Highly efficient degradation of lactic acid by microwave-induced activated carbon catalytic oxidation process

Summary: High-concentration refractory coffee wastewater containing about 2,000 mg/L of biotoxic lactic acid is treated by microwave technology. At a microwave power of 900 W, a large amount of activated carbon (AC) reduces the number of hot spots. After microwave radiation, the lactic acid concentr...

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Bibliographic Details
Published in:iScience
Main Authors: Fanfan Liang, Yungen Liu, Silin Yang, Yan Wang, Yiyang Peng
Format: Article
Language:English
Published: Elsevier 2025-07-01
Subjects:
Chemistry
Environmental science
Food science
Online Access:http://www.sciencedirect.com/science/article/pii/S2589004225009551
Description
Summary:Summary: High-concentration refractory coffee wastewater containing about 2,000 mg/L of biotoxic lactic acid is treated by microwave technology. At a microwave power of 900 W, a large amount of activated carbon (AC) reduces the number of hot spots. After microwave radiation, the lactic acid concentration drops to 200 mg/L, with a removal rate of 90%. CaO promotes the process. In the microwave-AC-CaO method, “hotspots” on AC generate free radicals. The effects of microwaves degrade lactic acid into CO2 and H2O. The microwave-AC-CaO method can rapidly degrade lactic acid. The degradation rate of lactic acid can be further improved by adding transition-metal oxides to modify AC.
ISSN:2589-0042

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