V.I. Smetanin - Dr. Sc. (Eng.), Professor, Head of Department, Institute of environmental engineering named after A.N. Kostyakov (Moscow). E-mail: smetanin@ yandex..ru A.N. Nasonov - Ph. D. (Eng.), Associate Professor, Institute of environmental engineering named after A.N. Kostyakov (Moscow). E-mail: adn22@yandex.ru I.V. Tsvetkov - Dr. Sc. (Eng.), Professor, Tver State University. E-mail: mamcu@ maii.ru V.P. Tsvetkov - Dr. Sc. (Eng.), Professor, Tver State University. E-mail: tsvet@tversu.ru