Biological purification loop device and method having deflector plate within guide pipe

A process for biological purification of pollutant-containing water in a reactor, such that said reactor is a closed vessel, and said purification is carried out by means of loop operation, said reactor comprising:

• (a) an insertable pipe located centrally and vertically within said vessel, such that said pipe is open at both ends, with the entrance end having a two-fluid nozzle project therein such that a biomass-water-gas mixture to be purified may be fed into said pipe,
• (b) a guide pipe having imperforate walls located concentrically around said insertable pipe within said vessel, such that said pipe is open at both ends and such that an inner annulus is formed between said insertable pipe and said guide pipe and an outer annulus is formed between said guide pipe and said vessel, said guide pipe projecting above and below the ends of said insertable pipe,
• (c) a deflector plate located below the exit end of said insertable pipe and within said guide pipe, such that said biomass-water-gas mixture is partly deflected into said inner annulus, and
• (d) at least one conically shaped sedimentation chamber located in the lower part of the reactor, such that said chamber is below the exit ends of said guide and said insertable pipes, wherein said process comprises the steps of
• (i) a biomass-water-gas mixture is fed into the insertable pipe of the reactor by means of the two-fluid nozzle;
• (ii) said mixture is deflected toward the inner annulus by means of the deflector plate, such that part of the mixture flows upward into the inner annulus, part flows downward through a suction pipe, and part flows into the outer annulus;
• (iii) the part of the mixture emerging at the upper end of the inner annulus is mixed with freshly incoming water-gas-biomass mixture by a driving-jet action of the two-fluid nozzle and is fed into the insertable pipe;
• (iv) the part of the mixture flowing upward in the outer annulus is subjected to a posttreatment reaction;
• and
• (v) said water from the biomass-water-gas mixture is removed as purified water from the reactor through an outlet pipe.