Influence of physical and chemical factors on organisms in activated sludge wastewater treatment

Ptiček, Ana (2011) Influence of physical and chemical factors on organisms in activated sludge wastewater treatment. Bachelor's thesis, Faculty of Science > Department of Biology.

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Abstract

Parellel with technological development increas demands for environmental and water protection. The most common wastewate treatment is the biological activated sludge process. The activated sludge generated bacteria, protozoa, metazoa and suspended particles in flocs. The role of organisms in activated sludge is to incorporated dissolved substances from wastewater into their biomass and as a product result in gases and insoluble particles. Bacteria, cilliates, flagellates, and rotifers are organisms that are most involved in the biological wastewater treatment. Protozoa and Metazoa are using bacteria and organic particles as food. Their abundance and variety is measure for quality and effectiveness of activated sludge wastewater treatment Biological activity of microorganisms depends on temperature, amount of dissolved oxygen, pH, quality and quantity of ingredients in the water. The optimum pH for the activity of microorganisms is 7.5-8.0 and the optimum temperature conditions are between 25 ° C - 35 ° C. Toxic substances found in activated sludge are heavy metals (copper, zinc) and they cause loss of microorganisms activity and death.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Špoljar, Maria
Date: 2011
Number of Pages: 14
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 24 Oct 2014 09:24
Last Modified: 24 Oct 2014 09:24
URI: http://digre.pmf.unizg.hr/id/eprint/3159

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