Energy recovery from liquid wastes of a sewage-treatment plant

The process of combustion of the briquettes produced from compost of liquid wastes originating from a municipal sewage-treatment plant as a substitute or supplement for fossil fuel is presented. The experiments were carried o ut in a laboratory-scale combustion chamber which simulated a fixed-grate b oiler. The laboratory stand was equipped with apparatus enabling measuremen t of thermal parameters of the combustion process, as well as emission into the atmosphere of various components such as fly ash, nitrogen oxide, carb on oxide, sulfur dioxide, and heavy metals. It was established that the bri quettes can be used as fuel and that similar combustion and thermal conditi ons to combustion of brown coal were achieved with an essential benefit of lower air pollution.