温度对ANAMMOX生物膜工艺的脱氮影响与菌群结构分析 |
摘要点击 1795 全文点击 635 投稿时间:2021-05-27 修订日期:2021-06-28 |
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中文关键词 厌氧氨氧化(ANAMMOX) 温度 改性聚氨酯泡沫塑料填料 无纺布填料 微生物群落 |
英文关键词 anaerobic ammonium oxidation(ANAMMOX) temperature modified polyurethane foam carrier non-woven fabric carrier microbial community |
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中文摘要 |
针对厌氧氨氧化(anaerobic ammonium oxidation,ANAMMOX)工艺常低温运行问题,分别采用无纺布与改性聚氨酯泡沫塑料填料序批式生物膜反应器(sequence batch biofilm reactor,SBBR)处理含氮污水,考察了从35℃降至15℃过程的脱氮效果.结果表明,在进水氮容积负荷(NLR)为110 mg·(L·d)-1时,无纺布填料反应器的平均总氮(TN)去除率先由71.16%(35℃)提升至76.19%(30℃)后又降低至61.11%(15℃),而改性聚氨酯泡沫塑料填料的平均TN去除率先由78.71%(35℃)提升至81.75%(20℃)后又降低至75.68%(15℃).与无纺布填料相比,改性聚氨酯填料脱氮效果更稳定,可作为优选填料.对改性聚氨酯填料生物膜进行高通量测序,结果表明主要ANAMMOX菌属为Candidatus Kuenenia,相对丰度分别为8%(35℃)、5%(25℃)和16%(15℃),可见,低温条件下,Candidatus Kuenenia仍会增殖富集.降温显著影响了生物膜群落结构. |
英文摘要 |
For the ambient and low-temperature operation of the anaerobic ammonium oxidation (ANAMMOX) process, sequence batch biofilm reactors (SBBR) with non-woven fabric and modified polyurethane foam as carriers, respectively, were used to treat nitrogenous wastewater. Nitrogen removal performances of both reactors were investigated while the temperature decreased from 35℃ to 15℃. When the nitrogen loading rate (NLR) was 110 mg·(L·d)-1, the average total nitrogen (TN) removal rate of the non-woven fabric reactor increased from 71.16% (35℃) to 76.19% (30℃) and then decreased to 61.11% (15℃). The average TN removal rate of the modified polyurethane foam reactor increased from 78.71% (35℃) to 81.75% (20℃) and then decreased to 75.68% (15℃). Compared with the non-woven fabric, the modified polyurethane foam provided a more stable nitrogen removal performance and could be used as the preferred carrier. High-throughput sequencing of the modified polyurethane foam biofilm indicated that Candidatus Kuenenia was the dominant ANAMMOX genus, with relative abundances of 8% (35℃), 5% (25℃), and 16% (15℃). Candidatus Kuenenia still grew and enriched at low temperatures. The decrease in temperature significantly affected the biofilm microbial community structure. |