https://dspace.ctu.edu.vn/jspui/handle/123456789/65379 2026-04-23T14:58:13Z https://dspace.ctu.edu.vn/jspui/handle/123456789/71752 Title: Sustainability assessment of community-based water resource management of irrigation systems for agriculture Authors: Huynh, Thi Lan Huong; Pham, Ngoc Anh 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 Ciang 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. 2021-01-01T00:00:00Z https://dspace.ctu.edu.vn/jspui/handle/123456789/71751 Title: Removal of greenhouse gas in biofilter using organic and inorganic media Authors: Nguyen, Thanh Tung; Chiemchaisri, Wilai; Chiemchaisri, Chart; Sanguanpak, Samunya Abstract: A biofilter using organic (compost) and inorganic (pumice, porous silica pellet or poremat) media was applied to the removal of methane (CH₄ and nitrous oxide (N₂O) to minimize the impact of off-gasses from municipal solid waste disposal global. The objective was to determine the appropriate biofilter media for CH₄ oxidation and N₂O conversion. The off gas (59.6% CH4, 1.0% N₂O) was fed simultaneously with air (1:3 ratio) into the biofilter. CH₄ oxidation and N₂O conversion rates were observed over a 101-day period through the analysis of gas concentration along the biofilter’s depth using gas chromatography. Higher CH₄ oxidation in the biofilters containing organic and inorganic media was achieved, especially for the compost-poremat biofilter with 70.1 g CH₄/m³/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 CH₄ oxidation, especially during the initial period. N₂O 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. 2021-01-01T00:00:00Z https://dspace.ctu.edu.vn/jspui/handle/123456789/71750 Title: Fluctuations in agriculture and sediment in the Mekong delta of Vietnam due to increased upstream water use Authors: Bui, Viet Hung; Nguyen, Ngoc Diep Abstract: The Mekong delta (MD) of Vietnam rests at the end of the lower Mekong basin (LMB) where it is met with serious adverse effects from all upstream activities with severe consequences like landslides and complicated subsidence phenomena. Researchers agree that the main reason for these consequences are the lack of sediment deposited in MD due to the absence of floods and upstream hydropower development. To better understand the causes of the above phenomena, research on the transboundary impact between Vietnam and Cambodia in the MD was carried out [1]. This article develops more reliable scientific evidence of the impacts of upstream water use on the economic, social, and environmental factors of its four national members. It also scientifically demonstrates the transboundary impacts of upstream hydropower and irrigation developments in LMB such as the decline of sediment and the extreme decline of the quantity/yield from natural fisheries under all development scenarios. 2021-01-01T00:00:00Z https://dspace.ctu.edu.vn/jspui/handle/123456789/71749 Title: Co-digestion of domestic wastewater and organic fraction of food waste using anaerobic membrane bioreactor: a pilot scale study Authors: Bui, Hong Ha; Nguyen, Lan Huong; Nguyen, Thanh Tri; Nguyen, Phuoc Dan Abstract: In this study, a co-digestion pilot scale study of a mixture of domestic wastewater and the organic fraction of food waste using an anaerobic membrane bioreactor was developed. The results show that the removal efficiencies of the chemical oxygen demand (COD) and total suspended solids (TSS) were high and reached more than 90%. However, the removal of nitrogen and phosphate was not remarkable. The daily biogas yield reached 2.12 m³/d. The obtained biogas per COD removed was 0.22 m³/kg COD removed. The average generated methane yield was 1.33 m³/d, which is equivalent to 0.14 m³/kg COD removed . A high efficiency of organic compound removal combined with a large amount of retained nutrients and high biogas yield suggests the results of this pilot scale study can be practically applied to the recovery of nutrients for agricultural use along with biogas for cooking. These benefits remarkably reduce environmental pollution, especially for decentralized residential areas and independent-stationed military units located far from concentrated wastewater treatment plants. 2021-01-01T00:00:00Z