Wastewater Pre-treatment System for Terrapin Beer Co.Team Members: Ryan Brush, Kaitlyn Ruff, Justin Rey, Kevin Metz, & Veronika Crumpler

Faculty Advisor: Dr. Tom Lawrence

Introduction Financial Analysis

Site Selection

Sponsor/Client: Terrapin Beer Company

Decision MatrixConclusions & Recommendations

Founded in 2002, Terrapin Beer Co. is a stable landmark in the city of Athens, Georgia. However, their large-scale brewing process has resulted in a significant waste stream hazardous to the environment. Athens Clarke County will now begin to regulate and fine the brewery if a solution is not found. The objectives of this design project were to determine the most efficient and sustainable solution to pre-treat effluent to meet Athens-Clarke County standards, maintain the aesthetics of the brewery, and determine actual sizing, location, and design for the implementation of the chosen system within the Terrapin facility.

Process Flow Design

Terrapin Brewery Wastewater Pretreatment System Site

No Pre-treatment

Aerobic Anaerobic Living Machine

Criteria WF UW W UW W UW W UW W

Initial Cost 10 4 40 3 30 2 20 1 10

Operating Cost 8 1 8 2 16 4 32 3 24

Allows for Growth 5 4 20 1 5 3 15 2 10

Discharge Water Quality

7 0 0 4 28 2 14 3 21

Aesthetics, odor 5 4 20 1 5 3 15 2 10

Public outreach, local impact

3 0 0 2 6 3 9 4 12

Total, unweighted 13 12 17 15

Total, weighted 88 90 105 87

★ Dr. K.C. Das, Anaerobic Digestion Specialist, provided expertise in designing the equalization tank and grit chamber.

★ Brian Hollinger, VP of Operations at Terrapin, provided valuable information regarding the company’s current production rates and future benchmarks.

★ Bob Salvatelli, Sustainable Water Representative, provided information about a similar project at Emory University.

ACC Water Requirements Average Water Quality

BOD < 500 8357

TSS < 500 1888

Phosphorus < 15 44

Nitrogen < 100 160

● Anaerobic digestion is the least disruptive method of pretreatment and is most advantageous financially○ Biogas generation, while neglected in calculations, offers potential

renewable source of fuel● Inconsistent flows create design challenge and warrant use of an

equalization tank● A 24 hour composite flow measurement and effluent sample would yield

more accurate model for design● Additional front end methods of solids removal could greatly impact quality

of wastewater○ Screening wastewater before pretreatment○ Decanting centrifuge for yeast recovery

Acknowledgements

Year BBL/year Anaerobic Aerobic No Pre-Treatment

2018 85,000 $3,196,628 $3,160,429 $3,132,915

2020 105,000 $5,408,242 $5,373,492 $4,916,404

2025 150,000 $11,043,430 $11,006,333 $9,254,262

2030 150,000 $15,511,885 $15,470,097 $12,647,120

2035 150,000 $18,697,831 $18,652,700 $15,066,182

Comparison of present value at 7% interest of aerobic, anaerobic, and no pretreatment options

Water quality criteria for design of pretreatment process (ppm)

Introduction Financial Analysis

Water Quality Criteria

Process Flow Diagram

Tank Design● Grain particle density determined experimentally using Stokes equation○ vc = gD2(ᷝp-ᷝf)/(18*ᶞ)

● Scouring velocity of grain particles and inorganics determined using Shield’s equation○ vscour= (8Ṃ(ᶕp-1)Dp/f)

½

● Scouring velocity used to determine grit chamber sizing and flow rate● Equalization tank designed using model of variable flow rate shown below○ VEQ = 3700 ft3

Decision matrix used to quantify the degree to which each option satisfies criteria. Weighted values based upon percieved importance to overall design.