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Inhibition kinetics of ammonium oxidizing bacteria under Cu(II) and As(III) stresses during the nitritation process
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2018-07-10 , DOI: 10.1016/j.cej.2018.07.069
Chong-Jian Tang , Cheng-Shan Duan , Peng Liu , Xilin Chai , Xiaobo Min , Shuo Wang , Ruiyang Xiao , Zongsu Wei

Nitritation processes with ammonium oxidizing bacteria (AOB) frequently suffer inhibition from heavy metals in municipal wastewater treatment. In the present study, two frequently detected heavy metals, Cu(II) and As(III), were selected to assess their inhibition effect during the nitritation process. Specific ammonium conversion rate (SACR), specific oxygen uptake rate (SOUR), and specific nitrite production rate (SNPR) in batch tests were first applied to evaluate nitritation kinetics, and simulated by the classic Haldane substrate inhibition kinetic model. The presence of Cu(II) stress imposed a more pronounced inhibition on nitritation process than As(III) with half inhibition concentrations of 6.7 and 86.6 mg L−1, respectively. The kinetic result showed that Cu(II) acts as an uncompetitive inhibitor on nitritation process with reduced affinity (KS) and specific activity (Vmax) values. The difference in the inhibition kinetics between Cu(II) and As(III) can be accounted by the oxidation of As(III) to As(V) and subsequent competition by dissolved oxygen under nitritation condition. Our result indicated that the SNPR method exhibits great performance in describing and modelling the inhibition kinetics of heavy metals on nitritation process.



中文翻译:

硝化过程中Cu(II)和As(III)胁迫下铵氧化细菌的抑制动力学

铵氧化细菌(AOB)的亚硝化过程在市政废水处理中经常受到重金属的抑制。在本研究中,选择了两种经常检测到的重金属Cu(II)和As(III)来评估其在硝化过程中的抑制作用。首先将批处理中的特定铵转化率(SACR),特定氧吸收率(SOUR)和特定亚硝酸盐生成率(SNPR)用于评估硝化动力学,并通过经典的Haldane底物抑制动力学模型进行模拟。Cu(II)应力的存在对亚硝化过程的抑制作用比As(III)更为明显,抑制浓度分别为6.7和86.6 mg L -1, 分别。动力学结果表明,Cu(II)在硝化过程中作为非竞争性抑制剂,具有降低的亲和力(K S)和比活度(V max)值。Cu(II)和As(III)之间的抑制动力学差异可以通过将As(III)氧化为As(V)以及随后在硝化条件下溶解氧的竞争来解决。我们的结果表明,SNPR方法在描述和建模重金属对硝化过程的抑制动力学方面表现出出色的性能。

更新日期:2018-07-10
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