[Claims of machine decontamination of dishes under hygienic conditions and of a small load in sewage--a contradiction?].
To make sure, whether the hygienic requirements and the ecotoxicologic ones are excluding each other or not, several studies in dishwashing machines under practical conditions have been done. The requirements from the hygienic point of view have been fixed at a 5 lg--reduction of E. faecium ATCC 6057 in a mixture of bovine albumin, mucin and starch as interfering substances on well defined test items. The temperatures in the machine have been increased from around 50 degrees C to 60 degrees C-63 degrees C and a separate precleaning zone has been installed. Under these conditions a cleaner without any available chlorine could be used and that in a lower concentration as before. Furthermore a significant reduction in the parameter AOX and an improvement of the data H 17 and COD could be achieved at the waste water outlet of the machine and at the waste pipe of the whole kitchen without any reduction of the hygienic demands.
Harpel
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S
Hygiene Institut, Klinikum der Justus Liebig Universität Giessen.
Tilkes
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F
Krüger
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S
D015169:Colony Count, Microbial; D003297:Cooking and Eating Utensils; D004203:Disinfection; D016984:Enterococcus faecium / Q000254:growth & development*; D006358:Hot Temperature; D014871:Water Microbiology
Forderungen an die maschinelle Dekontamination von Geschirr unter hygienischen Gesichtspunkten sowie an eine geringe Belastung der Abwässer--ein Widerspruch?