Method for cooperative reclaiming flyash and sludge in refuse incineration

Abstract

The invention relates to a method for fly ash and sludge disposal resource utilization from refuse incineration, which belongs to the environmental engineering technique field. The method adopts the following processes: fly ashes and sludge are mixed in proportion of 1: 10-1: 50 under the normal temperature, wherein the mass unit of fly ashes is gram and the volume unit of sludge is milliliter, proper heavy metal stabilizer is added to the mixture for fully mixing and agitation for fifteen to thirty minutes, and the control range of the pH value is between 9 and 12. The fly ash and sludge mixture can be obtained by washing, pressure filtration and drying. The water content of the sludge is reduced, the heat value is increased and the chloride ion content in the fly ashes is reduced through the synergistic disposal. The treated fly ash and sludge mixture can meet the material requirements of the cement production, thereby realizing the fly ash / sludge synergistic resource utilization.

Description

technical field [0001] The invention relates to a resource recovery method for the co-processing of waste incineration fly ash and sludge, which belongs to the technical field of environmental engineering. Background technique [0002] The current annual output of fly ash from domestic waste incineration in Shanghai is more than 20,000 tons. Waste incineration fly ash is rich in heavy metals and some organic dioxins, which are classified as hazardous waste. How to dispose and utilize waste incineration ash has become a major problem to be solved in the pollution control of domestic waste incineration. At present, most countries use the stabilized landfill method to deal with fly ash, but the capacity of fly ash after solidification increases greatly. With the decrease of landfill capacity relative to the increase of fly ash, it cannot absorb fly ash. Many countries and regions are looking for Fly ash resource utilization approach. At present, fly ash can be recycled mainl...

AI Technical Summary

Problems solved by technology

The main methods of sludge treatment and disposal at home and abroad are sanitary landfill, sludge agricultural use and sludge incineration. In my country, landfill and agricultural use are mainly used. With the increase of sludge volume, various sludge landfill disposal sites in Shanghai are also It tends to be saturated, and some toxic substances such as heavy metals in urban sludge exceed the standard, which also restricts agricultural use

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