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P. Kajitvichyanukul
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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Fate and transport of paraquat dichloride in corn and rubber plantation soils D. Keochan; W. Sinlapathorn; P. Phuinthiang; N. Nawinwattana; M. Jindakaraked; P. Kajitvichyanukul
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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The rubber and corn plantation soils in Nan province were investigated for the fate and transport behavior of the paraquat dichloride including biodegradation, adsorption, photolysis and infiltration. All experiments were conducted in the batch scale in laboratory basis. Results showed the biodegradation and photolysis were the main factors in decreasing the paraquat dichloride concentrations in the corn soil and rubber soil. The adsorption and infiltration described the holding and the leaching of paraquat dichloride of the soils. The biodegradation rates of paraquat dichloride in corn and rubber soils were 0.0548 and 0.0213 kg/day-mg, respectively. In photolysis reaction, the kinetic rate constants for corn and rubber soils were 0.017 and 0.0133 kg/min-mg, respectively. Corn and rubber soils had strong and quick adsorption for paraquat dichloride due to the soil textures of both two soils are clay and the high amount of cation exchange capacity. Corn soil had higher adsorption rate constant than rubber soil The adsorption behavior of paraquat dichloride in rubber soils is best described by Freundlich isotherm and that in the corn soil is best describe by Langmuir-II isotherm. The kinetic rate constants for photo-degradation of paraquat dichloride in corn and rubber soils were 0.0170 and 0.0133 kg/mg-min, respectively. From the mass balance, paraquat dichloride in leachates was detected in the lower amount than in the soil for both corn and rubber soils. Although paraquat dichloride can bound to organic matter or soil particles and adsorb in the soil, small amount of paraquat dichloride can be leached out to the groundwater.
Comparison of fate and transport of atrazine in corn and rubber plantation soils W. Sinlapathorn; D. Keochanh; P. Phuinthiang; N. Nawinwattana; M. Jindakaraked; P. Kajitvichyanukul
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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The rubber and corn plantation soils in Nan province were investigated for the fate and transport behavior of the atrazine. The biodegradation, adsorption, photodegradation, and infiltration of atrazine in both soils were conducted. The kinetic rates of each experiment were calculated and reported. Results illustrated that the microbials in the soils have a high tendency in consuming the atrazine in both corn and rubber soils. The corn soils with the biodegradation rate as 0.2523 Kg/mg-min had higher kinetics rate than rubber soil with 0.1357 Kg/mg-min. Langmuir isotherm best described the adsorption of atrazine in both corn and rubber soils. The sorption capacity of atrazine adsorption on the rubber soil (1/qm = 9.7095) was much higher than the corn soil (1/qm = 0.5195). The amount of herbicide residue bonded on soil after application in the rubber soil was slightly higher than the corn soil, and the photolytic rate in the rubber soil is much higher than that in the corn soil. From the mass balance, atrazine in water was detected in the higher amount than in the soil for both corn and rubber soils. The infiltration rate in corn soil was 13.1 mm/hr while that in rubber soil was 11.8 mm/hr. The mass of atrazine in the leachate is in the range of 32.1-75.3% in both corn and rubber soils during 36 hours of infiltration. This experiment is the scientific evidence supporting that the contamination of atrazine in groundwater has high tendency to occur in the extreme application of the atrazine to the agriculture soil.
Diclofenac removal by submerged MF membrane photocatalytic reactor and coupling with RO membrane T.V. Tung; J. Ananpattarachai; P. Kajitvichyanukul
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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The purpose of coating TiO2 on microfiltration membrane in photocatalytic membrane reactor (PMR) enhances the permeate flux and effluent quality. In this study, Nitrogen doped TiO2 (NTiO2) on ceramic membrane surface submerged in the photocatalytic reactor under visible irradiation was used for diclofenac (DCF) removal. Different photocatalytic processes including without (Vis/N-TiO2 process) and with hydrogen peroxide (H2O2) (Vis/N-TiO2/H2O2 process) were investigated. Kinetic were identified with different DCF initial concentration in bath condition for both processes. The behaviors of DCF removal by the submerged membrane photocatalytic reactor (SMPR) in combination with reverse osmosis (RO) membrane were carried out in the continuous condition in the long term. The result showed that DCF and TOC concentrations increased in the photocatalytic reactor during operation time. It was a cause of returning DCF molecules and its products to the photocatalytic reactor by the RO membrane rejection. Coupling H2O2 with the photocatalytic process enhanced the DCF and TOC removal by SMPR under the visible irradiation.
Photocatalytic membrane reactors for water and wastewater treatment applications: process factors and operating conditions review T.V. Tung; J. Ananpattarachai; P. Kajitvichyanukul
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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This paper aimed to overview of coupling photocatalytic process and membrane, known as photocatalytic membrane reactors (PMRs) and their potential applications in wastewater treatment, especially application for the decomposition of persistent organic matters. Mechanisms of PMRs for organic removal by photocatalytic and membrane processes are described. PMRs with suspended and immobilized TiO2 on/in the membrane are intensively reviewed. Several operating factors such as pH, initial TiO2 concentration, the concentration of pollutants, dissolved oxygen and aeration, hydraulic retention time as well as light intensity have been intensively discussed. Advantages and disadvantages of two types of PMRs are illustrated. This review is benefit to further future works such as up-scale PMRS to the industrial level, and the operating and maintenance needs for the effective PMRs.
Co-Authors D. Keochan D. Keochanh J. Ananpattarachai M. Jindakaraked N. Nawinwattana P. Phuinthiang T.V. Tung W. Sinlapathorn