• 关键词：降解速率  半连续流  固有菌  高效菌  4-氯酚  2,4-二氯酚

• 基金项目：国家自然基金资助项目(29637010)

• 全向春
• 清华大学环境科学与工程系,环境模拟与污染控制国家重点联合实验室,北京 100084

• 施汉昌
• 清华大学环境科学与工程系,环境模拟与污染控制国家重点联合实验室,北京 100084

• 王建龙
• 清华大学环境科学与工程系,环境模拟与污染控制国家重点联合实验室,北京 100084

• 钱易
• 清华大学环境科学与工程系,环境模拟与污染控制国家重点联合实验室,北京 100084

• 摘要：采用生物强化技术降解废水中的难降解有机物2, 4-二氯酚(简称2, 4-DCP), 研究了不同浓度的4-氯酚(简称4-MCP)存在对2, 4-DCP降解的影响, 并通过半连续流实验研究了4-MCP长期存在下, 强化系统中2, 4-DCP和4-MCP降解速率的变化趋势.结果表明, 第1次半连续流实验中, 4-MCP浓度为5、10、20及30mgL时, 都会对强化系统中2, 4-DCP的降解速率产生一定的抑制作用, 而且抑制作用随着4-MCP浓度的增加而增强.随着半连续流实验次数的增加, 4-MCP对2, 4-DCP降解的抑制作用减弱甚至消失, 共基质时2, 4-DCP的降解速率反而比其单基质半连续流运行时快.4-MCP与2, 4-DCP共基质存在时, 2, 4-DCP优先被微生物利用, 此后4-MCP才被降解, 表现出两阶段降解的现象.

• Abstract：In a bioaugmented system with special culture supplemented for the removal of 2,4-Dichlorophenol (2,4-DCP), effects of 4-chlorophenol (4-MCP) presences at various concentrations in the system on the biodegradation of 2,4-DCP were studied. In addition, the changes of the removal rate of 2,4-DCP and 4-MCP in the mixture were investigated under fed-batch test. Results showed that the presence of 4-MCP at the concentration of 5mg/L, 10mg/L, 20mg/L and 30mg/L inhibited the biodegradation rate of 2,4-DCP and the inhibition increased with the increase of 2,4-DCP concentrations in the first run of fed-batch test. Whereas, in the second and third runs of the test, inhibition of 4-MCP to the biodegradation of 2,4-DCP decreased and even disappeared for the adaptation of the microorganisms in the bioaugmented system, and 2,4-DCP in the mixture with 4-MCP was degraded faster than the control one. 2,4-DCP was preferably utilized by the microbial in the bioaugmented system and 4-MCP was degraded thereafter, thus bi-phase biodegradation was observed.

• Key words：biodegradation rate  fed-batch test  indigenous culture  special culture  4-chlorophenol  2,4-dichlorophenol

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