Article Per Year (5 Year)
p-Index From 2021 - 2026
0
P-Index
This Author published in this journals
All Journal Lowland Technology International
A. Putthividhya
Unknown Affiliation
Civil Engineering, Building, Construction & Architecture Engineering Transportation

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search

 1 
COUPLING INFLUENCES OF AQUIFER SPATIAL VARIABILITY AND WASTE COMPOSITIONS ON DISTRIBUTION AND RECOVERY OF DNPAL IN STATISTICALLY HOMOGENEOUS NONUNIFORM POROUS MEDIA A. Putthividhya; S. Rodphai
Lowland Technology International Vol 15 No 2, Dec (2013)
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

PCE and TCE saturation distributions are generated with stochastic models to incorporate spatially varying aquifer properties. the influence of aquifer property correlation on fluid migration and entrapment is explored in cross-sectional 2D numerical two-phase saturated flow models extracted from 3D geostatistical realizatios generated from well-published aquifer data in a nonuniform sandy aquifer. An effort to model a mixture of DNAPL is exercised by employing five compounds DNAPL; a 6:1:1:1:1 by volume ratio of PCE ,toluene, 2-chlorotoluene, 1-bromohexane, and 1-bromoheptane. Comparisons of PCE, TCE, and DNAPL mixture suggest that the choices involving chemical waste compositions greatly influenced the saturation and distribution of DNPAL (i.e., pathways and organic spreading). The organic wastes released into the system can escape to the other 2D cross sections as the waste mixtures are more mobile compared to pure phase. Coupled application of stochastic model of aquifer spatial variablity as well as chemical waste compositions can significantly influence predicted DNAPL infiltration depth, entrapment, and recovery. The resultant distribution profiles of DNAPL mass within the source zone also have implications for DNAPL recovery and subsequent downstream mass fluxes in remediation operations.
Hydrological assessment using stable isotope fingerprinting technique in the Upper Chao Phraya river basin A. Putthividhya; J. Laonamsai
Lowland Technology International Vol 19 No 1, June (2017)
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study is focusing to assess the spatial and temporal distribution of rainfall using water stable isotope technique as well as the surface water-groundwater interactions for the aquifer systems in the Upper Chao Phraya river basin systems. Local precipitation, surface water, and groundwater along the main river courses and their tributaries are directly samples. Massive precipitation isotopic composition database from existing IAEA monitoring network (GNIB) along with local Bangkok precipitation isotopic signature are compared with precipitation from Chiang Mai province to better identify the rainfall isotopic compositions. In addition to the isotopic differentiation of precipitation in the area, its impacts on isotopic characteristics of surface water and groundwater are additionally explored. LMWLs (Local Meteoric Water Line) for local rainfall in Bangkok and Chiang Mai are generated with some seasonal variation due to rain out effect. Surface water is influenced by evaporation at some degree, revealing that rainfall may not be the primary source of surface water. Yom river’s isotope values are far more D and 18O-enriched compared to Ping’s and Nan’s, suggesting the mixing of groundwater with river water and/or the source of surface water may come from dry-period precipitation. Stable oxygen and hydrogen isotopes in groundwater fall on an evaporation line, and are thus indicative of the effects of high evaporation rates through the top surficial material. The isotopic similarity with the more depleted GD and G18O of groundwater samples suggests the potential mixing of groundwater with river water by different mixing processes (54% from river water and 46% from rainfall). The results show correlations in the isotope signature of shallow (< 50 m deep) and deeper aquifer (> 50 m deep) which may be associated with hydraulic connection and/or similar hydrogeological conditions. d-excess stable isotope analyses are beneficial to identify the relative contributions of the wet and dry seasonal sources to the groundwater recharge. The results indicate that groundwater sources are composed of a 71.4% wet seasonal sources and a28.6% dry seasonal sources.
COMPETITIVE SORPTION OF MULTIPLE COMPONENT HEAVY METALS FROM GOLD MINING LEACHATE ONTO LATERITE SOIL A. Putthividhya
Lowland Technology International Vol 10 No 1, June (2008)
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

It is important to understand the mechanisms of releasing of metal elements from mining industries in order to predict or estimate migration of these contaminants in the environment and initiate necessary policy for pollution control and prevention in groundwater aquifer systems. In this study, we focus particularly on assessing the competitive sorption characteristics of Pb, Zn, Ni, and Mn in batch equilibrium experiments using single and multiple metal solutions in natural laterite soil from the Northern Thailand. A series of batch tests was conducted to evaluate the effects of pH on sorption/desorption characteristics of metals and to estimate the sorption/desorption isotherms. Soil chemical processes were characterized using Linear, Langmuir, and Freundlich equations, and the results indicated that sorption isotherms were very well described by the Langmuir model. Pb had the greatest sorption capacity as estimated by the maximum sorption parameter (Qmax) of the Langmuir equation. Sorption characteristics were discovered to be dynamic processes, depending on interaction among multiple component heavy metals, soil properties, and concentrations of metals in the solution. Additionally, the impacts of variable water saturation on heavy metal migration were also explored by employing parameters obtained from previous experiments as input parameters in HYDRUS-2D model to simulate the migration of heavy metals through variable saturated porous media. The computer simulations revealed that the migration of the mixed contaminated plume was governed mainly by the mechanisms in unsaturated zone, rather than the hydraulic head gradient in the saturated zone. In addition, decreasing water contents resulted in higher retention time, promoted the late arrival of water fronts, and therefore could extend the contaminants’ lifetime in the system. Drier soil retarded transport of metals particularly in shallow unsaturated zone, leading to the possible pathway for the contaminants may get back in the hydrologic cycle via plant root uptake.
Trichloroethylene-alcohol-water solubility characteristics with implications for partitioning tracer tests at DNAPL contaminated sites A. Putthividhya; K. Manajit
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Dense nonaqueous phase liquids (DNAPLs) widely occurred at numerous subsurface sites can act as long-term sources of both vapor-phase and groundwater contamination. Successful remediation and effective risk assessment of DNAPLcontaminated sites is limited by current source zone characterization techniques and DNAPL unique behavior. A relatively new method of DNAPL-contaminated site characterization involved the use of partitioning tracers to provide estimates of the known amount of DNAPL. A new practical continuous flow system was developed in this work to explore the DNAPL’s partitioning tracer-water solubility characteristics under pure phase and selected cosolvents conditions which can be crucial for estimate retardation factors of various tracers with implications for partitioning tracer tests at DNAPL-contaminated sites. Trichloroethylene (TCE) was selected as a representative of DNAPL due to its unique properties and solvent effects. Bromide was employed as a non-partitioning tracer, while three alcohols (i.e., iso-propanol, methanol, and ethanol) effluents were determined as a function of time under pure solvent and 30% cosolvent additions. The three alcohols appeared to have been used successfully as a partitioning tracers for detection of potential DNAPL saturation. Moment analysis of breakthrough curves allowed TCE and alcohol mass recovery and retardation factor calculation, and therefore could further estimate apparent DNAPL saturation. Assuming that partitioning to TCE-DNAPL is the only mechanism for retention of alcohols in the system, flow rate and various alcohol fraction additions seemed to have no major influence on retardation factor estimation of partitioning tracers in the system.
Co-Authors J. Laonamsai K. Manajit S. Rodphai