Особливості сушіння мулових відкладень стічних вод за допомоги енергії довкілля

Abstract

Analysis of sludge deposits formed during wastewater treatment gives grounds to evaluate them as a valuable raw material for obtaining biomineral fertilizers. Researcher’s efforts are focused on finding new innovative technical solutions and environmentally friendly approaches in order to make these technologies economically viable. The purpose of this study is to obtain reliable experimental data that will form the basis for a multi-stage technology for the disposal of sludge deposits. A method of combined drying is proposed, in which both the energy of the environment (solar energy) and the energy of secondary energy resources: the heat removed by the cooler from the gasification chambers and the enthalpy of the exhaust gases of gas piston engines - are simultaneously used. The real installation is equipped with a "warm floor" of pipes, in the inner space of which heated circulating water circulates from the cooling system of gas generators. In the experimental setup, the "warm floor" is modeled using a special flat, controlled electric heater. Experiments carried out with a round-the-clock supply of heat from circulating water at a temperature of 40 °C indicate that the use of a "warm floor" can increase the specific amount of moisture removed from the material during the day, almost twice. When constructing a pilot industrial dryer, it is advisable to equip it with a "warm floor" with an additional source of thermal energy, which can be used as the heat of the ground, as well as the heat of high-temperature exhaust gases of an internal combustion engine.