WZU-UNBC Joint Research Institute of Ecology and Environment, Wenzhou University (WZU), Wenzhou, Zhejiang Province, China; Environmental Engineering Program, University of Northern British Columbia (UNBC), Prince George, British Columbia, V2N 4Z9, Canada.
WZU-UNBC Joint Research Institute of Ecology and Environment, Wenzhou University (WZU), Wenzhou, Zhejiang Province, China; Environmental Engineering Program, University of Northern British Columbia (UNBC), Prince George, British Columbia, V2N 4Z9, Canada.
J Hazard Mater. 2019 Jul 5;373:1-10. doi: 10.1016/j.jhazmat.2019.03.061. Epub 2019 Mar 16.
The treatment of metal-contaminated oily waste was investigated by using an approach of co-pyrolysis with hog fuel in a fixed bed reactor. Both oil recovery and heavy metal immobilization were evaluated. Three experimental factors, including pyrolysis temperature, reaction time, and hog fuel addition in the feedstock, were examined to find their effects on the treatment performance. Metal immobilization in the solid char obtained from co-pyrolysis was examined from its speciation characteristics. A higher pyrolysis temperature led to a decreased oil recovery but more non-bioavailable metal species in the char residue. This is also evident from the calculated risk index (RI) for eco-toxicity assessment, with RI of 34.6 and 117.1 at 600 °C and 400 °C, respectively. The addition of hog fuel into oily waste for co-pyrolysis also led to increased metal immobilization but a decreased overall oil recovery. A low temperature co-pyrolysis (400 °C) by adding 20% of hog fuel was found as the most effective oily waste disposal strategy with satisfactory oil recovery and an acceptable risk index of 54.1.
采用固定床反应器中与猪粪共热解的方法研究了含金属油污的处理方法，评估了油回收和重金属固定化两种效果。考察了三个实验因素，包括热解温度、反应时间和进料中猪粪的添加量，以寻找它们对处理性能的影响。通过共热解获得的固体炭中金属的形态特征来研究金属的固定化。较高的热解温度会导致油回收减少，但炭残渣中更多的非生物利用金属种类。这也可以从生态毒性评估的计算风险指数（RI）中看出，分别在 600°C 和 400°C 下，RI 值为 34.6 和 117.1。将猪粪添加到含油废物中进行共热解也会导致金属固定化增加，但总油回收率降低。通过添加 20%的猪粪进行低温共热解（400°C），发现这是最有效的含油废物处理策略，具有令人满意的油回收率和可接受的风险指数 54.1。
