Maejo International Journal of Energy and Environmental Communication最新文献_第2页

Gas chromatography analysis of the microwave-aided extracted agarwood oil from physically induced Aquilaria malaccensis trees in Northern Thailand 泰北地区物理诱导沉香树微波萃取沉香油的气相色谱分析

Maejo International Journal of Energy and Environmental Communication Pub Date : 2022-12-31 DOI: 10.54279/mijeec.v4i3.248277

Chuyên Thuận Nguyễn, Chanthana Susawaengsup, Thomas Singer, Krittiya Tongkoom, Ralf Oberg, Rapeephun Dangtungee, P. Bhuyar

{"title":"Gas chromatography analysis of the microwave-aided extracted agarwood oil from physically induced Aquilaria malaccensis trees in Northern Thailand","authors":"Chuyên Thuận Nguyễn, Chanthana Susawaengsup, Thomas Singer, Krittiya Tongkoom, Ralf Oberg, Rapeephun Dangtungee, P. Bhuyar","doi":"10.54279/mijeec.v4i3.248277","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.248277","url":null,"abstract":"Agarwood (Aquilaria malaccensis) oil is one of the essential bioactive materials in the scent/ perfume industry for the middle east and gulf countries. The built-in functionality and availability of bioactive components of oil make agarwood more precious. In this study, the physically induced infected agarwood tree chops were extracted by microwave assisted Soxhlet extraction. Moreover, the extracted oil samples were analyzed against control not infected trees using Gas chromatography-mass spectroscopy (GC-MS) by GCMS (Agilent GC 6890zN MS 5973). The microwave assisted Soxhlet extraction revealed a higher amount of oil extraction. In the physically induced samples, 24 signal peaks were recorded employing GC-MS. The most prominent peak area recorded was -5-hydroxy-3-methyl-1-indanone detected at minute 41.89 with a peak area of 17.64%, followed by -methyl 4,4,7-trimethyl 4.7-dihydro indan -6- carboxylate at 23.17 min, occupying an area of 15.54%; followed by 3-carene recorded at 46.61 minutes with an area. According to this research, the microwave-assisted Soxhlet extraction method outperformed and can be utilized in the agarwood industry for enhanced oil production.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88862639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Application of hurdle Poisson model to predict the abundance of toxic cyanobacteria Microcystis in reservoirs 应用障碍泊松模型预测储层中有毒微囊藻的丰度

Maejo International Journal of Energy and Environmental Communication Pub Date : 2022-12-17 DOI: 10.54279/mijeec.v4i3.247529

Truc-Ly Le-Huynh, T. Itayama, Kaito Mitsunaga, Misigo W. S. Angalika, Seiji Suzuki

{"title":"Application of hurdle Poisson model to predict the abundance of toxic cyanobacteria Microcystis in reservoirs","authors":"Truc-Ly Le-Huynh, T. Itayama, Kaito Mitsunaga, Misigo W. S. Angalika, Seiji Suzuki","doi":"10.54279/mijeec.v4i3.247529","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.247529","url":null,"abstract":"The blooming of toxic cyanobacteria Microcystis in eutrophicated reservoirs causes serious difficulties for water supply worldwide. For the appropriate management of such reservoirs, a prediction model of toxic cyanobacteria Microcystis can be a useful tool. Therefore, this study aims to develop a Bayesian hurdle Poisson model for statistical prediction of toxic Microcystis from only two predictors, air temperature and trophic state index (TSI) calculated from chlorophyll-a. The gene copy number of the mcyB gene was used as a surrogate of toxic Microcystis cell density. The data on mcyB gene and chlorophyll-a were collected from 20 reservoirs in Nagasaki Prefecture (Japan). The daily average air temperature was downloaded from the local meteorological stations and a mean for 30 days before sampling date was calculated. The results showed that higher temperature and larger TSI accelerate the growth of toxic Microcystis. Furthermore, this model successfully predicted mcyB gene copy number as a surrogate of toxic Microcystis cell density for different conditions of air temperature and TSI with sufficient accuracy. Therefore, the proposed model has the potential to be a useful prediction tool for toxic cyanobacteria Microcystis in the integrated management of reservoirs.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85533312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Removal of CO2 and H2S from biogas and enhanced compressed bio-methane gas production from swine manure and elephant grass 去除沼气中的CO2和H2S，提高猪粪和象草压缩生物甲烷气体的产量

Maejo International Journal of Energy and Environmental Communication Pub Date : 2022-12-01 DOI: 10.54279/mijeec.v4i3.248270

N. Dussadee, Kamoldara Reansuwan, Rameshprabu Ramaraj, Yuwalee Unpaprom

{"title":"Removal of CO2 and H2S from biogas and enhanced compressed bio-methane gas production from swine manure and elephant grass","authors":"N. Dussadee, Kamoldara Reansuwan, Rameshprabu Ramaraj, Yuwalee Unpaprom","doi":"10.54279/mijeec.v4i3.248270","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.248270","url":null,"abstract":"Anaerobic co-digestion of concentrated swine manure with elephant grass silage was used, and this study carried out in full-scale three continuously stirred tank reactors was operated at mesophilic temperature. The Biogas impurity removal procedure was enhanced by using a molecular sieve and activated carbon. Two molecular sieve tanks are used to absorb water from the biogas. An activated carbon tank (2 meters) was used to eliminate H2S to < 1 ppm before entering the gas tank. In the form of compressed bio-methane gas (CBG), production was 14,400 m3/day (CH4 60-70%), and the amount of CBG was 9,600 m3/day 6.8 tons/day. The raw biogas containing CH4, CO2, and O2 are 68.8%, 29.7% and 0% with H2S 768 ppm. After the enhancement process, CBG having CH4, CO2, O2 are 89.35%, 10.05 0% and 0.02% with < 0.01 ppm H2S. Therefore, after the purification process amount of CO2, H2S gas was considerably reduced and CH4 was improved by up to 90% by volume, and then the CBG was compressed to 250 bar tanks to the fuel for cars. Therefore, these results clearly demonstrate that the activated carbon method is feasible to process for the removal of CO2 and H2S from biogas in a large-scale plant.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74232626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Statistical analysis of the effects of environmental factors and fish species on class-sorted phytoplankton composition in aquaculture ponds in northern Thailand 环境因子和鱼种对泰国北部水产养殖池塘浮游植物分类组成影响的统计分析

Maejo International Journal of Energy and Environmental Communication Pub Date : 2022-11-15 DOI: 10.54279/mijeec.v4i3.247635

Truc-Ly Le-Huynh, N. Iwami, N. Whangchai, Redel Gutierrez, K. Shimizu, T. Itayama

{"title":"Statistical analysis of the effects of environmental factors and fish species on class-sorted phytoplankton composition in aquaculture ponds in northern Thailand","authors":"Truc-Ly Le-Huynh, N. Iwami, N. Whangchai, Redel Gutierrez, K. Shimizu, T. Itayama","doi":"10.54279/mijeec.v4i3.247635","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.247635","url":null,"abstract":"Understanding the phytoplankton in aquaculture ponds is critical for proper pond management. Despite the importance, the relationships between phytoplankton composition, cultured fish type, season, and nutrients were not well understood. This study statistically investigated these relationships in aquaculture ponds. Data collected at 21 tilapia and 13 catfish ponds in September 2009 (wet season), December 2009 (cold season), and March 2010 (hot season) in northern Thailand were used for the analysis. The statistical analysis showed that PO4-P and NH4-N concentrations in catfish ponds were significantly higher than in tilapia ponds (p < 0.05, Wilcoxon test). The cyanobacterial abundance in catfish ponds was significantly greater than in tilapia ponds (p < 0.05, Wilcoxon test). In the hot season (March), green algae were abundant (p < 0.05), while cyanobacteria were depleted (p < 0.05). Multiple linear regression model was applied to determine important factors for statistically explaining cyanobacterial abundance. The result indicated that the best model selected by AICc included season and pond type as factors influencing cyanobacterial abundance but not nutrients. However, since the effect of nutrients was included in the difference in nutrient concentration due to the difference in fish species in the ponds, it was speculated that nutrients were insignificant as explanatory variables. Furthermore, it was hypothesized that cyanobacterial abundance was reduced in March (hot season) because the predation of cyanobacteria by tilapia may be encouraged at high temperature.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"182 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84074349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bioethanol production from low-grade konjac powder via combination of alkaline and thermal pretreatments 低品位魔芋粉碱预处理与热预处理相结合生产生物乙醇的研究

Maejo International Journal of Energy and Environmental Communication Pub Date : 2022-11-05 DOI: 10.54279/mijeec.v4i3.248262

Warichsa Kongchan, Yuwalee Unpaprom, Natthawud Dussadee, R. Ramaraj

引用次数: 0

Production of biofuel from microalgae grown in wastewater- A review 废水微藻生产生物燃料的研究进展

Maejo International Journal of Energy and Environmental Communication Pub Date : 2022-10-27 DOI: 10.54279/mijeec.v4i3.248256

K. M. Palanisamy, O. Bhat, M. O. Oteikwu, N. Govindan, G. P. Maniam, Rameshprabhu Ramaraj, Y. Unpaprom

引用次数: 0

Biomass-derived nano-catalyst for biodiesel production from waste cooking oil 废弃食用油生产生物柴油的生物质衍生纳米催化剂

Maejo International Journal of Energy and Environmental Communication Pub Date : 2022-10-09 DOI: 10.54279/mijeec.v4i3.248241

Anodar Ratchawet, P. Chaiworn

引用次数: 0

Assessing nutrient budget of ungauged catchment using intermittent water quality markers 利用间歇水质标记评估未计量集水区的营养收支

Maejo International Journal of Energy and Environmental Communication Pub Date : 2022-09-28 DOI: 10.54279/mijeec.v4i3.247534

Misigo W. S. Angalika, Seiji Suzuki, Truc-Ly Le-Huynh, T. Itayama, Wataru Tanaka

{"title":"Assessing nutrient budget of ungauged catchment using intermittent water quality markers","authors":"Misigo W. S. Angalika, Seiji Suzuki, Truc-Ly Le-Huynh, T. Itayama, Wataru Tanaka","doi":"10.54279/mijeec.v4i3.247534","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.247534","url":null,"abstract":"This study is a preliminary spatial-temporal assessment method of the ungauged catchment to determine the variation in water quality (WQ) and the land use influence on river basins’ health. The intermittent WQ data, the principal component analysis, and the redundancy analysis were used to evaluate the (dis)similarity among the 10 ungauged streams and their significance in the entire catchment. These revealed some similarities/differences in nutrient pollution and latent land-use influence on the streams’ health. There were similarities between R6-R7, R9-R10, among R1 to R4 basins, while R5 and R8 had distinct variances in their WQ dynamics. The intensive vegetable and rice production in R5, R7, R8, R9, and R10 basins were the major sources of high nutrient concentrations. The unique variations, especially in R5 and R8 basins could be attributed to other different pollution sources. Hence, it’s of great significance to carry out comprehensive research in the above 5 river basins. That is the efficiency of management practices, identification of pollution sources, and the extent to which the elevated nutrients in the streams interact with biota within the river regime. This research offers a method to evaluate WQ dynamics in relation to human interferences in river basins of a catchment with limited data under similar climatic conditions.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78878072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Factors affecting household’s willingness to pay for the fish conservation zones a case study from Khong District, Champasak Province, Laos 影响家庭为鱼类保护区付费意愿的因素——老挝占巴塞省孔县案例研究

Maejo International Journal of Energy and Environmental Communication Pub Date : 2022-09-05 DOI: 10.54279/mijeec.v4i1.247331

Salongxay Fongsamouth, Sakhone Keosoubinh, Philavanh Homsombath, Vilaphone Sounakeovongsa, Vannasinh Souvannasouk, Nitphone Senganatham, Vanphakonekham Koulavongsa

{"title":"Factors affecting household’s willingness to pay for the fish conservation zones a case study from Khong District, Champasak Province, Laos","authors":"Salongxay Fongsamouth, Sakhone Keosoubinh, Philavanh Homsombath, Vilaphone Sounakeovongsa, Vannasinh Souvannasouk, Nitphone Senganatham, Vanphakonekham Koulavongsa","doi":"10.54279/mijeec.v4i1.247331","DOIUrl":"https://doi.org/10.54279/mijeec.v4i1.247331","url":null,"abstract":"This research aims to estimate whether the WTP for fish conservation zones in terms of fish species protection areas. The authors used cross-sectional data that was collected from 369 respondents in 3 target villages in the Khong district of Champasak province Laos in 2021 and utilised WTP and maximum likelihood regression, marginal effect result for analysis. The estimate of the empirical model used for econometric analysis is based on the previously described model. This study finds that the average WTP households in target villages for fish conservation zones is 12.12 US $/household/year. The bid price, the recognition of the necessity of the fish conservation zones' knowledge, and average monthly income all positively impact WTP for fish conservation zones with a statistically significant impact. The authors conclude that the fish conservation zones might increase fish species in the study area. This valuation can be calculated as the cost to improve the quality of establishing fish conservation zones by multiplying the number of people in three villages of 768 households, which is the value expectation of the economy at 9,310 US $/year. However, improving public goods conservation now is the duty of everybody, so if we would like to strengthen fish conservation zones more efficiently than ever, we may find more suitable and sustainable alternatives.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73970382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Beneficiation of organic black onion and lemon peel by-products through extraction and investigation of bioactive compounds 有机黑洋葱和柠檬皮副产物生物活性成分的提取和研究

Maejo International Journal of Energy and Environmental Communication Pub Date : 2022-08-28 DOI: 10.54279/mijeec.v4i2.248042

P. Bhuyar, Sarocha Jaichanta, Winitra Leelapattana, Suthira Sitthikun, N. Dussadee, R. Ramaraj, Y. Unpaprom

{"title":"Beneficiation of organic black onion and lemon peel by-products through extraction and investigation of bioactive compounds","authors":"P. Bhuyar, Sarocha Jaichanta, Winitra Leelapattana, Suthira Sitthikun, N. Dussadee, R. Ramaraj, Y. Unpaprom","doi":"10.54279/mijeec.v4i2.248042","DOIUrl":"https://doi.org/10.54279/mijeec.v4i2.248042","url":null,"abstract":"Much research on the shallot phytochemical is currently employed in various disciplines, such as medical reasons. Shallot (Allium ascalonicum) is a plant species belonging to the family Amaryllidaceae. It is a native plant grown in the North and Northeast region of Thailand. The present study aimed to determine the extracts' yield and antioxidant properties of black shallots made from fresh shallots. The black shallots were extracted with digestion by water, 47.5% and 95% ethanol at 50 ℃ for 1, 3 and 5 hours. The result discovered that black shallot extraction with digestion by water for 5 hours showed the highest weight of extracts (3.620 g). The determination of antioxidant activity by DPPH was observed, and extraction by water for 5 hours gave the highest percentage of inhibition. It was equal to 84.61%, which is not different from the digestion of 95% ethanol for 1 hour, with 83.48%. Similarly, the most outstanding value of IC50 was obtained from extraction with 95% ethanol for 1 and 5 hours with 21.30 mg/ml and 20.52 mg/ml. In terms of monitoring, the digestion method evaluated the productivity of pectin extracts from citrus peel. Hydrochloric acid (0.100, 0.050 and 0.025 M) was used as a solvent at 95 ℃ for 30, 60 and 90 minutes. The pectin extract by 0.1 M hydrochloric acid for 90 minutes gave the highest extract (5.237 g). The preliminary testing of cosmetic production was done by mixing black shallot extracts and pectin from citrus peels, and the two substances can be combined. Still, without adding preservatives, they could cause contamination in cosmetic samples.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"126 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76703127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0