NOVELTY - A bioreactor for continuous anaerobic digestion of organic matter, has an inlet for introducing organic matter into the bioreactor; a main reaction chamber (36, 38, 40) for the organic matter; and an anti-chamber(s) arranged between the inlet and main reaction chamber.    USE - The bioreactor is used as a solar powered or solid waste bioreactor, for continuous anaerobic digestion of organic matter (claimed), e.g. animal waste, effluent slurry, human waste, and food processing waste. It is useful for domestic waste, such as domestic refuse and foul waste. It is for domestic or small-scale industrial use, for e.g. restaurants, grocers, and supermarkets, and institutions, such as schools, hospitals, and prisons. It can be installed to service a cul-de-sac, terrace, or street of houses.    ADVANTAGE - Additional organic matter can be introduced into the bioreactor through the inlet, without affecting the level of oxygen in the main reaction chamber. The bioreactor is solar powered, and adapted for operating continuously in the thermophilic temperature range, without an auxiliary supply of energy. It is adapted for collecting leachate from organic matter in the bioreactor, and reintroducing the leachate into the organic matter in the bioreactor. It is in the form of a non-fixed portable unit, and cost effective. It is able to operate at an efficient level, with successive loads of organic material, and without having to modulate the feed rate or methane production cycle.    DETAILED DESCRIPTION - A bioreactor for continuous anaerobic digestion of organic matter, has an inlet for introducing organic matter into the bioreactor; a main reaction chamber for the organic matter; and an anti-chamber(s) arranged between the inlet and main reaction chamber, in which the chambers are arranged so that organic matter can pass from the inlet, through the or each anti-chamber and into the main reaction chamber, and additional organic matter can be introduced into the bioreactor through the inlet, without affecting the level of oxygen in the main reaction chamber.    DESCRIPTION OF DRAWING(S) - The figure is a schematic diagram showing the interrelationship between the internal components of the bioreactor.    Hatch (16)    Main reaction chamber (36, 38, 40)    Rotary vane (42)