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This study aimed to evaluate operation technology and functioning of facilities for the treatment of municipal sewage in a small wastewater treatment plant operating based on the trickling biofilters technology, in the winter (February) and summer (June-July) periods. Additional analyses were conducted to determine the effectiveness of contaminants removal in particular facilities of the technological system tested. Study results indicate that the sewage treatment plant operating based on the trickling biofilters technology ensures effective removal of organic compounds, total nitrogen, total phosphorus, and total suspended solids. In the summer period, the effectiveness of contaminants removal reached 92%, 52.9%, 97.9%, and 99.9%, respectively, whereas in the winter season it was lower an reached 69.5%, 12.4, 93.0, and 95.0%, respectively. Treatment effectiveness achieved in this study was referred to results of investigations conducted in the same sewage treatment plant 24 years ago. Results obtained may provide a valuable guideline to designers and operators of small sewage treatment plants.

The aim of the study was to determine the degree of an organic substrate consumption in the denitrification process involving a biofilm in four-stages laboratory scale rotating biological contactor (RBC). The discs submergence was 40% of their diameter. Acetic acid, used as external carbon source, was fed to the fourth stage of RBC. Consumption of substrate was observed for 2 and 24 hours. For a shorter period there was the removal of 37.9 ± 1.8 mg N·m-2, while using 499,9 ± 33.2 mg O2·m-2 of organic compounds. The prolongation of the experiment duration guaranteed higher efficiency of denitrification. The ratio of organic substrate used to the amount of nitrogen removed was 13: 1 and 21: 1 for 2 and 24 hours respectively.

In this study the effectiveness of sorption Basic Violet 10 were examined (the popular in the industry cationic dye), on 6 different non-conventional sorbents: chitin, sawdust, compost, silage corn, zeolite and fly ash. For each test sorbent was determined optimum pH of sorption. Was also a designated the maximum sorption capacity with respect to the Basic Violet 10. The results obtained were analyzed with the use of three sorption isotherms: Freundlich, Langmuir and double Langmuir. Among the organic sorbents tested, the highest capacity relative to Basic Violet 10 shown sawdust (Qmax = 156.5 mg/g) and corn silage (Qmax = 180.8 mg/g). In the case of mineral sorbents such as zeolite or fly ash, the maximum absorptive capacity Basic Violet 10 was respectively Qmax = 144.1 mg/g and 170.1 mg/g.