michael eumann euwa water treatment plants
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PUSHING THE LIMITS: DEVELOPMENT OF A NEW WATER TREATMENT PROCESS. 32 nd Convention Melbourne, Australia 2012 25 th – 30 th March Institute of Brewing & Distilling Asia Pacific Section. Michael Eumann EUWA Water Treatment Plants. Agenda. Different Water – Different Beer - PowerPoint PPT PresentationTRANSCRIPT
Michael EumannMichael EumannEUWA Water Treatment PlantsEUWA Water Treatment Plants
3232ndnd Convention ConventionMelbourne, Australia 2012Melbourne, Australia 2012
2525thth – 30 – 30thth March MarchInstitute of Brewing & DistillingInstitute of Brewing & Distilling
Asia Pacific SectionAsia Pacific Section
PUSHING THE LIMITS:
DEVELOPMENT OF A
NEW WATER TREATMENT PROCESS
Agenda
• Different Water – Different Beer
• Development of Water Treatment in Breweries
• Sustainability
• Conventional Lime Precipitation
• Modern Separation Technique: Ultrafiltration
• Combining Old and New
• Test Results
• Outlook
Different Water – Different Beer
Different raw water influenced the evolution of typical beer types in
different regions:
Pilzen in Czech Republic PILS
Burton-on-Trent in UK PALE ALE
Munich in Germany DARK BEERS
Vienna in Austria NO BEER, JUST WINE
Brew Water Treatment
Changes in ionic composition of brew water, primarily removal
of bicarbonates, was the aim already in the early days of
industrial brewing.
Today mainly three different major methods are used in
breweries for changing the ionic composition of the brew water:
From the oldest to the newest:
Lime precipitation (LP),
Ion exchange (IX) and
Reverse osmosis (RO).
Brew Water Treatment in the Historical Context
Mar
ket
Sha
re
Year
20001900 1950 19751925 2025
?Lime precipitation
Ionexchange
Reverseosmosis
Sustainability
WATER ENERGY CHEMICALS
Lime precipitation low low low - medium (Ca(OH)2)
Ion exchange medium low high (typically HCl)
Reverse osmosis high high low (antiscalant, acid)
Lime: Ca(OH)2
Lime (Ca(OH)2)
is a natural product,
is non-toxic.
CaCO3 from lime
precipitation can be easily
used in other industries or
even be recycled.Limestone quarray near Orosei, Sardinia
(picture by Michael J. Zirbes; taken from www.de.wikipedia.org)
Pamukkale, Turkey
(picture by Mila Zinkova; taken from www.de.wikipedia.org)
Conventional Lime Precipitation
Addition of lime (Ca(OH)2):
• Main reaction:
Ca2+ + 2 HCO3- + Ca2+ + 2 OH- 2 CaCO3 + 2 H2O
• Mg(HCO3)2 can only be removed as Mg(OH)2, which requires higher pH-values two-stage lime precipitation (system Morgenstern).
Since 1965
ONE-STAGE LIME PRECIPITATIONONE-STAGE LIME PRECIPITATION
Raw waterLime milk Reactor 1
Lime water
Sand filter
Brew water
Since 1965
Mg(HCO3)2+ 2Ca(OH)2 => 2CaCO3 + Mg(OH)2 + 2H2O
TWO-STAGE LIME PRECIPITATIONTWO-STAGE LIME PRECIPITATION
Conventional Lime Precipitation• Large footprint due to:
• Lime saturators • Reactor(s).
Large Footprint
Lime saturators:•Solution of lime:
• short time.•Separation of undissolved from dissolved matter by sedimentation:
• long time large footprint.
Lime precipitation reactors:•Reaction of lime with bicarbonates:
• short time (within minutes).•Separation of undissolved from dissolved matter by sedimentation:
• long time large footprint.
Modern Separation Technique: Ultrafiltration
Ensures filtrate is free of particles, turbidity even underfluctuating flow conditions.
Takes out bacteria and viruses.
Ideal for surface water(e.g. river, lake) or aspretreatment for RO.
Combining Old and New: Lime Water Preparation
Water source
Lime milkSaturatedLime Water
Membrane filtration system
Lime WaterStorage
Combining Old and New: Lime Water Preparation
Replaces lime saturators.
Small footprint.
Provides clear and saturated lime water of constant quality.
Combining Old and New: Lime Precipitation
Combining Old and New: Lime Precipitation
Replaces reactor(s).
Small footprint.
Provides clear, dealkalized brew water of constant quality.
Test Results: Water Quality(exemplarily for six months trial period)
WATER
Raw water ExistingConventional
Lime precipitation x1
New membrane based lime
precipitation
Total hardness(ppm CaCO3)
163 - 179 88 89
m-Alkalinity(ppm CaCO3)
125 – 135 45 35 – 40
p-Alkalinity(ppm CaCO3)
- 5 +/- 0 15
pH ( ) 7.89 – 8.16 8.77 9.5
Conductivity (µS/cm) 337 - 339 190 200
X1: Two-stage lime precipitation plant; effluent values fluctuating.
Test Results: Backwashing
• Focus was put on hydraulics and backwash regime, resulting in
• Cross-flow operation,
• Optimization of the lime precipitation reaction,
• Regular backwashing using air and water
• Backwash water recovery by simple reinjection, resulting in < 1 % of water losses.
Comparing Footprint and Cost
Capacity 5m3/h
Conventional Membrane
Footprint (LxWxH) 8m x 2.5m x 5m 4m x 2m x 2m
Cost 80,000€ 30,000€
Application
• Revival of a well-known, sustainable technology by restoring its competetiveness.
• Combination with reverse osmosis:• As pretreatment for maximising the yield (up to 95 %).• For concentrate recovery.
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