Application of sludge-based biochar generated by pyrolysis: A mini review

ABSTRACT

The production of sludge is increasing with the rapid development of wastewater treatment. However, to sludge disposal, the restriction of landfill and the hazard of incineration fly ash show that it is imperative to develop a suitable technology to solve the sludge problem. As an emerging sludge treatment technology, pyrolysis has the advantages of reduction, stabilization, harmlessness, and recycling to sludge. In addition, high-value utilization can be made to the pyrolysis products, especially for sludge-based biochar. However, the performance of sludge-based biochar can be affected by many factors, thus it is essential to investigate its preparation conditions, existing problems, and potential applications. In view of this, this mini review firstly discusses the preparation and characterization methods of sludge-based biochar, and points out the preparation method of a novel sludge-based biochar that can remove large amounts of pollutants. Then the applications of sludge-based biochar such as adsorbents, soil conditioners, and catalyst carriers, are also introduced, respectively. Meanwhile, the existing problems during the applications of sludge-based biochar are pointed out. Finally, from the perspective of preparation and application of sludge-based biochar, the research emphases in future are proposed.

KEYWORDS:

• Sludge
• biochar
• pyrolysis
• adsorbent
• soil conditioner
• catalyst carrier

Disclosure statement

The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Additional information

Notes on contributors

Yi Deng

Yi Deng, Since 2015, he works at Solid Waste and Chemicals Management Center, Ministry of Ecology and Environment. His research direction is policy management of solid waste.

Qing Huang

Qing Huang, He works at WEEE research centre of Shanghai Polytechnic University since 2015. He focuses on the development of new materials based on solid waste.

Weihua Gu

Weihua Gu, He works at WEEE research centre of Shanghai Polytechnic University since 2015. His research direction is the control of heavy metals in sludge and its assessment.

Shuyuan Li

Shuyuan Li, She works at Solid Waste and Chemicals Management Center, Ministry of Ecology and Environment. Her focuses on the policy management of solid waste.