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Effect of Fe(II) on simultaneous marine anammox and Feammox treating nitrogen-laden saline wastewater under low temperature: Enhanced performance and kinetics
Desalination ( IF 9.9 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.desal.2019.114287
Li Feng , Jin Li , Haoran Ma , Guanghao Chen

Abstract A sequencing batch reactor (SBR) was used to study enhanced nitrogen removal of marine anammox bacteria (MAB) treating nitrogen-laden saline wastewater with Fe(II) addition. The reactor was operated at 15 °C with influent pH of 7.5 ± 0.1. At 4 mg/L Fe(II), ammonia removal rate (ARR) and nitrite removal rate (NRR) increased to 0.85 and 0.90 kg/(m3·d), respectively. Specific anammox activity (SAA) sharply increased to 0.76 kg/(kg·d). Both marine anammox and marine Feammox reaction occurred simultaneously. ΔNO2−-N/ΔNH4+-N was lower than theoretical ratio due to marine Feammox. When Fe(II) was >25 mg/L, the maximal substrate conversion rate increased from 2.97 to 3.47 kg/(m3·d) within 1 h. High Fe(II) concentration (> 25 mg/L) had no negative effect on marine anammox but could inhibit marine Feammox process. The optimal Fe(II) dose was 25 mg/L for marine Feammox. The remodified Logistic model was appropriate to analyze nitrogen removal independent of Fe(II) concentration, and the modified Boltzmann model could only be used to analyze nitrogen removal at high Fe(II) concentration. At 10 mg/L Fe(II), the fitted λ value declined from 0.52 h to 0.34 h. The lag time of MAB was shorten greatly.

中文翻译:

Fe(II) 对低温下同时处理海洋厌氧氨氧化和 Feammox 处理含氮咸水废水的影响:增强的性能和动力学

摘要 采用序批式反应器(SBR)研究了海洋厌氧氨氧化细菌(MAB)在处理含Fe(II)含氮盐废水时的脱氮效果。反应器在 15 °C 下运行,进水 pH 值为 7.5 ± 0.1。在 4 mg/L Fe(II) 时,氨去除率 (ARR) 和亚硝酸盐去除率 (NRR) 分别增加到 0.85 和 0.90 kg/(m3·d)。厌氧氨氧化比活性(SAA)急剧增加到 0.76 kg/(kg·d)。海洋厌氧氨氧化反应和海洋厌氧氨氧化反应同时发生。由于海洋 Feammox,ΔNO2--N/ΔNH4+-N 低于理论比率。当 Fe(II) >25 mg/L 时,最大底物转化率在 1 h 内从 2.97 增加到 3.47 kg/(m3·d)。高Fe(II)浓度(> 25 mg/L)对海洋厌氧氨氧化没有负面影响,但会抑制海洋厌氧氨氧化过程。海洋 Feammox 的最佳 Fe(II) 剂量为 25 mg/L。修正后的Logistic模型适用于分析与Fe(II)浓度无关的脱氮情况,修正后的Boltzmann模型只能用于分析高Fe(II)浓度下的脱氮情况。在 10 mg/L Fe(II) 时,拟合的 λ 值从 0.52 小时下降到 0.34 小时。MAB 的滞后时间大大缩短。
更新日期:2020-03-01
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