污泥高温好氧堆肥工艺优化的研究

发布时间：2018-02-07 10:32

  本文关键词： 好氧堆肥 污泥 颗粒化生物调理剂 复合菌剂 通风方式　出处：《河南工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：污水厂剩余污泥的处理处置已成为一个影响环境的重要问题。堆肥因具有可将污泥转化为有价值的堆肥产品,且运行成本低的优点而应用前景广泛。但目前污泥堆肥存在堆肥周期长、存在恶臭气体、调理剂用量大等问题。为此,本课题基于多尺度调控理论,分别从颗粒化生物调理剂、复合微生物菌剂、正负压耦合通风的角度对污泥高温好氧堆肥工艺进行了优化研究,研究结果如下:1.颗粒化生物调理剂投加量优化。在污泥高温好氧堆肥过程中,颗粒化生物调理剂的最佳投加量为20%,在此投加量条件下,堆体快速升温,第2天已接近50℃高温,维持高温期最长,达到8天;有机质的含量由初始的59.8%降至47.4%;堆肥除湿效果较好,污泥堆肥化产物的最终含水率为48.4%;有保氮效果,可使堆体中的氨气保持在500ppm以下;最终污泥转化产物的C/N比初始污泥的大;堆体氧较高,不易产生H2S。且引起堆体pH值变化不大。2.复合微生物菌剂接种比例确定。污泥高温好氧堆肥过程中复合微生物菌剂最佳接种比例为5%,在此接种比例条件下,堆体快速加温,第3天已至59℃,高温期较长,为6天;污泥有机质降解较快,从初始的59.2%降至最终的51.7%;堆肥除湿效果较好,污泥堆肥化产物的最终含水率为58.3%,调理剂最终含水率为36.2%;堆体氨气在500ppm以下;最终污泥堆肥化产物的C/N比明显比初始污泥的低;堆体氧气含量经历先下降后上升的趋势,其硫化氢含量与氧气含量成负相关。但引起堆体pH值变化不大。3.通风方式的选择。污泥高温好氧堆肥最佳通风方式为先负压后正压的通风方式,在此通风方式条件下,堆体前期升温较快,比采用正压通风最高温度高6℃;有利于堆体中后期去除水分,污泥最终含水率较低,为53.5%,调理剂的最终含水率最低,为35.4%;有利于堆体有机质的降解,其最终含量最低,为40.4%;释放的氨气浓度低;最终污泥C/N比比原始污泥的高。但引起堆体pH值变化不大。
[Abstract]:The treatment and disposal of excess sludge in wastewater treatment plants has become an important problem affecting the environment. Composting has the ability to convert sludge into valuable composting products. However, sludge composting has many problems, such as long composting cycle, bad odor gas and large amount of conditioning agent. The optimization of sludge high temperature aerobic composting process was studied from the point of view of combined microbial agent, positive and negative pressure coupling ventilation. The results are as follows: 1. Optimizing the dosage of granulated biological conditioning agent in the process of sludge high temperature aerobic composting. The optimum dosage of granulated biological conditioning agent is 20. Under the condition of this dosage, the body of the reactor heats up rapidly, and on the second day it is close to 50 鈩，

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