在DNRA增强的MABR-PN/A混合系统中,对氧化和残留酸盐进行协同抑制
Jiao Yin1, Haotian Jiang1, Linhong Qiu1
1State Key Laboratory of Urban-rural Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, PR China.
Water research
|July 22, 2025
概括
一个铁碳系统通过促进仿真和抑制N2O排放,在MABR-PN/A系统中增强了酸盐-的去除. 添加Anammox进一步改善了去除和减少了温室气体的产生.
科学领域:
- 环境科学与工程环境科学与工程
- 微生物学 微生物学
- 水处理 处理水的方法
背景情况:
- 酸盐- (NO3 - - N) 积累在自营去除系统中是一个挑战,例如与部分化-阿纳莫克斯 (MABR-PN/A) 结合的膜气化生物反应器.
- 分离性酸盐降解为 (DNRA) 和脱是去除的关键过程,但它们的效率可能有限.
研究的目的:
- 开发一种铁-碳 (IC) 介导系统,以增强NO3--N异型化和减轻MABR-PN/A过程中的NO3--N积累.
- 研究IC刺激对微生物酶活动和转化途径的影响,包括氧化 (N2O) 排放.
- 评估IC和Anammox细菌对去除效率和N2O缓解的协同作用.
主要方法:
- 开发一种铁碳 (IC) 介导的MABR-PN/A系统 (IC-MABR-PN/A).
- 微生物酶活动的分析,特别是酸盐离合酶 (Nrf) 和酸盐减少酶 (Nir),以及氨酸合成酶 (Hzs) 和氧化减少酶 (Nor).
- 在不同的操作条件下 (有或没有AnAOB) 量化物种 (NO3--N,NO2--N,NH4+-N,TN) 和N2O排放量.
主要成果:
- 没有AnAOB的IC-MABR-PN增加了11.86±0.68 mg/L的NO3--N异样化,这是由于Nrf的积累和对NO2--N的更强烈竞争.
- 在IC-MABR-PN中,IC刺激加强了脱,减少了总 (TN) 6.48±0.28 mg/L,但增加了N2O积累.
- 在与AnAOB的IC-MABR-PN/A中,Hzs表现出比Nor更强的结合亲和力,有利于NO竞争和抑制N2O通路,将排放量减少到九分之一.
- 安纳莫克斯调节了生物膜的疏水性,增强了转移,减轻了IC诱导的影响.
结论:
- IC-MABR-PN/A系统有效地促进了协同的NO3--N去除和N2O减少.
- 通过IC介导的NO3 - - N离合和Anammox竞争是提高去除和温室气体减排的关键机制.
- 这项研究提供了一种有前途的策略,用于提高废水处理中自营去除效率.
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