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1 Polish Journal of Chemical Technology

1 2005

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Biodegradation of post-refining waste and assessment of fertilizing capability of its compost

Latała A., Wierzba S., Polaczek B., Farbiszewska T.

Polish Journal of Chemical Technology

2005

Vol. 7, nr 2

22-27

This study was aimed at the utilization of the post-refining waste with the use of a bacterial biopreparation. Next, the fertilizing capability of the so obtained compost was assessed. The postrefining waste in the form of the oily bleaching soil (OBS) with a ca 15% content of fatty substances was taken from the Odra Fat-Processing Plant in Brzeg, Poland. The study was carried out on site, in experimental piles, and lasted for 2 months. In addition to the OBS, the composting masses contained: brown coal, peat, straw, sawdust. The biopreparation contained strains of lypolitical bacteria isolated from the waste, as well as taken from own collection, mainly of the Bacillus and Pseudomonas genera. The effects of the fertilizing action of the biopreparation were assessed on the basis of microbiological and chemical analyses, such as the total bacteria count, fatty substance content, micro- and macroelements content, and heavy-metal content. The introduction of the microbiological composite and the addition of organic components had a favourable effect on the bacteria count during the OSB biodegradation process. This resulted in the reduction of fatty substance content reaching almost 80%. The heavy-metal content in the composite did not exceed the maximum allowed values. Moreover, it was characterized by high calcium and magnesium contents, and low nitrogen content in relation to phosphorus and potassium.