Abstract
A method for safe use of large amounts of debris sludge yielded after a disaster was established. Since the debris sludge consists of colloidal organic matter, it is thought that malodorous gases are greatly generated by the decomposition of the organic matter. The debris sludge was comprised of a high content of colloidal organic matter. This is because, the colloidal organic matter adheres easily to silt and clay particles. It has been pointed out that organic substances can be classified based on the ignition behavior of the organic substances, i.e. unstable substances burn at low temperature (less than 350 degree Celsius) and humic substances burn at high temperature (370-600 degree Celsius). In this study, a method based on ignition behavior is proposed to identify the debris sludge which leads to a high risk of malodorous gas generation. Furthermore, a method for utilization of granulated coal ash is also proposed to suppress the generation of malodorous gases.
