Toilet arrangement

A toilet arrangement, comprising:

• a gravity toilet bowl provided with a water trap and an outlet having a diameter corresponding to a given first diameter of a gravity sewer pipe;
• a flush water tank-connected to a source of water by a water valve and to the gravity toilet bowl by a flush valve for providing flush water to the gravity toilet bowl during a flushing sequence;
• a push button;
• a vacuum sewer piping with a given second diameter, the given second diameter being less than the given first diameter of the gravity sewer pipe;
• a discharge valve having a diameter corresponding to the given second diameter of the vacuum sewer piping;
• a vacuum unit connected to the vacuum sewer piping for generating vacuum in the vacuum sewer piping;
• an adapter fluidly coupled between the outlet of the gravity toilet bowl, having the given first diameter of the gravity sewer pipe, and the discharge valve, having the given second diameter of the vacuum sewer piping, wherein a first end of the discharge valve is directly connected to the outlet of the gravity toilet bowl by the adapter, and a second end of the discharge valve, opposite to said first end, is directly connected to the vacuum sewer piping;
• a controller configured to be activated by the push button and operatively connected to the vacuum sewer piping, the discharge valve, the water valve, the flush valve, and the vacuum unit whereby sewage disposed in the gravity toilet bowl is arranged to be directly discharged from the gravity toilet bowl through the water trap and the outlet provided with the adapter into the vacuum sewer piping through the discharge valve in connection with the flushing sequence.