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EN
The paper presents results of two year field and laboratory investigations of a denitrifying system below leach lines. More than two days retention time was provided by siphoning of the denitrifying trough located 35 and 60 cm under the leach lines. Due to clogging and capillary suction in medium sand the seepage flow through the denitrifying troughs was limited to less than 10 % of the sewage inflow. Average efficiency of the total nitrogen removal was equal to 55 % after 3-4 days of travel time within the soil. To force wastewater to pass through the anaerobic bed within the trough two lateral vertical impermeable membranes are recommended.
EN
Results of carbon and nitrogen removal by moving bed biological reactors operating in two modes – continuous flow and sequencing batch – are presented. Three hybrid reactors with intermittent aeration were simultaneously operated in laboratory. Real septic tank effluent from a household was treated. The research confirmed satisfactory removal of carbon and nitrogen (up to 88% and 64%, respectively) by the hybrid reactors. The most preferable conditions for carbon and nitrogen removal were: hydraulic retention time = 0.55 d with 15/15 minutes aeration/non-aeration intervals in continuous flow reactors and four-hour cycles in sequencing batch reactors. Higher COD loadings on reactors’ volumes induced higher biomasses of biofilm and lower concentrations of activated sludge, but sludge wastage was negligible. Various groups of organisms were observed in both – activated sludge flocks and biofilm. The highest concentration of filamentous microorganisms was observed in the reactor with the highest COD loading. Rotifers were much more abundant in biofilm than in flocks, due to their relatively long growth time.
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tom 39
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78-81
PL
Przedstawiono charakterystykę oczyszczalni glebowo-korze- niowych systemu prof. R. Kickutha oraz pracę niektórych obiektów wykonanych w Niemczech. Podano również przegląd takich oczyszczalni działających w Polsce.
EN
The characteristics of reeddeds of the Professor Kickuth's and the operation of a few of facilities constructed in Germany were discussed. The overview of sewage treatment plants of this type which are in operation in Poland was also provided.
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