Sludge pyrolysis and carbonization
Sludge is rich in nutrients such as organic matter, nitrogen, phosphorus, and potassium that cause water pollution. It also contains a large number of pathogenic microorganisms, which are prone to decay and odor. Improper disposal can cause serious environmental pollution and ecological damage, as well as a great waste of resources. At present, the main methods of sludge disposal currently used domestically and internationally include landfill, composting, incineration, pyrolysis, etc. Landfill technology has low costs, but it occupies a large area, contains a lot of landfill gas and leachate, and is difficult to treat. Anaerobic digestion technology can recover energy substances, but its operation and management are difficult. The incineration technology has significant capacity reduction effects, and the calorific value of sludge can be utilized, but the operating cost is high and there is a problem of secondary air pollution. In recent years, pyrolysis has received increasing attention as an alternative technology for incineration.
Shangding Environmental Technology (Jiangsu) Co., Ltd. is committed to environmental protection and environmental engineering industry, the technology research and development team of the international advanced technology digestion and re-innovation, cooperation with domestic and foreign equipment manufacturers, the formation of its own core equipment- Multiple Hearth Furnace (MHF). MHF is used in the sludge pyrolysis and incineration, comprehensive utilization of biomass resources, mineral roasting, electronic waste pyrolysis and recycling, activated carbon carbonization/activation, activated carbon regeneration, activated carbon application (biological fermentation product decolorization/ wastewater treatment, etc.) and other fields, master more than 30 corresponding patents, more than 80 sets of MHF engineering experience.
The significant characteristics of pyrolysis technology are as follows:
-
Green, no secondary pollution.
-
High energy utilization rate, high capacity reduction rate, and low operating costs.
-
Solidify heavy metals.
-
No production of dioxins and furans.
-
Low smoke emissions and low heat loss.
-
Recycling renewable energy, CO2 reduction, CDM benefits.
The pyrolysis residue is completely inert, loose, and dry, rich in potassium and phosphorus, and has great potential for utilization. The physical structure allows it to be used as an additive in asphalt production; The low content of harmful substances and stiffness can be used to fill underground holes; Rich in inorganic substances, it can be used as bottom filling material in land reclamation; The high phosphorus content can be used in fertilizer production to replace phosphate rock collected from mines, achieving significant carbon dioxide reduction. Easy to store, transport, and use, it provides an effective way for sludge reduction, stabilization, harmless treatment, and resource utilization.
Comparison of pyrolysis furnace
Pyrolysis Rate
Multiple Hearth Furnace
Rotary Kiln
Fluidized Bed
slow
slow
fast
Drying and Pyrolysis Process
segmented
segmented
simultaneously
Layered Control of Temperature and Atmosphere
easily
indistinct
hard
Indirect Heating
hard
hard
easy
Oxygen Control
easy
hard
hard
Self-heat Equilibrium
yes
yes
no
Power Requirement
low
low
high
Operation Mode
many
less
less
Amount of Ash
less
less
large
Syngas Outlet Temperature
low
low
high
Furnace Construction
complex
complex
simple
Area Covered
small
large
small
Sludge pyrolysis project
1.Chengde Luanping sewage treatment plant: 10 t/d municipal sludge pyrolysis project.Operating cost <260 yuan/ton
2.Jiangmen Huahao Environmental Technology Co., Ltd.: 80 t/d sludge pyrolysis project
Introducing RTO as exhaust gas treatment equipment greatly saves fuel for exhaust gas treatment. Operating cost <150 yuan/ton
