Abstract. The article presents the efficient method of microwave irradiation (SHF) for the municipal liquid waste such as domestic wastewater and sludge. The technical and economic parameters and experimental data, showing the possibilities of microwave electromagnetic radiation using in the sewage and sediment treatment technologies, are given in this article. The traditional electrothermal treatment and SHF processing of the municipal precipitation, taken from the city wastewater treatment plant, have been compared. At the same time, a high rate of heating of the precipitation samples has been noted during the microwave treatment. The technical and economic comparison of three methods (with the usage of the reagents, convection heating and SHF) showed the advantages of using SHF range electromagnetic radiation. The energy efficiency and the cost-effective use of resources during the SHF using for liquid municipal waste treatment have been confirmed.

In this paper, we propose a method of treating wastewater and sludge by microwave radiation. Many Russian scientists are studying microwave effect on the properties of water and sladge and they are solving the practical application of microwave technology in the treatment of wastewater and sludge. Research carried out at the department “Water supply and sanitation”, Tyumen State University of Architecture and Civil Engineering (Russia), confirm changing properties of water and sediments. So too studies confirmed the economic feasibility of the use of microwave radiation for treatment plants having small capacity.

Treatment and further utilization of wastewater sludge are the important city service problem. The paper presents an efficient method of super high frequency irradiation for communal liquid waste such as wastewater sludge. The effect of microwaves on the properties of sediments, including the outlet of heavy metal ions in to water, is shown. Technical and economic indexes and results of experimental researches, indicating the opportunities of microwave irradiation in processes of sediments heating, are presented. The influence on sludge temperature of some technological SHF parameters has been studied. Because of statistic analyze, a regression polynomial equation describing the heating of sludge mixture has been obtained. The microwave and electro thermal processing of municipal liquid waste taken from a city’s wastewater plants have been compared. Energy efficient economy of microwave irradiation using for municipal wastewater sediments have been confirmed.

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