Inducing granulation within a full-scale activated sludge system to improve settling

Most cold-climate biological nutrient removal facilities experience poor settling mixed liquor during winter, resulting in treatment capacity throughput limitations. The Metro Wastewater Reclamation District in Denver, Colorado, operated two full-scale secondary treatment trains to compare the exist...

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Autores principales:	Isaac Avila, Dan Freedman, Joel Johnston, Blair Wisdom, James McQuarrie
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	aerobic granular sludge continuous flow reactor full-scale granules hydrocyclone settleability Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/c02e2b450bfb4ccfab17cc8dcf998b5d
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spelling	oai:doaj.org-article:c02e2b450bfb4ccfab17cc8dcf998b5d2021-11-06T11:13:37ZInducing granulation within a full-scale activated sludge system to improve settling0273-12231996-973210.2166/wst.2021.006https://doaj.org/article/c02e2b450bfb4ccfab17cc8dcf998b5d2021-07-01T00:00:00Zhttp://wst.iwaponline.com/content/84/2/302https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Most cold-climate biological nutrient removal facilities experience poor settling mixed liquor during winter, resulting in treatment capacity throughput limitations. The Metro Wastewater Reclamation District in Denver, Colorado, operated two full-scale secondary treatment trains to compare the existing biological nutrient removal configuration (Control) to one that was modified to operate with an anaerobic selector and with hydrocyclone selective wasting (Test) to induce granulation. Results from this evaluation showed that the Test achieved significantly better settling behaviour than the Control. The difference in the mean diluted SVI30 between the Test and Control were statistically significant (P < 0.05), with values of 77 ± 17 and 135 ± 25 mL/g observed for the Test and Control respectively. These settling results were accompanied by differences in the particle size distribution, with notably higher settling velocities commensurate with increasing particle size. The degree of granulation observed in the Test train was between 32 and 56% of the mass greater than ≥250 μm in particle size whereas 16% of the mixed liquor in the Control was ≥250 μm over the entire study period. The improved settling behaviour of the Test configuration may translate into an increase of secondary treatment capacity during winter by 32%. HIGHLIGHTS Inducing granulation in a full-scale continuous flow activated sludge system was possible with the application of both biological and physical selection pressures.; Observations in this study could translate to a cost effective intensification solution versus traditional expansion for WRRFs evaluating capacity needs.;Isaac AvilaDan FreedmanJoel JohnstonBlair WisdomJames McQuarrieIWA Publishingarticleaerobic granular sludgecontinuous flow reactorfull-scalegranuleshydrocyclonesettleabilityEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 2, Pp 302-313 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	aerobic granular sludge continuous flow reactor full-scale granules hydrocyclone settleability Environmental technology. Sanitary engineering TD1-1066
spellingShingle	aerobic granular sludge continuous flow reactor full-scale granules hydrocyclone settleability Environmental technology. Sanitary engineering TD1-1066 Isaac Avila Dan Freedman Joel Johnston Blair Wisdom James McQuarrie Inducing granulation within a full-scale activated sludge system to improve settling
description	Most cold-climate biological nutrient removal facilities experience poor settling mixed liquor during winter, resulting in treatment capacity throughput limitations. The Metro Wastewater Reclamation District in Denver, Colorado, operated two full-scale secondary treatment trains to compare the existing biological nutrient removal configuration (Control) to one that was modified to operate with an anaerobic selector and with hydrocyclone selective wasting (Test) to induce granulation. Results from this evaluation showed that the Test achieved significantly better settling behaviour than the Control. The difference in the mean diluted SVI30 between the Test and Control were statistically significant (P < 0.05), with values of 77 ± 17 and 135 ± 25 mL/g observed for the Test and Control respectively. These settling results were accompanied by differences in the particle size distribution, with notably higher settling velocities commensurate with increasing particle size. The degree of granulation observed in the Test train was between 32 and 56% of the mass greater than ≥250 μm in particle size whereas 16% of the mixed liquor in the Control was ≥250 μm over the entire study period. The improved settling behaviour of the Test configuration may translate into an increase of secondary treatment capacity during winter by 32%. HIGHLIGHTS Inducing granulation in a full-scale continuous flow activated sludge system was possible with the application of both biological and physical selection pressures.; Observations in this study could translate to a cost effective intensification solution versus traditional expansion for WRRFs evaluating capacity needs.;
format	article
author	Isaac Avila Dan Freedman Joel Johnston Blair Wisdom James McQuarrie
author_facet	Isaac Avila Dan Freedman Joel Johnston Blair Wisdom James McQuarrie
author_sort	Isaac Avila
title	Inducing granulation within a full-scale activated sludge system to improve settling
title_short	Inducing granulation within a full-scale activated sludge system to improve settling
title_full	Inducing granulation within a full-scale activated sludge system to improve settling
title_fullStr	Inducing granulation within a full-scale activated sludge system to improve settling
title_full_unstemmed	Inducing granulation within a full-scale activated sludge system to improve settling
title_sort	inducing granulation within a full-scale activated sludge system to improve settling
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/c02e2b450bfb4ccfab17cc8dcf998b5d
work_keys_str_mv	AT isaacavila inducinggranulationwithinafullscaleactivatedsludgesystemtoimprovesettling AT danfreedman inducinggranulationwithinafullscaleactivatedsludgesystemtoimprovesettling AT joeljohnston inducinggranulationwithinafullscaleactivatedsludgesystemtoimprovesettling AT blairwisdom inducinggranulationwithinafullscaleactivatedsludgesystemtoimprovesettling AT jamesmcquarrie inducinggranulationwithinafullscaleactivatedsludgesystemtoimprovesettling
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Inducing granulation within a full-scale activated sludge system to improve settling

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