MUNICIPAL SEWAGE SLUDGE AS A SECONDARY MATERIAL RESOURCE - WITH ESTIMATES OF POTENTIALLY USEFUL PRODUCTS AND SERVICES USING SLUDGE Статья Dolzhenok A.A., Kazhlaeva D.H., Suchkova I.A. GREEN-2022. Студенческие исследования в области экологии, инженерии и природы. 2022. С. 307-312