摘要
通过短期实验,在微氧环境下考察了pH值对三价铁氨氧化(Feammox)性能的影响.结果表明,批式装置内初始NH_(4)^(+)-N和Fe^(3+)浓度分别为70.0和300.0mg/L.无Fe^(3+)投加时,活性污泥可以利用溶解氧进行氨氧化,NH_(4)^(+)-N去除量为8.8mg/L;加入Fe^(3+)后,NH_(4)^(+)-N去除量增至76.9mg/L,和未添加Fe^(3+)实验相比,活性污泥的NH_(4)^(+)-N去除量增加了7.7倍.通过长期实验考察了活性污泥Feammox反应器的脱氮性能和功能微生物.经过驯化,反应器的NH_(4)^(+)-N平均去除速率达到1.6mg N/(g VSS·d).典型周期内,pH值从9.0降至7.8,反应器内的NH_(4)^(+)-N从35.5mg/L降至1.9mg/L,NO_(2)^(-)-N从11.2mg/L增至18.1mg/L,NO_(3)^(-)-N从8.1mg/L增至13.4mg/L,总无机氮从54.8mg/L降至33.3mg/L.在成熟的Feammox污泥中,优势铁还原菌属及丰度分别为unclassified Acidobacteria(1.92%)和Pseudomonas(0.22%),这些菌属可能对于Fe^(3+)氧化氨氮起到了重要的作用.
In this study,the effect of pH value on Ferric ammonium oxidation(Feammox)performance was investigated under the micro oxygen environment through short-term experiments.The initial NH_(4)^(+)-N and Fe^(3+)concentrations in the batch experiment were 70.0 and 300.0mg/L,respectively.When no ferric iron was added,the activated sludge could use dissolved oxygen for ammonium oxidation,and the removal amount of NH_(4)^(+)-N was 8.8mg/L.After adding ferric iron,the removal amount of NH_(4)^(+)-N increased to 76.9mg/L.Compared with the experiment without adding ferric iron,the removal amount of NH_(4)^(+)-N in activated sludge increased by 7.7times.Moreover,the nitrogen removal performance and functional microorganisms of the activated sludge-Feammox reactor were investigated through long-term experiments.After acclimation,the average NH_(4)^(+)-N removal rate of the Feammox reactor reached 1.6mg N/(g VSS·d).In a typical cycle,the pH value decreased from 9.0 to 7.8,and the NH_(4)^(+)-N concentration decreased from 35.5mg/L to 1.9mg/L.The NO_(2)^(-)-N concentration increased from 11.2mg/L to 18.1mg/L,and the NO_(3)^(-)-N concentration increased from 8.1mg/L to 13.4mg/L.The total inorganic nitrogen(TIN)concentration decreased from 54.8mg/L to 33.3mg/L.In mature Feammox sludge,the dominant iron reducing bacteria were unclassified Acidobacter(1.92%)and Pseudomonas(0.22%),which might play an important role in ferric ammonium oxidation.
作者
李哲
李军
郑照明
LI Zhe;LI Jun;ZHENG Zhao-ming(National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,Engineering Research Center of Beijing,Beijing University of Technology,Beijing 100124,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2023年第7期3464-3471,共8页
China Environmental Science
基金
国家自然科学基金青年基金资助项目(5210101345)
北京市自然科学基金(8222039)。
关键词
活性污泥
厌氧铁氨氧化
不同pH值
快速富集策略
微生物群落解析
activated sludge
anaerobic iron ammonium oxidation
different pH
rapid cultivation strategy
microbial community analysis
