The great success of the Dutch SMG in the fertilizer production

With the success story of Stichting Mestverwerking Gelderland Pieralisi flies to Hollland, where the mills are the protagonists and the lands are endless and uncontaminated.

We go back in time, precisely in the '70s when veal calf farms just discharged their manure onto the meadows. Brooks colored greener and greener, which of course was not a good sign. Therefore the Dutch Water Board took the initiative to construct a pilot processing plant.

Soon followed processing plants in Elspeet and Putten. In the early 90’s followed Ede and in 1994, SMG realized the plant in Stroe. While many initiatives in the field of manure stranded because of problems with permits and financing, the plant of SMG has proven to be profitable.

“The dry matter content of the calf manure has nearly doubled in the course of time from 1.8 to 3.5 percent. The result is that the processing of calf manure, over the years, became more and more difficult”, explains Wim van Omme. In 2015, as result, the capacity of the processing plant in Stroe was only capable to treat 160,000 tons calf manure. For 2017 it is expected that the new plant, completed in the last quarter of 2015, will process 190,000 tonnes. The capacity is even 210,000 for future expansion. Thereby providing KGBI Stroe a significant contribution in the treatment of manure surplus.

With this kind of processing SMG guarantees to individual veal calf farms, that they comply with this form of manure processing to the requirements of the Dutch government. A part of their manure is mandatory to be processed and needs to be exported. Nowhere else in the Netherlands there is a comparable process of pre-settling, dewatering and biological purification. It not only provides reusable products, but results also in a reduction in environmental impact. Wim van Omme: “The ammonia reduction amounts as much as 98 percent by converting ammonia into nitrogen gas. The water that remains after processing, we discharge into the sewer”.

The result is a wave of improvement and efficiency in terms of environmental sustainability and quality of fertilizer.

Today, taking into consideration that most of the processes are automated, the process runs continuously, and takes about two weeks before a re-usable end product is achieved. The supply takes place with tanker trucks, 100 load per week. The calf manure comes in the pre-settling tank which has a capacity of about 1.000 m3. The effluent decants at night and passes over into the slurry storage tank with a capacity of 4.000 m3. The same night, the settled fraction is pumped into the sediment tank. It is then dewatered by Pieralisi decanter centrifuge MAMMOTH 3.

This investment arrives following the need to improve the production process of the bovine fertilizer and thanks to the new machines they’ve been immediately able to produce the highest quality natural fertilizer. "In 1500 hours operation we experienced not one single incident”, plant manager Wim van Omme is pleased to note.

The Pieralisi Group, for its part, is satisfied and proud to be once again the protagonist of an excellent process of modernization and of a cutting-edge story of success.







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