Experimental Study on Dynamics of Water Qualities near Bed Material in Anoxic Water Area Focused on Nitrate Nitrogen
Experimental Study on Dynamics of Water Qualities near Bed Material in Anoxic Water Area Focused on Nitrate Nitrogen
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以硝态氮为主的缺氧水域近床质水质动态实验研究
DOI：
10.7132/jrcsa.22_2_31
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
T. Tabata
中科院分区：
文献类型：
--
作者：
Ayaka Oniki;M. Harada;Kazuaki Hiramatsu;T. Tabata
摘要：定量阐明反硝化细菌、铁还原细菌和硫酸盐还原细菌等厌氧微生物对水质生化动态的影响，对理解有机污染导致水环境恶化的机理具有重要意义。因此，我们进行了烧杯规模的实验室实验，以获得缺氧条件下床质附近水质动力学的基本知识，如ORP、营养盐、硫化物等。假设最初由厌氧呼吸引起的反硝化作用影响了随后分阶段发生的还原半反应，本研究的目的是：基于厌氧条件下随着磷酸盐（PO4-P）、铵态氮（NH4-N）和硫化物的增加而达到缺氧状态时硝酸盐（NO3-N）浓度的影响，定量评估其水质动态与ORP随时间变化的关系。结果表明，ORP在厌氧条件下的动态特性可分为五个步骤，说明ORP在每个步骤中的下降速率受初始NO3-N含量的影响，初始NO3-N浓度越高，ORP达到最小电势平衡所需的时间越长。此外，PO4-P、NH4-N、硫化物和DOC的增加特征可以解释为ORP步骤之间的过渡，并且它们的水质动态可以用线性或非线性回归建模。因此，在考虑初始NO3-N水平对这些水质项目的影响的同时，通过ORP监测可以方便地估计PO4-P、NH4-N、硫化物和DOC的动态。
Abstract: Quantitatively clarifying bio-chemical water quality dynamics as affected by anaerobic microorganisms such as denitrifying bacteria, iron-reducing bacteria and sulfate-reducing bacteria plays an important role in understanding the mechanism of water environment deterioration that accompanies organic pollution. Accordingly, beaker-scale laboratory experiments were conducted in order to obtain basic knowledge concerning water quality dynamics such as ORP, nutrient salts, sulfides, and so on, near bed material under anoxic conditions. Assuming that denitrification initially caused by anaerobic respiration impacts the reduction half-reactions that later occur in phases, the purpose of this research was as follows: based on the impact of the concentration of nitrate (NO3-N) at the point when an anoxic state was reached with the increase of phosphate (PO4-P), ammonium (NH4-N), and sulfides under anaerobic conditions, their water quality dynamics were quantitatively assessed in relation to change over time of ORP. As a result, the dynamic properties of ORP under anaerobic conditions could be characterized in five steps, suggesting that the rate of decrease of ORP at each step is influenced by the initial NO3-N content, and the higher the initial NO3-N concentration, the longer ORP took to reach equilibrium of the minimized electric potential. Also, the characteristics of increases in PO4-P, NH4-N, sulfides, and DOC can be explained in relation to the transition between ORP steps, and that their water quality dynamics were modeled with either linear or non-linear regressions. Thus, it was concluded that we were able to estimate the dynamics of PO4-P, NH4-N, sulfide and DOC conveniently through monitoring of ORP while considering the influenced of initial NO3-N levels on theses water quality items.
缺氧水条件下水库最深处硫化氢的生成
影响因子：
2.2
作者：
Do Thuy Nguyen;Yuichiro Yoshimura;Masayoshi Harada and Kazuaki Hiramatsu
通讯作者：
Masayoshi Harada and Kazuaki Hiramatsu
使用考虑多种藻类的单箱生态系统模型评估富营养化农业池塘的水质动态
DOI：
--
发表时间：
2010
期刊：
Paddy and Water Environment 8(4)
影响因子：
--
作者：
Do Thuy Nguyen;Masayoshi Harada;Kazuaki Hiramatsu
通讯作者：
Kazuaki Hiramatsu