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首页> 外文期刊>Bioprocess and Biosystems Engineering >Characteristics of nutrients removal under partial denitrification initiated by different initial nitrate concentration
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Characteristics of nutrients removal under partial denitrification initiated by different initial nitrate concentration

机译：不同初始硝酸盐浓度引发的部分脱氮下营养成分的特征

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The partial denitrification (PD) is a very promising process developed in the last decade, to study the comprehensive influence of influent carbon to nitrogen (C/N) on the activated sludge system under PD, six sequencing batch reactors (SBRs) were operated in parallel at C/N of 2.75, 3.30, 4.13, 5.50, 8.25 and 16.50, the nitrogen removal, phosphorus removal and sludge settleability of PD were investigated. The results showed that PD was observed treating synthetic wastewater in all the six SBRs, and the nitrite accumulation rate (NAR) was highest at C/N of 5.50 (NAR of 82.30%). However, due to the alternate inhibition of NO2--N and free nitrous acid (FNA) produced by a limited carbon source, both the sludge settleability and phosphorus removal deteriorated. The average SVI at C/N of 8.25 was 130% lower than C/N of 3.30, and the average amount of PO43--P released at C/N of 16.5 was 189% higher than C/N of 2.75. Kinetic analysis showed that the denitrification kinetics of PD and complete denitrification were similar, and the nitrite accumulation was caused by the difference between nitrate reduction rate and nitrite reduction rate. Variations of on-line parameters (pH and ORP) revealed that nitrite accumulation could be indicated by judging the nitrate turning point and nitrite turning point on pH and ORP curves, which provided guidance for the setup of PD.
机译：部分反硝化（PD）是在过去十年中开发的非常有前景的过程，研究了在PD下的活化污泥系统上对氮气（C / N）的综合影响，六个测序批量反应器（SBR）进行了操作研究了2.75,3.30,4.13,5.50,8.25和16.50的C / N的平行，研究了PD的氮气去除，磷去除和污泥可沉降率。结果表明，在所有六个SBR中观察到Pd处理合成废水，亚硝酸盐累积率（NAR）为5.50的C / N（NAR为82.30％）。然而，由于通过有限碳源制备的NO 2-N和游离亚硝酸（FNA）的交替抑制，污泥沉积性和磷去除劣化。 8.25的C / N的平均SVI为3.30的C / N为3.30的130％，并且在16.5的C / N下释放的PO43-p的平均量为2.75的C / N的189％。动力学分析表明，Pd的脱氮动力学和完全反硝化具有相似，亚硝酸盐积累是由硝酸盐还原率和亚硝酸盐还原率之间的差异引起的。在线参数（pH和ORP）的变化表明，通过判断pH和ORP曲线上的硝酸盐转折点和亚硝酸盐转折点，可以指示亚硝酸盐积聚，这为PD的设置提供了指导。

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