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1、AA大学“国家建设高水平大学公派研究生项目”研修计划Research Plan for CSC Scholarship Program, AA姓名/NameXxxxxxxxx学号/Student IDxxxxxx性别/GenderMale出生年月日/Date of birthXxxxxxxx所在学院/CollegeXxxxxxxxxxx所学专业/MajorXxxxxxxxxx国内导师/Domestic supervisor Xxxxxxxx留学国别/Hosting foreign country Xxxxx留学院校/Hosting foreign institution Xxxxxxxx留学院
2、系/Hosting faculty or department Xxxxxxxxx国外导师/Hosting foreign supervisor Xxxxxx学习期限/Duration of study xxx months (from xxxxx to xxxxx) 研究课题名称 Research Title:Minimization of energy requirement for producing solid fuel from sewage sludge employing hydrothermal treatment科研课题背景介绍Research Background:In C
3、hina, over 1.58107 tons of dewatered sewage sludge, with 80% water content, was generated from wastewater treatment plant in 2008. About 60% of the organic substances, removed during the wastewater treatment process, become concentrated as sludge. Traditional disposal methods used by municipal solid
4、 waste treatment facilities, including landfills, composting, and incineration, are unsuitable for sludge disposal because of its high moisture content. Few proper sludge treatments or disposal methods are currently applied in China. The treatment and disposal of sewage sludge are significant enviro
5、nmental problems and have therefore become a major focus of current environmental protection policies. Sludge incineration has received worldwide attention as an effective approach to reduce the quantity and toxicity of sludge. In Japan, most of burnable wastes are incinerated. However, direct sludg
6、e incineration is not cost-efficient and creates unstable burning which generates large amounts of gaseous pollutants. Currently, bio-energy is an excellent energy recycling technology with bright prospect, given its ability to turn refuse into energy. As such, in recent years refuse-derived fuel (R
7、DF) technology has become a refuse processing technology adopted by advanced nations in Europe, America, and Japan etc. In China, sewage sludge was mixed with auxiliary fuels, sulfur-fixating agents, and preservatives. The blends were granulated generating sludge-derived fuel (traditional SDF, T-SDF
8、). Most researchers focused mainly on the T-SDF technology and have made important contribution to understand the combustion characteristics of T-SDF. However, all these technologies relied mainly on adding a large number of coals (about 50%) to improve the heat value and lower the moisture content
9、of fuels. The heat value of T-SDF depends merely on the quantity and proportion of auxiliary fuels, not the reduction of water content of sludge. In some extent, this process realizes sludge recycling and harmless treatment. However, the volume and weight of T-SDF are also increased, resulting in in
10、crease of operating cost. Moreover, the small proportion (about 40%) of sludge in the T-SDF leads to a lower capacity that cannot meet the needs of sludge treatment. Therefore, it is urgent for us to find a cost-effective and energy-saving way to realize sludge recycling, harmless treatment and redu
11、ction.The core issue to produce solid fuel from sewage sludge is how to efficiently remove the water from sludge. The object of this project is to minimize the energy requirements for producing cost-effective and applicable solid fuel from sewage sludge. Hydrothermal treatment (or thermal hydrolysis
12、) is a process in which the sludge is heated as an aqueous phase to temperatures (normally) varying between 120 and about 400C. The hydrothermal treatment process aims to disintegrate the sludge and result in a formation and accumulation of dissolved products. This makes it possible to recover and r
13、ecycle useful resources from the sludge, such as volatile fatty acids, phosphorous compounds, organic compounds for enhanced anaerobic biogas production, and coagulants. After hydrothermal treatment, the sludge and other waste biomass can be dehydrated by mechanical methods and dried under natural c
14、ircumstances easily, used as substituted fuel which we called it novel sludge-derived fuel (N-SDF) in this research. His research will study the influence of hydrothermal conditions on natural drying characteristics of sewage sludge and other waste biomass, the drying mechanisms of hydrothermal trea
15、tment sludge and waste biomass. This research will not only drive the development of sludge treatment technologies but also lend a hand to other waste biomass treatment.In previous studies, we found that the N-SDF produced from sewage sludge by employing the hydrothermal treatment is easier when dry
16、ing under natural circumstances. After 24h natural drying, about 50% water was removed. Comparing with raw sludge, the drying is faster. Obviously, the heat value of N-SDF can be improved further, which increase the stability of combustion. However, some factors are still unclear and needed to be studied further, limiting its popularization and applications. Therefore, it is necessary to conduct this research. xxxxxx
