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CNAA / Theses / 2008 / May /

Algalcenoses from filtration fields from the beet sugar factories and their role in the purification process of residual water

Author: Argentin Lungu
Degree:doctor of biology
Speciality: 03.00.16 - Ecology
Scientific adviser: Petru Obuh
doctor habilitat, professor, Institute of Ecology and Geografy of the ASM
Scientific consultant: Victor Şalaru
doctor habilitat, professor, Moldova State University


The thesis was presented on the 14 May, 2008
Approved by NCAA on the 18 September, 2008


Adobe PDF document0.32 Mb / in romanian


CZU 582.26:574.58:574.63.2

Adobe PDF document 5.20 Mb / in romanian
180 pages


algae, algal communities, taxonomy, ecology, saprobity, bioindication, residual water, filtration fields


In the studied ecosistems were determinated the structure and the ecological particularites of the algal vegetation during the seasons. During the fall season was evident the itensified of the development of euglenophytes and cyanophytes algae, being substituted in the spring-summer seasons by the clorococcal and diatoms algae. In the collectors’ basins of the residues, the algal vegetation (72 species) has vertical stratification: the superior level (0-0,2 m) was vegetated by euglenophytes, blue-green algae, the medium level (0,3-0,6 m) by blue-green algae + euglenophytes, the inferior level (0,6-0,8 m) was vegetated with bacteria, blue-green algae and colorless euglenophytes. In the biological purification basins the algal vegetation reached a maximum diversity (272 species) with predomination of green algae, euglenophytes and diatoms. The accumulation basins of the purified water were also characterized by high taxonomic diversity (221 species) of algalcenoses. The clorofites, diatoms and euglenophytes were in greater numbers. The indication of saprobity in comparison to the previous steps was 2,2-2,5. A reduction of the species indicated high saprobity took place in these pools (α, αβ and pα) and that the number of the β-, βo- and oβ- species was growing. In the step of evacuation of the purified water in the Cubolta River, the restructuring of the algal vegetation took place with the reduction of limnophyle and the predomination of the reophyle and limnoreophyle complexes. In total, in the medium sector of the Cubolta River 161 species of algae were detected, out of which 19 taxons were not found before in the filtration basins. In amounts of flow of confluence, were found 88 species, with the predomination of the green algae, euglenophytes, and diatoms. In the flow of confluence, the algal coenoses were enriched with 68 species. The number of common species between the Cubolta River and the Cainari River was 46, which indicated a floristic similitude relatively small (KJ = 0,23). The purification proceses of the residual waters take place with algal participation. In the summer season the bioproductivity and the algal purification activity is higher than in other seasons. In the result of algal activity the content of DOS in the residual water diminuated 9-12 times. The process of substitution of stenobiontic species through euribiontic species was noticed, with presense of random species. Approximately 75 species of algae from the studied ecosistems were good bio-indicators of water quality and can be applied in ecological monitoring.