
Ngan Nguyen Vo ChauCan Tho University · Department of Water Resources
Ngan Nguyen Vo Chau
Doctor of Engineering
Teaching + Research
About
97
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Introduction
Evaluating surface water pollution / Assessing the load–carrying capacity of receiving surface water sources / Wastewater treatment technology
Skills and Expertise
Publications
Publications (97)
A domestic biogas digester (BD) is a household-sized system that produces biogas from organic waste under anaerobic conditions. By substituting conventional cooking fuel with biogas, greenhouse gas (GHG) emissions can be reduced. In addition, improved livestock manure management from use of the BD system can lead to further GHG emission reductions....
The use of small-scale biogas digesters among farmers and households in rural areas of developing countries is a well-known technology. The potential for biogas in these areas is probably much larger than presently exploited and therefore more knowledge on factors that may further the use of biogas is needed. The present study draws on data from tw...
The Mekong Delta region is increasingly challenged by a declining and irregular water budget over recent decades. This trend is evidenced by altered precipitation patterns, characterized by drier wet seasons and wetter dry seasons, along with diminished upstream flow and a shifting wet season flood pulse. This study presents a comprehensive analysi...
This study investigates the biomass of Melaleuca cajuputi tree at the Tra Su Melaleuca Forest Landscape Protection Area, located in An Giang province, Vietnam. Tra Su Forest is a managed territory under the An Giang Forest Protection Department. Established as a landscape protection area since 2005, the area has been designated for sustainable deve...
In the Mekong Basin, rice plants have low yields because of degraded soils, fresh water is becoming scarce, and rice cultivation consumes a lot of water. Beijing-directed rules to govern the river and its plan to build cascade dams upstream have weakened the Mekong River. The Mekong River Commission was established in 1957, but for over 50 years, t...
This study examines the changing rainfall patterns in the Vietnamese Mekong Delta (VMD) utilizing observational data spanning from 1978 to 2022. We employ the Mann-Kendall test, the sequential Mann-Kendall test, and innovative trend analysis to investigate trends in annual, wet, and dry season rainfall, as well as daily rainfall events. Our results...
The research was conducted on groundwater exploitation and usage in Ward 2, Vinh Chau Town, Soc Trang Province. A total of 405 households were interviewed about end-use water status. Groundwater samples from 9 wells were monitored once for water quality status. The results of the study indicated that there was a total of 520 wells installed at 405...
Ô nhiễm phát sinh từ nước thải giàu dưỡng chất của ngành thủy sản nói chung, và công nghiệp chế biến thủy sản nói riêng tại Đồng bằng Sông Cửu Long đã và đang gia tăng áp lực cho môi trường trong bối cảnh Việt Nam đang thúc đẩy phát triển xuất khẩu thủy sản. Nghiên cứu thử nghiệm kết hợp mô hình cột AS và bể AAO quy mô phòng thí nghiệm để xử lý nướ...
Background
Aquatic plants play a crucial role in nature-based wastewater treatment and provide a promising substrate for renewable energy production using anaerobic digestion (AD) technology. This study aimed to examine the contaminant removal from AD effluent by water lettuce (WL) and produce biogas from WL biomass co-digested with pig dung (PD) i...
Nghiên cứu nhằm khảo sát mức nhiệt độ phù hợp để xử lý yếm khí nước thải chế biến thủy sản. Ba nghiệm thức ủ yếm khí bằng bình ủ tự chế 21 L ở ba mức nhiệt độ 30°C, 35°C và 40°C được bố trí trong điều kiện phòng thí nghiệm. Sau 15 ngày ủ, các nghiệm thức có hiệu suất xử lý khá cao ở các thông số theo dõi: TSS từ 87,6 đến 89,7%, BOD5 từ 61,7 đến 69,...
Nghiên cứu được tiến hành trên mô hình bể thâm canh tảo Spirulina sp. với mục đích xác định khả năng sử dụng nước thải sinh hoạt để sản xuất sinh khối tảo, đồng thời đánh giá hiệu quả xử lý nước thải sinh hoạt. Các thí nghiệm được tiến hành ở quy mô phòng thí nghiệm trên hai mô hình bể thâm canh tảo có bổ sung HCO3- và không bổ sung HCO3-. Kết quả...
Nghiên cứu nhằm đánh giá mối tương quan giữa chất lượng nguồn nước và sự phân bố động vật đáy ở kênh E, thành phố Cần Thơ. Mẫu động vật đáy và mẫu nước được thu thập tại ba vị trí trên kênh vào tháng 12/2018 và tháng 4/2019. Phân tích định lượng và định tính được thực hiện cho thấy thành phần động vật đáy có 8 loài thuộc 4 họ và 4 lớp, mật độ và si...
Nghiên cứu được thực hiện nhằm tìm ra các thông số vận hành của bể keo tụ điện hóa để tiền xử lý nước thải nhà máy in. Các thí nghiệm đã ghi nhận các thông số vận hành tối ưu gồm: góc nghiêng điện cực 45o, khoảng cách điện cực 1 cm, mật độ dòng điện 240 A/m2, hiệu điện thế 12 V, thời gian lưu nước 30 phút. Nước thải thí nghiệm có độ màu 1.363 PCU...
This study addressed the issue of recycling waste plastic bottles as recycled plastic fiber (RPF) into sustainable waste plastic fiber-reinforced concrete (WPFRC). Thus, the effects of different RPF lengths (30, 50, and 70 mm), widths (2, 4, and 6 mm), and contents (0.3, 0.45, and 0.6 vol%) on the performance of WPFRC were systematically evaluated...
Cassia fistula seed-derived coagulant has been reported to exhibit high coagulating–flocculating activity, environmental friendliness, and cost-effectiveness for the wastewater treatment, especially of textile wastewater. For heavy metal removal, however, research focusing on evaluating the feasibility of this material is still limited. Therefore,...
Nghiên cứu nhằm đánh giá hiệu quả xử lý nước thải sinh hoạt bể phản ứng giá thể di động (Moving bed biofilm reactor - MBBR) kết hợp với cột màng lọc tự chế ở những thời gian lưu nước khác nhau. Bể MBBR có thể tích 45,54 L chứa 40% giá thể K3, và cột lọc màng tự chế quy mô phòng thí nghiệm được sử dụng trong nghiên cứu. Kết quả cho thấy ở tải nạp và...
Nghiên cứu nhằm đánh giá thành phần phiêu sinh thực vật tại Khu bảo vệ cảnh quan rừng tràm Trà Sư theo mùa. Mẫu phiêu sinh thực vật được xác định bằng phương pháp định tính và định lượng tại 20 vị trí đại diện cho các vùng sinh thái trong rừng. Đợt khảo sát mùa khô ghi nhận 119 loài thuộc 6 ngành, trong đó ngành tảo lục chiếm tỉ lệ cao nhất (34%),...
Background The evaluation of nutrient variability plays a crucial role in accessing soil potentials and practical intervention responses in rice production systems. Synthetic fertilizer applications and cultivation practices are considered key factors affecting nutrient dynamics and availability. Here, we assessed the nutrient dynamics in surface,...
Nghiên cứu sử dụng mô hình đất ngập nước nhân tạo có dòng chảy ngầm theo phương ngang có trồng cây bách thủy tiên (Echinodorus cordifolius L.) để xác định khả năng xử lý nước thải sinh hoạt theo thời gian lưu nước khác nhau. Kết quả cho thấy ở thời gian lưu nước 7 ngày, nước thải sau xử lý có các thông số pH, SS, BOD5, N-NH4+, N-NO3-, P-PO43- đạt l...
The dike surrounding the coast of the Vietnamese Mekong Delta (VMD) helps prevent saltwater intrusion and coastal erosion. In order to preserve these dikes, an area of protective forest is planted outside them, helping to maintain and strengthen them. Therefore, monitoring the change in the area of planted forest outside the dike will help to asses...
This study aimed to assess the current state of the shoreline and the effects of erosion on the shoreline in Vinh Chau Town, Soc Trang Province, Vietnam. Satellite image overlays were used to quantify the variation in the shoreline as a result of erosion caused by changes in wave action. In addition, the wave measurements were implemented at three...
O Tuk Sa in An Giang province. The results suggest that the usable storage capacity of the O Ta Soc reservoir will increase to 650,000 m 3 to meet water supply demands under all climate change scenarios and the medium-term, moderate drought conditions. The use-able storage capacity of the O Tuk Sa reservoir will also be increased to 880,000 m 3 and...
This paper examines the impact of the dike systems on river flows in the Vietnamese Mekong Delta (VMD). The study combined a hydrological change index method and the Mann–Kendall test to assess the temporal dynamics of both discharge and water levels along the main rivers of the VMD. Results highlight that the system of rivers and canals helps faci...
The water balance in six selected crops (mung beans, tomatoes, maize, cassava, yam, and sweet potatoes) was determined at the field block scale in the Vietnamese Mekong Delta for two agricultural growing areas. A novel approach for the calculation of water balance was employed, which combined the reference crop evapotranspiration (ETo), derived fro...
The water balance in six selected crops (mung beans, tomatoes, maize, cassava, yam, and sweet potatoes) was determined at the field block scale in the Vietnamese Mekong Delta for two agricultural growing areas. A novel approach for the calculation of water balance was employed, which combined the reference crop evapotranspiration (ETo), derived fro...
Environmental pollution is becoming serious worldwide and remains a big challenge for human beings in this century. Many countries and organizations are seeking solutions to this problem and have set objectives in achieving digital transformation and Sustainable Development Goals by various means. Artificial intelligence is machine intelligence fou...
This study evaluated biogas production potentials from local biomass feedstocks comprising of rice straw (RS), steamed lemongrass (SL), bagasse (BA) and desiccated coconut (DC) on super�intensive shrimp sludge (SS) anaerobic digestion. A series of batch anaerobic digestion experiments was conducted at an organic loading rate of 50 g-VS L-1 and a C/...
An assessment of varying density, species composition and dynamics of phytoplankton
in a combined rice-shrimp culture was carried out in My Xuyen district, Soc Trang province in the Vietnamese Mekong delta. Water was sampled six times at six separate locations within the culture system, on days 1, 20, 34, 57, 68, and day 81 of the rice-shrimp crop...
This study is aimed at testing a new method to improve fishpond water quality in the acid sulfate soil areas by using biogas slurry (BS). Two experiments were implemented on-site at the fishpond to test for quantity of biogas slurry applied and fish growing status. In the first experiment, treatment of 75% BS had water pH increased from 3.3 to 6.5...
In 2015, the Vietnam’s Renewable Energy Development Strategy up to 2020 with an outlook to 2050 was approved. Renewable energy sources were developing to ensure energy security and addressing the growing power demand of the country. Increasing renewable energy sources such as biomass, solar, wind and small hydro is the way to shift Vietnam to a sus...
Co-digestion between biomass and livestock waste increases methane production by providing an optimal C/N ratio. Also, bio-pretreatment has received more attention due to its effectiveness in biomass-derived material hydrolysis into biodegradable carbohydrates. Rice straw (RS) is abundant in the Vietnamese Mekong Delta (VMD), which potentially enha...
Background The evaluation of nutrient variability plays a crucial role in accessing soil potentials and practical intervention responses in rice production systems. Synthetic fertilizer applications and cultivation practices are considered key factors affecting nutrient dynamics and availability. Here, we assessed the nutrient dynamics in surface,...
Study on using of ferromagnetic nano particles (CoFe 2 O 4) and ferromagnetic nano-OH materials evaluated the efficiency of plating wastewater treatment with initial parameters: pH = 5; Ni 2+ = 25 mg/L, Cu 2+ = 25 mg/L, Zn 2+ = 25 mg/L. Research results showed that Ni 2+ , Cu 2+ , Zn 2+ ions removal efficiency of Nano material are respectively 62,5...
Researching on Methyllen Blue dye treatment ability with Nano material (CoFe 2 O 4 synthesized by co-precipitation method) combined with Biogum (extracted from Osaka Seeds (Cassia Fistula Linn). Research results show that with Biogum base material fully covered by magnetic nanoparticles of size 70-95 nm (SEM) and the presence of several specific fu...
Plant-derived coagulants have exhibited a good potential in wastewater treatment due to their “green” characteristics, high coagulating-flocculating activity, cost-effectiveness, and biodegradability. Nevertheless, research studies have focused mainly on bench-scale experiments; pilot-scale and full-scale simulations are still limited. Herein, we f...
ABSTRACT The study was carried out to evaluate the AAO treatment process to eliminate the organic matter, nitrogen and phosphorus to the optimum values, while surveying some suitable operating parameters for biogas effluent treatment to reach the permitted discharge standards. The study was conducted on the laboratory scale AAO model of 42 L. When...
Current practices in rice production leave a huge amount of wet straw on the field, which cannot be used as feed or for food production. Compost production is one way of effectively utilizing rice straw. Spent rice straw from mushroom production is also used as compost but this has low nutrient value and is poorly decomposed when using it as a soil...
Anaerobic digestion (AD) is a process of degradation of organic matter by microorganisms in an oxygen-free environment, which produces biogas, a vital renewable energy source. Using solely an organic source, such as monosubstrates, it is difficult to optimize the AD process due to nutrient imbalance, lack of appropriate microbial communities, and t...
ABSTRACT
The study is aimed to put the 5-stage Bardenpho tank in practice on treating aquatic
products processing wastewater through survey its operation parameters. The tests
was carried out at the lab-scale of 5-stage Bardenpho model connected to the USBF
tank. The study results showed that when operating Bardenpho tank with loading rate
/m3,
of...
Nghiên cứu đã đánh giá hiệu quả xử lí nước thải xi mạ nhân tạo với các thông số khảo sát ban đầu: pH = 5; Cu2+= 25 (mg/1L), sử dụng vật liệu keo tụ sinh học Biogum và vật liệu keo tụ hóa học PAC. Kết quả khảo sát trên đối tượng nước thải xi mạ Cu2+ cho thấy hiệu suất cải thiện của Biogum ở liều lượng tối ưu đạt 83,11% trong khi PAC đạt chỉ 68,93%....
Nghiên cứu thực hiện trên khu đất ngập nước trồng Bồn bồn và Ngải hoa xử lí nước thải sinh hoạt. Ở thời gian lưu nước (HRT) 5 ngày, nước thải sau khi xử lí đạt quy chuẩn xả thải đối với các chỉ tiêu SS, BOD5, N-NO3-, P-PO43-, DO và TKN; riêng N-NH4+ và tổng Coliforms đạt QCVN 14:2008/BTNMT cột B. Ở HRT 4 ngày chỉ có chỉ tiêu N-NH4+ vượt ngưỡng xả t...
In this study, the steady-state groundwater model in the study area, Can Tho city, a capital of Mekong Delta, was developed. To construct the numerical groundwater model for the Can Tho city, the concept and model boundary were set by hydrological data (model layers), digital elevation map (drainage and surface) and Mekong Delta region groundwater...
This study evaluated the suitability of groundwater quality for domestic use and irrigation in Vinh Chau District, Soc Trang Province, Vietnam. Water samples from 30 domestic-use and 10 irrigation groundwater wells were collected and their physicochemical parameters were analyzed. Results indicated that, based on WHO and Vietnamese standards, the g...
Anaerobic digestion technology (biogas) has been used to treat husbandry wastes in the Mekong Delta of Vietnam for more than 30 years. However, biogas applications are limited. One major barrier is lack of input material for biogas digesters, because husbandry is normally conducted at the household scale. In contrast, rice straw (RS) is available i...
The study was aimed to treat medical wastewater reach the national
discharge standard. In this study, the medical wastewater first treated by
the Fenton/ozone reactor, then continuously treated by the submerged
aerated fixed bed bioreactor (SAFB); reactors were tested at the lab-scale
conditions. The treatment efficiency of medical wastewater by th...
According to experts and managers in science and technology (S&T) sector, technology transfer (TT) activities in Vietnam have not achieved the desired results that were reflected by the amount of limited research results applying in production, number of TT contracts were few, and not many businesses considered investing in research and TT activiti...
SURVEY AND TREATMENT GROUNDWATER BY PLASMA TECHNOLOGY The study aim to evaluate the groundwater treatment efficiency on iron, arsenic, E. Coli applying plasma technology. The plasma system was design to operate in lab scale conditions with artificial groundwater. The results showed that the flow rate of plasma column and the storing time of treated...
Due to fast growth of industrial sector, the volume of sludge from wastewater treatment systems increases, and this becomes a big problem to the environment. The cost for treatment of sludge is high and requires typical landfill for disposal. This study suggested recovering energy from the sludge of wastewater treatment plants through an anaerobic...
This experiment was carried out in 60 liters semi-continuous reactors using rice straw (RS) and water hyacinth (WH) as the substrate. All of the treatments were set up by completely random design; each treatment was done in triplicate with the loading rate at the level of 1 gVS.L-1.d-1. The results showed that mixing during incubation period enhanc...
This study was conducted in two lab-scaled high rate
algae cultivation ponds operating at hydraulic retention
time (HRT) of 1.5 days and 1.8 days to cultivate
Chlorella sp. in combination with continuous ponds
raising Moina sp. to evaluate the effectiveness of
biomass production. The study result showed that the
flow rate of the algae pond having H...
The study aimed to diversify the treatment technology of catfish processing wastewater. The experiments were implemented on lab-scale package cage rotating biological contactors with the first stage in anaerobic condition and the second stage in the aerobic condition, using PVC flexible conduit medium. The selected hydraulic retention time of anaer...
This study was conducted on two lab-scale high rate Spirulina sp. algae
culture pond which operated at hydraulic retention time (HRT) of 3 days and 5
days, to evaluate the effectiveness of reducing organic matter, reusing
nutrients in biogas effluent and producing algal biomass. Biogas effluent was
settled for 30 minutes, then diluted with tap wate...
Title: Study on operation parameters of combined process on coagulation-flocculation and Fenton to treat printing factory wastewater Từ khóa: Keo tụ-tạo bông, nước thải nhà máy in, phản ứng Fenton, phản ứng Fenton / ozone ABSTRACT This research was carried out to determine the appropriate operating parameters of the coagulation-flocculation process...
Title: Study on treatment of sugar-cane processing wastewater by the aerobic moving bed biofilm reactor with different hydraulic retention time Từ khóa: Bể MBBR hiếu khí, nước thải sản xuất mía đường, thời gian lưu nước ABSTRACT This study aimed to define the optimum hydraulic retention time to treatsugar-cane processing wastewater on the aerobicmo...
This study applied one chemical coagulant, PAC, and three biological coagulant aids include Moringa seed gum, Cassia seed gums and polymer. The results indicated that the best dose of PAC be used as coagulants was 480 mg/L. Using polymer as aids with PAC could remove 66.70 % of COD, 66.86 % of SS, 39.01 % of color from studied wastewater. Using Mor...
The study on “Biogas production from pig-raising wastewater by anaerobic package
cage rotating biological contactor with rice-straw medium” was implemented to assess
the possibility of using rice straw as medium to the anaerobic package cage rotating
biological contactor for livestock wastewater treatment as well as the substrate for
biogas product...
ABSTRACT
The study of “Evaluation of cat-fish processing wastewater treatment
efficiency of aerobic package cage biological contactor” was carried out to
determine the efficiency of cat-fish processing wastewater treatment
according to aerobic package cage biological contactor with a PVC flexibleconduit
medium. A lab-scale aerobic package cage biol...
This study was conducted to evaluate the efficiency of domestic wastewater treatment by high rate algae pond culture Spirulina sp. with additional light illumination at night. The results show that at the same hydraulic retention time of 3 days, correspondence to hydraulic loading rate of 0.1 m3/m2*day-1, organic loading rate of 68.6 kg BOD5/ha*day...
This study implemented two lab-scale submerged biological aerated filters
(SBAF) which were operated in co-current and counter-current of air and
wastewater modes. The results showed that the SBAF is suitable to use for
treating catfish processing wastewater, and the counter-current SBAF
having higher pollutants removal efficiency than that of the...
This study was performed based on anaerobic batch experiment in 60 days with
biological pre-treatment water hyacinth methods such as (i) biogas digester effluent,
(ii) dark anoxic sediment, (iii) ditch water, and (iv) tap water and 100% pig manure.
The results indicated that pre-treated water hyacinth by dark anoxic sediment could
speed up biogas p...
The study on “Evaluation of treatment efficiency of domestic wastewater by aquatic plants” was processed on a lab-scale artificial wetland system. Three aquatic plant variaties were chosen for this study, including: water cabbage, water hyacinth, and umbrella papyrus. The results showed that all three plant variaties were of high treatment efficien...
This study was to evaluate technical feasibility of the electro-flotation
method as a primary treatment unit in wastewater treatment system at
cat-fish processing enterprises. Four experiments were carried out to
select suitable operational parameters for electro-flotation unit. The
results at the lab-scale model operated at 45o inclined angle elec...