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Articles 481 - 510 of 777
Full-Text Articles in Environmental Studies
Factors Affecting Energy Consumption For Traveling Of Households In Bangkok Metropolitan Area, Pattana Sirichotpundit, Chamlong Poboon, Duchduen Bhanthumnavin, Wisakha Phoochinda
Factors Affecting Energy Consumption For Traveling Of Households In Bangkok Metropolitan Area, Pattana Sirichotpundit, Chamlong Poboon, Duchduen Bhanthumnavin, Wisakha Phoochinda
Applied Environmental Research
This study aimed to examine factors affecting energy consumption for traveling of households in Bangkok metropolitan area. Data were collected by surveying 1,150 households in 15 districts of Bangkok Metropolitan Administration. The hypotheses were tested by multi regression analysis. Results of the analysis revealed that there were two factors significantly having positive effects on the quantity of energy use for traveling which were physical and structure factors and social and cultural factors. Suggestions for reducing energy use for traveling including promoting working close to living place, improving public transportation service, restricting private vehicle use in the inner zone, and keeping …
Utilization Of Silica Waste To Replace Silica Fume For Mixed Mortar, Petchporn Chawakitchareon, Natthapol Sresthaolarn
Utilization Of Silica Waste To Replace Silica Fume For Mixed Mortar, Petchporn Chawakitchareon, Natthapol Sresthaolarn
Applied Environmental Research
This research investigated the utilization of silica waste to replace the imported condensed silica fume for the production of ready mixed mortar. The silica waste was classified using sieve analysis procedures in order to achieve a high degree of fineness with a spherical shape and average particle size of 3.2 microns. Classified silica waste was used to replace 10 % volume content weight of Type I Portland cement to produce ready mixed mortar. In addition, the samples of condensed silica fume obtained from a representative supplier were also used to produce ready mixed mortar by replacing 10 % cement by …
Carbon Footprint Of An Academic Organization: A Case Study Of The Department Of Environmental Of Environmental Engineering, Chulalongkorn University, Boonjira Janangkakan, Orathai Chavalparit, Premrudee Kanchanapiya
Carbon Footprint Of An Academic Organization: A Case Study Of The Department Of Environmental Of Environmental Engineering, Chulalongkorn University, Boonjira Janangkakan, Orathai Chavalparit, Premrudee Kanchanapiya
Applied Environmental Research
This paper presented the carbon footprint evaluation of an academic institution, direct and indirect greenhouse gas (GHG) emissions were calculated. The major sources of GHG emissions were classified into four main categories, which were energy use, materials use, transportation, and waste (wastewater treatment and solid waste disposal). The aim of this research was to evaluate the GHG emissions of the Department of Environmental Engineering, Chulalongkorn University and to develop alternative options for reduction of the GHG emissions using the Life Cycle Assessment Methodology as a key factor. The result showed that the total carbon footprint of the department based on …
Environmental Performance Of Marble Tile Life Cycle, Nachawit Tikul
Environmental Performance Of Marble Tile Life Cycle, Nachawit Tikul
Applied Environmental Research
Accurate data and information about life cycle environmental impacts of building materials are critical for environmental-friendly building design. This paper reports the findings of environmental impacts assessment of marble tiles produced in Thailand. The life cycle assessment (LCA) approach was employed and the ecoindicator 95 methodology was used in the assessment. Six impact categories were assessed; global warming, acidification, ozone depletion, eutrophication, winter smog, and summer smog. The results show that manufacturing phase contributes the highest impacts compared with other phases of the marble tile life cycle, and the block cutting process is the greatest contributor. Transportation of finished products …
Removal Of Lead By Using Na-A Zeolite Synthesized From Spent Silica-Alumina, Pimonpan Uttapan, Petchporn Chawakitchareon, Dawan Wiwattanadate
Removal Of Lead By Using Na-A Zeolite Synthesized From Spent Silica-Alumina, Pimonpan Uttapan, Petchporn Chawakitchareon, Dawan Wiwattanadate
Applied Environmental Research
This research was carried out in order to investigate the adsorption efficiency of lead removal using sodalite and Na-A zeolite synthesized from spent silica - alumina. The starting material composition used in this experiment was: Al2O3: 1.926 SiO2: 3.165 Na2O: 128 H2O. The optimum condition used to synthesize zeolite was at 90 oC for 4 hr. The experiment was carried out by using sodalite and Na-A zeolite as an adsorbent for removing lead from aqueous solution. The adsorption was carried out in batch experiment. The results indicated that the optimum condition of sodalite and Na-A zeolite for lead adsorption was …
Phytoplankton Community In Cage Culture Farm Areas In The Andaman Coast Of Thailand, Suwat Tanyaros, David Crookall
Phytoplankton Community In Cage Culture Farm Areas In The Andaman Coast Of Thailand, Suwat Tanyaros, David Crookall
Applied Environmental Research
Fish excretory products from cage culture farms combine with nutrients released from the breakdown of excess feed to raise nutrient levels well above normal, creating an ideal environment for phytoplankton blooms. This study was carried out in the Andaman Coast of Thailand to elucidate (a) the impact of cage farms on phytoplankton production, and (b) how water quality affects the phytoplankton community in the area. Phytoplankton and water quality were monitored in cage culture farms from April 2007 to May 2008 in four provinces, (Phang-nga, Krabi, Trang and Satun) along the coast of the Andaman Sea, in southern Thailand. Phytoplankton …
Factors Affecting Farmer's Readiness For Entitling The Standard Swine Farm, Siranee Sriwichian, Kampanat Vijitsrikamol, Am-On Angsuratana
Factors Affecting Farmer's Readiness For Entitling The Standard Swine Farm, Siranee Sriwichian, Kampanat Vijitsrikamol, Am-On Angsuratana
Applied Environmental Research
The objectives of the study were to obtain: 1) farm management of the farmers under the swine farm standard and 2) factors affecting farmer's readiness for entitling the standard swine farm. The samples were drawn from 78 swine farmers in Sam Khwai Phueak Sub-district, Mueang District, Nakhon Pathom Province. The analytical tools of the study comprised descriptive statistics and a multinomial logit model for analyzing the factors affecting farmer's readiness for entitling the standard swine farm. The finding indicated that according to the swine farm standard, the majority of the farmers have performed as follows: 1) farm composition aspect: the …
Modeling Of Sediment Transport In Mae Tao Creek, Tak Province, Thailand, Wunvisa Tharathammathigorn, Pichet Chaiwiwatworakul
Modeling Of Sediment Transport In Mae Tao Creek, Tak Province, Thailand, Wunvisa Tharathammathigorn, Pichet Chaiwiwatworakul
Applied Environmental Research
This research focused on the bed sediment transport during wet season in Mae Tao Creek, Mae Sot District, Tak Province. Sediment was the main source of cadmium transport in Mae Tao Creek. MIKE 11 was used to model the channel flow and bed sediment transport. The model was run in hydrodynamic (HD) and sediment transport module (ST). Time series of water depth from May to October were used to calibrate the hydrodynamics of the creek. The reliability of hydrodynamic results was evaluated based on the correlation coefficient (CC) and Root Mean Square Error (RMSE). The CC and RMSE obtained during …
Factors Affecting Swine Farmer's Decision On Selecting Waste Treatment Systems, Supawan Phupan, Kampanat Vijitsrikamol, Am-On Angsuratana
Factors Affecting Swine Farmer's Decision On Selecting Waste Treatment Systems, Supawan Phupan, Kampanat Vijitsrikamol, Am-On Angsuratana
Applied Environmental Research
The objective of the study were to obtain 1) socioeconomic background of the swine farmers and their current waste treatment system used on farm; 2) the suitable and technically possible waste treatment system for the study site; and 3) factors affecting farmers' decision on selecting waste treatment system. The sample were drawn from 78 swine farmers in Sam Khwai Phueak Sub-district, Mueang District, Nakhon Pathom Province. The analytical tools of the study comprised descriptive statistics and a multinomial logit model for analyzing the factors affecting farmers' decision on selecting waste treatment system. The suitable and technically possible waste treatment systems, …
Feasibility Study For Make-Up Water Quality For Cooling Tower By Electro-Coacgulation Process, Sasipim Manasilp, Cattaleeya Pattamaprom
Feasibility Study For Make-Up Water Quality For Cooling Tower By Electro-Coacgulation Process, Sasipim Manasilp, Cattaleeya Pattamaprom
Applied Environmental Research
Cooling tower was a type of heat transfer equipment which was used to enhance heat rejection to the environment by increasing the surface contact between water and air. Water used in the cooling tower system had to be pretreated to prevent scaling and corrosion. As most factories in the northern part of Bangkok utilized both tap water and groundwater, which was known to contain large amount of minerals and suspended solids, water pretreatment was crucial before entering cooling towers or the heat-exchanging systems. Typical water pretreatment system consisted of sand filtration, carbon adsorption and ion-exchange resin adsorption to remove particles …
Efficiency Of Triple Superphosphate Fertilizer To Stabilize Cadmium In Different Soil Texture Characteristics, Chatchavaporn Yingsombat, Usarat Thawornchaisit
Efficiency Of Triple Superphosphate Fertilizer To Stabilize Cadmium In Different Soil Texture Characteristics, Chatchavaporn Yingsombat, Usarat Thawornchaisit
Applied Environmental Research
This research investigated the effectiveness of Triple Superphosphate (TSP) as a stabilizing agent for cadmium (Cd) in three representative soils having different texture characteristics (loamy-sand, clay loam, and clay soils). Results showed that addition of TSP proved to be an effective method for reduction of Cd leachability in all Cd contaminated soils. The partitioning of Cd from the potentially available phase to the more stable phase was observed in all TSP treatments based on the sequential extraction data. Moreover, performance of TSP to immobilize Cd depended on soil types and compositions. The effectiveness of TSP to reduce Cd leachability was …
Effects Of Ferrocene On The Solubilization Of Alkanes In A Microemulsion System, Saravanee Singtong, Chantra Tongcumpou, David A. Sabatini
Effects Of Ferrocene On The Solubilization Of Alkanes In A Microemulsion System, Saravanee Singtong, Chantra Tongcumpou, David A. Sabatini
Applied Environmental Research
Ferrocene is a metallic additive that has been used to boost the octane number of gasoline. Even though ferrocene is not an environmental contaminant of high concern, it can be found in soil contaminated with gasoline. Due to its organometallic nature, ferrocene may affect the phase behavior of other alkanes which has been contaminated to the environment and limit their removal using surfactant-enhanced aquifer remediation (SEAR). Therefore, the aim of this work was to investigate the effects of ferrocene on the solubilization capacity of alkanes in micellar surfactant solutions. The solubilization capacity and column study of alkanes with and without …
Effects Of Smoking Locations And Room Ventilation On Occupant Exposure To Environmental Tobacco Smoke, Chaloemchai Mukthawat, Maneerat Ongwandee, Nida Chaimoon
Effects Of Smoking Locations And Room Ventilation On Occupant Exposure To Environmental Tobacco Smoke, Chaloemchai Mukthawat, Maneerat Ongwandee, Nida Chaimoon
Applied Environmental Research
Non smoker exposure to second hand smoke is still of concern even though smoking free environments have been implemented in public places in Thailand. Thus, smokers have changed their behavior to smoke in their dwellings instead which could cause pollutant transfers from a smoking area to an adjacent non smoking area by air flows between zones. The objective of this study was to investigate relative magnitudes of environmental tobacco smoke (ETS) in a non smoking area that is adjacent to a smoking residential area. The study was also to demonstrate the effect of room ventilation rates on exposure levels of …
Health Impact Assessment Of Pesticide Use In Northern Thai Farmers, Ratana Sapbamrer, Arrak Damrongsat, Prajak Kongtan
Health Impact Assessment Of Pesticide Use In Northern Thai Farmers, Ratana Sapbamrer, Arrak Damrongsat, Prajak Kongtan
Applied Environmental Research
The present study aims to assess health impacts on pesticide use in 136 farmers from Baan Mai Ras Bam Rung Village, San Kong Subdistrict, Dok Kham Tai District, Phayao. Questionnaire and laboratory examination were used as tools. Pesticide use in questionnaire consisted of objectives, type and reasons of pesticide use, prevention practices from exposure, etc. Health impacts questionnaire included physical, mental, social, and spiritual health. The results showed that most farmers planted rice crop and the major pesticide use was insecticides (79.4 %), followed by herbicides, fungicides, and acaricides, respectively (78.7, 40.4 and 33.1 %). The reasons for the use …
Methane Potential Of Household Waste; Batch Assays Determination, Nutchanat Chamchoi, Hector Garcia, Irini Angelidaki
Methane Potential Of Household Waste; Batch Assays Determination, Nutchanat Chamchoi, Hector Garcia, Irini Angelidaki
Applied Environmental Research
An assay for determination of the methane potential of household waste (HHW) was developed. The assay was performed in batch vials with thermophilic inoculum from a biogas plant co-digesting swine manure with industrial waste. Methane potential of 500 mL g-1VS was achieved within 10 d. Blending of the HHW household waste was suitable method for homogenization of the material. Although blending altered the physical image of the sample, it did not alter the original composition of the material. Thermal pre-treatments of the waste (70 °C for 1 h) and combined thermal alkaline pre-treatment (70 °C for 1 h and addition …
Risk Ratio Of Benzene, Toluene, Ethylbenzene, And Xylene (Btex) Exposures And Their Relations To Biological Parameters Of Gasoline Workers In Bangkok, Thailand, Tanasorn Tunsaringkasrn, Panthira Ketkaew, Kalaya Zapaung, Anusorn Rugsiyothin, Surasak Taneepanichkul
Risk Ratio Of Benzene, Toluene, Ethylbenzene, And Xylene (Btex) Exposures And Their Relations To Biological Parameters Of Gasoline Workers In Bangkok, Thailand, Tanasorn Tunsaringkasrn, Panthira Ketkaew, Kalaya Zapaung, Anusorn Rugsiyothin, Surasak Taneepanichkul
Applied Environmental Research
Gasoline station is a common source of volatile organic compounds (VOCs) emissions around its perimeter. In order to conduct a monitoring of the VOC's emission, measurements of biological markers of blood benzene, toluene, ethylbenzene and xylene (BTEX) in gasolinestation workers are recommended. The purposes of this study were to evaluate exposure risk ratio (110 gasoline station workers from 11 gasoline stations in Bangkok Metropolitan area compared to 10 office workers in the same station as control group) and to determine the relations between blood BTEX and biological parameters of the gasoline workers. Results showed that blood BTEX levels of gasoline …
Effect Of Organochlorines On Human Endocrine System, Ratana Sapbamrer
Effect Of Organochlorines On Human Endocrine System, Ratana Sapbamrer
Applied Environmental Research
Organochlorines are classified as persistent organic pollutants and endocrine disrupters. They were widely used for insect control and malaria vector control programs. Although most organochlorines were officially banned in many countries, high levels have been found in ecosystem and food chain. Because organochlorines act as endocrine disrupters and lipid soluble chemicals, it is difficult to excrete these environmental pollutants from the body, and consequently caused adverse effects on endocrine system in wildlife and humans. Epidemiological studies have suggested that exposure to organochlorines in adults linked with an increase incidence of reproductive tract abnormalities, decreased sperm quantities and qualities, and reproductive …
Relationship Of The Quantity Of Blood Lead Levels And The Knowledge, Work Practice, And Attitude Of Workers In A Recycling Battery Factory In Nakhonsawan Province, Santi Keadthongthawee, Piyalamporn Havanond
Relationship Of The Quantity Of Blood Lead Levels And The Knowledge, Work Practice, And Attitude Of Workers In A Recycling Battery Factory In Nakhonsawan Province, Santi Keadthongthawee, Piyalamporn Havanond
Applied Environmental Research
This research was a cross-sectional study. The purpose was to study relationship between knowledge, work practice and attitude of workers toward quantity of lead in their blood. The study took place during January-December 2008 in a recycling battery factory in Nakhonsawan Province by means of purposive sampling. Relevant data were gathered by structured questionnaire which was tested for reliability by means of Cronbach's alpha coefficient. Analysis of the relationship was performed via Pearson's product-moment correlation coefficient. The statistical significance was considered when p < 0.05. The results of the study of total 72 workers were as followings: average score of knowledge was 12.8 out of 15 with the SD of 1.6, max score of 15 and min score of 9; average behavior score of workers was 12.9 out of 15 with SD of 1.3, max score of 15 and min score of 9; average score on attitude was 22.7 out of 30 with SD of 0.94, max score 25 and min score of 21. Hence, majority of them were in good knowledge (86.1 %) and had good work practice (93.1 %). As well, all workers (100 %) had good attitude. Significant (p < 0.05) relationship between levels of lead in blood and behavior of workers was found. The workers with high quantity of lead in their blood stream took more precaution on their work practice. This might be the fact that they knew that lead in blood could naturally be released by mechanism of body. Furthermore, the condition could be improved if they do not obtain further lead. On the other aspect, the relationship between age and level of lead in blood is also significant (p < 0.001). The workers with older age had more quantity of lead in blood than young workers. However, there was no relationship among quantity of lead in blood toward attitude or knowledge of the workers. From the study, it is suggested that annual blood test and physical examination of all workers should be implemented. Furthermore, it should emphasize on the campaign of good work practice. Especially, smoking during working hour must be strictly prohibited, since the protection mask has to be taken off and open the chance of taking the lead in.
Potential Of Recycle Waste Bank Project For Community Waste Reduction: A Case Study Of Sub-Sin Pattana Community, Bang Khun Thien, Bangkok, Sayam Aroonsrimorakot, Piyaruk Pradabphetrat
Potential Of Recycle Waste Bank Project For Community Waste Reduction: A Case Study Of Sub-Sin Pattana Community, Bang Khun Thien, Bangkok, Sayam Aroonsrimorakot, Piyaruk Pradabphetrat
Applied Environmental Research
This research studied the potential of a recyclable waste bank (RWB) Sub-Sin Pattana Community, Bang Khun Thien District, Bangkok in reduction of volumes of community waste. Problems and obstacles in implementing the project were also studied. Data were collected by recyclable waste (RW) analysis, questionnaire and in-depth interview with the members and committee of RWB project. Data sources were 10 waste samples taken from 10 households, 79 respondents of structured questionnaire, 12 respondents of in-depth interview (including 10 members and 2 committee staff of the project). The study found that people registered with the RWB project sorted their waste before …
An Efficiency Test On Wave Energy Reduction Of Piled Breakwaters Using Physical Model, Ar-Sawin Intasupa, Winai Ouypornprasert, Payom Ratanamanee, Tanawat Jarupongsakul, Pramot Sojisuporn
An Efficiency Test On Wave Energy Reduction Of Piled Breakwaters Using Physical Model, Ar-Sawin Intasupa, Winai Ouypornprasert, Payom Ratanamanee, Tanawat Jarupongsakul, Pramot Sojisuporn
Applied Environmental Research
The physical model at Hydraulic Engineering Laboratory Unit, Prince Songkhla University was used to test the efficiency of a triangular-concrete piled breakwater. Seven parameters; namely wave height, wave period, water depth, spacing between row, spacing between pile in the same row, angle of incident wave and orientation of pile's angle in the row were selected and each parameter was tested at 3 predefined values, namely low, medium and high values. The piled breakwater was composed of either one, two, three or four rows of piles. The best arrangement which could reduce the incident wave energy for up to 53 % …
Potential Of End Of Life Vehicles Directive Implementation In Thai Automotive Industry, Sayam Aroonsrimorakot, Sirirat Akaraj
Potential Of End Of Life Vehicles Directive Implementation In Thai Automotive Industry, Sayam Aroonsrimorakot, Sirirat Akaraj
Applied Environmental Research
The objectives of this research were to study the potential of end of life vehicles (ELV) directive implementation in Thai Automotive Industry in Thailand. This research was divided into 2 parts; a survey research using questionnaire with 113 Thai automotive entrepreneurs, qualitative research using indepth interview with relevant persons related to automotive industry. The results indicated that Thai Automotive entrepreneurs had impacts from the ELV directive at a medium level, the average score was 2.94. The readiness for undertaking ELV directive was at medium level, the average score was 3.22. Problems and obstacles in implementing ELV directive were knowledge and …
Distribution Of Heavy Metals In Mangrove Sediment At The Tha Chin Estuary, Samut Sakhon Province, Thailand, Supaporn Buajan, Nathsuda Pumijumnong
Distribution Of Heavy Metals In Mangrove Sediment At The Tha Chin Estuary, Samut Sakhon Province, Thailand, Supaporn Buajan, Nathsuda Pumijumnong
Applied Environmental Research
The concentrations of selected heavy metals (Cd, Cu, Pb and Zn) at a depth of 0-30 cm sediments from 11 stations in a mangrove forest at Bang Ya Praeg, Tha Chin Estuary, Samut Sakhon Province, Thailand were examined. The ranges of heavy metals, in mg kg-1 dry weight (dw), were as follows: Cd (0.035 to 0.070), Cu (7.90 to 21.91), Pb (11.91 to 25.74) and Zn (55.99 to 75.05). The dry season (April 2009) had higher levels of heavy metals than the wet season (August 2009). Heavy metals in the study area had the following order of prevalence: Zn > Pb …
Trends In Temperature And Rainfall Extreme Changes In Bangkok Metropolitan Area, Sangchan Limjirakan, Atsamon Limsakul, Thavivongse Sriburi
Trends In Temperature And Rainfall Extreme Changes In Bangkok Metropolitan Area, Sangchan Limjirakan, Atsamon Limsakul, Thavivongse Sriburi
Applied Environmental Research
Trends in temperature and rainfall extremes in the Bangkok Metropolitan area were analyzed on the basis of 3 high-quality series of daily data. A set of core climate extreme indices recommended by the WMOCCL/ CLIVAR Expert Team on Climate Change Detection, Monitoring and Indices (ETCCDMI) that measures many aspects of a changing climate including changes in intensity, frequency and duration of temperature and rainfall events was computed. Analysis of these indices provided clear evidence that different aspects of temperature and rainfall extremes in the Bangkok Metropolis exhibited significant changes during 1965- 2006. The region has been clearly warming over the …
Observed Changes In Daily Rainfall Extreme Along Thailand's Coastal Zones, Atsamon Limsakul, Sangchan Limjirakan, Thavivongse Sriburi
Observed Changes In Daily Rainfall Extreme Along Thailand's Coastal Zones, Atsamon Limsakul, Sangchan Limjirakan, Thavivongse Sriburi
Applied Environmental Research
Trends in daily rainfall extreme along Thailand's coastal zones were examined, based on 28 high-quality series of daily rainfall data observed at the stations along the Andaman Sea Coast (ASC), the Gulf of Thailand's western coast (GoTw) and the Gulf of Thailand's eastern coast (GoTe). A set of core climate extreme indices recommended by the WMO-CCL/CLIVAR Expert Team on Climate Change Detection, Monitoring and Indices (ETCCDMI) that measures different aspects of rainfall extreme events such as wetness and dryness conditions, frequency and intensity rainfall events was calculated. Analysis of these indices revealed notable changes in rainfall extreme events along Thailand's …
Air Pollutant Emissions From The Burning Of Incense, Mosquito Coils, And Candles In A Small Experimental Chamber, Maneerat Ongwandee, Wilas Pipithakul
Air Pollutant Emissions From The Burning Of Incense, Mosquito Coils, And Candles In A Small Experimental Chamber, Maneerat Ongwandee, Wilas Pipithakul
Applied Environmental Research
Combustion of incense, candles, and mosquito coils produces a variety of air pollutants, which may cause adverse health effects. This study was to characterize emissions of particulate matter (PM2.5) and carbon monoxide (CO) from the burning process of three selected types of emitters: incense, candles, and mosquito coils. The experiments were conducted in an aluminum foil-lined wall chamber with a dimension of 1x1x1 m3. Emission rates and emission factors of the test emitters were obtained from fitting time-dependent concentrations of the measured pollutants to a single-compartment mass balance model. The emission rates and emission factors of incense combustion were: PM2.5 …
Inter-Phase Mass Transport: Modelling Of Air-Water Movement Of Organic Chemicals, Darryl Hawker, Benjalak Karnchanasest
Inter-Phase Mass Transport: Modelling Of Air-Water Movement Of Organic Chemicals, Darryl Hawker, Benjalak Karnchanasest
Applied Environmental Research
Air-water inter-phase mass transport of organic contaminants is often an important factor in their environmental fate and behaviour. The equilibrium situation is given by the Henry's Law Constant of the compound, but is rarely attained under environmental conditions. Approach to equilibrium is commonly described by the two-film theory involving molecular (Fickian) diffusion through thin stagnant films adjacent to the air-water interface. This theory is formulated in terms of mass transfer coefficients and fugacity transport parameters. Penetration and Surface Renewal Theories of mass transfer are also discussed. The importance of the Henry's Law Constant (H) is shown. Compounds such as phenol …
Durian Peel As Biosorbent For Removal Of Cadmium Ions From Aqueous Solution, Wanna Saikaew, Pairat Kaewsarn
Durian Peel As Biosorbent For Removal Of Cadmium Ions From Aqueous Solution, Wanna Saikaew, Pairat Kaewsarn
Applied Environmental Research
The ability of durian peel to remove Cd(II) ions from aqueous solution by biosorption was investigated. The sorption capacities at different solution pH, agitation speed, temperatures, initial cadmium ions concentrations and contact time were evaluated on a batch scale basis. At pH 5 and agitation speed 150 rpm, the cadmium ions removal reached at a maximum value. Increases in cadmium capacity with increasing temperature indicated endothermic nature of the biosorption process. The equilibrium was better described by the Langmuir isotherm model, with a maximum biosorption capacity of 18.55 mg g-1. The biosorption was relatively quick about 15 min to reach …
Suppression Of Pyrite Oxidation With Iron-Phosphate Coating: Technique For Prevention Of Acid Mine Drainage, Chantra Tongcumpou, Nipon Kongmak, Chakkaphan Sutthirat
Suppression Of Pyrite Oxidation With Iron-Phosphate Coating: Technique For Prevention Of Acid Mine Drainage, Chantra Tongcumpou, Nipon Kongmak, Chakkaphan Sutthirat
Applied Environmental Research
This study was aimed to evaluate the feasibility of an iron-phosphate coating on pyrite surfaces for inhibiting an oxidation that is expected to prevent acid mine drainage (AMD). Prior to the experiments, pyrite samples (av. 425-850 µm in size) were mixed with sand (av. 1-2 mm in size) with a ratio of 1:4. Coating process was conducted in batch experiments that were treating with various concentrations of coating solutions, i.e., hydrogen peroxide (H2O2), sodium acetate (NaAc) and potassium dihydrogen phosphate (KH2PO4) at different contact times. Subsequently, leaching test was performed in columns (10 mm in diameter) using 0.145 M of …
Monitoring Of Water Quality Using Phytoplankton, Protozoa, And Benthos As Bioindicator In Chadeebucha Canal, Nakhon Pathom Province, Thanawan Panich-Pat, Warin Yenwaree, Rattiya Ongmali
Monitoring Of Water Quality Using Phytoplankton, Protozoa, And Benthos As Bioindicator In Chadeebucha Canal, Nakhon Pathom Province, Thanawan Panich-Pat, Warin Yenwaree, Rattiya Ongmali
Applied Environmental Research
Water quality was monitored using phytoplankton, protozoa and benthos as bioindicators in Chadeebhucha Canal, Nakhon Pathom Province. Data was collected during 12 sampling periods at 9 stations, 4 times per month in April, August and December, 2007. Phytoplankton and protozoa were collected at the surface level and a 0.4 m subsurface level. Benthos was collected from bottom sediment in the canal. Phytoplankton collected represented 3 divisions, i.e. Cyanophyta, Chlorophyta and Chromophyta as 4 dominant genera, Oscillatoria, Euglena, Scenedesmus and Phacus, indicating low water quality. Protozoa were found as 2 phyla; i.e. Ciliophora (3 genera) and Sacromastigophora (1 genus), which are …
A Preliminary Study On Total Volatile Organic Compound (Tvoc) Concentrations In Public Buses In Bangkok, Manunart Feungpean, Sopa Chinwetkitvanich
A Preliminary Study On Total Volatile Organic Compound (Tvoc) Concentrations In Public Buses In Bangkok, Manunart Feungpean, Sopa Chinwetkitvanich
Applied Environmental Research
Recently, some new buses made in China have been purchased to give the transportation services in Bangkok due to their lower price. Unfortunately, volatile air pollutants emitted from material in new motor vehicles was little concern. The objective of this study was to conduct a preliminary survey of total volatile organic chemicals (TVOCs) in the cabins of some new buses used in public transportation in Bangkok. TVOCs was monitored in the air-condition buses running within Bangkok area under actual driving condition. Three buses were randomly sampled from three routes, i.e. the route number 8, 539 and 542. All of sampling …