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Nitrous oxide generation in denitrifying phosphorus removal process: main causes and control measures

机译：脱氮除磷过程中产生一氧化二氮的主要原因及控制措施

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摘要

Despite the many benefits of denitrifying phosphorus removal process, the significant generation of nitrous oxide (N_2O), a potent greenhouse gas, remains a problem for this innovative and promising process. To better understand and more effectively control N_2O generation in denitrifying phosphorus removal process, batch experiments were carried out to investigate the main causes of N_2O generation, based on which the control measures were subsequently proposed. The results showed that N_2O generation accounted for 0.41 % of the total nitrogen removal in denitrifying phosphorus removal process, whereas, in contrast, almost no N_2O was generated in conventional denitri-fication process. It was further demonstrated that the weak competition of N_2O reductase for electrons and the high nitrite accumulation were the two main causes for N_2O generation, evidenced by N_2O production and reduction rates under different conditions. Accordingly, the reduction of N_2O generation was successfully achieved via two control measures: (1) the use of continuous nitrate addition reducing N_2O generation by around 91.4 % and (2) the use of propionate as the carbon source reducing N_2O generation by around 69.8 %.
机译：尽管反硝化除磷工艺有很多好处，但对于这种创新且前景广阔的工艺而言，大量产生的一氧化二氮（N_2O）是有效的温室气体，仍然是一个问题。为了更好地理解和更有效地控制反硝化除磷过程中N_2O的产生，进行了分批实验，研究了N_2O产生的主要原因，并在此基础上提出了控制措施。结果表明，在反硝化除磷过程中，N_2O的生成占总氮去除量的0.41％，而相比之下，传统的反硝化过程中几乎不生成N_2O。进一步证明了N_2O还原酶对电子的弱竞争和高亚硝酸盐积累是N_2O生成的两个主要原因，这在不同条件下可以通过N_2O的产生和还原速率来证明。因此，通过两种控制措施成功实现了N_2O的减少：（1）使用连续添加硝酸盐使N_2O的产生减少了约91.4％;（2）使用丙酸酯作为碳源，使N_2O的产生减少了约69.8％。 。

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