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The role of algae and some superior plants in biological purification of zootechnical complexes residual waste waters

Author: Ichim Maria
Degree:doctor of biology
Speciality: 03.00.18 - Hydrobiology, ichthyology
Scientific adviser: Victor Şalaru
doctor habilitat, professor, Moldova State University
Scientific council:


The thesis was presented on the 28 November, 2007
Approved by NCAA on the 20 December, 2007


Adobe PDF document0.47 Mb / in romanian


CZU 574-635+628-335:582•2/•3

Adobe PDF document 1.35 Mb / in romanian
151 pages


algae, superior plants, biomass, zootechnic complexes, residual watste waters, biological purification


In the present work there are presented the results of cultivation under laboratory and partially natural conditions of the five algae strains (Synechocystis salina, Chlorella vulgaris, Scenedesmus vulgaris, Scenedesmus quadricauda, Rhizoclonium hieroglyphicum, Cladophora fracta) and three species of the superior plants (Lemna trisulca, L. minor, Myriophyllum spicatum) on the medium with addition of the residual waste waters from the zootechnical complexes growing poultry, pigs and cattle. There have been revealed that all plant species tested in our experiments intensively develop on the media with different concentration of the waste waters, but the optimal concentrations are 10-20%. Addition of the higher waste waters a concentration significantly slow down plants development, but does not lead to their death. Some species continue to develop even with concentrations over 50% of residual waters in the medium.

There has been demonstrated that algae and superior plants assimilate up to 96-98% of nitrogen and phosphorus dissolved in the waste waters, contributing in such way to the intensification of the biological water purification processes. The biomass obtained on the media with addition of the residual waters qualitatively does not differ from that one grown on the mineral media. Using of this biomass as a nutritional supplement in feeding of poultry and agricultural animals significantly increase their productivity and production quality.

As well there has been evidenced that algae and superior aquatic plants biomass obtained on media with addition of the residual waters costs 10-20 time less than that one grown on the mineral media. Algae and superior plants release in water high quantities of oxygen as the result of photosynthesis that contributes to the mineralization of the organic substances in water