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15.11.2016  |  16647x
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Carbon – well-measured

and actively used for the environment and for consumption

Activated carbon is used in industrial and commercial cleaning processes due to its characteristic properties. It is used to remove and filter out unwanted substances from liquid and gaseous mix- tures. A precise feeding of the activated carbon is indispensable - both to properly control the cleaning process and to use the expensive raw material activated carbon (well over 1,500 € / t) in a cost-efficient manner.

Activated carbon in waste water treatment

With the increasing demands from environmental legislation, operators of waste water treatment plants need to add additional cleaning steps to the established waste water treatment process. They must ensure that substances which previously passed through the cleaning process are removed as fully as possible from the waste water.

The use of activated carbon allows such toxic materials or those which have poor biodegradability, to be removed from the waste water. To do this, activated carbon is added to the waste water as a cleaning step and, after the materials have been adsorbed, it is removed again. The contaminated activated carbon is then sent for thermal disposal along with the sewage sludge. The extended cleaning stage using powdered activated carbon is also known as the process of Ulm.

There are proven systems marketed under the AK-DOS® brand for safe storage, highly-accurate feeding and efficient suspension creation using powdered activated carbon. They have already been implemented in several large plant systems. Together with Sülzle Kopf Anlagenbau (Plant Technology │ Engineering and Construction), Gericke has developed a system with a high level of operational reliability. The AK-DOS® system offers you safe storage of powdered activated carbon with demand-controlled feeding and dispersion as well as system control. The tailored interaction of all the modules results in higher dosing accuracy. After the highly-accurate and secure feeding, the powdered activated charcoal is thoroughly wetted with water to create a suspension with a high elimination rate. When adding activated carbon, both the quantity of the activated carbon to the waste water volume and possibly the contamination level of the waste water with pollutants need to be taken into account. If the amount added is too low, there is an inadequate cleaning effect, overdosing should be avoided for economic reasons. Quick adjustment of the amount being added to cope with changing waste water volumes (e.g. when there is an increase during rainfall) with accurate feeding over a large performance range is therefore essential.

The figure shows a mechanical tare-compensated gravimetric feeding system using two Gericke DIW50 loss in weight feeders for waste water treatment. They continuously feed according to NAMUR 40 over a performance range of 2 to 40 kg/h, to generate an efficient suspension which is then mixed with the waste water flow in a contact basin. In the contact basin, the materials to be eliminated are adsorbed. Finally, the contaminated powdered activated carbon is drawn off with the sewage sludge or separated using a filter system. A hopper to refill the feeders is also included in the feeding plant. Refilling is done from a storage silo using a rotary valve and a reversible conveying screw to the hopper and from there into the feeders. The EasyDos Pro, which was developed by Gericke, is used to control the continuous feeding process.

Activated carbon in wine production

When producing wine, activated carbon is used as part of the fining process, along with other materials such as minerals or organic compounds. The fining is used to clarify the wine and for biochemical stabilisation. Any turbidity, discolouring and unwanted substances are removed from the wine. Activated carbon is particularly useful in removing undesired tastes and also for reducing coloured substances in white wine.

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