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.
Highlights
The environment of the modern world has become increasingly polluted
The indicators of the domestic wastewater quality such as the suspended matter, biological oxygen demand (BOD), chemical oxygen demand (COD) and nitrogen of ammonium salts depend on the amount of the wastewater undergoing the treatment [1,2,3]
At the Wastewater Treatment Plants (WWTP), especially in the northern cold conditions, it is necessary to use a big amount of traditional equipment units, huge quantity of energy and resources to ensure the normative water quality
Summary
One of the reasons for the worsening of the world ecology state is the discharge of the untreated sewage into the water sources and the accumulation of massive amounts of precipitation around the cities and settlements. The problem of the effective treatment and economical utilization of the municipal liquid waste is urgent worldwide. The problem of the qualitative sewage treatment and sediments’ processing with the further utilization is important for cities, towns and villages in Russia. The microwave irradiation (SHF) has been widely used as an effective thermal method for the wastewater and sludge treating, mainly due to its rapid and selective heating, energy efficiency, the ability to increase productivity and product quality, and to reduce the formation of hazardous products. Some problems of the high-quality wastewater treatment and sludge utilization can be solved with this method
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