PERIPHYTON OF FIBROUS CARRIER «VIYA» IN THE AERATION TREATMENT FACILITIES

  • K. O. Dombrovskyi Zaporizhzhya National University
  • P. I. Gvozdiak A. V. Dumansky Institute of Colloid and Water Chemistry
Keywords: periphyton, structure, fibrous carrier, waste water, treatment facilities, aerotank

Abstract

The state of knowledge about the species composition, development dynamics, ecology and functioning peculiarities of the periphyton aggregations of the fibrous carrier in the treatment facilities is insufficient, and the study of the structural organization of the periphyton of «VIYA» type in the aeration treatment facilities (aerotank) at different water depths in Ukraine has been never conducted.

The purpose of the work was to study the peculiarities of the structural organization of the periphyton of the fibrous carrier at different water depths in the aeration treatment facilities.

For the first time, the peculiarities of the structural organization of the periphyton of the fibrous carrier «VIYA» at different water depths in the aeration treatment facilities were studied. The protozoans and metazoans invertebrates were present in the periphyton of the fibrous carrier. There were 12 taxa of the Protozoa subkingdom and 6 taxa of the Metazoa subkingdom among them. The protozoans were represented by infusoria (10 species) and 2 species of shell amoebae. The metazoans invertebrates were represented by rotifers (2 species), oligochaetes (2 species), tardigrades and nematodes – one taxon, respectively.

3 species, namely shell amoebae E. laevis, A. vulgaris and oligochaetes D. digitata, were present in the periphyton of the fibrous carrier at all studied water depths in the aeration treatment facilities in March. 5 species, namely E. laevis, A. vulgaris, D. digitata, P. ovum and E. lupus, were present in the periphyton of «VIYA» type in the aerotank in July.

The trophic structure of the periphyton aggregations of the fibrous carrier in the treatment facilities was represented by 4 groups in March, and by 5 groups in July.

The infusoria were among the bacteriodetritophages, which were represented by 5 species or 41,6 % of the species of the total composition of the found hydrobionts of the periphyton in March. The predators were represented by 3 species and composed 25 % of the total periphyton fauna. The bacteriophages and detritophages were represented by 2 species.

During the study of the trophic structure of the periphyton of the fibrous carrier conducted in July, it was found that infusoria, rotifers, nematodes and tardigrades belonged to the predators, which were represented by 4 taxa or 36,4 % of the species of the total composition of the found hydrobionts of the periphyton. The bacteriophages were represented by 3 species, and bacteriodetritophages by 2 species, these groups composed 27,3 % and 18,2 % of the total periphyton fauna. The detritophages and algophages were represented by one taxon, respectively.

There is a tendency to decreasing the number of periphytic organisms of the fibrous carrier with depth for 4 found trophic groups (bacteriodetritophages, detritophages, algophages and predators). Thus, the number of periphytic organisms of these trophic groups decreased from surface to the depth of 4 m by
75-92 %.

In general, it was found that the total number and species quantity of periphyton of the fibrous carrier in the treatment facilities decreases with depth (from surface to the depth of 4 m) by 23 % and 29 % in March, and by 77 % and 30 % in July, respectively.

The mobile planktonic and benthic forms predominated by number and species quantity among the found ecological-morphological groups of infusoria in the periphyton of the fibrous carrier in the treatment facilities. Their number was 66 % and 52 % of the total number of infusoria in March and July.

The attached infusoria forms in the periphyton of the fibrous carrier were found in the surface layer and at the depth of 2 m in the treatment facilities. The mobile periphytic and benthic forms of infusoria were found at the depth of 2-3 m. Only mobile planktonic and benthic forms of infusoria in the periphyton of the fibrous carrier were found in the whole water column in the aeration treatment facilities.

The activated sludge biocenosis was also investigated in the aeration treatment facilities in July. The amount of activated sludge biocenosis in the treatment facilities was high and composed 43312 sp/ml, mainly due to the development of shell amoebae, which composed 86 % of the total biocenosis. 2 species of infusoria, which did not occur in the periphyton aggregations of the fibrous carrier, were found in the activated sludge biocenosis, namely Euplotes patella and Stentor polymorphus.

The faunistic similarity of periphytic organisms of the fibrous carrier of «VIYA» type and the activated sludge biocenosis of waste waters in July was high and composed 56 %. The degree of similarity of the species composition of the periphytic organisms of the fibrous carrier found in March and July was medium and composed 43 %.

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Published
2018-07-03
How to Cite
Dombrovskyi, K. O., & Gvozdiak, P. I. (2018). PERIPHYTON OF FIBROUS CARRIER «VIYA» IN THE AERATION TREATMENT FACILITIES. Visnyk of ZNU: Biological Sciences, (1), 76-83. https://doi.org/10.26661/2410-0943-2018-1-11
Section
ECOLOGY AND CONSERVANCY