Abstract
The use of nitrification inhibition as a concentrating step for ammonium (NH4+), for the purpose of increasing the potential for simultaneous recovery of phosphate (PO43−) and NH4+ 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 PO43−, NH4+, and nitrate (NO3−) 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 NH4+ (NH4+rem.) was converted to NO3− in the CR, indicating almost complete nitrification occurred in the reactor. However, only 47% of the NH4+rem. was converted to NO3− 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 NH4+ concentrations to increase by suppressing the formation of NO3− 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 NH4+ concentration and increasing consecutive recovery of PO43− together with NH4+ from the effluent discharges.
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This study was supported by the Scientific Research Project Commission of Süleyman Demirel University, Isparta, Turkey (project number: FYL-2018–6718). The financial assistance of the study is thankfully acknowledged by the authors.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by M.Sc. İrem USLU and Dr. Hüseyin YAZICI. The first draft of the manuscript was written by Dr. Hüseyin YAZICI, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Uslu, İ., Yazıcı, H. Investigation of the effect of nitrification inhibition on the performance and effluent quality of aerobic sequential batch reactors. Environ Monit Assess 194, 592 (2022). https://doi.org/10.1007/s10661-022-10256-9
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DOI: https://doi.org/10.1007/s10661-022-10256-9