0710b37584c084e532de86d6e6896b8a processes_a2020v8n12p1606.pdf 141d3cabb6ee56ed2605ff1b1ad43477d1a15c7b processes_a2020v8n12p1606.pdf f48147971c16023f3d1c5f45f1cefbf11fb23eb1da8107267cbf4046a61d0c6e processes_a2020v8n12p1606.pdf Title: Global Internal Recirculation Alternative Operation to Reduce Nitrogen and Ammonia Limit Violations and Pumping Energy Costs in Wastewater Treatment Plants Subject: The internal recirculation plays an important role in different areas of the biological treatment of wastewater treatment plants because it has a great influence on the concentration of pollutants, especially nutrients. A usual manipulation of the internal recirculation flow rate is based on the target of controlling the nitrate concentration in the last anoxic tank. This work proposes an alternative for the manipulation of the internal recirculation flow rate instead of nitrate control, with the objective of avoiding limit violations of nitrogen and ammonia concentrations and reducing operational costs. A fuzzy controller is proposed to achieve it based on the effects of the internal recirculation flow rate in different areas of the biological treatment. The proposed manipulation of the internal recirculation flow rate is compared to the application of the usual nitrate control in an already established and published operation strategy by using the internationally known benchmark simulation model no. 2 as a working scenario. The results show improvements with reductions of 59.40% in ammonia limit violations, 2.35% in total nitrogen limit violations, and 38% in pumping energy costs. Keywords: wastewater treatment plant; fuzzy control; benchmark simulation model no. 2; control strategies Author: Ignacio Santín, Ramon Vilanova, Carles Pedret and Marian Barbu Creator: LaTeX with hyperref package Producer: pdfTeX-1.40.18 CreationDate: Mon Dec 7 07:04:58 2020 CET ModDate: Mon Dec 7 07:04:58 2020 CET Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 13 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 4231604 bytes Optimized: no PDF version: 1.5 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- VCFDJF+URWPalladioL-Ital Type 1 Custom yes yes no 72 0 ZQANWC+URWPalladioL-Bold Type 1 Custom yes yes no 73 0 VTYLMX+URWPalladioL-Roma Type 1 Custom yes yes no 74 0 BHUVWR+TimesNewRomanPS-BoldItalicMT Type 1C WinAnsi yes yes no 79 0 MCBCCI+SourceSansRoman-Regular Type 1C Custom yes yes no 96 0 MCBCCM+SourceSansRoman.613wght Type 1C Custom yes yes 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