City of Redlands Wastewater Treatment Plant. Redlands, CA LOCATION: Carollo Engineers; CH2M HILL MBR MANUFACTURER: COMMENTS:

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1 FACILITY: City of Redlands Wastewater Treatment Plant LOCATION: Redlands, CA GEO. AREA: Southern California STATUS 07/14: Operational CONSTRUCTION: ENGINEERING: Carollo Engineers; CH2M HILL MBR MANUFACTURER: GE OPERATED BY: FUNDED WITH: COMMENTS:

2 Water Reuse Case History Redlands Water Recycling/Power Generation Reuse Project Redlands, California, USA Municipality: City of Redlands Company: Mountainview Power Company Project Fast Facts Flowrate: 4,166 gpm (946 m 3 /hr) Industry: Power Use: Cooling and Process Water Conveyance: Underground Pipeline The semi-arid City of Redlands is located about 50 miles (80 km) east of Los Angeles, California. The nearby 1,056-megawatt Mountainview Power Company (MPC) was planning to use a series of large wells for cooling water that would place a strain on the region s future groundwater supply. To conserve its precious supplies, the City advocated for recycled water to supply the cooling towers using an advanced treatment technology, known as a membrane bioreactor (MBR), to provide the necessary high-quality cooling water in an environmentally and economically better way. The City of Redlands reached an agreement with MPC to provide 6,000 acre-feet per year (AFY) of recycled water for the cooling towers that meets state of California Title 22 requirements. A treatment alternative feasibility study was conducted to select a treatment alternative that would provide the desired water quality for identified reuse options and also lend itself for easy retrofit or expansion in the future. The study concluded that use of membrane technology was the preferred treatment option. CH2M HILL, as part of a design team, helped plan and design the water recycling treatment facilities. Several unique and challenging features of the project included stringent water quality requirements, a highly compressed schedule, and the large-scale use of MBR technology. In addition to the cooling water supply needs, the facility also produces discharge quality effluent. As such, the conventional activated sludge (CAS) treatment system at the existing plant was maintained as a separate train to produce 3 mgd effluent. The MBR treatment train was designed for a 6 mgd and 6.6 mgd average and peak daily flow, respectively. The design was based on GE Zenon MBR system, which was chosen because of its ability to fit the constrained footprint while providing high-quality product water for the cooling towers. The facility was recently expanded to produce 9 mgd product water to meet MPC s increasing recycled water needs. The facility contains sidestream drum screens and screenings compactors for processing a fraction of the mixed liquor recycle flow, rather than treating the entire flow. The MBR design also includes scum removal pumps and tank overflow provisions. As a result of value engineering, the in-line UV disinfection system was replaced with sodium hypochlorite disinfection providing substantial cost savings of about $1 million to the City. This project earned the California Water Environment Association and Santa Ana River Basin Section Engineering Achievement Awards for innovative applications in wastewater treatment. Our motive is simple: to promote beneficial wastewater reuse around the world today. Join us and help make matches happen. Because no water should be wasted.

3 Case Study City of Redlands Wastewater Treatment Plant Application: Treatment of municipal wastewater for industrial reuse meeting Title 22 discharge standards Capacity: 6.6 MGD (25,000 m 3 /day) Location: City of Redlands, California, United States Commissioned: June 2004 Conserving the precious groundwater supplies was the main driver for Redlands to go before the California Energy Commission in 2000 and advocate for recycled water to supply the cooling towers at the 1,056 megawatt Mountainview Power Company (MPC) power plant. The MPC s plan to use a series of large wells for cooling water would place a tremendous strain on the region s future groundwater supply. However, an advanced wastewater treatment technology, such as a membrane bioreactor (MBR), could provide the necessary high quality cooling water and is an environmentally and economically better way to produce the necessary process water. Solution Membrane bioreactor technology is the only way for the City of Redlands to establish an efficient and effective water recycling program that will conserve our potable water supplies Douglas Headrick, Chief of Water Resources City of Redlands, California. Challenge Semi-arid Redlands, about 50 miles (80 km) east of Los Angeles, receives only about 15 inches (38 cm) of rainfall annually, and relies partly on wells to supply water to the area s 75,000 residents during peak summer usage. However, ongoing development and anticipated periods of below-average rainfall will continue to put a strain on the area s water supply. In December 2000, the City of Redlands began searching for the best available technology to upgrade its existing 9.5 MGD (35,960 m 3 /day) secondary wastewater treatment plant (WWTP) with a technology that could produce 6 MGD (22,710 m 3 /day) of high quality recycled water that exceeds California s Title 22 requirements. Working with Carollo Engineers San Bernardino office and CH2M Hill, the City examined three alternatives: 1) Conventional activated sludge followed by tertiary filtration and chlorine contact basins; 2) Infiltration basins to act as filters for secondary effluent followed by extraction wells that recover groundwater; 3) Advanced MBR treatment. The examination revealed that MBR technology would provide the best alternative for the upgraded plant to ensure compliance with the project selection criteria. Membrane systems from three manufacturers were evaluated, and at the conclusion the City selected ZeeWeed* reinforced hollow fiber ultrafiltration membranes from GE s Water & Process Technologies. Zeeweed was selected for the superior quality effluent that the technology is capable of Find a contact near you by visiting and clicking on Contact Us. * Trademark of General Electric Company; may be registered in one or more countries. 2011, General Electric Company. All rights reserved. CS-RDLDS-MUNWW-EN-1206-NA GE Logo.doc May-11

4 producing, robust performance, and high value that the system provides for both the City of Redlands and MPC. The 14,000-foot (4,270-meter) distribution line that serves the power plant is equipped with many turnouts to also serve other potential customers along the way. Currently the surplus reuse water is sent to percolation ponds to slowly trickle back into the water table, but Redlands hopes to eventually sell recycled water for irrigation at orange groves, golf courses, city property and also for dust suppression at the neighboring landfill site. Process Overview The complete Redlands WWTP is capable of treating 9.5 MGD (35,960 m 3 /day average day flow) of which 6.0 MGD (22,710 m 3 /day) is treated by the MBR system (6.6 MGD (24,980 m 3 /day) peak flow), and the remainder is treated by the upgraded conventional system. The WWTP receives municipal wastewater, which is collected in the headworks and passes through a 0.5-inch (13-mm) coarse screen and grit removal system before flowing into primary clarifiers. Effluent from the primary clarifiers flows by gravity to equalization ponds, and is pumped to a metercontrolled distribution system that divides the flow between the MBR and conventional treatment systems. In the biological reactor, wastewater first enters the anoxic zone for denitrification, followed by an aeration zone for nitrification. Mixed liquor then flows to six membrane tanks each containing 15 cassettes of ZeeWeed ZW500c reinforced UF membranes. Reinforced ZeeWeed membranes offer exceptional strength and durability to withstand the harsh, high solids environment found in an MBR and are proven performers in hundreds of plants throughout the world. The membranes are immersed directly into the mixed liquor and draw treated effluent into the fiber using a gentle suction. A ZeeWeed membrane fiber acts as a physical barrier, preventing suspended solids and pathogens from entering into the final effluent. Turbidity meters ensure that each train meets turbidity requirements for Title 22 compliance (less than 0.2 NTU 95 percent of the time, 0.5 NTU 100 percent of the time). Treated effluent is then collected in a common header pipe and flows to a chlorine contact disinfection system. Typical Treated Water Results Parameter Influent Effluent BOD (mg/l) 160 < 5 TSS (mg/l) 130 < 5 Total Nitrogen (mg/l) 24 < 10 Turbidity (NTU) NA < 0.2 Page 2 Case Study

5 CITY OF REDLANDS, CALIFORNIA Recycled Water Treatment Facility H I G H L I G H T S Pre-negotiated contract for membranes and related equipment. Largest wastewater MBR in California at the time of design. Able to recoup some of the cost of treatment through sale of effluent. Able to offset the use of scarce groundwater in the underlying basin. Able to beneficially dispose of effluent as an alternative to the current (potentially limited) percolation of effluent. The City of Redlands retained Carollo, assisted by another consultant, to upgrade its existing treatment facility to provide recycled water for use as cooling water by a local power generator. The upgraded facility will remove total inorganic nitrogen from 9.5 mgd to a level of less than 10 mg/l to meet Basin Plan requirements. It will also treat 6 mgd of the total flow to meet California Title 22 requirements for low turbidity, disinfected effluent suitable for use in cooling towers and crop irrigation. The initial phase of the project included an evaluation of treatment processes capable of producing effluent of the required quality and assistance with power company negotiations regarding effluent quality. Selected processes included new technology using immersed MF membranes in a membrane bioreactor, followed by disinfection with sodium hypochlorite. This arrangement allows Redlands to install reverse osmosis downstream of the MBR and upstream of the chlorination point to meet future total dissolved solids (TDS) discharge requirements if needed. Carollo s responsibilities also included both preliminary and final design of modifications to the existing activated sludge treatment basins to increase the plant capacity and allow a portion of the basins to be operated at a higher mixed liquor concentration (8,000 mg/l) in association with the membranes. Carollo designed a separate membrane tank and a chemical storage/feed system for the MBR system. In addition to upgrades/additions to provide nitrogen removal and tertiary effluent, the project involved upgrade, rehabilitation, or replacement of most of the major elements of the plant (some up to 40 years old) to reduce O&M requirements and restore reliability. These included the plant s electrical, control, and pumping systems. V:\CompanySOQs\LowPressureMembranes\Indd\02KeyAchievLpm.indd The Redlands Recycled Water Facility employs new technology using immersed MF membranes in a MBR followed by disinfection with sodium hypochlorite. k e y a c h i e v e m e n t s 15

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