Water Treatment Optimization Overland Park Marriott

December 10, 2014

WATER TREATMENT

One Size Does Not

Fit All!

All Methods are not the

same!

TOWER INTERNALS

PLATE & FRAME HEAT EXCHANGER

HEAT EXCHANGER CLEANING Beer/Mash exchanger cleaning and inspection Propagation Fermentation Mash Cooler Cookwater Preheater

Counter flow can greatly aid in complete cleaning of heat exchanger surfaces containing biofilms

Biofilms – Consist of bacteria living within a matrix

of excreted DNA, proteins, and polysaccharide compounds. This matrix protects the cells

from all antimicrobials

HEAT EXCHANGER CLEANING

WHY TEMPERATURE MATTERS

High temperature may result in damage to yeast cell

Larger the temperature increase, the greater the yeast cellular damage. Increases above 35°C (97°F) may not only increase the cell damage but may result in decrease in the final [EtOH] under some conditions.

Thermal damage results in a reduction (denaturation) of:

Proteins Nucleic acids

HEAT EXCHANGER IN PROCESS

SLIMED UP TOWER FILL

SLIME BUILDUP

Anaerobic Bacteria from Basin

SAND FILTER

CORROSION CAUSED BY SRB

MICROBIOLOGICALLY INDUCED (MIC)

pH (Range 0 – 14) “The acidity or alkalinity of a liquid”

Sulfuric Acid RO Cooling Tower Vinegar City Tap Boiler Caustic

RELATIVE ACTIVITY vs. pH

pH %HOCL %HOBR 6 97 100 7 78 98 8 26 83 9 3 33

MICROBIO FOULING PREVENTION

Keep System Clean

Eliminate “Dead Legs”

Minimize Exposure to Sunlight

Employ Effective Biocide Program

MICROBIO MONITORING

Visual Inspection

Monitoring Heat Exchanger ∆P and ∆T

Bacteria / Fungi Testing of Tower Water

o Aerobic/Fungi Paddle Cultures

o Dip Slides

o Anaerobic Specific- Bart, SRB, IRB

BART ANAEROBIC CULTURES

FILLING BART IRB CULTURE

AMOEBA FILAMENTS

Laboratory Analysis

X-RAY TECHNOLOGY

ZERO GRAVITY SYSTEM 2000

ZERO GRAVITY 8 POD UNIT

SPECIALIZED EVAPORATION

Concentrate Thin Stillage Syrup After De-Oiling from Typical ~36%TS to ~48%TS Achieve This Evaporation Duty Using Mechanical Vapor Recompression (MVR) Heating with Electrical Power Without Disrupting Thermal Energy Balance of Existing Evaporator Systems Reduce Water Evaporation Duty and Energy Duty of Dryer by ~40% (per dry syrup solids basis)

EVALUATING ZLD

Potential impacts to production

Recycling water to new areas

Biocides limited (Chlorine-ClO2)

ZERO LIQUID DISCHARGE

ZLD is somewhat of misnomer; Discharge issues are about the dissolved and suspended solids in the water, not the liquid itself.

ZLD means not allow any waste and/or process water to be discharged from the plant.

WHAT ARE THE FINANCIAL INCENTIVES FOR ZERO LIQUID DISCHARGE (ZLD)

Eliminates restrictive

operational component from plant

Eliminates discharge fines and possible

shutdowns

Enables plant

expansion projects

Reduces or

Eliminates discharge surcharge

(POTW)