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Wpływ anionowych substancji powierzchniowo czynnych na proces biologicznego oczyszczania ścieków

100%

Smółko M.

tom Z. 18

131-143

W pracy podjęto próbę określenia wpływu trzech anionowych detergentów na parametry charakteryzujące pracę i biocenozę osadu czynnego. Badania objęły kontrolę parametrów fizykochemicznych, techniczno-technologicznych oraz oznaczenia hydrobiologiczne dla różnego stężenia zwiazków. Jednoczesnie określono efektywność biochemicznego utleniania anionowych detergentów.

In the paper we try to investigate the effect of three different anionic surface active agents on the parameters of labour and biocenosis of activated sludge. We have determined the physicochemical, technic-technological parameters and hydrobiological conditions for different concentrations of investigated substances. We also investigate the efficiency of biochemical oxydation of anionic surface active agents.

The influence of soluble microbial products on microbial community composition: hypothesis of microbial community succession

75%

Chipasa K. B. , Medrzycka K.

nr 1

Soluble microbial products (SMP) are organic compounds produced by activated sludge microorganisms as they degrade substrates. They include by-products of microbial activity, death and lysis. The available literature does not reveal how SMP influence microbial community composition. In this regard, we microscopically studied changes in composition of microbial communities, especially protozoa and metazoa, under the influence of increased as well as reduced levels of SMP. The presence of SMP at high level significantly caused changes in microbial community composition. Microbial species shifted from attached ciliates (12-175 μm) to free-swimming and crawling ciliates (35-330 μm) and then invertebrates, which included rotifers (0.2-1 mm) and nematodes (1-50 mm). The shift of small-size microorganisms to large ones was observed as one of the most significant influences of SMP. Attached ciliates reappeared when we removed the SMP that had accumulated in the bioreactors - we have called this as the resurrection phenomenon of microorganisms. Such rapid changes in microbial community composition were not observed in the experiment with low concentration of SMP. Overall, the results suggest that accumulation of SMP is one of the intrinsic regulatory mechanisms that control viability and dormancy of microbial communities in activated sludge.

Improving the operation of the full scale wastewater treatment plant with use of a complex activated sludge model

51%

Liwarska-Bizukojc E. , Biernacki R. , Gendaszewska D. , Ledakowicz S.

Environment Protection Engineering

2013

tom Vol. 39, nr 1

183--195

A complex activated sludge model implemented in BioWin software has been implemented to assure its predictability and improve the effectiveness of biological wastewater treatment in the full-scale plant in Poland. The influence of temperature and sludge retention time (SRT) on the quality of the effluent was also studied. The calibration was successfully performed according to the Good Modelling Practice Unified (GMP) protocol. Five parameters at a steady state and ten under dynamic conditions were calibrated. It occurred that in the studied wastewater treatment plant SRT should be kept at the low level sufficient to sustain nitrification.