Abstract
Sludge incineration is a sludge resource management and disposal method that can greatly decrease the volume of sludge, reduce the degree of harm and realize the recovery of sludge heat energy. Most of the research on sludge incineration focuses on the combustion process and gas emissions, but there are relatively few studies on the sludge fuel molding and drying process before sludge incineration. Besides, independent incineration of sludge has high energy consumption. This paper proposes a pre-incineration treatment method in which sludge and corn stover are mixed to make fuel pellets and then dried. Specifically, the influence of molding pressure, raw material ratio and raw material particle size on the physical properties of the fuel, and the related mechanism, were studied. The density of fuel particles is mainly affected by the forming pressure, and the impermeability is mainly determined by the proportion of sludge in the raw material. The order of the variables based on their effect of improving fuel physical properties was: molding pressure > raw material ratio > raw material particle size. Moreover, the influence of drying temperature (40 °C, 60 °C, 80 °C, 100 °C, 120 °C) has been explored. When the initial water content is similar, the drying rate increases with the increase in temperature. It provides a reference for the sludge fuel molding and drying process, and promotes the practical application of mixing sludge and corn stalks to make fuel.
Highlights
The annual output of sewage sludge in China is about 20 million tons [1] and, with economic development and population growth, the amount of sewage sludge continues to grow
The moisture content of sewage sludge after mechanical dehydration is still as high as 70–80%, which means it is unable to reach to the requirements of disposal methods such as landfill and incineration [4,5]
Electroosmotic municipal sludge and corn stalks are mixed to make fuel pellets, and the molding and drying characteristics of sludge-corn stover fuel pellets are studied. electro-osmosis dehydrated sludge and corn stalks were mixed, and high-pressure molding technology was used to prepare the fuel at room temperature
Summary
The annual output of sewage sludge in China is about 20 million tons [1] and, with economic development and population growth, the amount of sewage sludge continues to grow. The moisture content of sewage sludge after mechanical dehydration is still as high as 70–80%, which means it is unable to reach to the requirements of disposal methods such as landfill and incineration [4,5]. The study showed that when the sludge moisture content reaches 65%, the continued use of EDW technology for dehydration will cause a sharp increase in energy consumption [7]. The independent molding of biomass straw fuel requires high energy consumption. Electro-osmosis dehydrated sludge (moisture content 60–65%) and corn stalks (moisture content 12–15%) were mixed, and high-pressure molding technology was used to prepare the fuel at room temperature. Different from pure biomass fuel pellets, the addition of sludge reduces the energy consumption of molding. The sludge and corn stalks are pressed into fuel pellets to facilitate transportation and combustion
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
