摘要
采用化学共沉淀法制备了载铁颗粒活性炭复合材料(Fe-GAC),研究了常温无NO_(2)^(-)环境下其对厌氧氨氧化体系中氮素变化的影响,并进一步分析了材料反应前后变化及厌氧氨氧化体系中的微生物特性。结果表明,Fe-GAC的投加促进了NH_(4)^(+)-N的去除,且以Fe(Ⅲ)与Fe(Ⅱ)物质的量比为1∶2制备的Fe-GAC(1∶2)投加体系对NH_(4)^(+)-N的去除效果最显著,NH_(4)^(+)-N去除率达(56.5±12.3)%,平均去除率较空白体系提升了24.3%;结合材料表征、NH_(4)^(+)-N去除率及NO_(2)^(-)、NO_(3)^(-)产物生成结果,推测Fe-GAC中的铁作为电子受体参与了厌氧氨氧化过程;此外,相较于其他体系,Fe-GAC(1∶2)投加体系中厌氧氨氧化菌属unclassified_Candidatus_Brocadiaceae的相对丰度提升最显著,由原始污泥的45.6%升至57.2%,且独有OTU数目最多,微生物群落最丰富,有利于体系的厌氧氨氧化过程。
We prepared iron-loaded granular activated carbon(Fe-GAC)by a chemical co-precipitation meth-od,and studied its influence on nitrogen change in anaerobic ammonia oxidation system without addition of NO_(2)^(-) at ambient temperature.Moreover,we further analyzed the changes of Fe-GAC before and after reaction and the microbial characteristics in anaerobic ammonia oxidation system.The results show that the addition of Fe-GAC promotes the removal of NH_(4)^(+)-N,and the addition system of Fe-GAC(1∶2)prepared with the molar ratio of Fe(Ⅲ)to Fe(Ⅱ)of 1∶2 has the most significant removal effect on NH_(4)^(+)-N with the removal rate of NH_(4)^(+)-N of(56.5±12.3)%,the average removal rate of whose increases by 24.3%compared with the blank system.Combined with the material characterization,the removal rate of NH_(4)^(+)-N,and the formation of NO_(2)^(-) and NO_(3)^(-) products,it is speculated that iron in Fe-GAC participates in the anaerobic ammonia oxidation process as an electron acceptor.In addition,compared with other systems,the relative abundance of AnAOB unclassified_Candidatus_Brocadiaceae in Fe-GAC(1∶2)addition system increases most significantly,from 45.6%(origi-nal sludge)to 57.2%,and the number of unique OTU and microbial community are the most abundant.It is beneficial to the anaerobic ammonia oxidation process in the system.
作者
管雨璐
许美兰
李睿
徐苏
王明辉
GUAN Yulu;XU Meilan*;LI Rui;XU Su;WANG Minghui(School of Environmental Science and Engineering,Xiamen University of Technology,Xiamen 361024,China)
出处
《化学与生物工程》
北大核心
2025年第3期42-48,55,共8页
Chemistry & Bioengineering
基金
福建省自然科学基金项目(2020J01257)
厦门市产学研项目(2022CXY0423)。
