Integrierte Vermeidung und Verminderung der Umweltverschmutzung
Integrierte Vermeidung und Verminderung der Umweltverschmutzung Integrierte Vermeidung und Verminderung der Umweltverschmutzung
Chapter 2 To recover fat from meat residues, wet melting or dry melting is used. In the wet melting process, the raw material is heated in a process kettle by direct steam injection to a temperature of about 90 °C. This results in a watery phase and a fat containing phase. The phases are separated by decantation and centrifugation. In the dry melting process, the raw material is indirectly heated in the processing kettle (a kettle with a steam jacket). All the water which evaporates is removed from the kettle under vacuum. The liquid phase or molten fat and the dry phase or fat-free meat residue are separated by decantation. The meat sector is very diverse in terms of its products due to specific local tastes and traditions. However, three processes commonly used are canned meat, cooked ham, and cured ham production. 2.2.1.1 Canned meat (beef muscle in gelatine) Different raw materials, such as cooked or uncooked, chilled or frozen meat may be used to produce canned meat. A general flow sheet is presented in Figure 2.3. Cans H1 Alternative 1 Frozen cooked meats Thawing Cutting Meat dosing Weight control Cooking (de-aeration) Sealing Can washing Thermal treatment Cooling Storage finished products Figure 2.3: Canned meat production [91, Italian contribution, 2001] 2.2.1.1.1 Thawing (A.5) Alternative 2 Frozen uncooked meats Meat Thawing Trimming Pre-cooking Cutting Canned meat Gelatine preparation Mixing Cooking Frozen meat is generally transported in plastic bags inside a cardboard secondary packaging. Meat is stored at a temperature below -18 ºC. Thawing can be achieved with air at a controlled temperature, or by an intermittent shower, or by immersion into running water. The two first methods allow a reduction in water consumption, but require longer times and larger surface areas. Moreover, the meat surface may be dried and its unsaturated fats, e.g. in pork, may be oxidised. When thawing in a water bath, the unpacked meat is put in iron crates and completely immersed in water at 15 to 18 ºC. The water consumption is about 3 – 5 m 3 /t. 62 January 2006 RHC/EIPPCB/FDM_BREF_FINAL Soup Tank Filling
2.2.1.1.2 Cutting (B.1) Chapter 2 Fresh meat is trimmed to remove excess fat and may be deboned. About 12 % of by-products are produced in this step. 2.2.1.1.3 Mixing/blending (B.2) Gelatine is prepared from industrial powder. It may come from the broth obtained during meat cooking if uncooked raw meat is used in the installation. Cooking one part of meat with one part of water gives 0.7 parts of cooked meat and 1.3 parts of broth. The broth is then filtered, boiled until the insoluble proteins precipitate, centrifuged, and filtered again. Finally, about one part of gelatine is produced. Ingredients, such as thickeners and flavours are added to the gelatine solution. 2.2.1.1.4 Packing and filling (H.1) The gelatine is de-aerated and dosed in cans by a vacuum filler already containing the required part of meat. The cans are then sealed and washed with hot water to remove meat or gelatine residuals. 2.2.1.1.5 Sterilisation (E.8) Cans are put in metal baskets and then sterilised in autoclaves, either in batch or continuous retorts, before being cooled. 2.2.1.1.6 Secondary packaging (H.1) The cooled and dried cans are sent to be secondary packaged using cardboard boxes or bundles with a cardboard base and having a thermo-retractable wrap. 2.2.1.1.7 Refrigeration (U.5) The product has a long shelf-life and does not need special care, apart from a good aeration to avoid condensation on the cans which may damage their external surfaces. 2.2.1.2 Cooked ham The preservation of meat by cooking is used for several products, such as sausages, dressed pork and mortadella. The general process is shown in Figure 2.4. RHC/EIPPCB/FDM_BREF_FINAL January 2006 63
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2.2.1.1.2 Cutting (B.1)<br />
Chapter 2<br />
Fresh meat is trimmed to remove excess fat and may be deboned. About 12 % of by-products<br />
are produced in this step.<br />
2.2.1.1.3 Mixing/blending (B.2)<br />
Gelatine is prepared from industrial pow<strong>der</strong>. It may come from the broth obtained during meat<br />
cooking if uncooked raw meat is used in the installation. Cooking one part of meat with one part<br />
of water gives 0.7 parts of cooked meat and 1.3 parts of broth. The broth is then filtered, boiled<br />
until the insoluble proteins precipitate, centrifuged, and filtered again. Finally, about one part of<br />
gelatine is produced. Ingredients, such as thickeners and flavours are added to the gelatine<br />
solution.<br />
2.2.1.1.4 Packing and filling (H.1)<br />
The gelatine is de-aerated and dosed in cans by a vacuum filler already containing the required<br />
part of meat. The cans are then sealed and washed with hot water to remove meat or gelatine<br />
residuals.<br />
2.2.1.1.5 Sterilisation (E.8)<br />
Cans are put in metal baskets and then sterilised in autoclaves, either in batch or continuous<br />
retorts, before being cooled.<br />
2.2.1.1.6 Secondary packaging (H.1)<br />
The cooled and dried cans are sent to be secondary packaged using cardboard boxes or b<strong>und</strong>les<br />
with a cardboard base and having a thermo-retractable wrap.<br />
2.2.1.1.7 Refrigeration (U.5)<br />
The product has a long shelf-life and does not need special care, apart from a good aeration to<br />
avoid condensation on the cans which may damage their external surfaces.<br />
2.2.1.2 Cooked ham<br />
The preservation of meat by cooking is used for several products, such as sausages, dressed<br />
pork and mortadella. The general process is shown in Figure 2.4.<br />
RHC/EIPPCB/FDM_BREF_FINAL January 2006 63