Sludge drying and incineration technology for municipal wastewater treatment plants

Thread Content

Technical Name: Sludge Drying and Incineration Technology for Urban Sewage Treatment Plants
Technical Content: (1) This technology combines atomized drying with rotary incineration; the dehydrated sludge, which has been ground, crushed, and pressurized into a mist form, is dried directly by high-temperature incineration flue gases before being fully burned in the rotary incinerator. The sludge volume reduction rate is ≥95%, with over 99% of the organic matter in the sludge being incinerated. The flue gases emitted undergo bag filtration, acid removal in spray towers, and biological deodorization, ensuring that they meet the \"Standards for Pollution Control from Domestic Waste Incineration\" (GB18485-2001). A project with a daily processing capacity of 50 tons of dewatered sludge (with a moisture content of 80%) requires an investment of 3.5 million yuan, and the operating cost per ton is 180 yuan. (2) This technology feeds sludge with a moisture content of approximately 75–85% directly into a circulating fluidized bed boiler for combustion, with the proportion of peat used as a co-fuel being around 20%–30%. After dust removal of the flue gas, the dioxin concentration measured is <0.004 ITEQng/m3 ； The levels of lead, cadmium, and mercury are respectively less than 0.155 mg/Nm3, 0.0035 mg/Nm3, and 0.004 mg/Nm3, meeting the relevant requirements of the \"Emission Standards for Air Pollutants from Boilers\" (GB13271-2001) and the \"Pollution Control Standards for Waste Incineration\" (GB18485-2001). The modification cost for a circulating fluidized bed boiler (20 t/h) capable of incinerating 1 t of sludge per hour is approximately 25,000 yuan per t of sludge, while the direct operating cost of sludge incineration is around 63 yuan per t. Application scope: Sludge disposal in municipal sewage treatment plants