FACILITY: City of Corona Wastewater Treatment Plant No. 3

LOCATION: Corona, CA

GEO. AREA: Southern California

STATUS 07/14: Operational

CONSTRUCTION: Unknown

ENGINEERING: Carollo Engineers

MBR MANUFACTURER: GE

OPERATED BY: Unknown

FUNDED WITH: Unknown

COMMENTS: First MBR plant to meet California Title 22 discharge standards.

Location:

Corona, California, USA

Commissioned / installed date:

2001

Application and type:

Municipal

Technology configuration used:

Hollow fibre

MBR technology / membrane product used:

GE ZeeWeed

Scale of installation:

Small-scale municipal

Capacity range MLD:

5-20

Average daily flow:

3.8 MLD

Peak daily flow:

8.5 MLD

Primary consultant / contractor:

GE Water & Process Technologies

Corona Wastewater Treatment Plant

Installation overview

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About Corona Wastewater Treatment Plant

First MBR plant to meet California Title 22 discharge standard

Process Overview

In 1998, CH2M Hill awarded a contract to GE Water & Process Technologies, to supply aZeeWeed MBR (membrane bioreactor). The system incorporates reinforced ZeeWeed 500immersed membranes, which provide a physical barrier for separating biosolids from thetreated wastewater. The process combines aeration and solids separation (filtration) into asingle-step, resulting in a compact treatment facility.

One major reason for the selection of the ZeeWeed MBR process was the small footprint. TheZeeWeed MBR occupied only 25% of the land area required by alternative conventionalprocesses.

The ZeeWeed MBR system is designed to meet the following discharge criteria: biologicaloxygen demand < 5 mg/L; total inorganic nitrogen < 10 mg/L; total suspended solids < 5 mg/L;and turbidity of < 0.2 NTU.

Solution

The facility consists of three separate process trains. The process trains are divided into twodistinct zones: anoxic and aerobic/membrane filtration.

The pre-screened wastewater is fed directly to the anoxic zone, where denitrification occurs.The mixed liquor then flows by gravity to the aerobic zone, where BOD oxidation andnitrification occurs.

The ZeeWeed immersed membranes are located in the aerobic zone. The membranemodules are connected to a permeate pump, which creates a low pressure suction of -1 to -8psi (-6.9 to -55 kPa). Water is drawn from the mixed liquor through the surface of themembrane in an “outside-in” flow path. From there, the effluent is pumped through thedischarge system. Air is supplied to the membranes, where it emerges as a coarse bubblestream from the bottom of the membrane module. This membrane aeration performs severalkey functions, including mixing of the biomass, membrane surface cleaning, and provides aportion of the aeration required of the biomass.

Results

The effluent from the plant is designed to meet California Title 22 standards, and is suitable forreuse on a nearby golf course for landscape irrigation, or can be safely discharged to a localcreek bed.

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More information

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MemBioreactors903fs.indd 10/8/03 carollo.com

Carollo Meets the Challenges of Implementing MBR Projects

Mem

bra

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Bio

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"Dedicated

to creative,

responsive,

quality

solutions

for those

we serve."

The use of membrane bioreactors (MBRs) is a hot topic when it comes to discussing process treatment alternatives for activated sludge. MBR technology has evolved in the last five years from an approach applicable for plants with capacities of up to 1 or 2 mgd to a technology that is suitable for very large plants.

MBR IssuesSpecific issues that relate to MBR projects include:

Piloting - is this needed or not?

Selection of the membrane supplier - there are several to choose from.

Location of the membranes - within the existing basins or not?

Pretreatment - how much is required?

Membrane cleaning - how will this impact the treatment process?

Dealing with cleaning chemicals and residuals.

Dealing with peak flows.

Experience CountsCarollo has piloted and designed a number of MBR systems. We have developed computer modeling tools to help us quickly evaluate process issues and sizing options for our clients. Our experience with MBR technology can be a valuable tool to help you address your project needs. Project examples include:

City of Corona, California - Wastewater Treat-ment Plant No. 3. Carollo prepared preliminary design for two treatment alternatives as part of the design/build delivery of Corona’s Wastewater Treat-ment Plant No. 3. The project involved preliminary design (approximately 30 percent) and specifica-tions for a conventional biological nutrient removal (BNR) activated sludge treatment plant and an advanced MBR treatment plant (manufactured by Zenon). Carollo prepared design criteria for both treatment alternatives and assisted with the permit-ting process. Corona selected a Zenon membrane bioreactor over conventional treatment systems. The plant came on-line in 2001.

King County, Washington - Pilot Testing. King County’s Wastewater Division enlisted Carollo to pilot test an MBR to assess the feasibility of treating wastewater to a level suitable for irrigation reuse. The goal of the pilot test was to provide a basis for the design of a full-scale water reclamation facility in the Sammamish River Valley. The project involved

Carollo developed the first project in California to bid a wastewater treatment plant with membrane technology for the City of Corona.

The MBR pilot facility at King County’s Hollywood Pump Station provided reclaimed water for small garden test plots to help gain public acceptance.

Carollo's modeling software helps answer "what if?" questions and assists with design.

MemBioreactors903fs.indd 10/8/03 carollo.com

applying reclaimed water from the test facility to small garden test plots managed by various lo-cal agricultural entities. Locating the MBR test facility at the Hollywood Pump Station along the Sammamish River Trail, a popular recreational area, exposed the public to the project and helped to foster acceptance for the use of reclaimed wa-ter for irrigation among both residents and local growers.

King County, Washington - Sammamish Valley Wastewater Reclamation Plant. Carollo provided detailed design of the Sammamish Valley Wastewa-ter Reclamation Plant, a satellite treatment facility with an ultimate design capacity of 5 mgd. Following a six-month pilot plant program, Carollo recom-mended an MBR to reliably produce effluent better than the Class A requirements. Carollo pre-quali-fied and then pre-bid the membrane portion of the plant early in the design process, saving time and allowing the design to proceed around the selected MBR system. Four membrane suppliers completed prequalification documents: Kubota, Mitsubishi, U.S. Filter, and Zenon. King County received bids from two prequalified suppliers.

City of Redlands, California - Recycled Water Treatment Facility. Carollo, assisted by others, designed an upgrade of Redlands’ existing treatment facility to provide recycled water for use as cooling water by a local power generator. Design of this MBR plant, expandable to 9.5 mgd, allows for removal of

total inorganic nitrogen to a level of less than 10 mg/L to meet Basin Plan requirements, and treat-ment of 6 mgd of the total flow to meet California Title 22 requirements for low turbidity, disinfected effluent suitable for use in cooling towers and for crop irrigation. The plant uses immersed microfiltra-tion membranes in an MBR followed by disinfection. This arrangement allows Redlands to install reverse osmosis (RO) downstream to meet future total dissolved solids (TDS) discharge requirements, if needed.

Bell Carter Olive Company, California - Industrial Wastewater Services. For over 15 years, Carollo has provided Bell Carter, the nation’s largest black-ripe olive producer, with comprehensive industrial waste-water consulting services. A recent project included modifying the wastewater treatment process at their Corning, California, facility into a two-step MBR process. The existing aerated lagoons feed a mem-brane facility that separates the mixed liquor solids

from the effluent. The addition of direct membrane filtration has reduced Bell Carter’s dependence on the costly chemicals necessary to encourage separa-tion by dissolved air flotation. Carollo administered process pilot testing, developed the facility design criteria, and provided technical advisory consulting for the construction of the facility.

Carollo has also conducted numerous evaluations of the MBR process for plant expansions/audits, etc. Some examples include:

City of Springfield, Missouri - Northwest Waste-water Treatment Plant Expansion.

South Salt Lake Valley, Utah - Water Reuse Study.

Orange County Sanitation District, California - Secondary Treatment Capacity Expansion.

Please contact us if you have questions or need more information.

Carollo designed the largest MBR on the West Coast for the City of Redlands, California, shown here under construction.

Carollo conducted MBR pilot testing using Kubota treatment technology at one of King County's treatment plants.

Carollo’s development of a successful membrane pilot testing strategy allowed optimization of design criteria for Bell Carter’s full-scale membrane treatment facility.