School of Environmental Science and Engineering, Tianjin University/Tianjin Key Lab of Biomass/Wastes Utilization, Tianjin 300072, P. R. China.
State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, P. R. China.
Environ Sci Technol. 2023 May 2;57(17):7063-7073. doi: 10.1021/acs.est.2c09099. Epub 2023 Apr 5.
Pyrolysis of oily sludge (OS) is a feasible technology to match the principle of reduction and recycling; however, it is difficult to confirm the feasible environmental destination and meet the corresponding requirements. Therefore, an integrated strategy of biochar-assisted catalytic pyrolysis (BCP) of OS and residue utilization for soil reclamation is investigated in this study. During the catalytic pyrolysis process, biochar as a catalyst intensifies the removal of recalcitrant petroleum hydrocarbons at the expense of liquid product yield. Concurrently, biochar as an adsorbent can inhibit the release of micromolecular gaseous pollutants (e.g. HCN, HS, and HCl) and stabilize heavy metals. Due to the assistance of biochar, pyrolysis reactions of OS are more likely to occur and require a lower temperature to achieve the same situation. During the soil reclamation process, the obtained residue as a soil amendment can not only provide a carbon source and mineral nutrients but can also improve the abundance and diversity of microbial communities. Thus, it facilitates the plant germination and the secondary removal of petroleum hydrocarbons. The integrated strategy of BCP of OS and residue utilization for soil reclamation is a promising management strategy, which is expected to realize the coordinated and benign disposal of more than one waste.
油泥（OS）热解是一种符合减量化和再循环原则的可行技术；然而，难以确定可行的环境归宿并满足相应的要求。因此，本研究考察了油泥的生物炭辅助催化热解（BCP）与残渣利用进行土壤修复的综合策略。在催化热解过程中，生物炭作为催化剂会加强难去除的石油烃的去除，而牺牲液体产物的产率。同时，生物炭作为吸附剂可以抑制小分子气态污染物（如 HCN、HS 和 HCl）的释放，并稳定重金属。由于生物炭的辅助作用，OS 的热解反应更有可能发生，并且需要更低的温度才能达到相同的效果。在土壤修复过程中，获得的残渣作为土壤改良剂不仅可以提供碳源和矿物营养，还可以提高微生物群落的丰度和多样性。因此，它有利于植物的萌发和石油烃的二次去除。OS 的 BCP 与残渣利用进行土壤修复的综合策略是一种很有前途的管理策略，有望实现多种废物的协调和良性处理。
