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Lignin removal from synthetic wastewater via Fenton-like reaction over Cu supported on MCM-41 derived from bagasse: Optimization and reaction intermediates
(2023-02-01)
Sriprom, Pongsert
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Neramittagapong, Sutasinee
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Lin, Chitsan
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Neramittagapong, Arthit
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Assawasaengrat, Pornsawan
Lignin degradation was performed using a Fenton-like oxidation reaction with Cu supported on MCM-41, derived from bagasse (Cu-BG-MCM-41), as the catalyst. The optimal degradation conditions required to remove a predetermined amount of lignin (95%) from an effluent were determined. Based on the literature review and preliminary tests, the critical parameters determining the operating conditions include temperature, catalyst loading, pH, H<inf>2</inf>O<inf>2</inf> concentration, and reaction time. The experimental design and working conditions were based on Box–Behnken design. The reaction products were analyzed via UV–vis and gas chromatography-mass spectrometry. Response surface methodology (RSM) was used to predict the optimum operating conditions for the Fenton-like reaction for 95% lignin degradation, which were a temperature of 80 °C, initial pH of 9, H<inf>2</inf>O<inf>2</inf> concentration of 1 mL/L, catalyst loading of 1.0 g/L, and reaction time of 30 min. These conditions were validated three times and the achieved percentage of lignin degradation was 95 ± 2%. This is close to the value of 95% used in the RSM to determine the optimum operating conditions, thus verifying the model. The catalyst was stable and functioned well under the optimum design conditions. Moreover, the reaction could be used to obtain high-value intermediate products if stopped after 5 min. Finally, lignin was degraded into vanillin, a higher-value product. As expected, the proposed Fenton-like approach expanded the pH working range from less than 4 to 5–9.
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Degradation of Penicillin G contaminant in synthesized wastewater by Fenton-like reaction
(2022-06-08)
Nisapai, Wiparat
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Paikamnam, Athipong
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Sriprom, Pongsert
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Neramittagapong, Sutasinee
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Theerakulpisut, Somnuk
The aim of this research was to investigate the degradation of Penicillin G (PEN G) in synthesized wastewater via a Fenton-like reaction. Calcium dioxide (CaO2) was used as an oxidant in the Fenton-like reaction. Factors of the PEN G degradation study such as pH, FeSO4, CaO2, and reaction time were determined using the Box-Behnken design (BBD). The experimental study was conducted in a 500 mL batch reactor, with 150 ppm initial concentration of PEN G. The results showed that PEN G degradation was optimal (38.67%) at pH 3, ferrous dosage of 0.08 g/L, CaO2 concentration of 1 g/L, and reaction time of 120 min. The degradation took place in the first 20 min. The reaction time was increased up to 120 min to achieve a pH of 8 in the test solution to meet the industrial effluent standard by the Ministry of Industry, Thailand. The kinetic study indicated second order and the pseudo first order reaction for the degradation in 0-20 min and 20-120 min, respectively. The research results indicated that pH, iron dosage, and CaO2 content-except reaction time-influenced PEN G degradation as predicted by the BBD. The degradation was substantially quick as well. Fenton-like reaction for a high concentration of PEN G should be used as pre-treatment.
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Innovative mycoremediation technique for treating unsterilized PCDD/F-contaminated field soil and the exploration of chlorinated metabolites
(2021-11-15)
Kaewlaoyoong, Acharee
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Chen, Jenq Renn
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Cheng, Chih Yu
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Lin, Chitsan
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Cheruiyot, Nicholas Kiprotich
Mycoremediation of unsterilized PCDD/F-contaminated field soil was successfully demonstrated by solid-state fermentation coupled with Pleurotus pulmonarius utilizing a patented incubation approach. The experiments were carried out in four setups with two as controls. The contaminated soil was homogenously mixed with solid inocula, 1:0.5 dry w/w, resulting in an initial concentration of 4432 ± 623 ng WHO-TEQ kg−1. After a 30-day incubation under controlled conditions, the overall removal (approx. 60%) was non-specific. The removal was attributed to degradation by extracellular ligninolytic enzymes and uptake into the fruiting tissue (~110 ng WHO-TEQ kg−1 of mushroom). Furthermore, less recalcitrant chlorinated metabolites were found, implying ether bond cleavage and dechlorination happened during the mycoremediation. These metabolites resulted from the complex interaction between P. pulmonarius and the indigenous microbes from the unsterilized soil. This study provides a new step toward scaling up this mycoremediation technique to treat unsterilized PCDD/F-contaminated field soil.
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White rot fungus Pleurotus pulmonarius enhanced bioremediation of highly PCDD/F-contaminated field soil via solid state fermentation
(2020-10-10)
Kaewlaoyoong, Acharee
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Cheng, Chih Yu
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Lin, Chitsan
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Chen, Jenq Renn
;
Huang, Wen Yen
This study was performed to evaluate the use of white rot fungus, Pleurotus pulmonarius, to treat polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) in contaminated soil using solid state fermentation (SSF). The soil was collected from a long-closed pentachlorophenol plant in southern Taiwan. The non-sterilized soil with a total PCDD/F concentration of 14,000 ± 2400 ng I-TEQ kg−1 was mixed directly with the solid fungal inocula at dry w/w ratio of 1:1.4 (ratio-adjusted test) and incubated at 26 ± 2 °C in a controlled environment. The highest PCDD/F decomposition was observed during the mycelium colonization. Pearson correlation coefficient (r) studied during this period (35 days) indicated that laccase had no significant correlation (r = −0.53), while manganese peroxidase had a strong positive correlation (r = 0.88) with PCDD/F decomposition efficiency. After 72 days, the more toxic congeners, tetra- and penta-CDD/Fs were removed to non-detectable levels. Meanwhile, the removal efficiencies of hexa-, hepta-, and octa-CDD/Fs were >80%, >97%, and >90%, respectively. The simultaneous degradation of low and high chlorinated DD/Fs suggested that overall removal was nonspecific. The overall PCDD/F removal was 96%, and the residual concentration (276 ng I-TEQ kg−1) was below the regulatory control limit (1000 ng I-TEQ kg−1). In conclusion, this study shows that P. pulmonarius via SSF can successfully remediate the PCDD/F-contaminated field soil. Furthermore, this SSF technique overcame the well-known intractability of PCDD/F biodegradation in non-sterilized soil, making it promising for actual field application.

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