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Roles of hydroxylamine and hydrazine in the in-situ recovery of one-stage partial nitritation-anammox process: Characteristics and mechanisms.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2019-11-20 , DOI: 10.1016/j.scitotenv.2019.135648 Qianwen Sui 1 , Yuanyue Wang 1 , Hongyan Wang 2 , Wenhui Yue 2 , Yanlin Chen 2 , Dawei Yu 1 , Meixue Chen 1 , Yuansong Wei 3
Science of the Total Environment ( IF 8.2 ) Pub Date : 2019-11-20 , DOI: 10.1016/j.scitotenv.2019.135648 Qianwen Sui 1 , Yuanyue Wang 1 , Hongyan Wang 2 , Wenhui Yue 2 , Yanlin Chen 2 , Dawei Yu 1 , Meixue Chen 1 , Yuansong Wei 3
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Nitrate built-up is a serious operational difficulty in one-stage partial nitritation anammox (PN/A) process. To investigate an effective method for in-situ restoration, hydroxylamine (NH2OH) and hydrazine (N2H4) of 2 mgN/L were dosed in PN/A process with nitrate built-up in a comparative study. NH2OH treatment showed better performances on TN removal and nitrate reduction than N2H4 and blank control. Through 104 days' addition of NH2OH, MRNN (mole ratio of NO3--N production to NH4+-N removal) was decreased from 70% to 19.91%; TN removal was increased from 0.01 to 0.18 kgN/(m3 d). After stopping the chemical addition, nitrate rebounded for N2H4 treatment, but the restoration effect was stable and persistent for NH2OH. NH2OH addition resulted in a low reductive potential (-250 mV) and exerted strong inhibitions on nitrite oxidizing bacteria activities. Additionally, rapid enhancement of ammonia oxidizing bacteria activities, functional gene (hao) and Nitrosomonas gave rise to the restoration of PN/A with NH2OH addition.
中文翻译：
羟胺和肼在一阶段部分硝化-氨氧化过程的原位回收中的作用：特征和机理。
硝酸盐累积是一阶段部分硝化厌氧氨氧化（PN / A）工艺中的一个严重操作难题。为了研究一种有效的原位修复方法，在PN / A过程中，通过硝酸盐积累的方法，在PN / A过程中加入了2 mgN / L的羟胺（NH2OH）和肼（N2H4）。NH2OH处理显示出比NH2H4和空白对照更好的TN去除和硝酸盐还原性能。通过添加NH2OH 104天，MRNN（NO3--N生成与NH4 + -N去除的摩尔比）从70％降低到19.91％；TN去除量从0.01增加到0.18 kgN /（m3 d）。停止化学添加后，硝酸盐反弹回用于N2H4处理，但对NH2OH的恢复效果稳定且持久。NH2OH的添加导致还原电位低（-250 mV），并对亚硝酸盐氧化细菌的活性产生强烈的抑制作用。此外，氨氧化细菌活性，功能基因（hao）和亚硝化单胞菌的快速增强导致加入NH 2 OH可恢复PN / A。
更新日期：2019-11-20
中文翻译：
羟胺和肼在一阶段部分硝化-氨氧化过程的原位回收中的作用：特征和机理。
硝酸盐累积是一阶段部分硝化厌氧氨氧化（PN / A）工艺中的一个严重操作难题。为了研究一种有效的原位修复方法，在PN / A过程中，通过硝酸盐积累的方法，在PN / A过程中加入了2 mgN / L的羟胺（NH2OH）和肼（N2H4）。NH2OH处理显示出比NH2H4和空白对照更好的TN去除和硝酸盐还原性能。通过添加NH2OH 104天，MRNN（NO3--N生成与NH4 + -N去除的摩尔比）从70％降低到19.91％；TN去除量从0.01增加到0.18 kgN /（m3 d）。停止化学添加后，硝酸盐反弹回用于N2H4处理，但对NH2OH的恢复效果稳定且持久。NH2OH的添加导致还原电位低（-250 mV），并对亚硝酸盐氧化细菌的活性产生强烈的抑制作用。此外，氨氧化细菌活性，功能基因（hao）和亚硝化单胞菌的快速增强导致加入NH 2 OH可恢复PN / A。
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