Analysis of acclimation behavior against nitrification inhibitors in activated sludge processes

Xiaojing Xiong, Makoto Hirata, Hirokazu Takanashi, Min-Gyu Lee , Tadashi Hano
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引用次数: 12

Abstract

The acclimation behavior of activated sludge against nitrification inhibitors was explored by continuously adding thiourea and/or aniline to unacclimated sludge. Thiourea, which is difficult to biodegrade, severely inhibited the ammonia oxidation step, whereas aniline inhibited both the ammonia and nitrite oxidation steps and its biodegradation by nitrifying sludge was possible after a short acclimation period. Since thiourea-acclimated sludge showed higher tolerance than unacclimated sludge, the recovery of complete nitrification after being in contact with thiourea over a long period was attributed not only to the acquisition of biodegrading ability but also to the tolerance acquired by the sludge. Once both biodegrading ability and tolerance were acquired, they remained even after stopping the addition of thiourea for several weeks. In contrast, aniline-acclimated sludge was suspected to acquire only biodegrading ability.

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活性污泥法对硝化抑制剂的驯化行为分析
通过在未驯化的污泥中连续添加硫脲和/或苯胺,探讨了活性污泥对硝化抑制剂的驯化行为。硫脲对氨氧化反应有较强的抑制作用,而苯胺对氨氧化和亚硝酸盐氧化反应均有抑制作用,短时间驯化后可被硝化污泥降解。由于硫脲驯化污泥比未驯化污泥表现出更高的耐受性,因此长期接触硫脲后完全硝化的恢复不仅归因于生物降解能力的获得,而且归因于污泥获得的耐受性。一旦获得了生物降解能力和耐受性,即使停止添加硫脲几周后,它们仍然存在。相比之下,苯胺驯化污泥被怀疑只获得生物降解能力。
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