The effect of anaerobic selectors on nocardioform organism growth in activated sludge

Fainsod, A; Pagilla, KR; Jenkins, D; Pitt, PA; Mamais, D

dc.contributor.author	Fainsod, A	en
dc.contributor.author	Pagilla, KR	en
dc.contributor.author	Jenkins, D	en
dc.contributor.author	Pitt, PA	en
dc.contributor.author	Mamais, D	en
dc.date.accessioned	2014-03-01T01:48:47Z
dc.date.available	2014-03-01T01:48:47Z
dc.date.issued	1999	en
dc.identifier.issn	10614303	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25596
dc.subject	Anaerobic selector	en
dc.subject	Enhanced biological phosphorus removal	en
dc.subject	Foaming	en
dc.subject	Nocardioform organisms	en
dc.subject.other	Biological sewage treatment	en
dc.subject.other	Microorganisms	en
dc.subject.other	Phosphorus	en
dc.subject.other	Anaerobic selectors	en
dc.subject.other	Enhanced biological phosphorus removal (EBPR)	en
dc.subject.other	Hydraulic retention time (HRT)	en
dc.subject.other	Nocardioform organisms	en
dc.subject.other	Activated sludge process	en
dc.subject.other	phosphate	en
dc.subject.other	Actinobacteria	en
dc.subject.other	activated sludge	en
dc.subject.other	anaerobic capacity	en
dc.subject.other	analytic method	en
dc.subject.other	article	en
dc.subject.other	bacterial count	en
dc.subject.other	microbial growth	en
dc.subject.other	nonhuman	en
dc.subject.other	priority journal	en
dc.subject.other	temperature	en
dc.title	The effect of anaerobic selectors on nocardioform organism growth in activated sludge	en
heal.type	journalArticle	en
heal.identifier.primary	10.2175/106143097X122086	en
heal.identifier.secondary	http://dx.doi.org/10.2175/106143097X122086	en
heal.publicationDate	1999	en
heal.abstract	Laboratory- and full-scale experiments were conducted to investigate the use of anaerobic selectors for control of nocardioform organisms in activated sludge. The laboratory-scale, anaerobic-selector, activated-sludge system, which exhibited enhanced biological phosphorus removal (EBPR) at a 2.4-day total mean cell retention time (MCRT) with a pH of 6.3, a temperature of 20 °C, and an anaerobic selector hydraulic retention time (HRT) of 50 minutes, controlled nocardioforms to below detectable levels whereas nocardioforms were present in a completely mixed control. The full-scale, anaerobic- selector, activated-sludge system performing EBPR at a 3.5-day average MCRT, average temperature of 20 °C, and anaerobic selector HRT of 17 to 24 minutes reduced nocardioform organism levels below those achieved when the full-scale plant was operated at conditions that did not permit EBPR (i.e., MCRT of 1.7 days and anaerobic selector HRT of less than 19 minutes). In the full-scale plant, the lowest nocardioform organism levels and effluent dissolved orthophosphate concentrations were associated with the highest MCRT tested (4.6 days).Laboratory- and full-scale experiments were conducted to investigate the use of anaerobic selectors for control of nocardioform organisms in activated sludge. The laboratory-scale, anaerobic-selector, activated-sludge system, which exhibited enhanced biological phosphorus removal (EBPR) at a 2.4-day total mean cell retention time (MCRT) with a pH of 6.3, a temperature of 20 °C, and an anaerobic selector hydraulic retention time (HRT) of 50 minutes, controlled nocardioforms to below detectable levels whereas nocardioforms were present in a completely mixed control. The full-scale, anaerobic-selector, activated-sludge system performing EBPR at a 3.5-day average MCRT, average temperature of 20 °C, and anaerobic selector HRT of 17 to 24 minutes reduced nocardioform organism levels below those achieved when the full-scale plant was operated at conditions that did not permit EBPR (i.e., MCRT of 1.7 days and anaerobic selector HRT of less than 19 minutes). In the full-scale plant, the lowest nocardioform organism levels and effluent dissolved ortho-phosphate concentrations were associated with the highest MCRT tested (4.6 days).	en
heal.publisher	Water Environment Federation, Alexandria, VA, United States	en
heal.journalName	Water Environment Research	en
dc.identifier.doi	10.2175/106143097X122086	en
dc.identifier.volume	71	en
dc.identifier.issue	6	en
dc.identifier.spage	1151	en
dc.identifier.epage	1157	en