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Simultaneous removal of thiocyanate and nitrogen from wastewater by autotrophic denitritation process
Bioresource Technology ( IF 11.4 ) Pub Date : 2018-07-06 , DOI: 10.1016/j.biortech.2018.07.014
Jianxin Pan , Jingde Ma , Haizhen Wu , Yuan Ren , Bingbing Fu , Meiling He , Shuang Zhu , Chaohai Wei

Pollutants containing sulfur as electron donors will play an important role in the energy-saving denitritation process when organic carbon source was insufficient in wastewater. However, thiocyanate (SCN), a hazardous pollutant, has not been characterized in denitritation. In this study, the effects of key environmental factors on removal of thiocyanate and nitrogen were investigated in denitritation. The results showed that the maximum removal efficiency of nitrogen was observed in complete removal of thiocyanate and nitrite. The elemental sulfur was observed prior to complete depletion of thiocyanate. The efficiency of denitritation was promoted by NaHCO3 and weakly-alkaline environment. In the sludge containing dominant Thiobacillus genus, nitrite was reduced in the conversion of thiocyanate into elemental sulfur and further into sulfate. The stoichiometric ratio of NO2-N to SCN-N was close to 2.0 when thiocyanate was converted completely into sulfate, which verified complete removal of thiocyanate and nitrite at the NO2-N/SCN-N ratio of 2.0.



中文翻译:

自养反硝化法同时去除废水中的硫氰酸盐和氮。

当废水中的有机碳源不足时,含有硫作为电子给体的污染物将在节能反硝化过程中发挥重要作用。然而,硫氰酸盐(SCN - ),有害污染物,没有得到其特征denitritation。在这项研究中,在反硝化过程中研究了关键环境因素对硫氰酸盐和氮去除的影响。结果表明,在硫氰酸盐和亚硝酸盐的完全去除中观察到最大的氮去除效率。在完全耗尽硫氰酸盐之前观察到元素硫。NaHCO 3和弱碱性环境提高了反硝化效率。在含有优势硫杆菌的污泥中通常,亚硝酸盐在硫氰酸盐转化为元素硫并进一步转化为硫酸盐时被还原。当硫氰酸盐完全转化为硫酸盐时,NO 2 -- N与SCN -- N的化学计量比接近2.0,这证实了在NO 2 -- N / SCN -- N比率为2.0时硫氰酸盐和亚硝酸盐已完全去除。

更新日期:2018-07-06
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