{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,25]],"date-time":"2025-10-25T14:07:37Z","timestamp":1761401257769},"reference-count":25,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2005,3,1]],"date-time":"2005-03-01T00:00:00Z","timestamp":1109635200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Haruo Miyake provided by the Japan Sewage Works Agency, Tokyo"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Water Environment Research"],"published-print":{"date-parts":[[2005,3]]},"abstract":"<jats:p>Enhanced biological phosphorus removal is a well\u2010established technology for the treatment of municipal wastewater. However, increased effluent phosphorus concentrations have been reported after periods (days) of low organic loading. The purpose of this study was to evaluate different operating strategies to prevent discharge of effluent after such low\u2010loading periods. Mechanisms leading to these operational problems have been related to the reduction of polyphosphate\u2010accumulating organisms (PAOs) and their storage compounds (polyhydroxy alkanoates [PHA]). Increased effluent phosphorus concentrations can be the result of an imbalance between influent loading and PAOs in the system and an imbalance between phosphorus release and uptake rates. The following operating conditions were tested in their ability to prevent a reduction of PHA and of overall biomass during low organic loading conditions: (a) unchanged operation, (b) reduced aeration time, (c) reduced sludge wastage, and (d) combination of reduced aeration time and reduced sludge wastage. Experiments were performed in a laboratory\u2010scale anaerobic\u2013aerobic sequencing batch reactor, using acetate as the carbon source. Without operational adjustments, phosphorus\u2010release rates decreased during low\u2010loading periods but recovered rapidly. Phosphorus\u2010uptake rates also decreased, and the recovery typically required several days to increase to normal levels. The combination of reduced aeration time and reduced sludge wastage allowed the maintenance of constant levels of both PHA and overall biomass. A mathematical model was used to explain the influence of the tested operating conditions on PAO and PHA concentrations. While experimental results were in general agreement with model predictions, the kinetic expression for phosphorus uptake deviated significantly for the first 24 hours after low\u2010loading conditions. Mechanisms leading to these deviations need to be further investigated.<\/jats:p>","DOI":"10.2175\/106143005x41681","type":"journal-article","created":{"date-parts":[[2005,10,17]],"date-time":"2005-10-17T09:58:55Z","timestamp":1129543135000},"page":"117-127","source":"Crossref","is-referenced-by-count":12,"title":["Optimization of Enhanced Biological Phosphorus Removal after Periods of Low Loading"],"prefix":"10.1002","volume":"77","author":[{"given":"Haruo","family":"Miyake","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eberhard","family":"Morgenroth","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,3]]},"reference":[{"key":"e_1_2_6_2_1","volume-title":"Standard Methods for the Examination of Water and Wastewater","author":"American Public Health Association; American Water Works Association; Water Environment Federation","year":"1998"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.2166\/wst.2002.0502"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0043-1354(97)00183-8"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0273-1223(99)00120-1"},{"issue":"1","key":"e_1_2_6_6_1","doi-asserted-by":"crossref","first-page":"75","DOI":"10.2166\/wst.1999.0017","article-title":"Microbial Competition for the Organic Substrates and its Impact on EBPR Systems Under Conditions of Changing Carbon Feed.","volume":"39","author":"Carucci A.","year":"1999","journal-title":"Water Sci. 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