Every year, hundreds of thousands of tons of wet sewage sludge are produced worldwide, containing a number of recyclable substances, including phosphorus in large quantities. In Switzerland e.g. the phosphorus contained in the effluents is equivalent to approximately the same amount of phosphorus imported annually in the form of fertilizer.
At the same time, there is currently an intensive exploitation of the natural resources of phosphorus in countries such as China, Morocco, USA and Russia, so that these resources will no longer be infinitely and indefinitely available. This situation suggests a recycling of recyclables in sewage sludge, and in particular of phosphorus. The sewage sludge is usually about 96% water and about 4% of dry matter. Therefore, a drying of sewage sludge is necessary.
The Swiss company KAWE AG, based in Untersiggenthal, manufactures and supplies belt dryers of various sizes, with the aid of which the sewage sludge is dried in various processes before its further processing, thereby considerably reducing its volume and weight.
Kawe builds both standard systems in common sizes such as ED12, ED24 or ED51 as well as customer-specific systems which are tailored in detail to the operational customer conditions (waste heat utilization, sewage sludge quantities, sewage sludge type, multi-level processes, etc.).
The belt dryers from KAWE AG (System Easy Dry) have the following main features and advantages: