{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,31]],"date-time":"2025-12-31T14:51:01Z","timestamp":1767192661210,"version":"build-2065373602"},"reference-count":36,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2012,11,26]],"date-time":"2012-11-26T00:00:00Z","timestamp":1353888000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In Korea, more than 80% of municipal wastewater treatment plants (WWTPs) with capacities of 500 m3\u00b7d\u22121 or more are capable of removing nitrogen from wastewater through biological nitrification and denitrification processes. Normally, these biological processes show excellent performance, but if a toxic chemical is present in the influent to a WWTP, the biological processes (especially, the nitrification process) may be affected and fail to function normally; nitrifying bacteria are known very vulnerable to toxic substances. Then, the toxic compound as well as the nitrogen in wastewater may be discharged into a receiving water body without any proper treatment. Moreover, it may take significant time for the process to return back its normal state. In this study, a DO- and pH-based strategy to identify potential nitrification inhibition was developed to detect early the inflow of toxic compounds to a biological nitrogen removal process. This strategy utilizes significant changes observed in the oxygen uptake rate and the pH profiles of the mixed liquor when the activity of nitrifying bacteria is inhibited. Using the strategy, the toxicity from test wastewater with 2.5 mg\u00b7L\u22121 Hg2+, 0.5 mg\u00b7L\u22121 allythiourea, or 0.25 mg\u00b7L\u22121 chloroform could be successfully detected.<\/jats:p>","DOI":"10.3390\/s121216334","type":"journal-article","created":{"date-parts":[[2012,11,26]],"date-time":"2012-11-26T11:24:24Z","timestamp":1353929064000},"page":"16334-16352","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["A DO- and pH-Based Early Warning System of Nitrification Inhibition for Biological Nitrogen Removal Processes"],"prefix":"10.3390","volume":"12","author":[{"given":"Seil","family":"Hong","sequence":"first","affiliation":[{"name":"Department of Environmental Engineering, University of Seoul, 90 Jeonnong-dong Dongdaemun-Gu, Seoul 130-743, Korea"}]},{"given":"Il","family":"Choi","sequence":"additional","affiliation":[{"name":"Department of Environmental Engineering, University of Seoul, 90 Jeonnong-dong Dongdaemun-Gu, Seoul 130-743, Korea"}]},{"given":"Byung","family":"Lim","sequence":"additional","affiliation":[{"name":"National Institute of Environmental Science, Incheon 404-708, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1256-480X","authenticated-orcid":false,"given":"Hyunook","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Environmental Engineering, University of Seoul, 90 Jeonnong-dong Dongdaemun-Gu, Seoul 130-743, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2012,11,26]]},"reference":[{"key":"ref_1","unstructured":"(2012). 2010 National Statistics for Sewage Treatment, Ministry of Environment."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"332","DOI":"10.1016\/j.jhazmat.2006.06.038","article-title":"Critical appraisal of respirometric methods for metal inhibition on activated sludge","volume":"1369","author":"Cokgor","year":"2007","journal-title":"J. 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