Bio-Crude Production through Recycling of Pretreated Aqueous Phase via Activated Carbon

Energies

卷:14

Lasse Aistrup Rosendahl¹  Ayaz Ali Shah¹  Saqib Sohail Toor¹  Thomas Helmer Pedersen¹  Asbjørn Haaning Nielsen² 

[1] Department of Energy Technology, Aalborg University, Pontoppidanstræde 111, 9220 Aalborg, Denmark;

[2] Department of the Built Environment, Aalborg University, 9220 Aalborg, Denmark;

关键词: aqueous phase recycling;    sewage sludge;    activated carbon;    HTL;    bio-crude;   

DOI  :  10.3390/en14123488

来源: DOAJ

【 摘 要 】

The management and optimization of the aqueous phase are the major challenges that hinder the promotion of hydrothermal liquefaction (HTL) technology on a commercial scale. Recently, many studies reported about the accumulation of the N-content in the bio-crude with continuous recycling of the aqueous phase from high protein-containing biomass. In the present study, sewage sludge was processed at 350 °C in an autoclave. The produced aqueous phase was treated with activated carbon, and its subsequent recycling effect on the properties of the bio-crude and aqueous phase was investigated. By contacting the aqueous phase with activated carbon, 38–43% of the total nitrogen was removed from the aqueous phase. After applying the treated aqueous phase recycling, the energy recovery of the bio-crude increased from 50 to 61% after three rounds of recycling. From overall carbon/nitrogen recoveries, 50 to 56% of the carbon was transferred to the bio-crude phase and more than 50% of the nitrogen remained in the aqueous phase. The aqueous phase contained mostly of N&O-heterocyclic compounds, small chain organic acids, and amides. ICP-AES analysis showed that more than 80% of the inorganic elements were concentrated into the solid phase.

【 授权许可】

Unknown