Microwave pyrolysis of oily sludge under different control modes

Yang Liu; Hejie Yu; Zhihui Jiang; Yongmeng Song; Tianhao Zhang; Asif Ali Siyal; Jianjun Dai; Xiaotao Bi; Jie Fu; Wenya Ao; Chunbao Zhou; Long Wang; Xiangtong Li; Xiaoxia Jin; Dayong Teng; Jian Fang

doi:10.1016/j.jhazmat.2021.125887

Microwave pyrolysis of oily sludge under different control modes

J Hazard Mater. 2021 Aug 15:416:125887. doi: 10.1016/j.jhazmat.2021.125887. Epub 2021 Apr 15.

Authors

Yang Liu¹, Hejie Yu¹, Zhihui Jiang¹, Yongmeng Song¹, Tianhao Zhang¹, Asif Ali Siyal¹, Jianjun Dai², Xiaotao Bi³, Jie Fu¹, Wenya Ao¹, Chunbao Zhou¹, Long Wang¹, Xiangtong Li¹, Xiaoxia Jin⁴, Dayong Teng⁴, Jian Fang⁴

Affiliations

¹ Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
² Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China. Electronic address: jjdai@mail.buct.edu.cn.
³ Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Clean Energy Research Centre, The University of British Columbia, Vancouver, BC V6T 1Z3, Canada.
⁴ Tianjin Chemical Research & Design Institute, China National Offshore Oil Corporation, Tianjin 300131, China.

PMID: 34492825
DOI: 10.1016/j.jhazmat.2021.125887

Abstract

The effects of temperature and power on product distribution and characteristics of oily sludge (OS) pyrolysis were investigated in a microwave reactor. The maximum oil yield was 72.55 wt% at 550 °C and 71.47 wt% at 800 W, respectively. X-ray photoelectron spectroscopy (XPS) indicated that C-C and C-O were the main forms of carbon in OS char (OC). The sulfur (S) content in OC increased as the temperature/power rose, implying that S might exist in the form of inorganics or OC had S retention ability. In temperature control mode, the changes of functional groups on OC surface were more sensitive. The maximum hydrocarbon content in oil was 14.56% at 350 °C and 13.40% at 900 W, respectively. The contents of oxygenated compounds and heterocycles in oil from temperature control mode were higher. The CO yield increased with increasing temperature/power, reaching the maximum of 9.60 wt% at 650 °C and 7.75 wt% at 900 W, respectively. Compared with power control mode, it seemed that more heavy metals (HMs) were retained in OC in temperature control mode. The E_r of HMs were at the clean level and RI indicated the HMs in OC had a low environmental risk.

Keywords: Control mode; Microwave pyrolysis; Oily sludge.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Metals, Heavy*
Microwaves
Pyrolysis*
Sewage
Temperature

Substances

Metals, Heavy
Sewage