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Petru Spataru, Speaker at Catalysis Conference
Institute of Chemistry, Moldova, Republic of
Title : The influence of temperature and presence of organic sulfur R S H on the separation degree of organic solids from wastewater


In the technology of separation of organic solids from wastewater, there are several ways of combining activated sludge, produced under technological aeration conditions, with primary sediment, obtaining different results depending on the ambient temperature, so the natural climatic conditions. At the same time, the sedimentation dynamics depends directly on the temperature. As the usual summer temperatures do not exceed thirty degrees, the bio-coagulation process takes place, which ensures about 5% concentration by gravitational sedimentation. Using flocculants, dispersed systems can be processed/concentrated/dehydrated by centrifugation. However, in the temperature range 40-45oC, under thermo-mesophilic conditions, a separation process takes place not by sedimentation, but by well-contoured flotation. In the conditions of dehydration of organic solids in sediment processing, the temporary, short-term reduction of the smell of organic residues is recently used by treating them with inhibitory preparations, which link organic sulfur with the general formula R-S-H, in which R is an organic radical. The above-mentioned treatment aims to replace hydrogen from organic sulfur compounds of the general formula R-S-H with an organic radical, which makes it possible to reduce the odor of organic residues in biological treatment. Experiments through laboratory simulations show that the replacement of hydrogen with a radical leads to a decrease in the flotation effect within the thermomesophilic separation process. Thus, the lack of R-S-H compounds leads to the decrease of gaseous microbubbles that ensure the flotation process. In this way the flotation conditions are ensured by the thermomesophilic temperature regime and the presence of organic sulfur compounds with adjacent hydrogen.


Dr. Spataru studied Chemistry at the Chi?inau State  University, Republic of Moldova with a bachelor's thesis in the field of nuclear magnetic resonance in 1977.In 1995-2013 employee of the National Institute of Ecology .DhD Chemistry since 2011.  From 2013 until today senior scientific researcher then (2016) coordinating scientific researcher in the Laboratory of Physical-Chemical Methods of Research and Analysis Has published more than 80 research articles in SCI(E) journals.