Task: Translation
Input (Czech): e en  se t²k  malokapacitn ho biologick ho  istic ho za° zen , kter  sest v  z n dr e (1) pro p°edb  n   i t n  vody a ukl d n  kalu, kter  je opat°ena p° vodem (6) odpadn  vody a za kterou je za°azen biologick² stupe  (2) s biologicky aktivn m kalem/biovrstvou a odpojiteln²m zavdu  ovac m za° zen m (4), kter² je z  sti vypln n mikroorganismy o iviteln²mi kultiva n mi t l sky (5) s os dliteln²m povrchem nejm n  800 m.sup.2.n. na m.sup.3.n. sypn ho objemu, ve kter m je k zadr ov n  kultiva n ch t l sek (5) uspo° d no zadr ovac  za° zen  (8) a na kter² navazuje do i  ovac  n dr  (3) s pr tokem ve svisl m sm ru, kter  je opat°ena odtokem (7), p°i em    sti (1 a  4) malokapacitn ho  istic ho za° zen  jsou uspo° d ny v kruhov  n dr i. V biologick m stupni (2) je p° davn  uspo° d n biologick² filtra n  stupe  (9), kter² je napln n kultiva n mi t l sky (5) a slou   jako denitrifika n  stupe  a do kter ho ·st  p° vod z n dr e (1) pro p°edb  n   i t n  vody a ukl d n  kalu a p° vod zp tn  zav d n ho kalu z do i  ovac  n dr e (3).\
Output (English): The invention concerns a small-scale biological sewage treatment plant operated by fluid bed/biofilm technology for treating waste water. According to the invention, for the biological/biofilm treatment of the activated sludge a biostage (2) with an aeration device (4), which can be switched off, is arranged downstream of a preliminary sedimentation tank with a sludge reservoir (1) and a feed pipe (6). The biostage (2) is partially filled with growth bodies (5) having a colonizable area of at least 800 square meters per cubic meter of bulk volume and comprises a retention device (8) for retaining the growth bodies (5) in an obstruction-free manner. Disposed after the retention device (8) is a final sedimentation tank (3), which can be flowed through vertically and has a discharge (7), the parts of the plant (1 to 4) preferably being disposed in circular tanks. The retention device (8) can consist of a pipe in or over which a discharge pipe leads into the final sedimentation tank (3). The biostage (2) can further comprise a biofilter stage (9) into which lead the feed pipe from the preliminary sedimentation tank (1) and the feed pipe for returned sludge from the final sedimentation tank (3).