Hyperion Treatment Plant Sludge-Out to Full Secondary Project, Los Angeles, CA, USA
Key Data:
Plant capacity
1.6 million m³/day primary flow
Site size
144 acres (60ha)
Associated sewer run
6,000 miles (9,600km)
Primary sedimentation retention time
1-2 hours
Primary sedimentation efficiency
85% SS removal
Oxygen reactor (OR) retention time
1-2 hours
Cryogenic air system supply to OR
96% pure oxygen
Clarifying tank retention period
4 hours
Clarification efficiency
90% to 95% (cumulative)
Water reclamation for re-use
6%
WAS thickening facilities
12 continuous feed, horizontal solid bowl centrifuges; peak hydraulic loading 227m³/h apiece
Energy recovery system generation capacity
25,000kW (electrical)
Total project cost
$1.4 billion
Project Timeline:
Plant begins operation
1950
Plant primary treatment expansion
1957
Consent Decree to end ocean disposal of sludge
1980
Energy recovery system construction begins
1983
First energy produced; secondary treatment system capacity expanded to 500,000m³/day
1987
Ocean discharge of sludge ceased
November 1987
New gas and steam turbines installed; air emissions cut by 80%; secondary treatment capacity increased to 800,000m³/day
1988
Energy recovery system fully operational
1989
Phase I construction begins on full secondary treatment facilities
1991
Digester expansion begins
1992
First modules of new secondary treatment operational; co-generation expansion begins
1994
Technical support facility / modernization of the primary treatment begins
1995
Phase I completed / Phase II begins
1996
Expanded Digester Facilities begin operation
1997
Full secondary treatment for all flows
1998
Key Players:
Plant owners
City of Los Angeles
Plant operators
Bureau of Sanitation
Regulators
Environmental Protection Agency; LA Regional Water Quality Control Board
Phase I of the secondary treatment; WAS thickening; digester screening facilities.
Kiewit Pacific Co
Phase II
Tutor-Saliba-Perini-Scott JVC
Technical support facility and the modernization of the primary treatment
M.A. Mortenson
Ductile Iron pipework
American pipe
Coatings
Murphys Industrial
Design engineering team
Daniel Mann Johnson & Mendenhall / Black & Veatch
Other contractors
Dillingham/Ray Wilson; Harris Contracting
