Clif Bar Pretreatment

Transcription

1 Pacific Northwest Pretreatment Workshop September 12, 2017 Clif Bar Pretreatment Larry Rupp and Jason King Keller Associates Meridian, Idaho CITY OF LEWISTON WWTP 2020 IMPROVEMENTS 1

2 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

3 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

4 Preliminary Design Considerations Process understanding Sampling Design criteria Preliminary discharge permit Pretreatment options Pretreatment selection

5 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

6 Historical Sampling Results

7 10-Day Sampling Results

8 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 BOD 5 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

9 Pretreatment Options Factors PMT 3. UASB/ 1. UASB 2. UAFF Percentage UAFF 4. SBR 5. TF/SC 6. AS 7. MBBR 8. RBC 9. MBR 10. Evaporator Sustainability 10% Experience 5% Operability 10% Process Stability 10% Ease of Startup 5% Toxic Sensitivity 10% Capital Cost 5% Installation Cost 5% O&M Cost 9% Energy Cost 5% Sewer Fee Cost 9% Dewatering Cost 5% Footprint 2% Expandability 10% Total 100%

10 Anaerobic (UASB) WASTE FLOW FROM CLIF BAR FACILITY EQ TANK UASB SBR TO CITY SCREEN 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

11 TF/SC WASTE FLOW FROM CLIF BAR FACILITY EQ TANK TRICKLING FILTER SOLIDS CONTACT CLARIFIER TO CITY SCREEN Adv. Effective Stable Handles variable loads/ flows well Disadv. Requires additional pumping and building space Influenced by temperature and ph changes High capital cost

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

13 Selected Alternative - MBBR WASTE FLOW FROM CLIF BAR FACILITY EQ TANK MBBR DAF TO CITY SCREEN Adv. Stable Cost effective Not sensitive to toxins Effective at removing O&G Disadv. Nutrient, ph, and O&G control important

14 Industrial Discharge Permit Development EPA Requirements WWTP Capacity Collection System Capacity Compliance point Startup/Monitoring

15 Compliance Point Influent vs effluent Design concerns Flow measurement with intermittent flow Process concerns Temperature and ph Equalization tanks

16 Compliance Influent manhole 24-hour composite sampler for BOD 5, TSS FOG grab sample Influent flow rate (Parshall flume), ph, temperature sensors upstream of 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

17 Discharge Permit

18 Design Overview

19 Headworks Materials of construction Monitoring Influent Sampling

20 Equalization Tanks Operational Flexibility Series Parallel Isolation Monitoring ph/temperature Process Control Chemical Feed Pumps MBBR Feed Pumps

21 MBBR Tanks and DAF Tank Bypass Recycle effluent Effluent Monitoring Composite sampler

22 Solids Handling Sludge Disposal Liquid Dewatered

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

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

25 Temporary Discharge Permit (Effluent)

26 Initial Startup Seed sludge Recycling effluent Supplement food source Foam Control

27 Monitoring - Flow

28 Monitoring - BOD

29 Monitoring - TSS

30 Questions?