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Fe-絮凝降阻法处理后的印染污泥燃烧特性
罗伟1, 樊军2, 郭开1, 李志光1, 周智1
1. 湖南农业大学理学院, 湖南 长沙 410128;2. 北京三态环境科技有限公司, 北京 100076
摘要:
为明确印染污泥焚烧特性,提高其处理效率.以Fe-絮凝降阻法深度处理的印染污泥为研究对象,通过TG-DTG热重曲线法研究不同干燥时间(1.5、2.0、2.5、3.0、3.5和4.0 h)对深度处理的印染污泥燃烧特性的影响,并对深度处理的印染污泥燃烧过程的动力学和失重速率进行拟合.结果表明:不同干燥时间下,深度处理的印染污泥的焚烧过程均可分为4个阶段,阶段1为水蒸发阶段(15.9~106.9℃),阶段2为低沸点有机物析出阶段(106.9~235.5℃),阶段3为挥发分的析出和燃烧阶段(235.5~479.0℃),阶段4为难挥发物质和碳酸盐分解阶段(479.0~852.2℃),污泥最大失重率均在410.0℃左右,最大失重均出现在阶段3.最佳干燥时间为2.0 h(含水率为3.60%),该条件下深度处理的印染污泥在阶段3失重峰值前、后分别为0.5级和2级反应,活化能分别为7.227和87.040 kJ/mol.失重峰值前、后的失重速率方程分别为y=9.003 18-0.099 68xR2=0.998 1)和y=5.576+2.105/{1+exp[(x-18.076)/1.349]}(R2=0.997 8).研究显示,深度处理的印染污泥主要在第3阶段燃烧,所得失重速率方程与其第3阶段燃烧的失重速率数据较好吻合.
关键词:  印染污泥  含水率  焚烧  热重分析  动力学
DOI:10.13198/j.issn.1001-6929.2017.03.62
分类号:X788
基金项目:国家自然科学基金项目(No.21176063)
Evaluation of Printing and Dyeing Sludge Pre-treated with the Iron Flocculation Resistance Reduction Method: Incineration Characteristics
LUO Wei1, FAN Jun2, GUO Kai1, LI Zhiguang1, ZHOU Zhi1
1. College of Science, Hunan Agricultural University, Changsha 410128, China;2. Beijing SANTAI Environment Technology Co., Ltd., Beijing 100076, China
Abstract:
Printing and dyeing sludge without any treatment might cause serious environmental pollutions. However, the treatment efficiency of printing and dyeing sludge is low. Fe-flocculated dyeing sludge burning has been proved as an excellent treatment approach, but the incineration characteristics is not clear and would affect the treatment efficiency. The influence of drying time on incineration characteristics of the textile dyeing sludges treated by Fe-flocculation reduction was studied by TG-DTG curve. The incineration was divided into four stages:moisture exhalation (15.9-106.9℃), low boiling point organic matter exhalation (106.9-235.5℃), escaping and combustion of volatile components (235.5-479.0℃), non-volatile matter and carbonate decomposition (479.0-852.2℃). In the investigation of 1.5, 2.0, 2.5, 3.0, 3.5 and 4.0 h drying time, the maximum weight loss rate of sludge was about 410.0℃, and it was in the third stage. The optimum drying time was 2.0 h (moisture content reaches 3.60%), which was in the third stage of the maximum weightlessness stage:the activation energy of the reaction in prior to the peak of weight loss is 7.227 kJ/mol, and the reaction is half order-rate-reaction. The reaction of the peak after E=87.040 kJ/mol, for the second-order-rate reaction. Before and after the peak, weight loss rate equation showed those results:the equation ahead of the peak is:y=9.003,18-0.099,68x, correlation coefficient R2 is 0.998,1; and after the peak:y=5.576+2.105/(1+exp((x-18.076)/1.349)), and R2 is 0.997,8. The treated sludge is mainly in the third stage combustion, and the weight loss rate equation is in good agreement with the weightlessness rate data of the third stage combustion.
Key words:  printing and dyeing sludge  moisture content  burn  thermogravimetric analysis  kinetics