Department of Environmental Engineering, Faculty of Engineering, Süleyman Demirel University, 32260, Isparta, Turkey.
Department of Environmental Protection Technologies, Vocational School of Aksu Mehmet Süreyya Demiraslan, Isparta University of Applied Sciences, 32510, Isparta, Turkey.
Environ Monit Assess. 2022 Jul 19;194(8):592. doi: 10.1007/s10661-022-10256-9.
The use of nitrification inhibition as a concentrating step for ammonium (NH), for the purpose of increasing the potential for simultaneous recovery of phosphate (PO) and NH from effluent streams of an aerobic sequencing batch reactor (SBR) system, has never been investigated in the literature. Therefore, the present study aimed to determine the effect of the inhibition of nitrification on both the reactor performance and effluent quality in a laboratory scale aerobic SBR system. In order to compare the observed results, a separate reactor, where the inhibition was not applied, was operated as a control reactor (CR) under the identical operational conditions used for the inhibitory reactor (IR). Experimental results for the reactor performance showed that effluents with low total suspended solids (< 50 mg/L) and chemical oxygen demand concentrations (> 90% of removal efficiency based on the influent concentration of 500 mg/L) were achieved for both SBRs by obtaining an activated sludge with a sludge volume index < 60 mL/g after the acclimation period. In the same period, the effluent PO, NH, and nitrate (NO) concentrations were found to be 17.0 ± 4.0, 1.26 ± 0.84, and 21.5 ± 39 mg/L for the CR and 10.0 ± 4.4, 3.9 ± 2.4, and 9.2 ± 1.5 mg/L for the IR, respectively. During this period, 94% of the removed NH (NH) was converted to NO in the CR, indicating almost complete nitrification occurred in the reactor. However, only 47% of the NH was converted to NO in the IR as a result of the inhibition of nitrification, meaning a partial inhibition (53%) occurred due to the inhibition treatment. These results clearly demonstrated that the inhibition of nitrification allowed the effluent NH concentrations to increase by suppressing the formation of NO ions. Based on the results, it can be concluded that inhibition of nitrification in an aerobic SBR system creates a potential for conserving the effluent NH concentration and increasing consecutive recovery of PO together with NH from the effluent discharges.
硝化抑制作用作为氨氮（NH）的浓缩步骤，用于提高从好氧序批式反应器（SBR）系统的流出物中同时回收磷酸盐（PO）和 NH 的潜力，在文献中从未被研究过。因此，本研究旨在确定硝化抑制作用对实验室规模好氧 SBR 系统中反应器性能和出水质量的影响。为了比较观察到的结果，在相同的操作条件下，一个单独的反应器（IR）作为抑制性反应器（IR）运行，作为对照反应器（CR），其中未应用抑制作用。反应器性能的实验结果表明，通过在适应期后获得污泥体积指数（SVI）<60mL/g 的活性污泥，两个 SBR 都可以实现具有低总悬浮固体（<50mg/L）和化学需氧量浓度（基于 500mg/L 进水浓度的>90%去除效率）的出水。在同一时期，发现 CR 的出水 PO、NH 和硝酸盐（NO）浓度分别为 17.0±4.0、1.26±0.84 和 21.5±39mg/L，IR 分别为 10.0±4.4、3.9±2.4 和 9.2±1.5mg/L。在此期间，在 CR 中，去除的 NH（NH）的 94%转化为 NO，表明反应器中几乎完全发生了硝化作用。然而，由于硝化抑制作用，IR 中只有 47%的 NH 转化为 NO，这意味着由于抑制处理，发生了部分抑制（53%）。这些结果清楚地表明，硝化抑制作用通过抑制 NO 离子的形成允许出水 NH 浓度增加。基于这些结果，可以得出结论，在好氧 SBR 系统中抑制硝化作用创造了一种潜力，可以在保持出水 NH 浓度的同时，从出水排放物中连续回收 PO 和 NH。
