000199972 001__ 199972
000199972 005__ 20181203023534.0
000199972 0247_ $$2doi$$a10.1016/j.watres.2014.04.011
000199972 022__ $$a0043-1354
000199972 02470 $$2ISI$$a000337861400006
000199972 037__ $$aARTICLE
000199972 245__ $$aOptimization of operation conditions for the startup of aerobic granular sludge reactors biologically removing carbon, nitrogen, and phosphorous
000199972 260__ $$bElsevier$$c2014$$aOxford
000199972 269__ $$a2014
000199972 300__ $$a13
000199972 336__ $$aJournal Articles
000199972 520__ $$aThe transformation of conventional flocculent sludge to aerobic granular sludge (AGS) biologically removing carbon, nitrogen and phosphorus (COD, N, P) is still a main challenge in startup of AGS sequencing batch reactors (AGS-SBRs). On the one hand a rapid granulation is desired, on the other hand good biological nutrient removal capacities have to be maintained. So far, several operation parameters have been studied separately, which makes it difficult to compare their impacts. We investigated seven operation parameters in parallel by applying a Plackett-Burman experimental design approach with the aim to propose an optimized startup strategy. Five out of the seven tested parameters had a significant impact on the startup duration. The conditions identified to allow a rapid startup of AGS-SBRs with good nutrient removal performances were (i) alternation of high and low dissolved oxygen phases during aeration, (ii) a settling strategy avoiding too high biomass washout during the first weeks of reactor operation, (iii) adaptation of the contaminant load in the early stage of the startup in order to ensure that all soluble COD was consumed before the beginning of the aeration phase, (iv) a temperature of 20 °C, and (v) a neutral pH. Under such conditions, it took less than 30 days to produce granular sludge with high removal performances for COD, N, and P. A control run using this optimized startup strategy produced again AGS with good nutrient removal performances within four weeks and the system was stable during the additional operation period of more than 50 days.
000199972 6531_ $$aAerobic granular biofilms
000199972 6531_ $$aGranulation
000199972 6531_ $$aNutrient removal
000199972 6531_ $$aOperation conditions
000199972 6531_ $$aReactor startup
000199972 700__ $$0243056$$g158993$$aLochmatter, Samuel
000199972 700__ $$aHolliger, Christof$$g121849$$0240405
000199972 773__ $$j59$$tWater Research$$q58-70
000199972 909C0 $$xU10268$$0252125$$pLBE
000199972 909CO $$particle$$pENAC$$ooai:infoscience.tind.io:199972
000199972 917Z8 $$x106673
000199972 937__ $$aEPFL-ARTICLE-199972
000199972 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000199972 980__ $$aARTICLE