Abstract

In order to explore the effect of CaO on the ecological risk of chromium (Cr), copper (Cu) and zinc (Zn) in Oily sludge (OS), the incineration experiments of OS with and without calcium oxide (CaO) additive were carried out respectively in a horizontal tube furnace at the temperature ranging from 800 °C to 1000 °C. Furthermore, the ecological risk based on Risk Assessment Code (RAC) of Cr, Cu and Zn in OS, bottom ash from OS incineration (OSA) and bottom ash from OS incineration in the presence of CaO additive (OSA-CaO) were investigated in this work. The results showed that most of the Cr and Cu in OS remained in bottom ash, while Zn volatilized with the flue gas. At the same time, the RAC of Cr, Cu and Zn in OS decreased significantly after incineration. Compared with OSA, CaO obviously promoted the stabilization of Cr and Cu in OSA-CaO, but had little effect on the behavior of Zn. Moreover, CaO also reduced the RAC of Cu and Zn in samples, and reduced its harm to ecosystem. This study supplied essential data and theoretical support for the industrial treatment of OS, and was of great help to the harmless treatment of OS.

摘要

为了探讨CaO对含油污泥（OS）中铬（Cr）、铜（Cu）和锌（Zn）生态风险的影响，进行了含氧化钙（CaO）添加剂和不含氧化钙（CaO）添加剂的OS焚烧实验。分别在 800°C 至 1000°C 的水平管式炉中取出。此外，研究了基于 OS 中 Cr、Cu 和 Zn 的风险评估代码 (RAC)、OS 焚烧产生的底灰 (OSA) 和存在 CaO 添加剂 (OSA-CaO) 的 OS 焚烧产生的底灰的生态风险。这项工作。结果表明，OS 中的大部分 Cr 和 Cu 留在底灰中，而 Zn 随烟气挥发。同时，焚烧后OS中Cr、Cu和Zn的RAC显着降低。与 OSA 相比，CaO 明显促进了 OSA-CaO 中 Cr 和 Cu 的稳定，但对 Zn 的行为影响不大。此外，CaO还降低了样品中Cu和Zn的RAC，减少了其对生态系统的危害。本研究为OS的工业化处理提供了必要的数据和理论支持，对OS的无害化处理有很大帮助。