Vietnam Journal of Science, Technology and Engineering最新文献_第3页

Removal of greenhouse gas in biofilter using organic and inorganic media 利用有机和无机介质去除生物过滤器中的温室气体

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-31 DOI: 10.31276/VJSTE.63(1).83-89

N. T. Tung, W. Chiemchaisri, C. Chiemchaisri, Samunya Sanguanpak

{"title":"Removal of greenhouse gas in biofilter using organic and inorganic media","authors":"N. T. Tung, W. Chiemchaisri, C. Chiemchaisri, Samunya Sanguanpak","doi":"10.31276/VJSTE.63(1).83-89","DOIUrl":"https://doi.org/10.31276/VJSTE.63(1).83-89","url":null,"abstract":"Moreover, we also investigated N 2 O conversion, which occurred simultaneously with CH 4 oxidation, during gas treatment in the biofilter. Abstract: A biofilter using organic (compost) and inorganic (pumice, porous silica pellet or poremat) media was applied to the removal of methane (CH 4 ) and nitrous oxide (N 2 O) to minimize the impact of off-gasses from municipal solid waste disposal global. The objective was to determine the appropriate biofilter media for CH 4 oxidation and N 2 O conversion. The off gas (59.6% CH 4 , 1.0% N 2 O) was fed simultaneously with air (1:3 ratio) into the biofilter. CH 4 oxidation and N 2 O conversion rates were observed over a 101-day period through the analysis of gas concentration along the biofilter’s depth using gas chromatography. Higher CH 4 oxidation in the biofilters containing organic and inorganic media was achieved, especially for the compost-poremat biofilter with 70.1 g CH 4 /m 3 /d realised. The most active methane oxidation zone was found near the gas inlet at the bottom of the biofilter. The presence of inorganic material helped promote aerobic conditions for CH 4 oxidation, especially during the initial period. N 2 O was also more completely removed with the biofilter containing inorganic media. Higher methanotrophic activities in matured biofilter media and the presence of methanotrophs type I, which prefer oxygen-rich conditions, were confirmed.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"173 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78911458","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

Sustainability assessment of community-based water resource management of irrigation systems for agriculture 基于社区的农业灌溉系统水资源管理的可持续性评估

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-31 DOI: 10.31276/VJSTE.63(1).90-96

H. T. Huong, P. N. Ánh, Vietnam Environment

{"title":"Sustainability assessment of community-based water resource management of irrigation systems for agriculture","authors":"H. T. Huong, P. N. Ánh, Vietnam Environment","doi":"10.31276/VJSTE.63(1).90-96","DOIUrl":"https://doi.org/10.31276/VJSTE.63(1).90-96","url":null,"abstract":": To study community-based water resource management (CbWRM) of irrigation for agriculture, the participation of the community in the management of the irrigation system must be considered. CbWRM is the cooperation between a farming organization (the water-using cooperative group) and state-related organizations (such as the Department of Water Resources Management and commune-level authorities) in the process of the operation and management of water. In the CbWRM model, the community participates in the selection and election of the management board, meetings to collect ideas to build a CbWRM model, and financial contributions to water use fees. The community also participates in the annual operational planning of water use. Therefore, this study aimed to develop indicators to assess the sustainability of the CbWRM model of irrigation for agriculture in the Hau Giang province, Vietnam. With an assessment result of 0.54 (relatively sustainable), this study shows a picture of water resource management in general and community participation in particular. These research results can help managers and policymakers promote community participation to achieve high-efficiency water resource management in the agriculture of the Hau Giang province.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82092625","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

Meningococcal disease in one soldier patient: case report from Vietnam 越南士兵一例脑膜炎球菌病病例报告

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-31 DOI: 10.31276/VJSTE.63(1).54-58

N. Viet, Nguyen Minh Nam, N. V. Trung, D. T. Anh, H. Tong

引用次数: 1

Application of an innovative draw solute in forward osmosis (FO) processes 一种创新的吸收溶质在正向渗透(FO)过程中的应用

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-16 DOI: 10.31276/VJSTE.63(1).30-35

N. Nguyen, H. Nguyen, Shiao‐Shing Chen, X. Bui

{"title":"Application of an innovative draw solute in forward osmosis (FO) processes","authors":"N. Nguyen, H. Nguyen, Shiao‐Shing Chen, X. Bui","doi":"10.31276/VJSTE.63(1).30-35","DOIUrl":"https://doi.org/10.31276/VJSTE.63(1).30-35","url":null,"abstract":": More attention is being paid to forward osmosis (FO) as a breakthrough technology to tackle environmental pollution due to advantages such as high contaminant removal and low energy consumption. Nevertheless, FO applications remain limited by the lack of ideal draw solutes that simultaneously achieve high permeate flux and low salt leakage flux. Therefore, this paper aims to increase water flux while maintaining low reverse salt diffusion by using a low concentration of a highly charged organic EDTA compound coupled with inorganic NaCl salt as a novel draw solute. Results of the FO performance revealed that a draw solute of 0.3 M EDTA-2Na mixed with 0.6 M NaCl yielded a higher water flux (J w =8.82 l/m 2 h) when compared to 0.9 M NaCl only (J w =7.61 l/m 2 h). Moreover, the FO-membrane distillation system produced good quality drinking water with a total dissolved solid (TDS) of <5 mg/l from the permeate stream originating from influent brackish water with a TDS of 6000 mg/l. The analysis results from scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDX) images observed a cake layer of NaCl on the FO membrane surface.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89218810","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

Diversity of zooplankton and benthic macroinvertebrates of estuarine coastal waters in Tien Giang province, southern Vietnam 越南南部天江省河口沿海水域浮游动物和底栖大型无脊椎动物的多样性

Vietnam Journal of Science, Technology and Engineering Pub Date : 2020-12-31 DOI: 10.31276/vjste.62(4).03-07

Thuy Lan Chi Nguyen, T. Dinh, T. Dang, A. Pham, Thanh H. T. Nguyen, T. T. Huynh, N. Tran

{"title":"Diversity of zooplankton and benthic macroinvertebrates of estuarine coastal waters in Tien Giang province, southern Vietnam","authors":"Thuy Lan Chi Nguyen, T. Dinh, T. Dang, A. Pham, Thanh H. T. Nguyen, T. T. Huynh, N. Tran","doi":"10.31276/vjste.62(4).03-07","DOIUrl":"https://doi.org/10.31276/vjste.62(4).03-07","url":null,"abstract":": The Tien Giang province is located in the tropical climate zone of the Mekong delta. In this study, the diversity of zooplankton and benthic macroinvertebrates were investigated in the estuarine coastal waters of the Tien Giang province of southern Vietnam. 10 sites were observed over six time periods from 2019 (March, May, September, and November) and 2020 (March and May). The taxonomic richness, abundance, and diversity index were applied to this biodiversity assessment of the zooplankton and benthic macroinvertebrates. The results of the assessment showed that 30 species of zooplankton and 18 species of benthic macroinvertebrates were found in the study area. The density of zooplankton at each site ranged from 6 to 93 individuals/sample, while the density of benthic macroinvertebrates at each site fluctuated from 3 to 12 individuals/sample. The Shannon-Wiener diversity index of zooplankton fluctuated from 1.02 to 1.58 and that of the benthic macroinvertebrates ranged between 0.91 and 1.33. Besides, statistical analysis showed that the species richness of the zooplankton and benthic macroinvertebrates positively correlated with their density (r=0.2283-0.6423). This study contributes to the diversity information of zooplankton and benthic macroinvertebrates, which can be used to position the sustainable management of natural resources and evaluate the natural feed sources for aquaculture in this estuarine area.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75843543","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

Flood inundation mapping using Sentinel-1A in An Giang province in 2019 基于Sentinel-1A的2019年安江省洪水淹没制图

Vietnam Journal of Science, Technology and Engineering Pub Date : 2020-12-31 DOI: 10.31276/vjste.62(4).36-42

T. Nguyen, Trung Chinh Nguyen, T. Nguyen, T. Doan

{"title":"Flood inundation mapping using Sentinel-1A in An Giang province in 2019","authors":"T. Nguyen, Trung Chinh Nguyen, T. Nguyen, T. Doan","doi":"10.31276/vjste.62(4).36-42","DOIUrl":"https://doi.org/10.31276/vjste.62(4).36-42","url":null,"abstract":"a given flood event. Apart from initial studies, several research works have concentrated on improving estimation accuracy [11-14]. Review articles [15, 16] are also available. Since the mid Abstract: An Giang is one of the provinces in the Mekong delta that is greatly affected by flood events, which brings damage and devastation to life and property. This study practices the application of Sentinel-1A images to monitor the distribution of flood depths in the An Giang province in 2019 as well as applies regression correlation and thresholding to scattering value analysis. The research results indicated the exponential regression model on the VV polarization images had correlation coefficients (r) in August, September, and October ranging from 0.8398 to 0.9764 and determination coefficients (R 2 ) ranging from 0.7896 to 0.9533. Results from the map of current flood depth showed that the flood depth ranged from 0-250 cm, which corresponded to four flood levels. The flood area increased from August to October with the largest flooded area being 89,606.82 ha (accounting for 26.15%) mainly on rice lands and in eight urban districts including An Phu, Tinh Bien, Chau Thanh, Chau Phu, Phu Tan, Tri Ton, Chau Doc, and Long Xuyen city. The limit of flood depth determined by using the Sentinel-1A images was below 145 cm. Above this value, the scattering in the image is not significantly different from the actual submerged depth.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82129116","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: 2

Assessment of phosphorus release from alluvial sediments using single extraction: a case study in Can Gio, Southern Vietnam 单次提取对冲积沉积物中磷释放的评估:以越南南部芹焦为例

Vietnam Journal of Science, Technology and Engineering Pub Date : 2020-12-31 DOI: 10.31276/vjste.62(4).60-64

T. Tran, T. T. Ngo, Ngoc Tuyen Nguyen, Bich Chau Tran, M. Truong

引用次数: 1

Single and combined effects of Di-2-ethylhexyl phthalate and bisphenol A on life traits of the tropical micro-crustacean Ceriodaphniacornuta 邻苯二甲酸二-2-乙基己酯和双酚A对热带微甲壳类Ceriodaphniacornuta生命特性的单独和联合影响

Vietnam Journal of Science, Technology and Engineering Pub Date : 2020-12-31 DOI: 10.31276/vjste.62(4).23-29

V. Nguyen, Manh-Ha Bui, Emilie Strady, Thuy-Chung Kieu-le, Ba-Trung Bui, T. Dao, Ho Chi Minh city Vietnam Resources

{"title":"Single and combined effects of Di-2-ethylhexyl phthalate and bisphenol A on life traits of the tropical micro-crustacean Ceriodaphniacornuta","authors":"V. Nguyen, Manh-Ha Bui, Emilie Strady, Thuy-Chung Kieu-le, Ba-Trung Bui, T. Dao, Ho Chi Minh city Vietnam Resources","doi":"10.31276/vjste.62(4).23-29","DOIUrl":"https://doi.org/10.31276/vjste.62(4).23-29","url":null,"abstract":": Plastics, plastic additives, and their emission have attracted significant attention and concern both socially and scientifically. Di-2-ethylhexyl phthalate (DEHP) and bisphenol A (BPA) are two of the many plastic additives widely found in aquatic environments, which can have severe impacts on aquatic animals like micro-crustaceans. Therefore, this study assessed the chronic effects of DEHP and BPA, both individually and jointly, at environmental concentrations (e.g. 50 and 500 µg/l) on the survival rate, reproduction, and growth of the tropical micro-crustacean Ceriodaphnia cornuta . We found that each of the two plastic additives, and a mixture of the two, had some influence on the survivorship of C. cornuta . While DEHP marginally enhanced the reproduction of the animals, BPA strongly inhibited it. Additionally, the mixture of DEHP and BPA caused a synergistic effect on reproduction but an antagonistic effect on the growth of C. cornuta . Both DEHP and BPA induced a significantly longer body of C. cornuta when exposed to these plastic additives. Our results showed that the tropical micro-crustacean C. cornuta is more sensitive to DEHP and BPA than the temperate micro-crustacean D. magna in relation to body length development and reproductive characteristics. Our findings enrich the knowledge of DEHP and BPA toxicity to tropical micro-crustaceans. Besides, our results are also of significant value to freshwater monitoring and environmental risk assessments of plastic additives.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73997896","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: 2

Removal of methylene blue from simulated wastewater by Carica papaya wood biosorbent 番木瓜木生物吸附剂去除模拟废水中的亚甲基蓝

Vietnam Journal of Science, Technology and Engineering Pub Date : 2020-12-31 DOI: 10.31276/vjste.62(4).08-17

Thi Nhu Tuyen Nguyen, T.M.H. Huynh, T. To

引用次数: 2

The zoning of surface water quality by WQI index in the Tien Giang province, Vietnam 用WQI指数划分越南天江省地表水水质

Vietnam Journal of Science, Technology and Engineering Pub Date : 2020-12-31 DOI: 10.31276/vjste.62(4).71-76

N. Anh, Ngoc H. Bui

引用次数: 0