METHOD AND PUMP UNIT FOR THE EFFECTIVE TREATMENT OF SEWAGE IN A TRANSFER TANK

U izvođenju metode prema izumu, kanalizacija akumulirana u odvodnom tanku se periodički odvodi te se, u danim okolnostima, miješa na takav način da se kanalizacija uvodi u pumpu horizontalno ili prema dolje pod oštrim kutom prema horizontali, a periodičko ispumpavanje se provodi na takav način da kada razina kanalizacije dosegne visinu od 1-30 cm iznad ulaznog otvora pumpe, električni motor ulazi u radnu fazu uz smanjeni kanalizacijski protok, a kada, u danim okolnostima, razina kanalizacije presijeca ulazni otvor i/ili impeler, električni motor radi bez kanalizacijskog protoka radi svrsishodnog ventiliran]a kanalizacije najmanje na 3 sekunde, ali osobito svrsishodno na barem 10 sekundi. Miješanje se izvodi na takav način da se kanalizacija prvo, u koaksijalnom vrtlogu s rotirajućom osovinom miješalice koja uzburkava kanalizaciju, ubrzava prema miješajućem elementu i zatim se vodi duž površine istog i eventualno izbacuje impulsnim načinom. Uređaj za ispumpavanje (4) se sastoji od električnog motora (5) i pumpe (6) i polaže se u odvodni tank na takav način daje njegova rotirajuća osovina horizontalna ili usmjerena pod oštrim kutom prema horizontali, a ulazni otvor (7) pumpe (6) se nalazi na vrhu. In performing the method according to the invention the sewage accumulating in the transfer tank is periodically drawn away and is, in given circumstances, stirred in such a manner that the sewage is guided into the pump horizontally or downward at an acute angle to the horizontal, and the periodic pumping is performed such that when the sewage level attains a height of 1-30 cm above the pump intake opening, the electric motor is operated at a reduced sewage throughput and when, in given circumstances, the sewage level intersects the intake opening and/or the pump impeller, the electric motor is operated without sewage throughput for ventilating the sewage advantageously for at least 3 seconds, but expediently for at least 10 seconds. Stirring is performed such that the sewage is, in a vortex coaxial with the rotary axis of the stirrer agitating the sewage, first accelerated toward the stirring element and then guided along the superficies thereof and is eventually ejected in a impulse-like manner. The pump unit (4) proper comprises an electric motor (5) and a pump (6) and is arranged in the transfer tank in such a manner that its rotary axis is horizontal or is oriented at an acute angle to the horizontal and the intake opening (7) of the pump (6) is at the top.