HIGH STRENGTH WASTE STREAMS FROM MICROBREWERIES...Hot trub Proteins, sludge, and wort, TSS of 35,000...
Transcript of HIGH STRENGTH WASTE STREAMS FROM MICROBREWERIES...Hot trub Proteins, sludge, and wort, TSS of 35,000...
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HIGH STRENGTH WASTE
STREAMS FROM
MICROBREWERIESA Case Study in Permitting Beale’s Beer in the Town of Bedford, VA
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AGENDA
General review of the brewery process, terminology, and equipment.
Give an overview of the types and sources of wastewater in breweries.
Provide typical ranges of pollutant concentrations before pretreatment.
Give an overview of problems associated with this type of discharge.
Present case study of permitting the local microbrewery in the Town of
Bedford, Virginia.
Solutions to help deal with high strength sidestreams.
Permit special conditions to help manage the facility’s discharge moving into
the future.
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Sources of Effluent Loading
Source Operation Characteristics
Mash Tun Rinsing 3,000 ppm BOD
Cellulose, sugars, amino
acids
Lauter Tun Rinsing 10,000 ppm BOD, TSS 3,000 ppm from
cellulose, sugars, spent grains
Spent Grain Last runnings/washing Cellulose, nitrogenous material, very high
TSS (30,000 ppm), up to 100,000 ppm BOD
Boil Kettle Dewatering Sugars, nitrogenous residue, BOD of 2,000
ppm
Whirlpool Rinsing spent hops and
Hot trub
Proteins, sludge, and wort, TSS of 35,000
ppm with BOD of 85,000 ppm
Fermenters Rinsing Yeast, 6,000 ppm TSS, up to 100,000 ppm
BOD
Storage Tanks Rinsing Beer, yeast, protein, 4,000 ppm TSS, 80,000
ppm BOD
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Sources of Effluent Loading
Source Operations Characteristics
Filtration Cleaning, start up; end of filtration, any
leakage
Excessive TSS (up to 60,000 ppm), beer,
yeast, proteins, up to 125,000 ppm BOD
Beer Spills Waste, flushing, etc. 1,000 ppm BOD
Bottle Washer Discharges from washing operations High pH; high TSS & BOD
Keg Washer Discharge from keg during kegging operations Low TSS, ~ 400 ppm
Higher BOD levels
Miscellaneous Discharged cleaning/sanitation materials;
floor washing; flushing water, any boiler
blow-down, etc.
Relatively low TSS and BOD, but problem here
is due to pH and other chemicals discharged
to the sewer.
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Typical Ranges of Brewery Untreated “End-Of-Pipe” Wastewater Effluent
PARAMETER TYPICAL RANGE
Water to beer ratio 4-10 liter/liter
Wastewater to beer ratio 1.3-2.0 liter/liter lower than water to beer ratio
Biochemical Oxygen Demand (BOD) 600-5,000 ppm
Chemical Oxygen Demand (COD) 1,800-5,500 ppm
Nitrogen 30-100 ppm
Phosphorus 30-100 ppm
pH 3.0-12.0 S.U.
Total Suspended Solids (TSS) 200-1,500 ppm
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Effluent from individual process steps is variable.
1) Washing bottles produces a large volume but contains only a minor amount of
the discharged organics from the brewery.
2) Effluent from fermentation/filtering will be high in BOD and low in volume.
3) These account for about 3% of total volume but about 97% of all BOD.
4) Average pH of combined effluent will be about 7.0; but can fluctuate from 3.0
to 12.0 depending upon the use of acid and alkaline cleaning agents.
5) Waste beer pH normally falls between 4.0 and 5.0.
6) CIP effluent temperatures average about 86 degrees F.
Most brewers discharge over 70% of their incoming water as effluent.
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Beale’s Beer – Case Study in Permitting
Initial Water Authority testing revealed high temperature of the cooking wastestream: 38
degrees C.
Conductivity was around 7600. Other analysis results:
BOD in excess of 6200 mg/l TSS of 10,500 mg/l
TDS of 19,500 mg/l Zinc of 1.10 mg/l
Copper of 0.404 mg/l COD of 36,500 mg/l
Phosphorus of 17.3 mg/l Nitrogen as Ammonia of 12.1 mg/l
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LAB RESULTS
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LAB RESULTS
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CASE STUDY: BEALE’S BEER
Local limits:
BOD: less than 1,000 mg/l
COD: less than 2,000 mg/l
TSS: less than 1,000 mg/l
Ammonia: less than 100 mg/l
Copper: less than 0.2384 mg/l
Zinc: less than 0.3935 mg/l
Other metals with limits: cadmium, lead, mercury, nickel.
Oil & Grease less than 350 mg/l
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POTW
Design flow: 2.0 MGD
Dry weather daily average flow: 1.2 MGD
Discharge limits:
1) BOD: 6.97mg/l monthly; 10.5 weekly average
2) TSS: 30mg/l monthly; 45 weekly average
3) Ammonia: 1.4 mg/l (June – December)
4) Lead: 6.8 ug/l
5) Zinc: 59 ug/l
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POTW
If 1,000 mg/l BOD loading enters plant, we can meet our weekly average
discharge concentration but exceed our monthly average if this loading
consistently enters our plant.
Lead is not a concern at the present time.
Copper high levels are coming from brand new copper pipe. Ought to reduce
over time as interior surface of pipe becomes tarnished.
The BOD loading is a major concern because the plant is designed for
extended aeration. This is to fit the footprint of this older plant and allow for
acceptable effluent discharges.
Variable pH levels would cause us problems without some sort of equalization
onsite of the brewery.
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Permitting Classification
Determined to classify brewery as a SIU based upon potential to seriously
impact the biological processes of the treatment plant.
Brewery discharge comes to plant via a gravity line and does not go through any of
our pump stations.
Future expansion is part of their business plan.
May very well add a bottling line to the kegging operations.
Brewing both ale and lager beers.
They have ten fermenting vessels for use.
What happens if off-site disposal at a farm disappears in the future?
CIU designation could only apply if milling of grain was constant.
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WEB LINKS
http://www.epa.gov/npdes/industrial-wastewater
http://www.birkocorp.com/brewery/white-papers/wastewater/
http://extension.uga.edu/publications/detail.cfm?numbers-c992
http://brewerywastewater.com/
http://www.craftbrewingbusiness.com/equipment-systems/wastewater-basics-growing-craft-brewery/
http://clrblu.com/case-study/real-ale-brewing-co-tackles-discharge-limits/
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RESOURCES
Brewers Association Homepage – Water and Wastewater : Treatment/Volume
Reduction Manual
Brewers Association Homepage – Wastewater Management Guidance Manual
Brewery
Look under Resources and then Publications.
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Contact Info
Eric Rajaniemi, IPP Coordinator
Bedford Regional Water Authority
1723 Falling Creek Road
Bedford, VA 24523
E-mail: [email protected]
Phone: 540-586-7679, ext. 105