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165 results on '"Chang, Ken-Lin"'

30. Assessment of PM2.5 Chemical Composition and Air Quality Monitoring: Implications of Air Pollutants Emissions from a Night Market in Kaohsiung City, Taiwan

Author

Amesho, Kassian T.T., primary, Lin, Yuan-Chung, additional, Gong, Zhou-Wei, additional, Chou, Feng-Chih, additional, Cheng, Pei-Cheng, additional, Wang, Tsu-Nai, additional, Chen, Pei-Shih, additional, Chen, Kang-Shin, additional, Chang, Ken-Lin, additional, and Lee, Chien-Hung, additional

Published
2021
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32. Decomposition of aqueous 2,2,3,3-tetra-fluoro-propanol by UV/[O.sub.3] process

Author

Chou, Ming-Shean and Chang, Ken-Lin

Subjects
Decomposition (Chemistry) -- Observations, Oxidation-reduction reaction -- Observations, Water pollution -- United States, Water pollution -- Control, Sewage -- Purification, Sewage -- Methods, Engineering and manufacturing industries, Environmental issues
Abstract

2,2,3,3-Tetra-fluoro-propanol (TFP) has been extensively used in compact disk-recordable and digital versatile disk-recordable manufacture and a large amount of wastewater containing the chemical is being discharged. This investigation evaluates the feasibility and effectiveness of the use of UV, [O.sub.3], and UV/[O.sub.3] to degrade aqueous TFP. TFP oxidation tests were performed with initial TFP concentrations of 772-887 mg/L with various solution pH values (acidic, alkaline, uncontrolled), solution temperatures (26, 37, 48, and 60 [degrees C), and UV wavelengths (254 and 185 nm). Experimental results demonstrated that alkaline conditions favor the TFP degradation and increase the mass of TFP decomposition per unit mass of ozone consumption, in both [UV.sub.254] nm/[O.sub.3] and [UV.sup.185] nm/[O.sub.3] processes. There was no significant difference in the rate of TFP degradation when using either [UV.sub.254] nm or [UV.sub.185] nm. TFP exhibited zero-order degradation kinetics when sufficient ozone was supplied. A higher oxidation temperature was found to be no help for the UV/[O.sub.3] oxidation of TFP in the tested concentration and temperature ranges. The cost of the [UV.sub.254] nm/[O.sub.3] or [UV.sub.185] nm/[O.sub.3] per unit volume of wastewater with an initial TFP concentration of 3,387 mg/L is comparable to that of the Fered-Fenton process as described in the literature. DOI: 10.1061/(ASCE)0733-9372(2007)133:10(979) CE Database subject headings: Decomposition; Wastewater management; Oxidation; Water pollution; Effluents.

Published
2007

38. Gas-phase isopropanol degradation by nonthermal plasma combined with Mn-Cu/-Al2O3.

Author

Chang, Ken-Lin, Lin, Yu-Chieh, Qiu, Ming-Ze, Tu, Chun-Wei, Chang, Chih-Ping, Wu, Jhong-Lin, Lin, Yung-Chang, and Chang, Chien-Kuei

Subjects
NON-thermal plasmas, CARBON dioxide detectors, ISOPROPYL alcohol, CARBON dioxide, ACETONE, METAL catalysts, CARRIER gas, OXYGEN
Abstract

In this study, the dielectric barrier discharge (DBD) induced by nonthermal plasma (NTP) technology was used for isopropanol (IPA) degradation. IPA, intermediate, final product, and ozone concentrations were analyzed using GC-MS, carbon dioxide detector, and ozone detector. The experimental flow rate and concentration were fixed to 1 L/min and 1200 ppm ± 10%, respectively. Different reaction procedures were proposed for self-made metal catalyst combined with a plasma system (plasma alone and γ-Al2O3 combined with plasma, Cu (5 wt%)/γ-Al2O3 combined with plasma, Mn (3 wt%)-Cu (5 wt%)/γ-Al2O3 combined with plasma). In addition, the effect of the carrier gas oxygen content (0%, 20%, and 100%) on IPA conversion and intermediate and carbon dioxide selectivity was also investigated. The results revealed that the Mn (F)-Cu/γ-Al2O3 combined with plasma exhibited more efficient IPA conversion. In the 100% oxygen environment, the IPA conversion rate increased from 79.32 to 99.99%, and carbon dioxide selectivity increased from 3.82 to 50.23%. IPA was completely converted after 60 min of plasma treatment with the acetone selectivity, carbon dioxide selectivity, and tail ozone concentration of 26.71% ± 1.27%, 50.23% ± 0.56%, and 1761 ± 11 ppm, respectively. This study proved that the current single planar DBD configuration is an effective advanced treatment technology for the decomposition of VOCs. [ABSTRACT FROM AUTHOR]

Published
2021
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49. Spent mushroom substrate biochar as a potential amendment in pig manure and rice straw composting processes.

Author

Chang, Ken-Lin, Chen, Xi-Mei, Sun, Jian, Liu, Jing-yong, Sun, Shui-yu, Yang, Zuo-yi, and Wang, Yin

Subjects
MUSHROOMS, BIOCHAR, COMPOSTING
Abstract

Spent mushroom substrate (SMS) is a bulky waste byproduct of commercial mushroom production, which can cause serious environmental problems and, therefore, poses a significant barrier to future expansion of the mushroom industry. In the present study, we explored the use of SMS as a biochar to improve the quality of bio-fertilizer. Specifically, we performed a series of experiments using composting reactors to investigate the effects of SMS biochar on the physio-chemical properties of bio-fertilizer. Biochar was derived from dry SMS pyrolysed at 500°C and mixed with pig manure and rice straw. Results from this study demonstrate that the addition of biochar significantly reduced electrical conductivity and loss of organic matter in compost material. Nutrient analysis revealed that the SMS-derived biochar is rich in fertilizer nutrients such as P, K, Na, and N. All of these findings suggest that SMS biochar could be an excellent medium for compost. [ABSTRACT FROM PUBLISHER]

Published
2017
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