污泥好氧发酵过程中热解特性变化研究

发布时间：2019-08-03 15:53

【摘要】：选用脱水污泥和木块进行好氧发酵,采用热重分析仪对污泥好氧发酵过程中不同阶段的污泥进行热重分析,研究不同阶段污泥热解特性的变化,并为探索污泥好氧发酵过程中有机质的变化规律提供参考。结果表明,污泥热解过程可分为4个阶段,分别为:水分析出阶段(T1)、挥发性有机物析出转化阶段(T2)、大分子有机物转化析出阶段(T3)和矿物质分解阶段(T4)。其中挥发性有机物析出转化阶段和大分子有机物转化析出阶段为失重的主要阶段。随着发酵时间的延长,污泥的最大失重率逐渐减小。发酵第1、4、7、10、13、16天,污泥最大失重率分别为51.14%、43.50%、43.18%、39.79%、35.72%、35.46%。当堆体处于升温期时,污泥样品挥发性有机物析出转化阶段及大分子有机物转化析出阶段失重率变化较大,分别减少2.11%和4.13%;堆体温度维持在40℃左右时,污泥样品大分子有机物转化析出阶段失重率变化较大,3 d内减少了4.68%。第13天与第16天污泥样品总失重率仅相差0.22%,好氧发酵在第13天已接近结束。不同发酵阶段污泥样品均以大分子有机物转化析出阶段失重率为最大,挥发性有机物析出转化阶段次之,矿物质分解阶段最小。有机质降解主要发生在发酵第1~4天和第7~10天,其中第1~4天污泥中挥发性有机物和大分子有机物均有显著降解,第7~10天以大分子有机物降解为主。
[Abstract]:Dehydrated sludge and wood block were selected for aerobic fermentation, and thermogravimetric analysis (TGA) was used to analyze the pyrolysis characteristics of sludge in different stages of aerobic fermentation. The changes of pyrolysis characteristics of sludge in different stages were studied, and the reference was provided for exploring the change law of organic matter in aerobic fermentation of sludge. The results show that the pyrolysis process of sludge can be divided into four stages: water analysis stage (T1), volatile organic matter precipitation and transformation stage (T2), macromolecular organic matter transformation precipitation stage (T3) and mineral decomposition stage (T4). Among them, the precipitation and transformation stage of volatile organic compounds and the precipitation stage of macromolecular organic compounds are the main stages of weightlessness. With the prolongation of fermentation time, the maximum weight loss rate of sludge decreased gradually. On the 1st, 4th, 7th, 10th and 16th day, the maximum weight loss rate of sludge was 51.14%, 43.50%, 43.18%, 39.79%, 35.72% and 35.46%, respectively. the maximum weight loss rate of sludge was 51.14%, 43.50%, 43.18%, 39.79%, 35.72% and 35.46%, respectively. When the reactor body is in the warm stage, the weight loss rate of the sludge sample in the precipitation and transformation stage and the macromolecular organic matter transformation stage change greatly, which decreases by 2.11% and 4.13%, respectively, and the weight loss rate in the macromolecular organic matter transformation and precipitation stage of the sludge sample changes greatly when the reactor temperature is maintained at about 40 鈩，

本文编号：2522650