不同基质浓度对ANAMMOX菌短期储存的影响 |
摘要点击 2507 全文点击 1083 投稿时间:2018-05-12 修订日期:2018-05-30 |
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中文关键词 厌氧氨氧化(ANAMMOX) 基质浓度 短期储存 活性恢复 内源呼吸 |
英文关键词 anaerobic ammonium oxidation (ANAMMOX) substrate concentration short-term storage activity recovery endogenous respiration |
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中文摘要 |
在15℃±1℃条件下,将厌氧氨氧化菌混培物分别置于基质浓度为0、60、120 mg·L-1添加比例为1:1的NH4+-N和NO2--N环境中短期(15 d)储存,探究不同基质浓度对厌氧氨氧化污泥短期保存及恢复的影响.经过短期储存后进行恢复实验,结果表明,1、2、3号反应器(分别对应0、60、120mg·L-1基质浓度中储存的厌氧氨氧化菌混培物)中的厌氧氨氧化活性分别下降41.8%、17.4%、33.4.%,1、3号分别由于过度内源呼吸和高基质浓度抑制,导致活性下降较大,2号反应器由于基质浓度相对合适,避免了过度内源呼吸和高基质浓度抑制,使得菌种活性在该基质浓度下保留较好;储存期间,3个反应器内均发生内源呼吸消耗自身有机物的情况,导致EPS含量下降50.9%、41.7%、23.7%和粒径下降31.6%、16.7%、8.2%,表明在基质匮乏期菌体通过内源呼吸的方式维持自身的活性,较高的基质浓度可以在一定程度上延缓内源呼吸过程;在恢复期间,3个反应器分别经过15、10、7 d实现脱氮性能和厌氧氨氧化活性的恢复,表明同菌种增殖富集相比,原系统通过菌种活性增强的方式脱氮性能恢复更快. |
英文摘要 |
Anaerobic ammonium oxidizing bacteria were stored under NH4+-N and NO2--N conditions (addition ratio 1:1) at a substrate concentration of 0, 60, and 120 mg·L-1at 15℃±1℃ for 15 days. The effect of different substrate concentrations on the short-term storage and recovery of anaerobic ammonia oxidation sludge was investigated. After a short period of storage, a recovery experiment was performed. The results show that the anaerobic ammonia oxidation activities in the reactors 1, 2, and 3 decrease by 41.8%, 17.4%, and 33.4%, respectively. Because of the excessive endogenous respiration and high substrate concentration, the activities of the bacteria in reactors 1 and 3 were inhibited, respectively. Therefore, the activities decreased greatly. Because the substrate concentration was relatively suitable in reactor No. 2, excessive endogenous respiration and high substrate concentration inhibition were avoided such that the activity of the bacteria species was maintained at the substrate concentration. Endogenous respiration occurred during the storage period. Subsequently, the organic matter in the three reactors was consumed. As a result, the EPS content decreased by 50.9%, 41.7%, and 23.7% and the particle size decreased by 31.6%, 16.7%, and 8.2%, respectively. This shows that endogenous respiration is maintained by the bacteria in the matrix-deficient period and the higher concentration of the substrate can to some extent delay the endogenous respiration. During the recovery period, the three reactors recover the denitrification performances after 15, 10, and 7 d respectively. This shows that the denitrification performance of the system has a faster recovery through enhanced strain activities compared with the proliferation of the strain. |
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