Science & Technology Development Journal - Science of The Earth & Environment http://stdjsee.scienceandtechnology.com.vn/index.php/stdjsee <p><span id="result_box" class="" lang="en"><span title="Tạp chí Phát triển Khoa học và Công nghệ (PTKH&amp;CN) của Đại học Quốc gia thành phố Hồ Chí Minh (ĐHQG-HCM) được thành lập từ năm 1997, ra số đầu tiên vào tháng 1 năm 1998. Từ năm 2006 Tạp chí đã"><strong>Science and Technology Development Journal</strong> (STDJ), Vietnam National University - Ho Chi Minh City (VNU-HCM) was established in 1997. And the first issue was published in January 1998 with </span><span title="đăng ký mã số chuẩn quốc tế ISSN 1859-0128.">ISSN 1859-0128. </span><span title="Từ đó cho đến nay, Tạp chí PTKH&amp;CN đã trở thành diễn đàn khoa học quan trọng nhất của đội ngũ cán bộ nghiên cứu, giảng viên, nghiên cứu sinh của ĐHQG-HCM và cũng là diễn đàn khoa học công nghệ đáng tin cậy của">Since then, STDJ has become the most important scientific forum of scientists from VNU-HCM as well as</span><span title="nhiều nhà nghiên cứu, giảng viên các trường đại học khác tại Việt Nam."> other universities. </span><span title="Tạp chí đã trải qua 20 năm phát triển và đã trở thành nhịp cầu giao lưu khoa học, cũng như làm phong phú tài liệu tham khảo cho đội ngũ giảng viên, nghiên cứu sinh, sinh viên ĐHQG-HCM nói riêng và các Trường đại">The magazine has undergone 20 years of development and has become a bridge for scientific exchanges, as well as enriching reference materials for the faculty, doctoral students, students of VNU-HCM in particular and other universities, institutes... </span></span></p> <p><span class="" lang="en"><span title="Tạp chí đã trải qua 20 năm phát triển và đã trở thành nhịp cầu giao lưu khoa học, cũng như làm phong phú tài liệu tham khảo cho đội ngũ giảng viên, nghiên cứu sinh, sinh viên ĐHQG-HCM nói riêng và các Trường đại"><strong>Science &amp; Technology Development Journal - Science of The Earth &amp; Environment</strong> (STDJSEE) (2588-1078) is a sister journal of <span id="result_box" class="" lang="en"><span title="Tạp chí Phát triển Khoa học và Công nghệ (PTKH&amp;CN) của Đại học Quốc gia thành phố Hồ Chí Minh (ĐHQG-HCM) được thành lập từ năm 1997, ra số đầu tiên vào tháng 1 năm 1998. Từ năm 2006 Tạp chí đã">Science and Technology Development Journal since 2017. This <span title="Khoa học Xã hội và Nhân văn, Kinh tế luật và Khoa học Quản lý, Khoa học Trái đất và Môi trường tương ứng với 5 chuyên san chuyên ngành của Tạp chí.">specialized</span> journal will focus on to Science of The Earth &amp; Environment. </span></span></span></span></p> <p><span class="" lang="en"><span title="Tạp chí đã trải qua 20 năm phát triển và đã trở thành nhịp cầu giao lưu khoa học, cũng như làm phong phú tài liệu tham khảo cho đội ngũ giảng viên, nghiên cứu sinh, sinh viên ĐHQG-HCM nói riêng và các Trường đại"><span class="" lang="en"><span title="Tạp chí Phát triển Khoa học và Công nghệ (PTKH&amp;CN) của Đại học Quốc gia thành phố Hồ Chí Minh (ĐHQG-HCM) được thành lập từ năm 1997, ra số đầu tiên vào tháng 1 năm 1998. Từ năm 2006 Tạp chí đã">This journal will be published 2 issues per year. </span></span></span></span>&nbsp;</p> Viet Nam National University Ho Chi Minh City en-US Science & Technology Development Journal - Science of The Earth & Environment 2588-1078 <p>Copyright The Author(s) 2018. This article is published with open access by Vietnam National University, Ho Chi Minh city, Vietnam. This article is distributed under the terms of the&nbsp;<a href="https://creativecommons.org/licenses/by/4.0/" target="_blank" rel="noopener">Creative Commons Attribution License (CC-BY 4.0)</a> which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.&nbsp;</p> Study on the proposal of a community of freshwater aquaculture and vegetable farming in An Giang http://stdjsee.scienceandtechnology.com.vn/index.php/stdjsee/article/view/505 <p>In recent years, fish farming (<em>Pangasianodon hypophthalmus</em>) an important contribution to the economy of Vietnam in general and the Mekong Delta provinces in particular. However, along with economic development issues is the problem of environmental pollution and disease caused by waste from fish farming operations. The optimal solution to this problem is the wastewater treatment of aquaculture. To the aquaculture industry in general and the fish farming profession in particular sustainable development, and to protect the natural environment, the research group conducts a symsanitary models of livelihoods symbiosis between freshwater aquaculture operations and vegetable farming. This model functioned as a way to reuse water and nutrients discharged from aquaculture activities, which caters for vegetable farming. The efficiency of the model is to minimize a large amount of solid waste disregarded directly to the receiving source, which was 315.098 kg. The quality of wastewater had been improved after releasing it to the source. The total amount of carbon (TOC), nitrogen and phosphorus was 7.56%, 8.27% and 0.64% respectively, all of which meet the standard index of waste discarded directly into the environment. Thus, the wastewater treatment ponds with tree water morning glory contribute to reducing pollution to water sources but also contribute to reuse components of waste from fish pond provides nutrients for plant water morning glory, increased efficiency, and the metabolic component of fish feed. In addition, the model also brings additional income for households with 24.9 million VN dong after every fish breeding in comparison with the traditional farming model.</p> Thu Hong Anh Nguyen Tran Thi Hieu Tra Van Tung Nguyen Viet Thang Huyen Khon Nguyen Le Quoc Vi Nguyen Thi Phuong Thao Le Thanh Hai ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 2020-04-05 2020-04-05 4 1 115 127 10.32508/stdjsee.v4i1.505 title description none g Assessing drought from satellite data to support agricultural production http://stdjsee.scienceandtechnology.com.vn/index.php/stdjsee/article/view/510 <p>Drought is one of the disasters causing the problems to the economy and social life of people, especially where agriculture is the main source of income. The paper presents the results of studying the application of optical satellite images to investigate the drought situation for the southern part of Binh Phuoc province for perennial cropland, the main agricultural crop of the province. The image used is Landsat 8 of the dry season month 2015. The method of drought assessment is based on the relationship of surface temperature, and the Normalization Difference Vegetation Index (NDVI) integrated into the Temperature-Vegetation Dryness Index TVDI. In particular, the NDVI index is determined from the red and near-infrared bands, and the surface temperature is determined from the thermal infrared band of Landsat 8 images. The results show that the whole area of southern Binh Phuoc has drought area accounting for 54.9% of the total area, of which the majority is mild drought level 38.3%, high and serious level is 16.7%. About the area of perennial land has drought area accounted for 33.76% of the total area, of which Dong Xoai town has the highest percentage of drought-affected areas compare to other districts. The results of the study aimed to identify drought areas with different levels so that managers can promptly take measures to protect agricultural crops and to ensure people's livelihoods in the global climate change trend seriously affecting the localities today.</p> Van Tran Thi Toi Nguyen Duong Lam Huynh Phan Thi Diem Ha Nguyen Ngan Bao Ha Duong Xuan ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 2020-05-04 2020-05-04 4 1 First First 10.32508/stdjsee.v4i1.510 title description none g Study on the use of sludge farming of catfish as organic fertilizer and evaluate its effectiveness in agriculture http://stdjsee.scienceandtechnology.com.vn/index.php/stdjsee/article/view/502 <p>The purpose of this study is to reuse fishpond sediment to produce organic fertilizer for planting maize. The sludge was mixed with rice husk and Composted under aerobic conditions. The effectiveness of Compost on planting maizes was assessed by adding to maizes with and without combination chemical fertilizers as different dosages as recommendations. The amounts of Compost adding for maizes were 10 and 20 tons/ha. Maize growth, characteristics of corn, and soil physical and chemical parameters such as bulk density, soil aggregate stability, the volume of moisture, and useful moisture of soil were measured and evaluated. The results showed that the quality of organic fertilizer produced from waste sludge met Vietnamese standard (QCVN:2018/BNNPTNT) for adding to crops. Applying organic fertilizer with the quantity of 20 tons/ha to combine with the recommendation of inorganic fertilizer amount for planting maizes increased the yield. Moreover, 20 ton/ha of organic fertilizer coupling with 50% of chemical fertilizer amount as a recommendation for planting maize also enhanced the yield to compare with the control (only using inorganic fertilizer as a recommendation). The maize yield of applying 20 tons/ha of organic fertilizer was higher than the maize yield of 10 tons/ha of organic fertilizer. Using organic fertilizer produced by fishpond sediment did improve not only the soil quality but also protected the canals and increased household income.</p> Huyen Khon Nguyen Le Thanh Hai Tung Van Tra Nguyen Viet Thang Tran Thi Hieu Thu Hong Anh Nguyen Dong Thi Thu Huyen Nguyen Thi Phuong Thao ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 2020-04-05 2020-04-05 4 1 128 139 10.32508/stdjsee.v4i1.502 title description none g Photocatalytic treatment of volatile organic compounds emitted from mosquito repel incense burning http://stdjsee.scienceandtechnology.com.vn/index.php/stdjsee/article/view/509 <p>Mosquito-repellent incense (MRI) is a widely used product in the household. Although the quality of MRI has been strictly managed, it still has certain health effects in practical use. This study investigated the level of volatile organic compounds (VOCs) in MRI smoke and its removal ability by photocatalysis. An online survey was conducted using Google form to select three typical types of MRI which are the most popular use in Vietnam (i.e., MOSFLY, RAID, and JUMBO VAPE) as well as their use level and condition. These types of MRIs were then burnt in a normal room for 8 h to determine the level of air pollution emission. Results from room test show that the tVOCs concentration emitted from one of the MRIs was as high as 1621 ppb, which was the highest pollution level among the three MRIs tested. This type of MRI was then employed as VOCs pollutant source for testing the treatment ability of a photocatalytic equipment in a closed chamber. &nbsp;The experimental treatment of emitted VOCs by the photocatalytic treatment equipment showed that titania nanotubes (TNTs) modified with metal salt and heat treatment achieved high removal efficiency. It has reached indoor air standards of ≤ 490 ppb after 180 min of treatment with an input concentration of about 1,600 ppb. By changing the conditions of TNTs modification and operation conditions, the highest treatment efficiency was achieved with 2 g of zinc doped TNTs at a Zn/Ti molar ratio of 0.5%, calcined at 500 <sup>o</sup>C, in which the treatment to meet the standard reached the shortest treatment time. The results in this study indicate that burning MRI could cause indoor air pollution that may affect human health and photocatalysis is a potential technology for treating VOCs from indoor MRI burning.</p> Nguyen Nhat Huy Nguyen Thi Bich Ha Dinh Pham Ngoc Huyen Vo Thi Thanh Thuy Hoang Cong Anh Duy Lam Pham Thanh Hien Nguyen Thi Thuy ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 2020-05-24 2020-05-24 4 1 First First 10.32508/stdjsee.v4i1.509 title description none g