Treatment and utilization of liquid communal waste in the cities

Abstract

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.

Microwave Irradiation in Technologies of Wastewater and Wastewater Sludge Treatment: A Review

“…It is confirmed in the materials [25][26][27], which use the Netherlands, Kenya, China, and other countries as examples of MW-heating of faecal sludge (Figure 2). Under the influence of MW, several parameters such as strength, frequency, duration, treatment temperature, and sample volumes [9,14,[22][23][24][25][26][27] can influence the efficiency of pollutant decomposition and mineralisation of wastewater and sediments. It is confirmed in the materials [25][26][27], which use the Netherlands, Kenya, China, and other countries as examples of MW-heating of faecal sludge (Figure 2).…”

“…It should be noted that the technological and economic efficiency of MW heating for the water environment is currently actively explored by contrasting it to other methods of heating and processing [14,23,24]. The Department of Water Supply and Sanitation (Industrial University of Tyumen, Russia) laboratory has carried out several experiments related to the MW-heating of wastewater sludge [14,24]. Firstly, a comparison is made between microwave and electric heating.…”

“…According to observations, ultrahigh-frequency irradiation of liquid sewage sludge has a rapid thermal effect: samples of sludge with a 50-300 mL volume started to boil within one to two minutes (Figure 3) [14]. lated to the MW-heating of wastewater sludge [14,24]. Firstly, a comparison is made between microwave and electric heating.…”

Evaluation of Communal Waste in Slovakia from the View of Chosen Economic Indicators

“…Wastewater and liquid waste present an important service problem in municipalities. In this area, Vialkova et al [32] evaluated and confirmed an energy-efficient economy for microwave irradiation, using municipal wastewater sediments [32,33].…”

Analysis of Municipal Waste Development and Management in Self-Governing Regions of Slovakia

“…Wastewater also presents the city service problem. Vialková et al [46] found an effective method for the treatment with liquid waste. The research confirmed the energy-efficient economy of microwave irradiation using municipal wastewater sediments.…”