期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 383, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.121163
关键词
Hydrothermal liquefaction wastewater; Anaerobic digestion; Resistant compounds
资金
- National Key Research and Development Program of China [2017YFC0212900, 2017YFC0212200]
- Science and Technology Commission of Shanghai Municipality [17230740900]
- program of China Scholarship Council (CSC) [201708310124]
- National Key Technology Support Program [2015BAD15B06]
- National Natural Science Foundation of China [21577025, 31970117]
- State Key Laboratory of Heavy Oil Processing
Anaerobic digestion (AD) has shown potential to convert hydrothermal liquefaction wastewater (HTLWW) into biogas in previous studies. However, the identification of refractory components and further insights into the molecular transformations of organics in HTLWW are essential for developing more efficient AD processes. In this study, two HTLWWs were obtained from the temperature-derived hydrothermal liquefaction of sewage sludge at 170 degrees C and 320 degrees C. Their molecular compositions, as well as their modifications in the subsequent AD process, were characterized using a suite of advanced molecular tools. The dissolved organic matter (DOM) in the high temperature-derived HTLWW was lower in molecular weight, less saturated, less oxidized, and enhanced in nitrogenous substances. During the AD process, most of the volatile compounds and low molecular weight (LMW) neutrals were removed, while biopolymers were the most refractory. Carboxylic-rich alicyclic molecules (CRAM), particularly those containing 3 to 5 N for low temperature-derived DOM and 1 to 3 N for high temperature-derived DOM, were resistant to anaerobic biodegradation. Meanwhile, compounds with fewer nitrogens and more carboxyl groups were preferentially produced. This molecular characterization of HTLWW-derived DOM and examination of its transformation during AD will contribute to the development of efficient methods for HTLWW treatment in the future.
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