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随着城市的发展,污水量的增加,市政污泥产量越来越大,污泥的处理已经成为影响到城市发展的重要环境问题之一。某污水厂采用离心脱水+低温干化工艺,实现了污泥含水率从97%~98.5%降到含水率30%~40%(含水率可调)。处理后的污泥运至发电厂进行掺烧。实现污泥的减量化、稳定化,无害化、资源化。污泥低温干化工艺主要由污泥脱水系统、污泥低温干化系统、污泥储运系统、冷却循环系统、除臭系统组成。本文主要介绍整个系统工艺设计及其运行情况总结。 相似文献
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介绍基于低温真空脱水干化一体化技术装备的污泥脱水干化减量系统解决方案。与传统的污泥脱水+干化"两段式"工艺相比,该技术方案进行了全面创新,攻克了污泥等物料脱水干化一体化技术难题,可将污泥含水率由90%~99%一次性降至30%以下,具有技术领先、功能完善、安全可靠、环境友好、智慧高效等特点与优势,符合污泥处理处置的发展趋势和发展方向,有良好的推广应用价值。 相似文献
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按照IPCC提供的计算方法,选取符合我国国情的排放因子,以污水厂浓缩污泥为起点,比较了3种污泥处理处置技术路线(深度脱水+填埋、脱水+干化焚烧+填埋/建材利用、厌氧消化+脱水+干化焚烧+填埋/建材利用)的碳排放强度,从碳减排的角度提出了最优选污泥处理处置的全流程技术路线。研究结果表明,浓缩污泥VS含量在50%~65%时,从污泥处理处置全流程看,深度脱水+填埋路线是高碳排放处理处置方式,且会产生二次污染,应尽量避免;脱水+干化焚烧+填埋/建材利用和厌氧消化+脱水+干化焚烧+填埋/建材利用路线的碳排放强度仅为深度脱水+填埋碳排放的约20%,且后者略低。研究认为,浓缩污泥经过厌氧消化后干化焚烧,残留的焚烧飞灰建材利用是最佳的碳减排处理处置技术路线,且当浓缩污泥VS含量和污泥脱水后含水率达到一定要求时,可以实现污泥处理处置全流程碳中和,应加快推广应用。 相似文献
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碳足迹分析是目前国际上常用的技术能耗评估和资源优化配置的方法.文中采用IPCC《国家温室气体清单指南》提供的方法,对干化-焚烧、深度脱水-干化-焚烧、厌氧消化-深度脱水-干化-焚烧3种基于焚烧的污泥处理处置技术路线进行碳足迹分析.结果表明,污泥干化-焚烧技术路线净碳排放量最低.厌氧消化虽然是污泥资源化利用的重要方式,但由于我国污泥有机质偏低,污泥单独厌氧产气率低,沼气利用产生的能量不足以弥补该过程的消耗.污泥干化和脱水环节产生的碳排放量较大,因此,优化热源、减少药剂使用可以实现碳减排;另一方面,推行污泥与城市有机固废高效协同厌氧,提高沼气产率,增加碳汇,也可以减少总的碳排放量. 相似文献
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广州鳌头污水处理厂工程处理规模为2×10~4 m~3/d,设计污泥量为120 m~3/d(含水率为98%)。采用污泥低温真空干化工艺处理剩余污泥,污泥含水率由98%降至40%以下,极大地降低了后期的污泥运输与处置费用。文中介绍该工程污泥干化工艺的比选、原理和特点,详细阐述污泥干化系统组成、车间布置、设备选型、技术经济指标等设计要点,为其他类似工程的设计提供参考。 相似文献
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干燥机用发电厂锅炉尾气余热对城市污泥干化处理的应用 总被引:1,自引:0,他引:1
采用干燥机设备嵌入到发电厂锅炉烟道尾气处置系统,利用发电厂锅炉烟道尾气余热,对城市污泥进行干化脱水,干化脱水后的污泥与煤按10∶3的比例混合后,一同进入发电厂锅炉焚烧发电。同时,对污泥无害化处理和资源化再利用,实现对生态环境的保护。 相似文献
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高水分玉米真空低温干燥工艺生产性试验研究 总被引:4,自引:0,他引:4
东北是我国玉米的主产区,产量占全国的30%~40%。受自然条件的影响,玉米收获水分常达22%~30%;成熟度及含水率都不均匀。根据玉米热敏性物料干燥的热特性及市场要求,考虑到它的热稳定性及破碎敏感性的特点,采用真空低温干燥技术进行了生产性试验,设计了300t/d高水分玉米真空低温连续干燥工业自动化生产线,对生产性试验关键技术进行了分析和研究。依据试验结果,分析玉米含水率、干燥介质温度、真空度、玉米温度、干燥时间、汽化蒸发温度等参数之间的联系与相互作用。生产试验表明:玉米含水率在24%时,维持干燥塔内真空度,采用高温水加热,汽化蒸发温度40~43℃,一次降水幅度达到10%~15%,保证了玉米品质的色、香、味、形及营养成分,具有干燥品质好、降水速度快、产量高、能耗低、操作方便、经济性价比高等优点。 相似文献
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我国每年污泥总产量逐渐增加,在其处理过程中普遍对含水率要求较高。采用热泵技术进行污泥低温干化,是一种既节能高效又不受地域限制的方法。但由于污泥的低温热干化特性尚不清楚,本文将通过在恒温恒湿箱中分别控制温度和污泥粒径两个单一变量,探究低温下二者对干化速率的影响,用曲线拟合得到直观的变化规律;并使用自主设计的立式污泥干化台架,对比探究铁-钙-碳基调理污泥在低温干化和传统干化下的水分释放特性。结果表明即使在60~80℃下,干化速率随温度升高仍然明显加快,干化时间缩短量与温度升高量满足递减的2次拟合多项式;而干化时间随污泥颗粒质量的变化满足递增的3次拟合多项式,所得拟合关系式适用于多种污泥;铁-钙-碳基调理剂可以显著提高污泥干化性能,稻壳和CaO会增加污泥孔隙和热导率,且稻壳在低温干化前期效果更明显。 相似文献
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SLUDGE DEWATERING AND DRYING 总被引:9,自引:0,他引:9
The production of wastewater treatment sludge, the basic characteristics of the sludge and the state of the water in the sludge are described in this paper. The methods for the determination of bound water content are discussed. The literature (including patents) on sludge dewatering and drying is reviewed, including vacuum filters, belt presses, centrifuges, direct dryers, indirect dryers and combined mode drying systems. The issues related to drying are briefly discussed. Photographs or schematics of typical dewatering and drying systems are also included. 相似文献
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市政污泥资源化处理工程实例 总被引:1,自引:1,他引:0
结合某市的市政污泥资源化处理项目,介绍市政污泥高温热水解、厌氧消化、脱水和余热干化的工艺流程和主要装置;介绍了项目工艺方案、工艺参数和技术特点,以及该项目的污泥资源化处理效果;同时介绍了处理后的市政污泥制造生物质燃料和生物炭土的资源化利用方案。 相似文献
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Yoshinori Itaya Nobusuke Kobayashi Lianlin Li Akira Suami Masakazu Sawai Hisashi Hamabe 《Drying Technology》2015,33(9):1029-1038
An innovative technology for sewage treatment systems is proposed. A mixture of sewage sludge and char particle is subjected to drying in the progress of composting in an updraft column. Exothermic heat generated during composting is utilized for energy of sludge drying. The char particle in the mixture contributes to enhancement of composting and drying rate. This study presents drying and composting behaviors of sludge to examine the effect of char addition. A fundamental drying experiment was carried out by hot-air heating of the sample in a small vessel. The drying characteristic curve for a mixture of sludge and char was greater than the sample of only sludge over a whole period if the drying rates were compared with the same moisture content. The drying behavior could be analyzed with a reasonable agreement by the water front receding model. The enhancement effect of drying and composting of sludge by char addition was confirmed by examination using a pilot scale of the updraft column whose volume was 50 m3. Sludge with 400% dry base (80% wet base) in moisture content could be dried successfully to lower moisture content than 67% dry base (40% wet base) only by exothermic heat during composting without supplying any auxiliary energy from the outside, and the treatment time was reduced by mixing char in sludge. The behavior was analyzed with a satisfactory agreement by a theoretical model employing moisture diffusion parameters determined from the drying characteristic curve. 相似文献
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William T. Simpson 《Drying Technology》1983,2(2):235-264
This paper reviews the technology of wood drying and recent developments in the field. The importance of drying is reviewed first. Then the fundamentals of wood properties as they relate to drying are discussed, including how water is held in wood, how it moves through wood, and how drying stresses that lead to drying defects develop. Traditional drying technology for lumber, veneer, and heavy timbers is then presented. With this background, the discussion moves to recent developments in drying technology that have been implemented commercially, such as high-temperature drying, low-temperature drying, continuously rising temperature drying, vacuum drying, and advances in process control. Finally, a discussion is presented on drying technology of the future. This topic describes processes that offer potential improvements in drying technology, but are still in the research and development stage. 相似文献
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William T. Simpson 《Drying Technology》2013,31(2):235-264
ABSTRACT This paper reviews the technology of wood drying and recent developments in the field. The importance of drying is reviewed first. Then the fundamentals of wood properties as they relate to drying are discussed, including how water is held in wood, how it moves through wood, and how drying stresses that lead to drying defects develop. Traditional drying technology for lumber, veneer, and heavy timbers is then presented. With this background, the discussion moves to recent developments in drying technology that have been implemented commercially, such as high-temperature drying, low-temperature drying, continuously rising temperature drying, vacuum drying, and advances in process control. Finally, a discussion is presented on drying technology of the future. This topic describes processes that offer potential improvements in drying technology, but are still in the research and development stage. 相似文献