Patent EP-2628712-A1 (EP)
Inventor: KOMOROWSKI ARTUR
IPC: B01D21/00
Filed: 2012-07-09
Abstract: The invention relates to adiabatic, mechanical-biological sewage treatment plant, designed for urban sewage treatment. 
     Sewage treatment plant is created by the cylindrical tank of anaerobic reactor  1  with located in the middle the cylindrical tank of aerobic reactor  2.  The aerobic reactor  2  is at the bottom of the anaerobic reactor 1. Sewage is inserted (usually influenced by gravity) into the initial zone  3  of the anaerobic reactor  1  through the input  4  and is initially broken on plate  5 . In the zone  3  of the anaerobic reactor  1  there are mechanical treatment processes, mainly sedimentation and separation of solids on the rough grille  6.  Next, sewage flow by gravity to the initially clarifying zone  3b  of the reactor, separated from the other zones by the wall  7.  In the wall  7  there are units of clarifying siphons  8  connected with air flotation units  9 . Then sewage, thanks to placing the input in siphons  8  at a suitable height, flow from the zone  3b  (initially clarified) by siphons  8  upwards to the level of separating ridges  10 , which also stop rising suspension. After passing through the ridges 10 pollution run as cascade to the second zone  11  of the anaerobic reactor 1, which acts as a retention buffer (with a third zone  12 ) and adopts the impulse of discharge of sewage occurring for example during the day. In the zone  11  there is further clarification of the solution of sewage and its gravity flow into the third zone  12  through the siphons  13  located on the compartment  14 , that divides the second zone  11  from the third zone  12  of the anaerobic reactor  1 . From the third zone  12  almost completely clarified sewage is taken regularly by air lift  15  (a mammoth pump) to the aerobic reactor  2.  Clarified sewage through the injection system is taken by the vertical main pipe  16  to the bottom part of the aerobic reactor  2,  which acts as a settling tank and anoxic zone. At the end of dosing cycle sewage is led by a rotary pump  17  through the discharge pipe 18 to the top part of the aerobic reactor  2.  There, by a system of horizontal pipes  19  sewage flows to cyclone sprinklers  20 , while the pipe  19  can be fixed or rotary (depending on system size). On the pipes  19  before the cyclone sprinkler nozzles  20  are located injector nozzles  21 , which at the time of the flow of the sewage in the inner pipe suck the air through circumferentially spaced holes in the outer pipe and also aerate the flowing load. So prepared emulsion of air and sewage drops in rotary motion on the deposit  22 , made of plastic. The stream of sewage flowing to the deposit  22  is thoroughly broken thanks to the sprinkler system combining a cyclone and injector effect. The same sprinkler system provides increased surface of exchange phase liquid - gas, an even hydration of the surface of the deposit maintaining adequate hydraulic load and prevents build-up of nozzles with biological membrane. Under the biological deposit  22  is a secondary settling tank  23  and a pipe  24  leading treated sewage outside. The sludge from the secondary settling tank  23  is transported by a pipe  25  to the initial zone  3a . The deposit  22  is aerated mechanically by a spiral diffuser  26  located under the deposit  22.