Chloramine Booster Systems for Reservoirs 1A, 1B, 4, and 5
Burbank Water & Power (BWP) operates a water treatment, distribution, and storage system in the City of Burbank. BWP’s water supply is sourced from local groundwater and treated surface water imported through the Metropolitan Water District of Southern California (MWD).
Reservoirs 1A, 1B, 4 (Palm Reservoirs), and Reservoir 5, serve as the primary storage reservoirs for Zone 1 with a total capacity of 45.5 million gallons (MG). This accounts for 75% of the total storage volume in the system. These reservoirs supply water to Zones 2 and 3 and their respective storage reservoirs before the water is pumped to higher elevation zones.
Situation
Due to the potential formation of elevated levels of chlorination byproducts, BWP currently maintains chloramine as the secondary disinfectant in the distribution system. The City of Burbank (City) adds chloramine to its treated groundwater supply before it is blended with the purchased MWD water, which already contains chloramine. One of the challenges facing the City’s distribution system is excessive loss of the chlorine residual, particularly in the Zone 1 reservoirs, which ultimately feed the zones at the higher elevations.
In 2020, BWP contracted with a consultant to perform a conceptual engineering analysis for chloramine boosting systems at the Palm Reservoirs and Reservoir 5. The analysis identified chlorine loss in these reservoirs and recommended two potential solutions:
- Modify the piping to lower the water age in the reservoir, or
- Construct chemical feed systems to maintain residual chlorine levels above a preset minimum value.
An In-Reservoir Chloramine Boosting System was recommended because of the ability to design each system and its components to BWP’s specific needs at each reservoir.
Scope of Work
LEE + RO is designing new 0.7% hypochlorite solution On-site Generation (OSG), bulk brine/salt, and 40% ammonium sulfate systems, including all equipment, connected piping, foundations, containment and separation of chemicals, masonry block building, all civil, structural, architectural, mechanical, electrical, and instrumentation & control designs , HVAC and eyewash/shower stations for fully operational reservoir management and chloramine boosting systems. The design also accounts for site modifications and improvements, such as relocation of conflicting utilities, grading, and fencing.
