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Teil 3 Seite 4-25 sewage from slaughterhouse plants with sifting installations with a mesh size of 1 mm in terms of BSB5 represent a reduction of between 17 and 49%. However, if all above men- tioned internal measures are taken, and assuming efficient running of the plant in other respects, these values will be significantly lower. It is advisable to determine degrees of efficiency beforehand on the basis of semi-commercial trials. Screenings emanating from the red line should be ceded to an animal carcass disposal plant. The screenings emanating from the green line can possibly be utilised or composted ag- riculturally after they have been disinfected. Achieved environmental benefits Cross media effects Operational data Applicability Economics Driving force for implementation Example plants Corporate clarification plant of the Duringer Fleischkontor (During meat branch office), Germany Anaerobic waste treatment of the NFZ pork slaughterhouse in Emstek, District of Clop- penburg, Germany Pre-treatment slaughterhouse, North-Rhine Westphalia, waste water pre-treatment plant slaughterhouse, Saxony Anhalt, Germany Oberding animal carcass disposal plant, Germany Corporate clarification plant of the Kraftisried animal carcass disposal plant, 87647 Unterthingau Reference literature ATV-Handbuch Industrieabwasser (Lebensmittelindustrie) 4.5.2 Chemical/physical treatment Reference to actual BREF - Use of H2O2 to remove H2S from waste water in feather rendering plants (4.3.1.4- p.253)

Teil 3 Seite 4-26 4.5.2.1 Ammoniacal-N removal from rendering condensate by ammonia conversion Description An alternative method of reducing ammonia nitrogen in the water vapour from rendering processes is ammonia conversion. In contrast to stripping, the gaseous ammonia con- tained in vapours is already removed during this process. The ammonia, along with the vapours in this process is channelled into a washing column (converter) with a counter- flow stream of a slightly acidic nitrous acid solution, where the ammonia is converted into ammonium with nitrate as counter ion. The converter consists of a packed column, through which the slightly acidic ammonium nitrate solution is pumped into circulation (Figure 4-5). The ammonium nitrate is removed from the sump of the packed column upon reaching the desired concentration of 50 to 60%. The vapours freed from the ammonia are subsequently, as usual, condensed into now acidic vapour condensates in a con- denser. Currently, only vapours emanating from drying are channelled through the plant. A future conversion plant for cooker vapours is also planned. Acid Exhaust vapours Ammonium nitrate Ammonia con- verter Condenser Anaerobic reactor Aerobic after treatment Liquid phase Gas phase Figure 4-5: Diagram of ammonia conversion at the Brögbern animal carcass disposal plant Through the addition of a specific quantity of urea, a urea ammonium nitrate solution of 28% (UAN-28) can be produced from the ammonium nitrate solution obtained in this way, which can be utilised as a nitrogen rich agricultural fertiliser. It is also feasible to accom- modate the ammonium nitrate in industrial clarification plants for the purpose of nutrient amelioration. It is important during the operation of a converter of this type that the vapours do not contain any entrained solid matter. Appropriate cyclones and other suitable separation devices must therefore be installed preceding the converter. The vapours should, in addi-

Teil 3 Seite 4-25<br />

sewage from slaughterhouse plants with sifting installations with a mesh size of 1 mm in<br />

terms of BSB5 represent a reduction of between 17 and 49%. However, if all above men-<br />

tioned internal measures are taken, and assuming efficient running of the plant in other<br />

respects, these values will be significantly lower. It is advisable to determine degrees of<br />

efficiency beforehand on the basis of semi-commercial trials.<br />

Screenings emanating from the red line should be ceded to an animal carcass disposal<br />

plant.<br />

The screenings emanating from the green line can possibly be utilised or composted ag-<br />

riculturally after they have been disinfected.<br />

Achieved environmental benefits<br />

Cross media effects<br />

Operational data Applicability<br />

Economics<br />

Driving force for implementation<br />

Example plants<br />

Corporate clarification plant of the Duringer Fleischkontor (During meat branch office),<br />

Germany<br />

Anaerobic waste treatment of the NFZ pork slaughterhouse in Emstek, District of Clop-<br />

penburg, Germany<br />

Pre-treatment slaughterhouse, North-Rhine Westphalia, waste water pre-treatment plant<br />

slaughterhouse, Saxony Anhalt, Germany<br />

Oberding animal carcass disposal plant, Germany<br />

Corporate clarification plant of the Kraftisried animal carcass disposal plant, 87647<br />

Unterthingau<br />

Reference literature<br />

ATV-Handbuch Industrieabwasser (Lebensmittelindustrie)<br />

4.5.2 Chemical/physical treatment<br />

Reference to actual BREF<br />

- Use of H2O2 to remove H2S from waste water in feather ren<strong>der</strong>ing plants<br />

(4.3.1.4- p.253)

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