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Effect of free ammonia inhibition on NOB activity in high nitrifying performance of sludge

机译：游离氨抑制对高硝化污泥中NOB活性的影响

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The inhibition of free ammonia (FA) on nitrite-oxidizing bacteria (NOB) was investigated using an enriched NOB community with high nitrifying performance. A continuous-flow reactor was operated for the enrichment of the bacterial community. High-throughput sequencing analysis showed that Nitrospira (NOB) using in batch experiments was extended from 4.78% to 12.08% during the under continuous-flow operation for 27 days. For each batch experiments, an ammonia injection at the start-up resulted in the desired initial FA concentration (at pH = 8.1–8.2, T = 25 °C), and a continuous ammonia feeding stream allowed for a relatively stabilized FA levels as much as the initial one. Results indicated that FA inhibition on NOB was not instantaneous but occurred gradually at a certain reaction time. Low concentrations of FA (18.08–24.95 mg L ~(?1) ) had a limited inhibition on NOB with increasingly high nitrate production rates, whereas high FA levels (36.06–50.66 mg L ~(?1) ) exerted a significant negative impact on the NOB. Also, strong adaptation happened in these high levels of FA inhibition on NOB, which resulted in an overall low NOB activity during the whole aerobic operation.
机译：使用具有高硝化性能的富集NOB群落，研究了游离氨（FA）对亚硝酸盐氧化细菌（NOB）的抑制作用。操作连续流反应器以富集细菌群落。高通量测序分析表明，在连续流操作下进行27天时，批量实验中使用的Nitrospira（NOB）从4.78％扩展到12.08％。对于每批实验，在启动时注入氨都会达到所需的初始FA浓度（在pH = 8.1–8.2，T = 25°C时），并且连续不断的氨进料流可以使FA相对稳定作为最初的。结果表明，FA对NOB的抑制作用不是瞬时的，而是在一定的反应时间逐渐发生的。低浓度的FA（18.08–24.95 mg L〜（？1））对NOB的抑制作用有限，硝酸盐生产率越来越高，而高的FA水平（36.06–50.66 mg L〜（？1））则产生显着的负面影响在NOB上。同样，FA对NOB的高抑制作用发生了强烈的适应性，导致整个有氧操作过程中NOB活性总体较低。

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