期刊
JOURNAL OF CLEANER PRODUCTION
卷 320, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2021.128919
关键词
Antimicrobial; Biochar; Biodegradation; Cell immobilization; Detoxification
资金
- National Research Council of Thailand (Thailand) [N42A640329]
- Research Center for Environmental and Hazardous Substance Management (Khon Kaen University, Thailand)
- Center of Excellence on Hazardous Substance Management (Thailand)
The study demonstrates that using microbial cells immobilized on waste biochar can achieve high TCC removal efficiency in wastewater treatment. The use of cell-immobilized biochar shows significant potential for future utilization and can contribute to the development of a circular bio-based economy using renewable agroindustrial wastes.
Triclocarban (TCC), an emerging endocrine disruptor, has been commonly found in municipal treated wastewater. Pseudomonas fluorescens MC46 (MC46), an effective TCC-degrading bacterium, could be applied to remove TCC from wastewater. In addition, application of a cell immobilization technique could possibly enhance its removal performance. This study examined microbial cells immobilized on waste biochar (from wood vinegar production) as a highly effective advanced wastewater treatment unit for TCC removal. TCC removal was investigated from real wastewater samples using the following treatments: biochar only, cell-immobilized biochar, and free cell systems in batch (short-term) and semi-batch (long-term) modes. The TCC adsorption capacities of original and potassium hydroxide-modified biochars (no cells) were 8.43 and 9.17 mg/g, respectively. During the batch experiment, the cell-immobilized modified biochar exhibited the highest TCC removal, 79.80%, in the model TCC solution. Five-cycle semi-batch experiments were utilized to investigate the reusability and performance of the treatment systems. After five cycles, the cell-immobilized modified biochar still achieved stable TCC removal (52%) due to the integration of adsorption and biodegradation. Free MC46 cells and biochars (no MC46 cells) only removed 32% and 2% of TCC, respectively, due to cell washout/death and sorbent exhaustion. This important work clearly demonstrates the significant potential for the future utilization of cellimmobilized biochars in a sustainable wastewater treatment system. Furthermore, the use of renewable agroindustrial wastes aid in the development of a strong circular bio-based economy.
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