June 14, 2016

BHS-Sonthofen delivers the largest indexing belt filter in the company’s history

Final assembly of the indexing belt filter in early 2016 During final assembly of the BF 350-255 in early 2016 During final assembly of the BF 350-255 in early 2016

The BHS Indexing Belt Filter of type BF 350-255 during final assembly in the Sonthofen plant at the beginning of 2016. Final assembly of the indexing belt filter of type BF 350-255 in early 2016 Final assembly of the indexing belt filter of type BF 350-255 in early 2016

BHS-Sonthofen has received the order from an American customer to supply an indexing belt filter for extracting reusable substances from fibrous plant waste. The new filtration plant of type BF 350-255 is not only the biggest that BHS has ever built, with a filter area of just under 90 m², but it also has the highest capacity of its kind in the world.

The indexing belt filter of type BF 350-255 will process up to 5,000 kg of fibrous plant waste hourly, extracting recoverable liquid components generated in a previous production process. The filtrate is utilized for the manufacture of basic chemicals, while the remaining solids, which could not previously be used, are reprocessed.

During project planning, the customer had initially envisaged a multistage process with a sequence of consecutive screening and filtration steps and with the solids being resuspended several times. The proposal from BHS-Sonthofen to use an indexing belt filter of type BF with a single process step convinced the customer, however. Not only is the process much simpler, but it also concentrates the reusable substances to a greater extent. This means that less energy is required for extracting the substances at a later stage in the process.

The plant waste is first suspended in water as part of the treatment process. BHS implemented a multistage counter-current wash process in the filter plant to ensure that the reusable substances dissolved in this can be extracted as effectively from the solid as possible. This allows the filter to achieve an excellent washout quality, thereby significantly increasing the concentration of the dissolved reusable product in the liquid. The BHS indexing belt filter of type BF 350-255 extracts approximately ten percent more recoverable materials than conventional procedures.

Moreover, operating costs are lower because the indexing belt filter requires about 30 percent less water than the multistage process. This also results in considerably lower investment costs, because no multiple stirring tank and filter cascades are required. As the entire filter plant is much simpler in design than conventional plants, it ensures a high operational reliability. At the same time, maintenance costs are significantly lower in comparison to conventional plants.

BHS supplied the filter plant in the spring of 2016 after having been awarded the contract in late 2015. Commissioning is planned for the fall of 2016.

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