0.026 23 t,C=29.95e0.055 97 t。最后初步探讨了H205的厌氧生物降解机理。

The biodegradability of 2-hydroxy-3-naphthalene hydroxamic acid（H205） was investigated by shaking-bottle incubating tests under four anaerobic conditions.The result indicated that： in the whole test period,the influence of various non-biological factors on the biodegradation of H205 under the anaerobic conditions can be ignored.Under three reductive conditions such as denitrification,sulfate reduction and Fe（Ⅲ） reduction the biodegradation rates of H205 were higher than that under general anaerobic condition.The increasing order of the biodegradation rate of H205 was as follows： general anaerobic treatment,sulfate-reducing treatment,nitrate-reducing treatment and Fe（Ⅲ）-reducing treatment.Ferric iron was a more favorable terminal electron acceptor compared to nitrate and sulfate for biodegradability of H205.The biodegradation of H205 followed the first order reaction kinetics equation under general anaerobic,nitrate-reducing,sulfate-reducing and Fe（Ⅲ）-reducing conditions.The respective biodegradation reaction kinetics equations are C=29.86e0.014 77t,C=29.91e0.042 76t,C=29.89e0.026 23t,C=29.95e0.055 97t.Finally,the non-biodegradation mechanism of H205 was preliminarily explored.