深井曝气法处理城市污水厂污泥中试试验研究

发布时间：2018-01-10 03:00

  本文关键词：深井曝气法处理城市污水厂污泥中试试验研究　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 深井曝气 曝气量 反应温度 VSS去除 污泥

【摘要】：我国的市政污泥产量庞大、成分复杂,其中有机物的高含量致使其极易腐败,产生恶臭,从而造成严重的环境二次污染。随着我国城市化进程的加快和污水处理率的提高,以及环保认识的深入,污泥的处理已成为我国环境保护中面临的日益紧迫和严峻的问题。深井曝气是利用潜置于地下的竖向反应器对污泥进行超深水好氧消化的一种高效活性污泥工艺,具有污泥VSS去除率高、污泥水力停留时间短的、病原菌灭活率高、占地使用面积小等优势,近年来备受国内污泥处理行业的关注。自上世纪七八十年代开始在欧美等城市得到推广和应用,我国目前还没有关于深井曝气法处理污泥工艺的工程应用实例。本课题组依托中国西北某污水处理厂设计建造的城市污水污泥深井曝气中试系统,分别采用批式和半连续运行方式,试验污泥深井曝气条件对系统中挥发性悬浮固体(VSS)、温度、pH、ORP、污泥比阻、DHA和病原菌等影响,探讨相关运行条件对深井反应器内温度提升、病原菌灭活、污泥脱水性能以及污泥VSS去除率的影响,以获得消化反应系统最适宜运行条件,力求通过该中试研究探讨在中国开展深井曝气处理城市污水厂污泥的可行性。研究结果表明:在曝气曝气量为1.5~1.8 L/(h?L污泥),进泥含水率在94.5~95.5%之间,进泥有机份含量为55~65%的运行条件下,深井曝气中试系统运行到第18d时一级反应区温度能达到50.8℃,温度升高有助于VSS去除率提高,病原菌在此温度条件下的灭活率能够达到百分之百,同时污泥脱水性能受高温影响较大;研究中发现适宜的曝气量能取得较好的去除效果,对于VSS浓度为38.5g/L的污泥曝气量取1.5~1.8 L/(h·L污泥)为宜,VSS的去除率可达到40.1%;除此之外,反应器中不仅有好氧菌,还存在厌氧菌和兼性菌,微氧环境更有利于VSS的降解,ORP最低为-256 mV;研究还发现反应体系COD与DHA呈下降趋势,高温好氧条件能使污泥不再具备生物活性能力同时促进COD消耗,进而实现污泥稳定的良好效果;污泥深井曝气中试系统并不是严格意义上的“自升温”,使其高温状态的部分热量来源于空压机所提供的压缩空气带来的热量。
[Abstract]:The production of municipal sludge in our country is huge and the composition is complex. The high content of organic matter makes it easy to corrupt and produce stench. With the acceleration of urbanization and the improvement of sewage treatment rate in China, as well as the in-depth understanding of environmental protection. The treatment of sludge has become an increasingly urgent and severe problem in environmental protection in our country. Deep well aeration is a highly efficient activated sludge process for ultraldepth aerobic digestion of sludge using vertical submerged reactor. . It has the advantages of high removal rate of sludge VSS, short hydraulic retention time of sludge, high inactivation rate of pathogenic bacteria, small area of use and so on. In recent years, sludge treatment industry has attracted much attention in China. Since 0th century, it has been popularized and applied in Europe and America. At present, there are no engineering application examples of deep well aeration process for sludge treatment in China. The pilot aeration test system for urban sewage sludge in deep well is designed and built by our team based on a sewage treatment plant in northwest China. The effects of sludge deep well aeration conditions on volatile suspended solids (VSS), pH value (pH = ORP), sludge specific resistance (DHA) and pathogenic bacteria were tested by batch and semi-continuous operation respectively. In order to obtain the most suitable operation conditions of digestion reaction system, the effects of operation conditions on temperature rise, pathogen inactivation, sludge dewatering performance and sludge VSS removal rate in deep well reactor were discussed. The feasibility of deep well aeration for sludge treatment of municipal wastewater treatment plant in China is explored through the pilot study. The results show that the aeration rate is 1.5 ~ (1.8) L / L ~ (-1) 路h ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1)? The water content of the sludge was 94.5% and the organic content of the sludge was 55 ~ 65%. The temperature of the first-order reaction zone can reach 50.8 鈩，

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