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NITRIFYING VERSUS NON-NITRIFYING OPERATION AT THE EL TORO WATER DISTRICT ACTIVATED SLUDGE PLANT
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Description: Book cover
NITRIFYING VERSUS NON-NITRIFYING OPERATION AT THE EL TORO WATER DISTRICT ACTIVATED SLUDGE PLANT

NITRIFYING VERSUS NON-NITRIFYING OPERATION AT THE EL TORO WATER DISTRICT ACTIVATED SLUDGE PLANT

NITRIFYING VERSUS NON-NITRIFYING OPERATION AT THE EL TORO WATER DISTRICT ACTIVATED SLUDGE PLANT

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Description: Book cover
NITRIFYING VERSUS NON-NITRIFYING OPERATION AT THE EL TORO WATER DISTRICT ACTIVATED SLUDGE PLANT
Abstract
The upgraded El Toro Water District Water Recycling Plant (ETWRP), located in Orange County, California, started operation in June 1997 at 4.6 mgd. The plant includes odorcontrolled influent wastewater equalization basins and aeration basins partitioned for aerobic selector operation. The plant was initially operated under non-nitrifying conditions, at a low Solids Retention Time (SRT) averaging 1.2 days. Thereafter, operation was changed to nitrifying mode at an average SRT of 3.8 days.A comparison of operating conditions after changing from non-nitrifying to nitrifying mode shows improved effluent BOD/TSS quality, increased air demand (from 580 to 830 standard cubic feet of air per lb BOD) and decreased waste sludge production (from 1.22 to 0.81 lb/lb BOD).Since the El Toro Water District transports its waste sludge to a regional facility and incurs costs for further stabilization and disposal, the cost saving in reduced sludge production in this case outweighs the additional power costs due to increased air consumption.
The upgraded El Toro Water District Water Recycling Plant (ETWRP), located in Orange County, California, started operation in June 1997 at 4.6 mgd. The plant includes odorcontrolled influent wastewater equalization basins and aeration basins partitioned for aerobic selector operation. The plant was initially operated under non-nitrifying conditions, at a low Solids Retention Time (SRT) averaging...
Author(s)
Robert R. HillDennis P. CaffertyWesley A. MautzLou R. SiroisRobert A. GilletteMary C. LeeHeinrich O. Buhr
SourceProceedings of the Water Environment Federation
SubjectSession 34 - Facility Operations I: Plant Operations and Maintenance - Building on Experience
Document typeConference Paper
PublisherWater Environment Federation
Print publication date Jan, 2000
ISSN1938-6478
SICI1938-6478(20000101)2000:11L.286;1-
DOI10.2175/193864700784544325
Volume / Issue2000 / 11
Content sourceWEFTEC
First / last page(s)286 - 297
Copyright2000
Word count167

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Description: Book cover
NITRIFYING VERSUS NON-NITRIFYING OPERATION AT THE EL TORO WATER DISTRICT ACTIVATED SLUDGE PLANT
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Description: Book cover
NITRIFYING VERSUS NON-NITRIFYING OPERATION AT THE EL TORO WATER DISTRICT ACTIVATED SLUDGE PLANT
Abstract
The upgraded El Toro Water District Water Recycling Plant (ETWRP), located in Orange County, California, started operation in June 1997 at 4.6 mgd. The plant includes odorcontrolled influent wastewater equalization basins and aeration basins partitioned for aerobic selector operation. The plant was initially operated under non-nitrifying conditions, at a low Solids Retention Time (SRT) averaging 1.2 days. Thereafter, operation was changed to nitrifying mode at an average SRT of 3.8 days.A comparison of operating conditions after changing from non-nitrifying to nitrifying mode shows improved effluent BOD/TSS quality, increased air demand (from 580 to 830 standard cubic feet of air per lb BOD) and decreased waste sludge production (from 1.22 to 0.81 lb/lb BOD).Since the El Toro Water District transports its waste sludge to a regional facility and incurs costs for further stabilization and disposal, the cost saving in reduced sludge production in this case outweighs the additional power costs due to increased air consumption.
The upgraded El Toro Water District Water Recycling Plant (ETWRP), located in Orange County, California, started operation in June 1997 at 4.6 mgd. The plant includes odorcontrolled influent wastewater equalization basins and aeration basins partitioned for aerobic selector operation. The plant was initially operated under non-nitrifying conditions, at a low Solids Retention Time (SRT) averaging...
Author(s)
Robert R. HillDennis P. CaffertyWesley A. MautzLou R. SiroisRobert A. GilletteMary C. LeeHeinrich O. Buhr
SourceProceedings of the Water Environment Federation
SubjectSession 34 - Facility Operations I: Plant Operations and Maintenance - Building on Experience
Document typeConference Paper
PublisherWater Environment Federation
Print publication date Jan, 2000
ISSN1938-6478
SICI1938-6478(20000101)2000:11L.286;1-
DOI10.2175/193864700784544325
Volume / Issue2000 / 11
Content sourceWEFTEC
First / last page(s)286 - 297
Copyright2000
Word count167

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Robert R. Hill# Dennis P. Cafferty# Wesley A. Mautz# Lou R. Sirois# Robert A. Gillette# Mary C. Lee# Heinrich O. Buhr. NITRIFYING VERSUS NON-NITRIFYING OPERATION AT THE EL TORO WATER DISTRICT ACTIVATED SLUDGE PLANT. Alexandria, VA 22314-1994, USA: Water Environment Federation, 2018. Web. 9 Jul. 2025. <https://www.accesswater.org?id=-286932CITANCHOR>.
Robert R. Hill# Dennis P. Cafferty# Wesley A. Mautz# Lou R. Sirois# Robert A. Gillette# Mary C. Lee# Heinrich O. Buhr. NITRIFYING VERSUS NON-NITRIFYING OPERATION AT THE EL TORO WATER DISTRICT ACTIVATED SLUDGE PLANT. Alexandria, VA 22314-1994, USA: Water Environment Federation, 2018. Accessed July 9, 2025. https://www.accesswater.org/?id=-286932CITANCHOR.
Robert R. Hill# Dennis P. Cafferty# Wesley A. Mautz# Lou R. Sirois# Robert A. Gillette# Mary C. Lee# Heinrich O. Buhr
NITRIFYING VERSUS NON-NITRIFYING OPERATION AT THE EL TORO WATER DISTRICT ACTIVATED SLUDGE PLANT
Access Water
Water Environment Federation
December 22, 2018
July 9, 2025
https://www.accesswater.org/?id=-286932CITANCHOR