Enhancement of Supercritical Water Oxidation for Municipal Sludge Degradation

2018 2nd International Conference on Environmental, Industrial and Energy Engineering

生态环境科学;能源学

Li, Jianna^1 ; Wang, Shuzhong^1 ; Jiang, Zhuohang^1 ; Xu, Tiantian^1 ; Wang, Dong^1

Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'An Jiaotong University, 28 Xianning West Road, Xi'an

710049, China^1

关键词: Degradation efficiency;    Municipal sludge;    Reaction conditions;    Removal efficiencies;    Removal of cods;    Residence time;    Supercritical water oxidation;    Total residence time;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/219/1/012022/pdf
DOI  :  10.1088/1755-1315/219/1/012022

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Different measures to enhance the removal efficiency of municipal sludge by supercritical water oxidation were further studied in a batch reactor, including catalytic supercritical water oxidation, co-oxidation with methanol and multi-injection of oxidant experiments at 580 °C, 25 MPa within a total residence time of 10 min and a total oxidant coefficient of 1.1. The experimental results showed that splitting the same amount of oxidant and feeding into reactor at two different residence time had a significant enhancement on the removal of COD compared with NH3-N, and the optimal second injection time of oxidant was 7.5 min in this investigation. Meanwhile, CuO catalyst could increase the degradation efficiency of both COD and NH3-N, and it increased with the amount of CuO added, which was better than methanol. Moreover, combining CuO with injecting oxidant multi-stage experiment produced the maximum organics degradation efficiency of 99.9% and 83.47% for COD and NH3-N, respectively, it demonstrates lower COD degradation of 99.58% and NH3-N degradation of 35.69% utilizing methanol at fixed reaction condition.