VNU Journal of Science: Earth and Environmental Sciences最新文献_第5页

Recycling Sprout By-product as Organic Growing Media 回收嫩芽副产品作为有机生长介质

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-09-27 DOI: 10.25073/2588-1094/vnuees.4817

Nguyen Ngan Ha, Le Anh Tuan

{"title":"Recycling Sprout By-product as Organic Growing Media","authors":"Nguyen Ngan Ha, Le Anh Tuan","doi":"10.25073/2588-1094/vnuees.4817","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4817","url":null,"abstract":"Sprout by-product is a nutrient-rich organic material but difficult to biodegrade in natural environmental conditions. Sprout by-product includes used media, part of the sprout stems and roots left after harvest. The accumulation of this waste with increasing amounts over time can cause serious environmental pollution in production areas. To reduce waste volume at the resource, this study provided several treatment methods of sprout by-product to effectively recycle it for safe sprout production. The treatment methods proposed for sprout by-product were i) To incubate with microbial product called as EMUNIV for 30 days to create the first organic growing medium - GT2, pre-treat with 1% lime solution; ii) Mix with dried soybean husk at a ratio of 1:1 to create the second organic growing medium - GT3; or iii) Mix with dried soybean husk in a 1:1 ratio to create the third organic growing medium - GT4. The results showed that the created organic growing media had neutral pH, high organic matter, and nitrogen, phosphorus, potassium content. The treated substrates were not contaminated with some heavy metals (Pb, Cd, As) and pathogenic microorganisms (E.coli, Salmonella). Raphanus sativus var. radicula sprouts grown on new organic media had the seed germination rate of 95-98%, normal growing with higher productivity than the control from 1.14 to 1.2 times, crude protein, vitamin C content also higher than the control. Sprouts grown using this recycled media were assessed safe because of not being polluted by heavy metals (Pb, Cd), pathogenic microorganisms (E.coli, Salmonella) and nitrate. The treatment of sprout by-product according to the method for creating organic medium GT2 was most suitable and recommended for sprout production areas. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132415568","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

Emissions Factors of Air Pollutants from Rice Straw Burning-hood Experiments 秸秆焚烧试验大气污染物排放因子研究

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-09-26 DOI: 10.25073/2588-1094/vnuees.4848

Pham Thi Hong Phuong, Nghiem Trung Dung, Pham Thi Mai Thao, Trinh Thi Tham

{"title":"Emissions Factors of Air Pollutants from Rice Straw Burning-hood Experiments","authors":"Pham Thi Hong Phuong, Nghiem Trung Dung, Pham Thi Mai Thao, Trinh Thi Tham","doi":"10.25073/2588-1094/vnuees.4848","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4848","url":null,"abstract":"Abstract: The burning of rice straw produces a significant amount of particulate matter (PM) and gaseous air pollutants on a regional and global scale. In this study, the hood experiments were conducted to investigate the emission of air pollutants from rice straw burning (RSB). Samples of PM were collected isokinetically following the U.S. EPA methods 1, 1A, and 5. Gaseous pollutants were directly measured using a flue gas analyzer (Testo 350 XL). Emission factors (EF) (g.kg-1) determined for PM, CO2, CO, and SO2 were 17 ± 3.8, 1399 ± 228, 68 ± 22, and 1.5 ± 0.4, respectively meanwhile NO and NO2 were not detected in the flue gas. It was observed that flaming is the main phase in the process of RSB. The total emission from rice straw burning of 13 provinces in the Mekong River Delta of Vietnam in 2020 was estimated using the EF obtained from the hood experiments. The result shows that Kien Giang, An Giang, and Dong Thap were the high emission group in the Mekong River Delta, contributing 19%, 17%, and 14% to total emissions. The results of this study provide a scientific basis for further studies to determine EF from rice straw open burning in the fields and find sustainable measures to control this activity. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116015000","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

Coastal Vulnerability Assessment in Son Tra – Cua Dai region 松川台地区沿海脆弱性评价

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-09-26 DOI: 10.25073/2588-1094/vnuees.4842

Dang Kinh Bac, Ngo Chi Cuong, Ngo Van Liem, Dang Van Bao

引用次数: 0

Sea Surface Temperature Changes Over the Twentieth and Twenty-First Centuries in East Vietnam Sea Simulated by Multi CMIP5 Models 多个CMIP5模式模拟的20世纪和21世纪东越南海海面温度变化

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-09-26 DOI: 10.25073/2588-1094/vnuees.4850

L. Thien

{"title":"Sea Surface Temperature Changes Over the Twentieth and Twenty-First Centuries in East Vietnam Sea Simulated by Multi CMIP5 Models","authors":"L. Thien","doi":"10.25073/2588-1094/vnuees.4850","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4850","url":null,"abstract":"The East Vietnam Sea plays important roles in the Pacific Northwest region. The projection of changes in sea surface temperature (SST) in these regions is an important research topic in marine science. However, this is a very difficult problem due to the lack of available long-term projection data. Recently, with the development of numerical modeling technology, it has become an important way to help us understand climate change. This paper focuses on studying the SST changes in the East Vietnam Sea during the history of the 20th century and the change under 3 emission scenarios in the 21st century based on a combination of 20 global models (GCM) from Phase 5 of the the Climate Model Intercomparison Project (CMIP5) and together with the observed data set. Compared with the observed data, most of the global GCMs models can simulate well the spatial and seasonal changes of the SST over the East Vietnam Sea regions. The spatial and annual SST trends over the the 20th century based on both observations and multimodel ensemble averages show that the warming trend of SST over most of the East Vietnam Sea with the largest warming trend occurred in the center and southern regions of the East Vietnam Sea. However, compared with the observation, CMIP5 underestimated SST trends over most regions of East Vietnam Sea. In addition, there is a consistency between the CMIP5 and the spatial and seasonal observations of the SST trend in the East Vietnam Sea areas. The future SST projections for East Vietnam Sea indicate that RCP 4.5 and RCP 8.5 exhibit a gradual increase in annual SST during the 21st century at a rate of 0.1 °C and 0.3 °C per 10 years respectively. The lowest emission mitigation scenario, RCP 2.6, produces the lowest rate of warming. By the end of the 21st century, the annual SST is projected to increase by 0.5-2.0 °C in 3 emission scenarios of typical representative concentration pathways (RCP) 8.5, 4.5 and 2.6. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131768229","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

Evaluation of the Ability to Treat Saline and Acid Sulfate Soils of Biochar from Rice Husks in Greenhouse Conditions 温室条件下稻壳生物炭处理盐碱和硫酸土壤的能力评价

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-09-26 DOI: 10.25073/2588-1094/vnuees.4871

T. T. Huong, Nguyen Xuan Tong, Nguyen Phuc Thuy Duong, Nguyen Van Nghia, V. Hai, Nguyen Thi Thanh Binh

{"title":"Evaluation of the Ability to Treat Saline and Acid Sulfate Soils of Biochar from Rice Husks in Greenhouse Conditions","authors":"T. T. Huong, Nguyen Xuan Tong, Nguyen Phuc Thuy Duong, Nguyen Van Nghia, V. Hai, Nguyen Thi Thanh Binh","doi":"10.25073/2588-1094/vnuees.4871","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4871","url":null,"abstract":"The purposes of this study were to i) Examine the dynamics of physicochemical parameters of saline acid sulfate soil as influenced by biochar made from rice husk; and ii) Evaluate the influence of biochar on the soil quality index. A greenhouse experiment was carried out by mixing biochar with the tested soil at ratios of 0; 0.7; 1.5; 3, and 6% (w/w) and incubating for 100 days. Experimental soil samples were taken on days 5, 15, 30, 60, and 100 to analyze for 11 physicochemical parameters. The soil quality index (SQI) was calculated based on the principal component/factor analysis (PCA/FA). The results showed that biochar increased the exchangeable concentration of K, Mg, Ca, and pH value while reducing the exchangeable concentration of Fe, and Al, as well as the values of Cl-, H+, and exchange acidity in the soil. Biochar changed the electrical conductivity (EC) and Na parameters, increasing them in the first few measurements while decreasing them in the last measurements. Biochar increased the SQI of the tested soil, even with a low biochar application rate of 0.7% after 100 days of the experiment. The study suggests that biochar made from rice husk could be a potential amendment for ameliorating saline acid sulfate soil. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122904623","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

Study Model for Information Reconstruction on Cloud Contaminated Area for Single Multispectral Remote Sensing Sentinel-2 Imagery using Generative Adversarial Network 基于生成对抗网络的哨兵2号单幅多光谱遥感影像云污染区信息重建模型研究

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-09-26 DOI: 10.25073/2588-1094/vnuees.4815

Do Thi Nhung, Pham Vu Dong, Bui Quang Thanh, Pham Van Manh

{"title":"Study Model for Information Reconstruction on Cloud Contaminated Area for Single Multispectral Remote Sensing Sentinel-2 Imagery using Generative Adversarial Network","authors":"Do Thi Nhung, Pham Vu Dong, Bui Quang Thanh, Pham Van Manh","doi":"10.25073/2588-1094/vnuees.4815","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4815","url":null,"abstract":"Cloud and cloud shadow cause information loss in optical remote sensing analysis. South East Asia, especially Vietnam, Sentinel-2 imagery has short re-visit cycle and observations tend to be contaminated with cloud and cloud shadow. Traditional cloud removal methods require close date multi-temporal data to avoid seasonal land cover changes. In this study, a method of integrating Deep Convolutional Neural Networks (DCNN) and Generative Adversarial Network (GAN) was proposed. This machine learning model estimates the information loss over cloud contaminated areas on a single Sentinel-2 image. The results show that for images with cloud cover rate under 25%, our model can reconstruct cloudless images with PSNR (25 – 40 dB) and SSIM (0.86 – 0.93) compared to real clear images. On the other hand, with cloud cover rate up to 40%, the model performance will be affected heavily by the distribution of cloud and cloud shadow areas. By investigating DCNN and GAN, our method has proven to be an effective tool to remove cloudy images with low and medium rates, which enriches the clear optical remote sensing data sources for environment monitoring. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"253 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132825292","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

Investigate the Water Activity of Different Solutions According to Solute Concentration for Preparing Wet Filtration Solution 根据溶质浓度考察不同溶液的水活度，制备湿式过滤液

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-09-26 DOI: 10.25073/2588-1094/vnuees.4801

Nguyen Ngoc Minh Chau, Pham Thanh Dong, Nguyen Minh Viet, Do Dinh Khai, Nguyễn Thi Thuy, Trinh Thi Phong Huong, Tran Duc Khanh, Vu Ha Giang, Hoang Van Ha

引用次数: 0

Apply Machine Learning to Predict Saltwater Intrusion in the Ham Luong River, Ben Tre Province 应用机器学习预测咸隆河咸水入侵

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-09-26 DOI: 10.25073/2588-1094/vnuees.4852

Phạm Ngọc Hoài, Pham Bao Quoc, Trần Thành Thái

{"title":"Apply Machine Learning to Predict Saltwater Intrusion in the Ham Luong River, Ben Tre Province","authors":"Phạm Ngọc Hoài, Pham Bao Quoc, Trần Thành Thái","doi":"10.25073/2588-1094/vnuees.4852","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4852","url":null,"abstract":"Saltwater intrusion is a major problem particularly in the Mekong Delta, Việt Nam. In order to better manage the salinity problem, it is important to be able to predict the saltwater intrusion in rivers. The objective of this research is to apply several machine learning algorithms, including Multiple Linear Regression (MLR), Random Forest Regression (RFR), Artificial Neural Networks (ANN) for predicting the saltwater intrusion in Ham Luong River, Ben Tre Province. The input data is is composed of 207 weekly saltwater intrusion data points from 2012 to 2020. Yearly salinity was measured during the 23 weeks of the dry season, from January to June. The Nash - Sutcliffe efficiency coefficient (NSE), Root Mean Squared Error (RMSE), and Mean Absolute Error (MAE) are used to evaluate the performances of machine learning algorithms. The research results indicated that the ANN model achieved a high performance for salinity forecasting with NSE = 0.907, RMSE = 0.11, MAE = 0.08 for training period, NSE = 0.842, RMSE = 1.16, MAE = 0.11 for testing period. The findings of this study suggest that the ANN algorithm is a promising tool to forecast salinity in Ham Luong River. \u0000 \u0000 \u0000 \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128609256","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

Iron and Manganese Removal from Wastewater by Constructed Wetlands Planted with Caladium bicolor 双色钙人工湿地去除废水中的铁和锰

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-06-27 DOI: 10.25073/2588-1094/vnuees.4861

N. M. Phuong, Do Thi Hai, N. Thanh, B. T. Anh

{"title":"Iron and Manganese Removal from Wastewater by Constructed Wetlands Planted with Caladium bicolor","authors":"N. M. Phuong, Do Thi Hai, N. Thanh, B. T. Anh","doi":"10.25073/2588-1094/vnuees.4861","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4861","url":null,"abstract":"Constructed wetlands (CWs) have been applied to treat various wastewater types including domestic wastewater, livestock wastewater, industrial wastewater and acid mine drainage with the advantages of low cost, environmentally-friendly technology and high treatment efficiency. Mining wastewater with the high content of heavy metals often causes negative impacts on the ecosystems and human health. In this study, the capacity of using limestone, hydrolyzed rice husk as filter materials and the CWs planted with Caladium bicolor to treat iron and manganese in artifical wastewater treatment are evaluated. The wetland model has the size of length x width x height of 50 cm x 15 cm x 20 cm. 10 liters of the synthetic wastewater were used and initial Fe and Mn concentrations varied from 5, 10, 15, 20 and 25 mg/L. The results showed that limestone and hydrolyzed rice husk with the weight ratio of 5 : 2.5 (kg) had good ability to remove Fe and Mn with treatment efficiencies of approximately 99.8% after 144 hours. During a 24-hour retention time, the Fe and Mn concentrations in the wastewater decreased rapidly in CWs and the initial Fe and Mn concentrations affected treatment performance. When the initial Fe and Mn concentrations were below 20 mg/L, treatment efficiencies of Fe and Mn reached about 99% after 144 hours in the CWs and Fe and Mn concentrations met the national regulation QCVN 40: 2011/BTNMT, column B. The study highlights the potential applications of C. bicolor in CWs with the use of natural limestone and hydrolyzed rice husk as substrates in treatment of iron and manganese-contaminated wastewater. \u0000Keywords: Constructed wetlands, Caladium bicolor, limestone, rice husk, iron, manganese.","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"421 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131522622","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

The Efficiency of Air-lift Bioreactor Using PVA-gel Carrier Materials to Treat Organic Components in Artificial Wastewater pva -凝胶载体气升式生物反应器处理人工废水中有机组分的效果研究

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-06-27 DOI: 10.25073/2588-1094/vnuees.4808

Nguyen Truong Quan, Vu Ngoc Duy, Pham Hoang Giang, Le Van Chieu, Tran Manh Hai

引用次数: 0