in line 32 it should be understood that any electric power generated by the system will result in savings in commercial power otherwise available at the site referring now to fig3 the spr is shown in use with mechanical vapor recompression an incoming solution or slurry is passed through line 80 to heat exchanger 81 where it picks up heat from the condensate in line 82 then passes through line 84 to heat exchanger 85 to absorb heat from hot concentrated liquid or slurry in line 86 from flash tank 87 and on through line 88 to the spr 89 spr 89 receives rotational power from mechanical power source 62 through shaft 68 the spr 89 further heats the incoming slurry or solution and forwards the heated fluid through line 50 optionally through a devolatilizer 51 and further through line 52 to flash tank 87 the spr may have a vent not shown for venting vapor or steam to the atmosphere or for carrying the vapor or steam to any device in the system that could use the heat or steam power therefrom in flash tank 87 steam or vapor is removed through line 56 and sent to compressor 57 which compresses it at the same time elevating its temperature because of the increased pressure compressor 57 receives rotational mechanical power from power source 62 through shaft 69 or from a different power source not shown for example an electrical motor which in turn may be.