Clif Bar Pretreatment Larry Rupp and Jason King Keller Associates - - PowerPoint PPT Presentation

CITY OF LEWISTON WWTP 2020 IMPROVEMENTS 1

Clif Bar Pretreatment

Larry Rupp and Jason King Keller Associates Meridian, Idaho

Pacific Northwest Pretreatment Workshop

September 12, 2017

City of Twin Falls

• Population: 48,260*
• Major Industries
• Glanbia Nutritionals (cheese)
• AmeriPride (uniforms)
• KapStone (cardboard)
• Independent Meat Co. (pork)
• Conagra (potato)**
• Chobani (dairy)**
• WWTP Capacity

* City also treats the wastewater for the City of Kimberly (Pop. ~3,700) ** City owns and operates the pretreatment system at this industrial plant

Clif Bar Bakery/Pretreatment Facility

• 1st Clif Bar-Owned Bakery
• Pretreatment Facility constructed at

same time as Bakery

• City to own and operate Pretreatment

Facility

• Clif Bar potentially to own and operate

in the future

• Intermittent flows with variable

concentrations, pH, and temperature

• Expansion potential

Preliminary Design Considerations

• Process understanding
• Sampling
• Design criteria
• Preliminary discharge permit
• Pretreatment options
• Pretreatment selection

Process Understanding

• Collaboration with Indianapolis Facility and Clif Bar
• Historical sampling results
• 10-day sampling procedure
• Biochemical oxygen demand (BOD)
• Total suspended solids (TSS),
• Volatile suspended solids (VSS)
• Chemical oxygen demand (COD)
• Soluble COD
• Total Kjeldahl nitrogen (TKN)
• Ammonia (NH3-N)
• Oil and grease (O&G)
• Flow
• Temperature

Historical Sampling Results

10-Day Sampling Results

Design Criteria

• Influent Design Criteria
• Average Day Flow – 14,800 gpd
• Maximum Month Flow – 23,000 gpd
• Maximum Day Flow – 38,800 gpd
• Peak Hour Design Flow – 240 gpm
• Design Influent BOD5 Concentration – 4,160 mg/L
• Design Influent TSS Concentration – 1,100 mg/L
• Design Influent O&G Concentration – 90 mg/L
• Other considerations
• Influent temperature
• Influent pH

Pretreatment Options

Factors PMT Percentage 1. UASB 2. UAFF 3. UASB/ UAFF

• 4. SBR 5. TF/SC 6. AS 7. MBBR 8. RBC 9. MBR 10. Evaporator

Sustainability 10% 4 4 4 3 3 3 3 3 3 1 Experience 5% 4 4 4 4 4 4 3 1 1 1 Operability 10% 3 3 3 4 3 3 3 2 1 2 Process Stability 10% 3 3 3 3 4 3 4 2 3 4 Ease of Startup 5% 3 3 3 4 4 4 4 3 3 4 Toxic Sensitivity 10% 2 2 2 4 4 4 4 3 3 4 Capital Cost 5% 2 2 2 3 3 3 3 3 2 1 Installation Cost 5% 3 3 3 3 3 3 3 3 2 5 O&M Cost 9% 3 3 3 3 3 3 3 3 1 1 Energy Cost 5% 3 3 3 3 3 3 3 3 2 1 Sewer Fee Cost 9% 4 4 4 4 4 4 3 2 5 5 Dewatering Cost 5% 4 4 4 3 3 3 3 3 3 2 Footprint 2% 4 4 4 3 3 2 3 1 4 5 Expandability 10% 4 4 4 3 3 2 3 1 2 5 Total 100% 3.26 3.26 3.26 3.39 3.39 3.17 3.25 2.37 2.47 2.94

Anaerobic (UASB)

SBR WASTE FLOW FROM CLIF BAR FACILITY SCREEN EQ TANK TO CITY UASB

Adv.

• Effective for high-strength wastewater
• Not affected by O&G

Disadv.

• Microorganisms do not respond quickly

to loading changes

• Requires heating
• Requires gas collection, flaring

TF/SC

WASTE FLOW FROM CLIF BAR FACILITY SCREEN EQ TANK TRICKLING FILTER SOLIDS CONTACT CLARIFIER TO CITY

Adv.

• Effective
• Stable
• Handles variable loads/ flows well

Disadv.

• Requires additional pumping and

building space

• Influenced by temperature and

pH changes

• High capital cost

SBR

WASTE FLOW FROM CLIF BAR FACILITY SCREEN EQ TANK SBR TO CITY

Adv.

• More stable than anaerobic

treatment options

• Not sensitive to toxins
• Cost effective
• Smaller footprint

Disadv.

• Expensive expansion
• Nutrient, pH, and O&G control

important

• Requires careful solids management
• Not as stable as TF/SC or MBBR
• ptions

WASTE FLOW FROM CLIF BAR FACILITY SCREEN EQ TANK MBBR TO CITY DAF

Adv.

• Stable
• Cost effective
• Not sensitive to toxins
• Effective at removing O&G

Disadv.

• Nutrient, pH, and O&G control

important

Selected Alternative - MBBR

Industrial Discharge Permit Development

• EPA Requirements
• WWTP Capacity
• Collection System Capacity
• Compliance point
• Startup/Monitoring

Compliance Point

• Influent vs effluent
• Design concerns
• Flow measurement

with intermittent flow

• Process concerns
• Temperature and pH
• Equalization tanks

Compliance

• Influent manhole
• 24-hour composite sampler for BOD5, TSS
• FOG grab sample
• Influent flow rate (Parshall flume), pH, temperature sensors upstream
• f EQ – continuous readings
• If temperature or pH exceeds criteria, EQ pumps will automatically

shut off to protect MBBR

• Effluent manhole
• 24-hour composite sampler for BOD5, TSS
• FOG grab sample
• Effluent flowmeter (submerged magmeter) downstream of DAF

Discharge Permit

Design Overview

Headworks

• Materials of construction
• Monitoring
• Influent Sampling

Equalization Tanks

• Operational Flexibility
• Series
• Parallel
• Isolation
• Monitoring
• pH/Temperature
• Process Control
• Chemical Feed Pumps
• MBBR Feed Pumps

MBBR Tanks and DAF

• Tank Bypass
• Recycle effluent
• Effluent Monitoring
• Composite sampler

Solids Handling

• Sludge Disposal
• Liquid
• Dewatered

Construction

• Schedule
• Designed in 6 months
• Construction in 12 months
• Pre-purchase equipment
• Pre-qualify contractors
• Design review meetings

Construction

• Treatment during construction
• Temporary tanks
• Bypass pumping
• Chemical adjustment
• Coordination
• Clif Bar
• City
• Contractor
• Keller
• Temporary discharge permit

Temporary Discharge Permit (Effluent)

Initial Startup

• Seed sludge
• Recycling effluent
• Supplement food source
• Foam Control

Monitoring - Flow

Monitoring - BOD

Monitoring - TSS

Questions?