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298 94 307/02 Untersuchungen zum Stand der Umsetzung des ... 298 94 307/02 Untersuchungen zum Stand der Umsetzung des ...

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- thermal - catalytic • Biological separation - Bio-filter - Bio-purification 4.6.1 Bio-filter technique Description Teil 3 Seite 4-57 By means of the planned new plant, odour laden exhaust air from machines and proc- essing plants, as well as chamber air from operational chambers is to be captured and channelled into a biofilter via a pipeline system in order to reduce emissions. In total, 100.000 rn3/h of exhaust air is to be captured and treated. Achieved environmental benefits Cross media effects The water seeping through the filter bed is collected under the slatted floor and chan- nelled into the sewage system through a drain. Concrete details regarding the volumes involved are not possible. In any case, however, the volume of seepage water is exclu- sively dependent on the precipitation volume and is significantly lower than this. Operational data Applicability Economics operating time: 5000 h/a 1. energy consumption: 40 % part load) 2 exhaust fans each with 58 kW * 3.000 h/a * 0,065 €/kWh = 22.620 € 2 exhaust fans each with 23 kW * 2.000 h/a * 0,065 €/kWh = 5.980 € 2 circulating pump for the scrubber = 4875 € 2. Water consumption, condensate disposal pors. 60 % full load exhaust vapors: 0,28 t/t fish converting * 15 t fish / h makes 3,87 t/h exhaust va- 60 % into waste water treatment plant, 40 % evaporation = 2,32 t/h exhaust vapors 0,68 t/h washing wate summation= 33.475 € 3 t/h * 2,6 € (WWTP)/m³ summation=39.000€/a

Teil 3 Seite 4-58 3. Filtermaterial: exchange each 4 year summation= 14.000 €/a 4. Maintenanance summation=7.000 €/a 5. Cost of operation (summation Nr. 1 - Nr. 4) 93.475 €/a Driving force for implementation Example plants Example plant: Vereinigte Fischmehlwerke Cuxhafen GmbH & Co KG, Germany At this plant, exhaust air from the sectors: Boiling apparatuses Pre-sifting Presses Decanters Dryers Centrifuges Concentration plant is treated. Since the exhaust air still has a considerable heat content, the intention is to utilise a portion of this heat during the new pre-concentration. I.e. the exhaust air of the above processing plants is first channelled through a separate network into pre-concentration and only then into the biofilter. Immediately prior to the pneumatic conveyors, an air purifier is in each instance installed, through which all the exhaust air is intensively purified. The purifier is operated with water as the purification agent. The water is supplied in constant circulation. The losses on the basis of evaporation are compensated for through the addition of fresh water. In order to transport away separated fat or solid matter, the purifier can be operated with a constant overflow. The overflow volume must be set in accordance with actual requirements. Ex- perience shows that the effluent volume will be in the region of 0,5 to 1 m3/h. The con- tamination level is comparable with that of plant purification water. In accordance with the results of the dimensioning trials, the biofilter has a surface area of 800 m2. At a planned exhaust air level of 100.000 m3/h, the specific filter surface load will be 125 m3/h. This corresponds with the load of the biofilters that have been in use in comparable plants for many years and have sufficiently proven their effectiveness. The exhaust air is channelled into the chamber under the biofilter and then flows through the filter bed. The filter bed consists of a mixture of fibrous peat and heather. The dwell time of the exhaust air in the filter bed at a planned load of 125 m³/h and a filter bed height in a set state of 0,8 m is approx. 15 to 20 s. During this time, the organic odorants con-

- thermal<br />

- catalytic<br />

• Biological separation<br />

- Bio-filter<br />

- Bio-purification<br />

4.6.1 Bio-filter technique<br />

Description<br />

Teil 3 Seite 4-57<br />

By means of the planned new plant, odour laden exhaust air from machines and proc-<br />

essing plants, as well as chamber air from operational chambers is to be captured and<br />

channelled into a biofilter via a pipeline system in or<strong>der</strong> to reduce emissions. In total,<br />

100.000 rn3/h of exhaust air is to be captured and treated.<br />

Achieved environmental benefits<br />

Cross media effects<br />

The water seeping through the filter bed is collected un<strong>der</strong> the slatted floor and chan-<br />

nelled into the sewage system through a drain. Concrete details regarding the volumes<br />

involved are not possible. In any case, however, the volume of seepage water is exclu-<br />

sively dependent on the precipitation volume and is significantly lower than this.<br />

Operational data Applicability<br />

Economics<br />

operating time: 5000 h/a<br />

1. energy consumption:<br />

40 % part load)<br />

2 exhaust fans each with 58 kW * 3.000 h/a * 0,065 €/kWh = 22.620 €<br />

2 exhaust fans each with 23 kW * 2.000 h/a * 0,065 €/kWh = 5.980 €<br />

2 circulating pump for the scrubber = 4875 €<br />

2. Water consumption, condensate disposal<br />

pors.<br />

60 % full load<br />

exhaust vapors: 0,28 t/t fish converting * 15 t fish / h makes 3,87 t/h exhaust va-<br />

60 % into waste water treatment plant, 40 % evaporation =<br />

2,32 t/h exhaust vapors<br />

0,68 t/h washing wate<br />

summation= 33.475 €<br />

3 t/h * 2,6 € (WWTP)/m³ summation=39.000€/a

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