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Combined granular organo-mineral fertilisers with durable action were created. They consist of sewage sludge, ash residues, processing plant waste, humic substances. Obtained granular organomineral fertiliser enabled to enhance mineral nutrition, especially phosphoric, the main grain culture-winter wheat and corn.

The research deals with major environmental and social problem, dehydration of sewage sludge with the help of GeoTube technique elements. Dehydration process of sludge of different origin has been developed. A pilot installation has been designed and produced. This installation is realized as a filter module placed in the tank of Bortnichy's sewage treatment plant where the aerobically-stabilized sludge treated with flocculant Praestol 859 BS and water from filtration fields are delivered to. It can be used for reduction of workload on sludge fields, as well as for purification of supernatant water and dewatering of accumulated sludge.