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This is composed of bacteria, algae and pleuston which is composed of larger organisms (Fig. 1). Fig. 1. 2. Periphyton Periphyton occupy the shore line zones. They are a group of organisms that create outgrowths upon various objects and underwater plants. Most of the time they usually consist of small algae - diatoms, green algae and bacteria. Moreover, various settled or semi-settled protozoa, eelwarms, oligochaetes, insect larva, and even crustaceans make up the periphyton biocenosis. Periphyton has a characteristic complex biocenosis and many ecological relationships can be observed between its components.

Depending on the composition of these bio-preparations used for bioremediation the above can be subdivided into microbiological (bacterial), enzymatic and bacterial–enzymatic. The advantage of microbiological preparations in relation to enzymatic preparations is the fact that the microorganisms multiply in a previously clean environment whereas the enzymatic preparations are added, in specific dosages, without the possibility of multiplication. One of the conditions which have to be met in order to obtain effective biodegradation is the bacteria's accessibility to the contaminated layers of soil.

Chrysophyta contain a and c types of chlorophyll. Their cell wall is enriched in silica. They produce lipids as reserve material. Fig. 7. Diatom - Epithemia sp. Fig. 8. Diatom Gomphonema constrictum Melosira varians Navicula sp. Fig. 9. Diatoms occur in Odra River: Melosira varians (left arrow), Navicula sp. ● Euglenophyta (Fig. 10-11). Euglenoids usually have an elongated shape. Their cells are equipped with flagella that allow movement in water or they move by crawling along the bottom. The cells are surrounded by a soft envelope called the pellicle.

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