Sewage treatment plant

An aerobic sewage treatment plant comprising:

• a vacuum flush system;
• a sewage collection tank, connected to the vacuum flush system, for receiving sewage therefrom;
• a settlement tank, connected so as to receive liquid sewage output from said collection tank, said settlement tank having a liquid sewage outlet and a settled solids outlet;
• a water dilution means, connected to said liquid sewage outlet of the settlement tank, for diluting liquid sewage and for optimizing subsequent biological processing;
• an aeration tank, connected to receive diluted liquid sewage from the settlement tank, said aeration tank having a sewage outlet and a sludge deposit outlet;
• a sludge monitor, connected to the aeration tank, for providing a signal for controlling release of sludge;
• transfer pump means for controllably pumping liquid sewage output from said sewage collection tank to said settlement tank, for controllably pumping liquid sewage from said settlement tank to said water dilution means, for controllably pumping diluted liquid sewage from said water dilution means to said aeration tank, for pumping said sewage from said aeration tank sewage outlet and sludge deposits from said aeration tank sludge deposit outlet, in response to and under the control of a transfer controller;
• and
• a transfer controller, responsive to at least to said sludge monitor signal, for enabling said transfer pump means to pump between said sewage collection tank, said settlement tank, said water dilution means, said aeration tank and remove material from said aeration tank in controlled batches.