Chaiyaraksa, Chompoonut

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Chaiyaraksa, Chompoonut
Alternative Name
Chaiyaraksa, C.
Main Affiliation
Email
chompoonut.ch@kmitl.ac.th

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    Item type:Publication,
    Treatment of Lignin Wastewater Using Peroxydisulfate Combined with Manganese Oxide-Loaded Biochar
    (2022-09-01)
    Suwannarat, Glinsukol
    ;
    Sontabam, Kemason
    ;
    Sawangying, Soraya
    ;
    Chaiyaraksa, Chompoonut
    The pulp and paper industry wastewater discharge into public water, it will cause water pollution problems. In this research, lignin contaminated synthetic wastewater with a COD value of 2,401 mg/L, and color intensity of 5,432 ADMI was treated using 150 mM sodium peroxydisulfate in combination with MnO<inf>x</inf>-loaded biochar (MnO<inf>x</inf>-B). The MnO<inf>x</inf>-B was produced by pyrolyzing corn core at 400 °C for 4 hours without oxygen, then dipped in 40 mM manganese sulfate for 2 hours, and heated at 600°C for 30 min without oxygen. From the characterization of MnO<inf>x</inf>-B, the surface area, pore volume, pore size, and pH value at the zero-point charges of MnO<inf>x</inf>-B were 153 m<sup>2</sup>/g, 0.054 cm<sup>3</sup>/g, 1.11 nm, and 7.23, respectively. From the FTIR spectrogram, the peak assigned to Mn-O was observed. By applying 150 mM sodium peroxydisulfate and varying three parameters: MnO<inf>x</inf>-B dosage, initial wastewater pH, and reaction time, to treat lignin wastewater, the optimum experimental condition was obtained using 2 mg/L of MnO<inf>x</inf>-B, under pH of 8 for 45 min. The COD and color removal efficiencies were 73% and 90%, respectively. However, the quality of the treated wastewater did not yet pass the pulp and paper mills effluent standards of the Department of Industrial Works.
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    Peroxydisulfate Co-Treatment with MnOx-Loaded Biochar for COD Removal from Automobile Service Station Wastewater
    (2023-01-01)
    Suwannarat, Glinsukol
    ;
    Pattanagulanan, Kunlasatree
    ;
    Rueangsukhon, Chonlada
    ;
    Nasingthong, Panatda
    ;
    Chaiyaraksa, Chompoonut
    This research was aimed at recycling agricultural waste and treating synthetic automobile service station wastewater. Wastewater was synthesized to two levels of COD concentration: 702 mg/L (WW-A) and 7,054 mg/L (WW-B). In the treatment process, 100 mM sodium peroxydisulfate with MnO<inf>x</inf>-loaded biochar (MnO<inf>x</inf>-Biochar) was applied. The MnO<inf>x</inf>-Biochar was produced by dipping corn cob biochar in 40 mM manganese sulfate followed by pyrolyzed at 600°C. The surface area, pore volume, pore size, and pH value at the zero-point charge of MnO<inf>x</inf>-Biochar were 130 m<sup>2</sup>/g, 0.044 cm<sup>3</sup>/g, 1.02 nm, and 7.05, respectively. From the FTIR spectrogram, a peak assignable to Mn-O was observed. The results showed that the initial pH of the wastewater did not affect the treatment efficiency. The optimum MnO<inf>x</inf>-Biochar dosage was 2 g/L. Equilibrium was reached within 120 min of reaction. During the first 15 min, the treatment rate constants (k) of the WW-A and WW-B treatment were 0.0647 min<sup>-1</sup> and 0.0349 min<sup>-1</sup>, respectively. After 15 min, the k values of the WW-A and WW-B treatments were reduced to 0.0242 min<sup>-1</sup> and 0.0094 min<sup>-1</sup>, respectively. The overall treatment efficiencies of the low COD wastewater (WW-A) and high COD wastewater (WW-B) were 97% and 78%, respectively. The treatment mechanisms involved both adsorption and oxidation. The adsorption efficiencies of the WW-A and WW-B treatments were 36% and 18%, respectively.