The influence of various factors (initial concentration of the solution, contact time of the biosorbent with the solution, and the action of a constant parallel magnetic field of intensity 4 kA/m (50 Oe)) on the processes of extraction of heavy metal ions (Zn, Cd, Cu) from wastewater with the help of bioelectrochemical reactor - duckweed is in the focus of this study.

The article considers modeling of modern heat exchange systems which use thermal energy for its beneficial use. The proposed mathematical model makes it possible to investigate systems with utilization of thermal energy. The article presents the results of simulation of heat exchange processes using heat energy recovery for internal combustion engines.