Enhanced energy and resource recovery via synergistic catalytic pyrolysis of byproducts from thermal processing of wastewater solids

RENEWABLE ENERGY

卷:177

Article

Liu, Zhongzhe¹  Hughes, Matthew²  Tong, Yiran³  Zhou, Jizhi⁴  Kreutter, William²  Valtierra, Danny¹  Singer, Simcha²  Zitomer, Daniel³  McNamara, Patrick³ 

[1] Calif State Univ Bakersfield, Dept Phys & Engn, 9001 Stockdale Highway, Bakersfield, CA 93311 USA

[2] Marquette Univ, Dept Mech Engn, Milwaukee, WI 53233 USA

[3] Marquette Univ, Dept Civil Construct & Environm Engn, Milwaukee, WI 53233 USA

[4] Shanghai Univ, Sch Econ, Shanghai 200444, Peoples R China

关键词: Biosolids;    Biochar;    Bio-oil;    Sludge drying chaff;    Sludge incinerator ash;    Tar reduction;   

DOI  :  10.1016/j.renene.2021.05.125

来源: Elsevier

【 摘 要 】

Wastewater sludge drying and incineration are conventional solids handling processes that are sometimes employed in water resource reclamation facilities. However, these two processes generate byproducts, sludge drying chaff and sludge incinerator ash, which are landfilled without taking advantage of their value. To gain value from these byproducts, a new synergistic catalytic pyrolysis process using chaff and ash was investigated in this study to improve energy production (i.e. generating a high yield pyrolysis gas) and generate useful products. Ash was used as a catalyst to decrease bio-oil that is corrosive and challenging for combustion in standard equipment, while increasing pyrolysis gas yield and energy for easier energy recovery. Ash increased the pyrolysis gas yield by 50% and product energy by nearly two-fold at the highest ash loading. The bio-oil volume was greatly reduced and contained fewer constituents based on GC-MS and GC-FID analyses. The product energy shifted from bio-oil to pyrolysis gas, which is relatively clean and easier for onsite energy recovery. Ca and Fe content in ash likely plays the catalytic role. (c) 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

【 授权许可】

Free