The performance and environmental impact of the integrated Spray Drying and Incineration demonstration project for dying sludge treatment

摘要

In this paper, the running performance and its environmental impact of the integrated spray drying and incineration demonstration project were studied for more than 30 days and presented. With the process of industrial-scale installation (with capacity of 600t/d) for dying sludge treatment being in operation, the stability and reliability with high degree of automation in the long run time were observed. The spray drying tower, which was designed to dry the wet sludge by directly contacting with the high temperature gas, was specially monitored and found that it can keep running with high security, without dust explosion and harmful volatile organic gases released risks. The exhaust and smoke were also determined and results indicated that the pollutants were well-controlled to meet the related national standard (GB18485-2001) including sulfur dioxide, nitrogen oxides and hydrogen chloride as well as mercury and lead. Much attention should be paid to the dioxin that the emission concentration was even lower than that of the European Union Criteria. The most important for this technology is that there is no fly ash emitted. This is the distinguished difference from other incineration processes. Leaching test regarding incineration slag did not show as much pollution of heavy metal. All of the above showed that this technology had not much effect on environment and proved it successful application in China.