Investigation of the emission and leaching behavior of characteristic heavy metals in sintered bricks prepared from oil-based drill cutting residues

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2024-10-01 DOI:10.1016/j.wasman.2024.09.026

Changhao Cui , Dahai Yan , Chao Chen , Meijia Liu , Li Li , Jian Wang

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引用次数: 0

Abstract

Oil-based drill cutting residues (OBDCR) are hazardous waste generated by the thermal desorption of oil-based drill cuttings. Recently, the utilization of OBDCR as building materials has attracted extensive attention, but the environmental risks during preparation and long-term usage remained unclear. In this study, OBDCR with a 40 % (wt./wt.) mixing ratio was used to prepare sintered bricks, and the emission and leaching behaviors of Ba, Mn, Zn, Ni, Cr, and Pb were investigated. The results indicated that the addition of OBDCR in bricks showed insignificant increase in the emission of Ba, Mn, Zn, Ni, and Cr, whereas the emission of Pb slight decreased from 10.5 to 8.6 μg/m³. The volatilization rates of these heavy metals were considerably low, with Ni showed the highest volatilization rate of only 1.45 % in OBDCR bricks. Moreover, the leaching behavior of Ba, Mn, Zn, Ni, Cr, and Pb in bricks were studied. The results indicated that surface wash-off was the main controlling leaching mechanism of Ba and Cr, whereas the leaching of Mn, Zn, Ni, and Pb was controlled by diffusion. The Elovich and second-order kinetic equation were identified as the leaching models for Mn, Zn, Pb, and Ni. The life-time leaching predictions of OBDCR bricks indicated that the leaching of Ni and Mn after 10 and 20 years of leaching were 0.1529, 0.257, 0.1530, and 0.274 mg/L, respectively, exceeding the relevant standards. Therefore, the leaching risks of Ni and Mn should be emphasized when using OBDCR bricks with a 40 % OBDCR mixing ratio.

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油基钻削残渣制备的烧结砖中特征重金属的排放和浸出行为研究

油基钻屑残渣（OBDCR）是油基钻屑热解吸产生的危险废物。近来，将 OBDCR 用作建筑材料引起了广泛关注，但其在制备和长期使用过程中的环境风险仍不明确。本研究使用混合比为 40%（重量比/重量比）的 OBDCR 制备烧结砖，并研究了 Ba、Mn、Zn、Ni、Cr 和 Pb 的排放和浸出行为。结果表明，在烧结砖中添加 OBDCR 后，钡、锰、锌、镍和铬的排放量增加不明显，而铅的排放量则从 10.5 μg/m3 微降至 8.6 μg/m3。这些重金属的挥发率相当低，其中镍的挥发率最高，在 OBDCR 砖中仅为 1.45%。此外，还研究了砖、锰、锌、镍、铬和铅的浸出行为。结果表明，表面冲刷是控制钡和铬沥滤的主要机制，而锰、锌、镍和铅的沥滤则受扩散控制。埃洛维奇和二阶动力学方程被确定为锰、锌、铅和镍的浸出模型。OBDCR 砖的终生浸出预测结果表明，经过 10 年和 20 年浸出后，镍和锰的浸出量分别为 0.1529、0.257、0.1530 和 0.274 mg/L，超过了相关标准。因此，在使用 OBDCR 混合比为 40% 的 OBDCR 砖时，应重视镍和锰的浸出风险。

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)