NOVELTY - System to compost feces and treat urine, comprises: housing (11, 12, 13, 16) with interior space (10), feces compartment (7) in housing, liquid passage to drain liquid from feces compartment, vent (18) coupled to composting compartment to expose feces bed in compartment to air to compost, urine-treatment tank (8) coupled to liquid passage to receive urine from feces, substrate with aerobic nitrifying bacteria to form liquid from urine, feces bed with microorganisms to process feces in compost, and system is modular-based system where feces and urine compartments are in interior space.    USE - As system for composting feces and treating urine (all claimed).    ADVANTAGE - The system to compost feces and treat urine provides transportable rest facility which may easily disassembled as well as mounted together, and is easy to transport as it requires very little space in disassembled state as well as it can be easily put together with minimal effort due to uncomplicated construction. The system provides efficient portable system for handling human waste material in form of urine and feces by composting, where waste is treated to compost into sanitary safe waste and does not pose any health risk for surrounding people nor for persons handling waste after it has been composted. The system provides very environmental friendly rest facility with minimized maintenance required. By using microorganisms, system is more or less odorless. The composting process is distinct from anaerobic decomposition, which takes place naturally in water-saturated environments such as swamps, and is typical of septic tanks, where anaerobic or liquid-saturated, conditions produce methane and offensive odors associated with septic systems. The system provides better alternative than flush toilets, sewers and sewage treatment. Moreover, it is more or less odor free, easy to use and maintain, has appealing design, and functions in harmony with environment. The system achieves easy way of mounting sanitary safe and well functioning portable rest facility i.e. provides both logistic as well as economic advantages in one solution. Also, system provides efficient solution for handling of feces and urine also in relation to non-portable rest rooms e.g. to be used on boats.    DETAILED DESCRIPTION - A system for composting feces and treating urine, comprises: housing (11, 12, 13, 16) enclosing interior space (10), feces compartment (7) disposed within housing including feces inlet (6) for receiving feces from feces receiving part (2) disposed in interior space, liquid passage so that liquid can be drained from feces compartment, vent (18) coupled to composting compartment for exposing feces bed inside composting compartment to sufficient air to allow feces to compost, to form compost product, urine-treatment tank (8) coupled to liquid passage for receiving urine from feces compartment, substrate with aerobic nitrifying bacteria disposed on substrate so that urine is treated by bacteria forming liquid product, feces bed is arranged to comprise microorganisms able to process feces into fertile compost, and system is modular-based system where side walls are vertical and feces compartment and urine compartment, are positioned within interior space. The urine compartment is arranged below feces compartment. The feces compartment and urine-treatment tank use at least on same inner side wall, layer as compartment wall. The inner side wall layer also forms inner surface delimiting interior space. At least one of the side walls comprises first hollow space connected to urine compartment. At least one of the side walls also comprises second hollow space that is separated from first hollow space, and arranged to contain water. In at least at one sidewall there is arranged urinal on opposite side in relation to feces compartment. The urinal has its lowest portion positioned at level below top level of feces compartment. Further, at least one additional urine container is positioned onto ground next to at least one of walls, where preferably additional urine containers form walkable floor. At least two modules of rest rooms comprising system are positioned next to each other, presenting different designs fulfilling different needs, and interfitting into total assembly forming station having unitary look. An INDEPENDENT CLAIM is included for method for composting feces and for treating urine, involving: providing housing enclosing interior space, feces compartment disposed within housing including feces inlet for receiving feces from feces receiving part disposed in interior space, liquid passage so that liquid can be drained from feces compartment, vent coupled to feces compartment for exposing feces bed inside feces compartment to sufficient air to allow feces to compost to form composed product, urine treatment tank coupled to liquid passage for receiving urine from feces compartment, substrate with aerobic nitrifying bacteria disposed on substrate so that urine is treated by bacteria forming liquid product, and feces bed is arranged to comprise microorganisms able to process feces into fertile compost; and providing system in modular form having side walls that are vertical and feces compartment and urine compartment are positioned within interior space.    DESCRIPTION OF DRAWING(S) - The figure shows schematic view of assembled rest station comprising the system for composting feces and treating urine.    Feces receiving part (2)    Feces inlet (6)    Feces compartment (7)    Urine-treatment tank (8)    Interior space (10)    Housing (11, 12, 13, 16)    Vent (18)