污泥螺旋浓缩电渗透带式振动压榨一体化高干度脱水技术的研究
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摘要
目前,通用的污泥脱水方法,脱水后的滤饼含水率通常在75%～80%左右,高含水率的滤饼不但不利于运输、堆放,而且会给其后续处理带来一定困难,因此,城市污泥高干度脱水技术的研究就变的十分重要了。
本课题通过对国内外相关污泥脱水技术的研究,在总结先进污泥脱水技术的基础上,针对滤饼高含水率的原因是胞内水如何释放以及高干度压榨脱水问题,本着经济高效地对污泥进行脱水的原则,提出了“污泥螺旋浓缩电渗透带式振动压榨一体化高干度脱水技术”的研究课题。本文通过研究,首先构建了“污泥螺旋浓缩电渗带式振动压榨过滤脱水模型”;在理论研究的基础上,进行了试验研究,通过试验研究对系统工艺参数进一步优化,初步证明了该方法能够较好的对污泥进行经济、高效、高干度脱水。本文主要研究内容如下:
第一章绪论。首先阐述了课题来源及研究意义,通过对国内外污泥高干度脱水技术的研究,重点探讨了电渗透脱水技术和带式压榨脱水技术的研究现状和存在问题。通过分析,提出了采用“污泥螺旋浓缩电渗透带式振动压榨一体化高干度脱水的方法”,对污泥进行高干度脱水,进一步确立了本课题主要研究内容。
第二章方案设计。本章根据课题要求,先后设计了三种“污泥高干度脱水”工艺方案,通过比较分析,以经济高效地对污泥进行脱水的原则,最后确立了一种经济、高效、高干度脱水的工艺方案。
第三章“污泥高干度脱水模型”的构建。依据确立的“工艺方案”,根据带式压榨过滤和电渗透脱水理论,通过研究,首先从理论上分析了脱水过程中电渗透、带式压榨以及振动压榨等对污泥脱水效果的影响,最终构建了污泥螺旋浓缩电渗透带式振动压榨过滤脱水模型。
第四章仿真分析。根据所构建的“污泥脱水模型”,然后采用仿真分析软件ADINA对其进行数值仿真。仿真分析结果表明:污泥在电场作用下,其滤液量明显增加(表明胞内水被释放出来了),同时,滤液流速也加快,滤饼含水率显著降低;在振动压榨力作用下滤饼含水率降到较低值(表明污泥中的游离水也得到了进一步降低)。
第五章试验研究。为了进一步验证该理论方法的真实性、可行性,本课题进行了环境试验,通过试验分别对电极材料、电场强度、压榨力、振动频率、振幅等对污泥脱水效果的影响进行了较为深入的研究,并对系统工艺参数进一步优化,试验证明,当进料浓度含水率93~97%,作用电场强度(6~10V/mm)之间,脱水时间(2~3min)之间,滤带压榨作用力(0.6~0.8MPa),振动频率1000Hz,振幅2~5mm,滤饼含水率在65%~60%之间。
第六章总结。本章主要是对本文所做的工作进行回顾和总结以及论文主要创新点,探讨了论文存在的问题及该课题今后研究方向等。
本文主要创新点:
⑴率先提出了一种污泥高干度脱水新技术——污泥螺旋浓缩电渗透带式振动压榨脱水技术。
⑵构建污泥螺旋浓缩电渗透带式振动压榨过滤脱水模型。
⑶对传统带式污泥脱水机进行了改进(增加了螺旋浓缩、电渗透、振动压榨装置),对其进行了环境试验,通过试验对相关参数进行了参数优化,为该技术的实际应用奠定了试验基础。
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 dehydration
Chapter 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.
本课题通过对国内外相关污泥脱水技术的研究,在总结先进污泥脱水技术的基础上,针对滤饼高含水率的原因是胞内水如何释放以及高干度压榨脱水问题,本着经济高效地对污泥进行脱水的原则,提出了“污泥螺旋浓缩电渗透带式振动压榨一体化高干度脱水技术”的研究课题。本文通过研究,首先构建了“污泥螺旋浓缩电渗带式振动压榨过滤脱水模型”;在理论研究的基础上,进行了试验研究,通过试验研究对系统工艺参数进一步优化,初步证明了该方法能够较好的对污泥进行经济、高效、高干度脱水。本文主要研究内容如下:
第一章绪论。首先阐述了课题来源及研究意义,通过对国内外污泥高干度脱水技术的研究,重点探讨了电渗透脱水技术和带式压榨脱水技术的研究现状和存在问题。通过分析,提出了采用“污泥螺旋浓缩电渗透带式振动压榨一体化高干度脱水的方法”,对污泥进行高干度脱水,进一步确立了本课题主要研究内容。
第二章方案设计。本章根据课题要求,先后设计了三种“污泥高干度脱水”工艺方案,通过比较分析,以经济高效地对污泥进行脱水的原则,最后确立了一种经济、高效、高干度脱水的工艺方案。
第三章“污泥高干度脱水模型”的构建。依据确立的“工艺方案”,根据带式压榨过滤和电渗透脱水理论,通过研究,首先从理论上分析了脱水过程中电渗透、带式压榨以及振动压榨等对污泥脱水效果的影响,最终构建了污泥螺旋浓缩电渗透带式振动压榨过滤脱水模型。
第四章仿真分析。根据所构建的“污泥脱水模型”,然后采用仿真分析软件ADINA对其进行数值仿真。仿真分析结果表明:污泥在电场作用下,其滤液量明显增加(表明胞内水被释放出来了),同时,滤液流速也加快,滤饼含水率显著降低;在振动压榨力作用下滤饼含水率降到较低值(表明污泥中的游离水也得到了进一步降低)。
第五章试验研究。为了进一步验证该理论方法的真实性、可行性,本课题进行了环境试验,通过试验分别对电极材料、电场强度、压榨力、振动频率、振幅等对污泥脱水效果的影响进行了较为深入的研究,并对系统工艺参数进一步优化,试验证明,当进料浓度含水率93~97%,作用电场强度(6~10V/mm)之间,脱水时间(2~3min)之间,滤带压榨作用力(0.6~0.8MPa),振动频率1000Hz,振幅2~5mm,滤饼含水率在65%~60%之间。
第六章总结。本章主要是对本文所做的工作进行回顾和总结以及论文主要创新点,探讨了论文存在的问题及该课题今后研究方向等。
本文主要创新点:
⑴率先提出了一种污泥高干度脱水新技术——污泥螺旋浓缩电渗透带式振动压榨脱水技术。
⑵构建污泥螺旋浓缩电渗透带式振动压榨过滤脱水模型。
⑶对传统带式污泥脱水机进行了改进(增加了螺旋浓缩、电渗透、振动压榨装置),对其进行了环境试验,通过试验对相关参数进行了参数优化,为该技术的实际应用奠定了试验基础。
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 dehydration
Chapter 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.
引文
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[3] Guohua Chen,Po Lock Yue,Arun S Mujumdar.Sludge dewatering and drying[J].Drying Technology,2002,20(4-5):883-916
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