Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China.
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; College of Environment and Ecology, Chongqing University, Chongqing 400044, China.
Ecotoxicol Environ Saf. 2022 Nov;246:114189. doi: 10.1016/j.ecoenv.2022.114189. Epub 2022 Oct 18.
Chongqing Fuling shale gas field, the largest shale gas exploration site in China, produces a large amount of oil-based drill cuttings (OBDC) every year, which is a hazardous waste. Traditional treatment methods such as solidification/stabilization did not recycle the valuable components such as petroleum hydrocarbons. Pyrolysis is proven to be an efficient method that can recover those components. This study firstly investigated the pyrolysis kinetics by two different methods on the basis of detailed material characterization, and then taking the workers and the surrounding ecological environment as the analysis object, the human health risk assessment (HHRA) and ecological risk assessment were evaluated respectively before and after pyrolysis. The results showed that the pyrolysis of OBDC was divided into three stages, and the cracking of light hydrocarbons stage was the key control step for pyrolysis process. The activation energy E increased gradually during the pyrolysis progress. The HHRA results showed that pyrolysis could greatly reduce the non-carcinogenic risk, carcinogenic risk and ecological risk by 59.6 %, 62.8 % and 75 % respectively. However, the carcinogenic risk after pyrolysis was still higher than the critical value 10.
重庆涪陵页岩气田是中国最大的页岩气勘探区，每年产生大量油基钻屑（OBDC），属于危险废物。传统的处理方法，如固化/稳定化，并没有回收石油烃等有价值的成分。热解被证明是一种有效的方法，可以回收这些成分。本研究首先在详细的材料特性分析的基础上，通过两种不同的方法对热解动力学进行了研究，然后以工人和周围生态环境为分析对象，分别在热解前后进行了人体健康风险评估（HHRA）和生态风险评估。结果表明，OBDC 的热解可以分为三个阶段，轻烃的裂解阶段是热解过程的关键控制步骤。热解过程中活化能 E 逐渐增大。HHRA 结果表明，热解可以使非致癌风险、致癌风险和生态风险分别降低 59.6%、62.8%和 75%。然而，热解后的致癌风险仍然高于 10 的临界值。
