Protozoa in technologies for water treatment

Jaćimovska, Maja (2009) Protozoa in technologies for water treatment. Bachelor's thesis, Faculty of Science > Department of Biology.

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Abstract

Protozoa are single cellular eukaryotic organisms with a complex structure. These organisms natural habitats are standing waters in which there are high amounts of decomposed plant material and other organic wastes that indicate their affinity to high organic production waters. Given this fact we can conclude that these protozoa can be used in water cleaning devices based on activated sludge, and this primarily for spring waters, lakes and waste waters. Active sludge is a community of micro-organisms (bacteria, protozoa, algae) in which each specie is specified to its own work; aerobic bacteria use organic material in their own metabolisms and thus lower its amounts in their surrounding, while protozoa produce gelatin mud flakes (flocula) and with their cilia bring up nutrients from the bottom, which all together stimulates production of micro-organisms. These protozoa graze on aerobic bacteria allowing them to control the bacterial biomass and stabilize the whole water cleaning plant. Another important role that the protozoa have is their role as bioindicators; the appearance of specific protozoa in waters indicates that the waters contain high amounts of organic production and toxic material. They can also indicate processes of sludge sedimentation, amounts of oxygen (that the aerobic bacteria use for their metabolism) as well as amounts of amonia in incoming water and drain.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Matoničkin Kepčija, Renata
Date: 2009
Number of Pages: 20
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 19 Dec 2014 11:46
Last Modified: 16 Feb 2016 14:10
URI: http://digre.pmf.unizg.hr/id/eprint/3566

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