Research On Heavy Metal Distribution From Municipal Solid Waste Incineration

Having the advantages of remarkable Volume-reduction, Weight-reduction and Energy-recovery, disposing of Municipal Solid Waste (MSW) by incinerations have been widely used abroad during the past twenty years. Nowadays this technology is being popularized gradually in our country. However, the adverse effect of this method is that it might cause secondary pollution, one of which is Heavy Metal. Because of the reason that Heavy Metal can neither created nor destroyed during incineration, the total amount summed from the final distribution of bottom ash, fly ash and flue gases is usually the same as that concentrated in raw refuse, therefore, if not be disposed properly, it will finally cause damage to environment.Researches on Heavy Metal distribution from MSW incineration are scheduled to be processed with five periods, In order to determine the Heavy Metals concentrated in the final incineration products correctly, efficiently and conveniently, this paper first established a series of standard for Sampling, Preparing and Analyzing the MSW according to the methods and rules adopted by others. Based on these, some typical groups of MSW were collected and analyzed.This paper analyzed the Heavy Metal concentrations, distributions and particle size effects on these ashes sampled systematically from No. 1 Incinerators of Yuhang Power Plant such as band-pass collected ash, scrubber ash. Different distribution characteristics among the ashes from combustion of coal, MSW and co-firing MSW and coal were compared at the same time.The distribution of heavy metals from MSW incinerators under different circumstances and effects of adding absorbents on the distribution had been researched. The results indicated that adding absorption can reduce the emissions of heavy metal elements.Investigate the effects of temperature, organic chloride and inorganic chloride in waste on the partitioning of heavy metals during MSW incineration was studied using a laboratory tube furnace. The results indicated that an increase in the chloride content and combustion temperature might increase the volatility of heavy metals and/or their compounds in the wastes, thus, increasing metal partitioning in the fly ash or the flue gases.