Dust as a contamination source in the feed industry

Helena Tuompo, Satu Salo, Gun Wirtanen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Undesirable microbial contamination is the most significant factor that compromises feed product quality and safety. The number of infectious feedborne pathogens, e.g. Salmonella spp., may be only a few cells per gram or millilitre, whereas feed spoilage moulds usually need to reach populations of a million or more cells per gram to have an adverse effect on the sensory and physical attributes of the feed. Almost all ingredients containing enough bacteria may present problems for final feed without adequate process control. This was not investigated in the present case study. All mixing processes and feed material transfers result in dust formation, and dust residues accumulate on manufacturing equipment surfaces, floor drains, conveyors and even outside the factory. Dust can act as continuous culture systems, in which micro-organisms reside and may begin to multiply under beneficial conditions. The risks of dust as a microbial reservoir were investigated here. Known strains of bacteria, Escherichia coli, Salmonella agona, Enterobacter cloacae, Bacillus cereus and Staphylococcus warneri were introduced onto clean stainless-steel surfaces representing industrial manufacturing equipment surfaces. Part of the surfaces were also soiled with various amounts of powder samples of raw materials: barley flour, soy and rapeseed extracts, meat and bone meal, and ready-made compound feed, all serving as experimental dust residues. The soiled surfaces were then kept dry at room temperature. Survival of the bacteria was assessed every second day. All bacteria on clean stainless-steel surfaces died in one week, but bacteria survived for weeks on surfaces soiled with the various powders used. The decrease in viability was constant during the follow-up study. If the surfaces were wetted, all bacteria began to grow, the growth being dependent on the nature and amount of raw material or compound feed on the surface.
Original languageEnglish
Title of host publication30th R3-Nordic Contamination Control Symposium
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages121-128
ISBN (Print)951-38-5268-7
Publication statusPublished - 1999
MoE publication typeA4 Article in a conference publication
Event30th R3-Nordic Contamination Control Symposium
- Helsinki, Finland
Duration: 30 May 19992 Jun 1999

Publication series

SeriesVTT Symposium
Number193
ISSN0357-9387

Conference

Conference30th R3-Nordic Contamination Control Symposium
CountryFinland
CityHelsinki
Period30/05/992/06/99

Fingerprint

feed industry
dust
bacteria
stainless steel
raw materials
powders
manufacturing
Staphylococcus warneri
Salmonella Agona
conveyors
barley flour
Enterobacter cloacae
meat and bone meal
product safety
microbial contamination
process control
Bacillus cereus
rapeseed
factories
spoilage

Cite this

Tuompo, H., Salo, S., & Wirtanen, G. (1999). Dust as a contamination source in the feed industry. In 30th R3-Nordic Contamination Control Symposium (pp. 121-128). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 193
Tuompo, Helena ; Salo, Satu ; Wirtanen, Gun. / Dust as a contamination source in the feed industry. 30th R3-Nordic Contamination Control Symposium. Espoo : VTT Technical Research Centre of Finland, 1999. pp. 121-128 (VTT Symposium; No. 193).
@inproceedings{82e6deadebc843c1bc617f6434d6538e,
title = "Dust as a contamination source in the feed industry",
abstract = "Undesirable microbial contamination is the most significant factor that compromises feed product quality and safety. The number of infectious feedborne pathogens, e.g. Salmonella spp., may be only a few cells per gram or millilitre, whereas feed spoilage moulds usually need to reach populations of a million or more cells per gram to have an adverse effect on the sensory and physical attributes of the feed. Almost all ingredients containing enough bacteria may present problems for final feed without adequate process control. This was not investigated in the present case study. All mixing processes and feed material transfers result in dust formation, and dust residues accumulate on manufacturing equipment surfaces, floor drains, conveyors and even outside the factory. Dust can act as continuous culture systems, in which micro-organisms reside and may begin to multiply under beneficial conditions. The risks of dust as a microbial reservoir were investigated here. Known strains of bacteria, Escherichia coli, Salmonella agona, Enterobacter cloacae, Bacillus cereus and Staphylococcus warneri were introduced onto clean stainless-steel surfaces representing industrial manufacturing equipment surfaces. Part of the surfaces were also soiled with various amounts of powder samples of raw materials: barley flour, soy and rapeseed extracts, meat and bone meal, and ready-made compound feed, all serving as experimental dust residues. The soiled surfaces were then kept dry at room temperature. Survival of the bacteria was assessed every second day. All bacteria on clean stainless-steel surfaces died in one week, but bacteria survived for weeks on surfaces soiled with the various powders used. The decrease in viability was constant during the follow-up study. If the surfaces were wetted, all bacteria began to grow, the growth being dependent on the nature and amount of raw material or compound feed on the surface.",
author = "Helena Tuompo and Satu Salo and Gun Wirtanen",
year = "1999",
language = "English",
isbn = "951-38-5268-7",
series = "VTT Symposium",
publisher = "VTT Technical Research Centre of Finland",
number = "193",
pages = "121--128",
booktitle = "30th R3-Nordic Contamination Control Symposium",
address = "Finland",

}

Tuompo, H, Salo, S & Wirtanen, G 1999, Dust as a contamination source in the feed industry. in 30th R3-Nordic Contamination Control Symposium. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 193, pp. 121-128, 30th R3-Nordic Contamination Control Symposium
, Helsinki, Finland, 30/05/99.

Dust as a contamination source in the feed industry. / Tuompo, Helena; Salo, Satu; Wirtanen, Gun.

30th R3-Nordic Contamination Control Symposium. Espoo : VTT Technical Research Centre of Finland, 1999. p. 121-128 (VTT Symposium; No. 193).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Dust as a contamination source in the feed industry

AU - Tuompo, Helena

AU - Salo, Satu

AU - Wirtanen, Gun

PY - 1999

Y1 - 1999

N2 - Undesirable microbial contamination is the most significant factor that compromises feed product quality and safety. The number of infectious feedborne pathogens, e.g. Salmonella spp., may be only a few cells per gram or millilitre, whereas feed spoilage moulds usually need to reach populations of a million or more cells per gram to have an adverse effect on the sensory and physical attributes of the feed. Almost all ingredients containing enough bacteria may present problems for final feed without adequate process control. This was not investigated in the present case study. All mixing processes and feed material transfers result in dust formation, and dust residues accumulate on manufacturing equipment surfaces, floor drains, conveyors and even outside the factory. Dust can act as continuous culture systems, in which micro-organisms reside and may begin to multiply under beneficial conditions. The risks of dust as a microbial reservoir were investigated here. Known strains of bacteria, Escherichia coli, Salmonella agona, Enterobacter cloacae, Bacillus cereus and Staphylococcus warneri were introduced onto clean stainless-steel surfaces representing industrial manufacturing equipment surfaces. Part of the surfaces were also soiled with various amounts of powder samples of raw materials: barley flour, soy and rapeseed extracts, meat and bone meal, and ready-made compound feed, all serving as experimental dust residues. The soiled surfaces were then kept dry at room temperature. Survival of the bacteria was assessed every second day. All bacteria on clean stainless-steel surfaces died in one week, but bacteria survived for weeks on surfaces soiled with the various powders used. The decrease in viability was constant during the follow-up study. If the surfaces were wetted, all bacteria began to grow, the growth being dependent on the nature and amount of raw material or compound feed on the surface.

AB - Undesirable microbial contamination is the most significant factor that compromises feed product quality and safety. The number of infectious feedborne pathogens, e.g. Salmonella spp., may be only a few cells per gram or millilitre, whereas feed spoilage moulds usually need to reach populations of a million or more cells per gram to have an adverse effect on the sensory and physical attributes of the feed. Almost all ingredients containing enough bacteria may present problems for final feed without adequate process control. This was not investigated in the present case study. All mixing processes and feed material transfers result in dust formation, and dust residues accumulate on manufacturing equipment surfaces, floor drains, conveyors and even outside the factory. Dust can act as continuous culture systems, in which micro-organisms reside and may begin to multiply under beneficial conditions. The risks of dust as a microbial reservoir were investigated here. Known strains of bacteria, Escherichia coli, Salmonella agona, Enterobacter cloacae, Bacillus cereus and Staphylococcus warneri were introduced onto clean stainless-steel surfaces representing industrial manufacturing equipment surfaces. Part of the surfaces were also soiled with various amounts of powder samples of raw materials: barley flour, soy and rapeseed extracts, meat and bone meal, and ready-made compound feed, all serving as experimental dust residues. The soiled surfaces were then kept dry at room temperature. Survival of the bacteria was assessed every second day. All bacteria on clean stainless-steel surfaces died in one week, but bacteria survived for weeks on surfaces soiled with the various powders used. The decrease in viability was constant during the follow-up study. If the surfaces were wetted, all bacteria began to grow, the growth being dependent on the nature and amount of raw material or compound feed on the surface.

M3 - Conference article in proceedings

SN - 951-38-5268-7

T3 - VTT Symposium

SP - 121

EP - 128

BT - 30th R3-Nordic Contamination Control Symposium

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Tuompo H, Salo S, Wirtanen G. Dust as a contamination source in the feed industry. In 30th R3-Nordic Contamination Control Symposium. Espoo: VTT Technical Research Centre of Finland. 1999. p. 121-128. (VTT Symposium; No. 193).