城市污泥焚烧过程中Pb、Cd的迁移特性  

Migration Characteristics of Pb,Cd during Municipal Sewage Sludge Incineration Process

作　　者：张一帆 张守玉[1] 茆青 江锋浩 ZHANG Yi-fan;ZHANG Shou-yu;MAO Qing;JIANG Feng-hao(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,China,Post Code ： 20009)

机构地区：[1]上海理工大学能源与动力工程学院

出　　处：《热能动力工程》2018年第10期140-146,共7页Journal of Engineering for Thermal Energy and Power

基　　金：国家科技支撑计划资助(2012BAA04B01);上海理工大学科技发展项目(16KJFZ094)~~

摘　　要：以城市污泥为研究对象，利用电热管式炉对其进行焚烧实验，研究了不同焚烧温度和不同停留时间下Pb、cd的迁移和转化特性。研究结果表明：随着焚烧温度的升高，焚烧底渣中Ph、Cd残留率下降趋势明显，底渣中cd的残渣态转化为可还原态及可氧化态，而Pb由可氧化态向残渣态转化，且焚烧底渣中Pb和cd的残渣态所占的比率均在90％以上，有利于降低焚烧底渣中Pb和Cd的浸出浓度。在焚烧温度900℃下，随着焚烧时间的延长，Cd和Pb残留率在20min时达到最低，底渣中Cd的残渣态向可氧化态转化，Pb的残渣态比率几乎不变，且焚烧底渣申Pb和Cd的残渣态所占的比率均在90％以上。Partitioning and transformation of Pb and Cd contained in sewage sludge during incineration process were investigated under different incineration temperature and residence time using a laboratory tubular furnace. The result indicates that the fixation rate of Pb and Cd significantly decreases with the in- crease of incineration temperature, and the residual fraction of Cd transforms into the reducible and oxi- dizable fraction, while the oxidizable fraction of Pb transforms into the residual fraction. Moreover, the ra- tio of residual fraction of Pb and Cd in the incineration bottom slag is above 90%, which is beneficial to reduce the leaching concentration of Pb and Cd in the incineration bottom slag. Additionally, at the incin- eration temperature of 900 ℃, with the extension of incineration time, the residual ratio of Cd and Pb reaches the minimum at 20 min, and the residual fraction of Cd in the bottom slag converts to the oxidiza- ble fraction, while the ratio of residual fraction of Pb is almost unchanged. And the ratio of the residual fraction of Pb and Cd in the incinerated bottom slag is above 90%.

关 键 词：城市污泥 焚烧 CD PB 残留率 形态分析 

分 类 号：X705[环境科学与工程—环境工程]