Pathogenic bacteria in feed meal are a major risk factor for animal health and performance. Thermal meal treatment significantly reduces microorganisms in feed, but requires a subsequent cooler after the hygienising section. Difficult to clean, conventional meal coolers can be a potential source for cross- and re-contamination.

1. Digital Re-print - November | December 2010
New dimension in the production of hygienised feed meal
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2. Feed meal Feature Feature Feed meal
meal coolers are often described as a ‘five
star hotel’ for microorganisms: The handling
of hot and moist feed meal can cause con-
densation in the meal cooler, with free water
being a major growth factor for bacteria
which has resist the hygienising process or
airborne bacteria from the high air volumes
applied.
Furthermore, cross- and re-contamina-
tion can occur due to product residues in
the system, which are difficult to remove and
require tremendous cleaning effort.
Thermal meal treatment
The Buhler Group has developed a new
process solution utilising thermopneumatic of steam. The heated formulated feed is feed enters the Triple Air Control (TAC)
conveying for drying and cooling of hygien- then retained in one or optionally two system for drying and cooling. In the first
ised feed meal. The thermal meal treatment HYTHERM modules. stage, pre-heated air is applied for drying and
process is divided into the sub-processes of This allows retention times between 60 cooling, utilising the effect of evaporation.
hygienising and thermopneumatic drying/ and 240 seconds to be achieved as a func- Final product temperature is achieved in
cooling. tion of the throughput rate. In addition, the the subsequent two pneumatic conveying
Hygienising is carried out by the HYMIX HYTHERM system is characterised by its lines, utilizing ambient air for cooling.
and HYTHERM modules. very narrow dwell time distribution, thus get- The optimised concept of HYMIX and
In the HYMIX, the compound feed ting very close to the ‘first in – first out’ prin- Hytherm ensures low product residues and
particles can be heated to a temperature ciple, which ensures reliable hygienisation. easy cleaning.
of 80 to 90 degrees C by the addition In a second process step, the hygienised Thanks to the high air velocities applied,
New dimension in the Mog2011 GFM01 Compacting 132x90:132x90 Ad 17/11/2010 17:35 Page 1
production of hygienised Processing
& recycling…
feed meal by Stefan Hoh, Buhler Group, Switzerland SIZING
P
athogenic bacteria in feed meal and the season. Whereas, most of the Hence, a hygienising temperature of
are a major risk factor for animal microorganisms are harmless, some species about 85°C has become common practice
SEPARATING
health and performance. like enterobacteriaceae show pathogenic in the feed industry to ensure that virtually
potential, with salmonella being the most all pathogenic bacteria are destroyed. The
Thermal meal treatment significantly common subspecies of enterobacteriaceae temperature is achieved by the addition of
reduces microorganisms in feed, but requires in animal feed. steam into the conditioner and retained For all
CONVEYING
a subsequent cooler after the hygienising Infection doses for salmonella are com- for a certain dwell time in the subsequent your COMPACTING
section. Difficult to clean, conventional meal paratively low, with an incubation period of a retentioner to guarantee a reliable decon- and other vibratory
coolers can be a potential source for cross- few hours to two days, depending on animal tamination process.
and re-contamination. species and age.
equipment needs –
A new process solution has been devel- Salmonella can cause serious animal dis- Recontamination after whether you’re
oped by Buhler Group, Switzerland, utilizing ease like diarrhea, reducing feed digestibility hygienising specifying, purchasing SPREADING
thermopneumatic conveying for drying and and conversion, impairing animal growth and After the hygienising process, the hot or installing – make sure
cooling as a smart alternative to meal coolers. performance. and moist feed has to be cooled and dried
to prevent recontamination and growth of
it’s a MOGENSEN!
Contaminated raw materials Hygienising by heat treatment microorganisms.
Agricultural products are a natural source Sensitive to heat, salmonella are usually This usually takes place in conventional SCREENING
Harlaxton Road, Grantham
of microorganisms such as bacteria, yeasts killed at temperatures above 55°C. meal coolers utilizing the principle of fluid Lincolnshire NG31 7SF, England
and molds. However, high concentrations of fat, pro- bed cooling. Ambient air enters the cooler at Tel: +44 (0)1476 566301
The degree of contamination is subject tein or starch in formulated feed may form a the bottom side, flows through the perfora- Fax: +44 (0)1476 590145
E-mail: sales@mogensen.co.uk
to parameters such as type of raw mate- protective colloid layer and thus increase the tion and fluidizes the meal.
rial, origin, transport and storage conditions heat resistance of bacteria. Even though providing efficient cooling, www.mogensen.co.uk FEEDING
14 | november - december 2010 Grain &feed millinG technoloGy Grain &feed millinG technoloGy november - december 2010 | 15

3. be utilised in the best possible way. Improved feed feed trough.
The system was installed at the Amrein The pig feed produced by the new Last, the heat and steam treatment causes
Futtermühle AG, Switzerland, which pro-
duces hygienised swine feed.
process is characterized by its extremely low
count of microorganisms such as bacteria,
fines to Feed meal coarser eature
agglomerate on F particles,
which reduces dust generation and improves
Operation of the new facility is fully molds, and yeast fungi. flowability. Choke-ups during discharge from
automated and is controlled exclusively Pathogenic bacteria such as salmonella storage bins and silos are greatly reduced
from the control room. This cuts labour are virtually destroyed, which significantly compared to untreated feed meal.
costs TAC allows just-in-time production.
the and system is self-cleaning, which pre- reduces or adjusted to and severity of diar-
needs the incidence feed recipes for other ability of the feed. Thermally treated swine
The new process increases the by a ther-
vents product deposits. Cooling uptime rhea disorders in e.g. layer and breeder feed.
animal species, the animals. feed may thus have a positive influence on
ofmopneumatic conveyor greatly reduces the
the processing lines thanks to reduced Besidesis made possible by the following
This improving the animals’ health, this the animal’s appetite and – according to
downtimes when formulationsand recontami-
risk of cross-contamination are changed also enhances feed digestibility, which in turn
options: microfiltration of the air for top More inforMation:
feedback Amrein received from its custom-
in nation in comparisonhygienising systems
comparison with to conventional meal has a positive impact onaddition of increase
sanitation standards; the weight solid and ers – results in outstanding feed acceptance.
Buhler Group
consisting of pellet mills and conventional
coolers. ofliquidanimals.
the microingredients; post-mixing applica- Moreover, thermal meal treatment
Uzwil, CH-9240 SWITZERLAND
meal Thanks to its flexible design, the new
coolers. The Maillard reaction occurring during the
tion for unsurpassed product homogeneity; improves www.buhlergroup.com
Website: the water solubility of the
The new thermal meal treatment system
thermal meal treatment system has a small thermal treatment of the steam quality and/or
and monitoring process creates a bundle feed. Product lumps in the feed slurry
can be easilyfootprint. This enables the space
installation tailored to specific customer ofof the moisture content.
roast flavours, which improve the palat- are effectively prevented, as well as
available in existing feed production plants to deposits of high-density particles in the
be utilised in the best possible way. Improved feed feed trough.
The system was installed at the Amrein The pig feed produced by the new Last, the heat and steam treatment causes
Futtermühle AG, Switzerland, which pro- process is characterized by its extremely low fines to agglomerate on coarser particles,
duces hygienised swine feed. count of microorganisms such as bacteria, which reduces dust generation and improves
Operation of the new facility is fully molds, and yeast fungi. flowability. Choke-ups during discharge from
automated and is controlled exclusively Pathogenic bacteria such as salmonella storage bins and silos are greatly reduced
from the control room. This cuts labour are virtually destroyed, which significantly compared to untreated feed meal.
VIVAsia 2011
costs and allows just-in-time production. reduces the incidence and severity of diar-
The new process increases the uptime rhea disorders in the animals.
of the processing lines thanks to reduced Besides improving the animals’ health, this
downtimes when formulations are changed also enhances feed digestibility, which in turn
More inforMation:
in comparison with hygienising systems has a positive impact on the weight increase
Buhler Group
March 9 - 11, 2011
consisting of pellet mills and conventional
meal coolers.
of the animals.
The Maillard reaction occurring during the
Uzwil, CH-9240 SWITZERLAND
Website: www.buhlergroup.com
The new thermal meal treatment system thermal treatment process creates a bundle
Bangkok
can be easily tailored to specific customer of roast flavours, which improve the palat-
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16 | november - december Grain &feed millinG technoloGy

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