Effect of Pre-melting Operation on the Vaporization Behavior of Phosphorus from Incinerator Ash of Sewage Sludge

摘要

Incineration of sewage sludge waste is the most cost effective thermochemical method of pre-treatment before disposal due to a large reduction in disposal volume, thermal destruction of toxic organics and the utilization of the energy in organic material in the sludge. The need to develop comprehensive incineration processes has been prompted by the scarcity of disposal space and the risk of environmental pollution associated with the untreated sewage sludge waste. However, phosphorus and other volatile elements vaporize and accrete to the furnace lining resulting in the corrosion attack of refractories during the incineration process.~(1)) Therefore, it is important to clarify the mechanism of phosphorus vaporization from the sewage sludge ash in order to reduce refractories corrosion attack by phosphorus accretion and to improve the process performance of the incineration process. The main objective of this investigation is to evaluate effects of pre-melting operation on the vaporization behavior of phosphorus from standard and Fe_2O_3-added incinerator ash of sewage sludge.