Microbiological assessment of wastewater of milk processing enterprise

Abstract

Recently, microbiological methods of wastewater treatment have been increasingly used. Microbiological destruction of a wide range of polycarbon organic compounds occurs due to the formation of a microbial sequence. The sequence consists in the fact that the end products (exometabolites) of “primary” destructive microorganisms are the primary substrates for “secondary” destructive microorganisms. The purpose of the work was to conduct a microbiological assessment of industrial wastewater from the fi ltration pond of a dairy processing enterprise using a biological purifi cation system. The proposed concept is a spatial sequence for the treatment of wastewater containing a wide range of organic substances of high concentration. The essence of the biological purifi cation system was the introduction of microbiological preparations into wastewater according to an individually developed technology. At the same time, air was additionally injected into the water column by an aerator. Wastewater sampling was carried out in accordance with the general requirements for surface waters according to National State Standard 31861-2012. Sample preparation and research were carried out using standard techniques. The wastewater of milk processing enterprises contains a signifi cant amount of proteins. During the decomposition of the protein the process of ammonifi cation occurs, i.e. the splitting of amino groups and their accumulation in the medium in the form of NH4 or NH3, these compounds alkalize the medium, which explains the increase in pH. The conducted sanitary and microbiological studies of wastewater and biofi lm using a biological wastewater treatment system of the milk processing enterprise indicate that a decrease in the concentration of organic matter is a consequence of the positive redox potential of the medium. The increased value of the redox potential means the decrease in the concentration of organic compounds in wastewater, which is an indicator of the effectiveness of treatment.