厨余垃圾干湿压榨分离-水热炭化技术工程应用研究

以厨余垃圾干湿压榨分离-水热炭化技术的工程应用为研究对象,评估工程的运行效能,分析单位厨余垃圾处理的能耗情况,核算厨余垃圾处理成本。结果表明:该厨余垃圾处理工程日均处理量为115.32 t/d,厨余垃圾平均减量化率达到60.31%。厨余垃圾经干湿压榨分离-水热炭化处理得到的产物为干垃圾和水热炭,含水量分别为68.41%和35.92%,低位热值分别为5029.61 J/g和14424.80 J/g,与未处理的厨余垃圾相比,其燃烧性能大幅提升。厨余垃圾处理的单位能耗为46.26 kW·h/t,其中压榨处理环节的能耗只占总能耗的10.54%,水热炭化处理环节能耗占比最高,达到了72.14%。每吨厨余垃圾的处理成本为386.56元,水热炭化处理的成本占总成本的41.69%。该工程有效地实现了厨余垃圾的减量化与资源化,处理产物在制备垃圾衍生燃料、吸附材料、生物碳基肥料以及土壤改良剂方面具有很好的应用前景,为城市厨余垃圾处理工程建设提供提供了可靠的设计参考与技术支撑。

ENGINEERING APPLICATION OF A DRY-WET PRESS SEPARATION-HYDROTHERMAL CARBONIZATION TECHNOLOGY FOR FOOD WASTE

In this study, a case project of dry-wet press separation of food waste-hydrothermal carbonization technology was taken as the research object. The operational efficiency of the food waste treatment project was evaluated, and the energy consumption and cost for per unit of food waste treatment were analyzed. The study results were as follows: the project treated an average of 115.32 t of food waste per day, with a waste mass reduction rate of 60.31%. The products obtained by dry-wet press separation-hydrothermal carbonization of food waste were dry waste and hydrothermal carbon, the moisture contents of them were 68.41% and 35.92%, and the low-level calorific values were 5029.61 J/g and 14424.80 J/g, respectively. The combustion performance of the products was substantially higher than raw food waste. The unit energy consumption of food waste treatment was 46.26 kW·h/t, of which hydrothermal carbonization treatment and wet and dry separation and pressing treatment accounted for 72.14% and 10.54%, respectively. The cost of food waste disposal was RMB 386.56/t. The project effectively achieves the reduction and reuse of food waste. The treatment products have promising applications in making waste-derived fuels, adsorbent materials, biochar-based fertilizers and soil amendments. This research provides reliable design reference and technical support for the development of urban food waste treatment projects.