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Research on High Degree Dewatering of Sludge by Integrating Electroosmosis and Vibrating Belt Screw Condense

Author: LuoMin
Tutor: ZuoYanNian
School: Suzhou University
Course: Mechanical Engineering
Keywords: sludge scew electroosmosis belt filter high degree dehydrate by vibrating press
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 100
Quote: 0
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Abstract

Currently, the filter cake moisture of dewatered sludge is usually about 75% to 80% after using the traditional methods of dewatering filter. High moisture content filter cake is not only go against transportation and stacking, but also causes difficulties in future. Therefore,research on high degree dewatering of sludge is very important.The reason of high moisture content filter cake is how to release the bound water and the problem of high degree squeezing dehydration. Through studying high degree dehydration technology of home and abroad and summarizing the advanced technology of sludge dewatering, The Electroosmosis and Vibrating Belt Screw Condense method is introduced into the study of activated sludge dewatering based on the principles dewatered sludge economic and efficiency. This paper firstly builds“High Degree Dewatering of Sludge by Integrating Electroosmosis and Vibrating Belt Screw Condense”mathematics model for activated sludge. On the basis of theoretical study, experimental study was carried out. It initially proved that this method is economic and efficiency for dewatering sludge through optimizing the process parameters The main works of this thesis include the following aspects:Chapter One: First of all, it holds out topic source and research significance. Then, through studying high degree dehydration technology of home and abroad, this chapter mainly discusses the research status and existing problems of electroosmosis and vibrating belt condense.It proposes to adopt“Research on High Degree Dewatering of Sludge by Integrating Electroosmosis and Vibrating Belt Condense”to dewatering,and establishes the main research topics.Chapter Two: Design.According to the requirements of topic,this part designed three plans on "High Degree Dewatering of Sludge ". Through comparing the schemes, based on the principles dewatered sludge economic and efficiency, it finally established a process program which is economic、efficiency and high degrees dehydrationChapter Three: "High Degree Dewatering of Sludge" equation. According to the "process program", this section analyses the role of electroosmotic、pressure and vibrating pressure during dewatering sludge theoretically by coupling the theory of belt filter and electroosmosis. And ultimately, the mathematics model of“High Degree Dewatering of Sludge by Integrating Electroosmosis and Vibrating Belt Screw Condense”is constructed.Chapter Four: The Simulation Analysis. According to the mathematics model for activated sludge dewatering, the modal are carried on numerical simulation with the Automatic Dynamic Incremental Nonlinear Analysis software.Results show that: the quantity of filtrate in sludge is obviously increase than the filtrate without imposing electric field(show that the bound water is released in the sludge); Meanwhile, the velocity of filtrate also accelerate and filter cake of moisture content is significantly reduced; Filter cake moisture content dropped to a low value in vibration squeezing force function(show that the free water in sludge also got further reduced).Chapter Five: Test Research. In order to further validate the practicability of the theory of the combination of the electroosmosis and vibrating belt screw condense, an environmental experiment of high degree and economical sludge dehydration is introduced in this paper which has studied the electrode materials, field strength, belt pressure, vibration frequency, amplitude and the best dewatering time and made comparative analysis micro-structure of the sludge in the process of dewatering. The results show that: the cake moisture content(93~97%) was significantly lower (60~65%) when combing the method of electroosmosis and vibrating belt screw condense, the field strength is between (6~10V/mm), the best dewatering time is between (2~3min), and the belt pressure is between (0.6~0.8MPa), vibration frequency is 1000Hz, amplitude is between (2~5mm).Chapter Six:Summary. This chapter is mainly reviewed and summarized the work of this paper and innovations, then discusses the existing problems and the research orientation of the thesis topic in the future.The main innovations of this thesis include the following aspects: ⑴Take the lead in putting forward a new technology on high degrees dewatering of sludge——High Degree Dewatering of Sludge by Integrating Electroosmosis and Vibrating Belt Screw Condense.⑵The mathematics model of“High Degree Dewatering of Sludge by Integrating Electroosmosis and Vibrating Belt Screw Condense”is constructed.⑶Improving the traditional belt filter of dewatering sludge(add the devices of screw enrichment, electroosmosis and vibration squeezing).Environmental testing was carried out by testing the parameters of the relevant parameters optimized and it lays the experimental basis for the practical application of this technology.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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