Science – Future of Lithuania / Mokslas – Lietuvos Ateitis, Vol 9, No 4 (2017)

Investigation of Activated Sludge Process

Aušra Mažeikienė (Vilnius Gediminas Technical University, Lithuania)
Julita Starenko (Vilnius Gediminas Technical University, Lithuania)

Abstract


It is important to control not only the large wastewater treatment plants work, but also the work of individual small wastewater treatment plants for the protection of environment. Individual small wastewater treatment plants can become the local sources of pollution, when they are not functioning properly. Sewage purification indicators are not always the same as declared at wastewater treatment plants documentation in real conditions, so it is important to control the properly work of individual small wastewater treatment plants. The work of the small wastewater treatment plant AT-6 was analyzed by the treated sewage results (BDS7, SM, NH4-N, NO3-N, NO2-N, PO4-P), the quality of activated sludge, biological indicators and enzymatic activity in this article. The nitrification process was not going very well by the results of research, because there was the 72 mg/l concentration of ammonium nitrogen remaining in the cleaned wastewater. The morphological study of the activated sludge has confirmed the hypothesis that the necessary conditions for nitrification process were not established. The oxygen supply was increased and the small wastewater treatment plant functioning become more efficient, because nitrification process started working properly – there was less than 1 mg/l of ammonium nitrogen remaining in the cleaned wastewater.

Article in: Lithuanian

Article published: 2017-09-11

Keyword(s): activated sludge; sewage; individual treatment plant; BDS7, total suspended solids; ammonium nitrogen; nitrate nitrogen; phosphate.

DOI: 10.3846/mla.2017.1053

Full Text: PDF pdf

Science – Future of Lithuania / Mokslas – Lietuvos Ateitis ISSN 2029-2341, eISSN 2029-2252
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 License.