Scientific and practical principles of regulating technogenic pollutants in municipal wastewater

Summary

The results of statistical processing actual data evidence the lack of linear relationship between technogenic pollutant concentrations at the input of the municipal wastewater treatment facilities and effluent after biological treatment. It proves the lack of the principles of the technical approach used to regulate the customers before 2013 and confirms the fact that the permissible pollution discharge limits shall be set exclusively on the assumption of preventing any negative impact on the public wastewater disposal systems. Permissible pollution concentration limits have been developed and proposed for introduction into the Rules of cold water supply and wastewater disposal.

Key words

treatment facilities , municipal wastewater , industrial wastewater , technogenic pollutants , permissible concentration limit for effluent discharge into the public sewer

Technological aspects of dewatering sludge of industrial-storm
wastewater of motor transport enterprises

Summary

Information on the conditions of generation, volumes, chemical composition and properties of sludge generated at the industrial wastewater treatment facilities of motor transport enterprises is provided. Examples of process engineering solutions for dewatering sludge generated during the wastewater treatment process are given. The technological aspects of enhancing mechanical dewatering of thickened sludge using high-molecular polyelectrolytes are considered. The data of laboratory experiments on choosing the type of flocculant, its dose, technological parameters of the process, as well as the results of determining the moisture content of dewatered sludge obtained in a model of a drum vacuum filter are presented. Examples of effective domestically produced dewatering apparatus and their technical characteristics, recommendations and criteria for their selection, as well as factors influencing the operational parameters of the dewatering equipment are given. It is found that the highest dewatering capacity of drum vacuum filters (residual sludge moisture content from 66 to 83%) can be achieved by using VPK-402 cationic flocculant for processing sludge generated at the workshop premises of a motor transport enterprise.

Key words

technogenic pollutants , local treatment facilities , industrial stormwater runoff , motor transport enterprises , drum vacuum-filter , high-molecular flocculant , equipment for mechanical sludge dewatering

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