Bioeconomy Institute, Iowa State University, Ames, IA 50011, USA.
Bioeconomy Institute, Iowa State University, Ames, IA 50011, USA; Key Laboratory for Biomass Clean Energy of Anhui Province, University of Science and Technology of China, Hefei 230026, China.
Bioresour Technol. 2017 May;232:229-234. doi: 10.1016/j.biortech.2017.02.015. Epub 2017 Feb 7.
Concerns over increasing amounts of sewage sludge and unsustainability of current disposal methods have led to development of alternative routes for sludge management. The large amount of organics in sewage sludge makes it potential feedstock for energy or fuel production via thermochemical pathways. In this study, ex-situ catalytic pyrolysis using HZSM-5 catalyst was explored for the production of olefinic and aromatic hydrocarbons and nutrient-rich char from sewage sludge. The optimal pyrolysis and catalysis temperatures were found to be 500°C and 600°C, respectively. Carbon yields of hydrocarbons from sewage sludge were higher than for lignocellulose; yield differences were attributed to the high extractives content in the sludge. Full recovery of most inorganic elements were found in the char, which suggests that catalyst deactivation maybe alleviated through ex-situ catalytic pyrolysis. Most of the nitrogen was retained in the char while 31.80% was released as ammonia, which suggests a potential for nitrogen recycling.
对不断增加的污水污泥量和当前处理方法不可持续性的担忧，促使人们寻求替代的污泥管理途径。污水污泥中大量的有机物使其成为通过热化学途径生产能源或燃料的潜在原料。在这项研究中，使用 HZSM-5 催化剂进行了原位催化热解，以从污水污泥中生产烯烃和芳烃以及富含营养的炭。发现最佳的热解和催化温度分别为 500°C 和 600°C。与木质纤维素相比，来自污水污泥的碳氢化合物的产率更高；产率差异归因于污泥中高含量的提取物。大部分无机元素都在炭中得到了完全回收，这表明通过原位催化热解可以减轻催化剂失活的问题。大部分氮保留在炭中，而 31.80%以氨的形式释放，这表明氮有回收利用的潜力。
