Poster OER - Ngành Quản lý tài nguyên môi trường
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Đang duyệt Poster OER - Ngành Quản lý tài nguyên môi trường theo Nhan đề
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- Tài liệuA mini-review on shallow-bed constructed wetlands: a promising innovative green roof(Trường Đại học Nguyễn Tất Thành (Ngành Quản lý tài nguyên môi trường), 2024) Vo, Thi Dieu HienShallow-bed constructed wetland (SCW) has been used as a secondary wastewater treatment technology with low cost, less maintaining and operational requirements and environmental friendliness. Green roof has been considered an effective solution in saving energy, enhancing green space, providing landscape aesthetics, limiting stormwater runoff causing flooding, and purifying air pollutants. Recently, a wetland roof (WR) has been interested as a good integration of these two technologies. To gain an insight understanding of this combination, this review aimed to provide the potential applications of SCW on the roof as a WR. Factors affecting performance, benefits and challenges of SCW were also presented.The literature data showed WR was a promising green technology that needed to be investigated and scaled-up in the future.
- Tài liệuAssessment of nutrients (c, n, p) and heavy metal pollutions in surface canals sediments in ho chi minh city(Trường Đại học Nguyễn Tất Thành (Ngành Quản lý Tài nguyên Môi trường), 2024) Ho, Ngoc Tich; Dang, Thuy Linh; Le Quang Huy; Nguyen, Thanh NhoCanals are considered as primary recipients of dissolved and suspended matters that can be locally accumulated and/or transported far away from emission sources into surface sediments or sludges. Nutrients and heavy metals can pose risks to the environment if they exceed the natural processing capacity of ecosystems. The objectives of this study is assess the status of nutrients (C, N, P) and heavy metals pollution in the surface sediments in canals in Ho Chi Minh City. Sediment samples were taken at four canals, including Tau Hu, Vam Thuat, Nhieu Loc - Thi Nghe and 19/05 at the dry and wet season. The results showed that the contents of nutrients (C, N, P) in the canals were higher in the wet season than in the dry season. However, there is no guideline of the National Technical Regulation (QCVN) regarding the level of nutrient contents in the sediments. Therefore, we only presented the accumulation levels of nutrients in the canals. The results showed that the content Fe > Zn > Cu > Cr > Pb > Ni. The impact and risk assessments showed that the CF of elements was at low, medium and high, Igeo was in the range of no pollution to low and medium pollution. The PLI index > 1 and the RAC risk coefficient within < 30% indicate the pollution and impact of metals on environmental quality. It could be concluded that the studied rivers/canals in Ho Chi Minh City were accumulating large amounts of nutrients and heavy metals that can affect the life of aquatic animals and microorganisms. So, it is necessary to conduct a requirement to prevent and reduce the emission of organic substances and metals into the rivers/canals as well as canal rehabilitation that provide a better environmental condition for the life of aquatic organisms, animals, and humans living close to the canals
- Tài liệuCircular economy for pig farm in Viet Nam(Trường Đại học Nguyễn Tất Thành (Quản lý Tài nguyên Môi trường), 2024) Huynh, Do Anh Thu; Nguyen, Thi Cam Huong; Nguyen, Thi Thanh Xuan; Tra, Van HungPig farming has provided an important source of income for farmers. However, alongside its many benefits, animal husbandry also brings significant problems such as diseases and environmental pollution. Notably, the failure to safely treat livestock waste has serious impacts on both the environment and people. Integrated livestock models have been successful in minimizing pig herd pollution and increasing farmers' incomes. Reusing waste from pig farms to produce fertilizer for crops is essential in reducing environmental pollution. Livestock waste is a recyclable resource for crop fertilization, which can benefit family farms both economically and environmentally. Research and production of fulvic bio-organic fertilizer – amino acids from pig farm emissions – aim to protect the environment and promote sustainable development. An experimental model on the effect of foliar fertilizer on leafy vegetable crops was conducted in vegetable gardens in Hoc Mon district.
- Tài liệuCombination photocatalystic process with h2o2 for enhancement diclofenac removal in wastewater(Trường Đại học Nguyễn Tất Thành (Quản lý Tài nguyên Môi trường), 2024) Pham, Van Thuong; Tra, Van TungDiclofenac (DCF) is a synthetic nonsteroidal anti-inflammatory drug and is widely used for the treatment of inflammatory and painful diseases of rheumatic and non-rheumatic origin. It is a chemical that is difficult to biodegrade and difficult to completely remove by a conventional wastewater treatment plant. A large amount of DCF already in use in Europe (EU) has been detected in many cooperatives in EU countries. In recent years, higher-order oxidation processes have been applied to treat DCF by various processes including photocatalysis such as the TiO2/UV process. Heterocatalytic photocatalysts are increasingly widely applied with high decomposition efficiency as well as good photocatalytic activity, non-toxic, chemically inert and low cost.
- Tài liệuEmerging revolving algae biofilm system for algal biomass production and nutrient recovery from wastewater(Trường Đại học Nguyễn Tất Thành (Ngành Quản lý Tài nguyên Môi trường), 2024) Vo, Thi Dieu HienToward the direction of zero‐carbon emission and green technologies for wastewater treatment, algae-based technologies are considered promising candidates to deal with the current situation of pollution and climate change. Recent developments of algae-based technologies have been introduced in previous studies in which their performances were optimized for wastewater treatment and biomass production. Among these, revolving algae biofilm (RAB) reactors have been proven to have a great potential in high biomass productivity, simple harvesting method, great CO2 transfer rate, high light-use efficiency, heavy metal capture, nutrient removal, and acid mine drainage treatment in previous studies. However, there were few articles detailing RAB performance, which concealed its enormous potential and diminished interest in the model. Hence, this review aims to reveal the major benefit of RAB reactors in simultaneous wastewater treatment and biomass cultivation. However, there is still a lack of research on aspects to upgrade this technology which requires further investigations to improve performance or fulfill the concept of circular economy.
- Tài liệuEvaluation of the contamination of Antibiotic resistant E. coli at a Wastewater treatment plant in Ho Chi Minh(Trường Đại học Nguyễn Tất Thành (Ngành Quản lý Tài nguyên Môi trường), 2024) Huynh, Nhu Hao; Thai, Bao Duy; Le, Thai HoangAntibiotic resistance is an emerging global problem threatening human health as resistant bacteria become difficult or impossible to treat with existing antibacterial drugs. Contamination of antibiotics or substances with antimicrobial activity from human discharge activities including domestic, agricultural, and industrial activities is believed to be the leading cause of antibiotic resistance development. In this study, the indole test and the disk diffusion method are used to confirm E. coli and to measure the multidrug resistance of E. coli in wastewater. As the results, the indole test showed that the highest percentage of positive colonies in S1 about 75-100% and the lowest in S5 about 45-60%. The disk diffusion test showed that E. coli strains resistant to 1 of 5 target antibiotics (Amikacin, Amoxicillin/clavulanic acid, Cefixime, ciprofloxacin, Sulfamethoxazole/Trimethoprim) isolated from wastewater samples gave a total of cross-resistance with other antibiotics is very high. Many strains are resistant to more than 1 antibiotic, especially Amikacin resistant strains have the resistance rate to all 5 antibiotics tested up to 31.25%. The results showed that antibiotic-resistant pollution is present in wastewater in Ho Chi Minh City, and specific action plans need to be taken to minimize the level of pollution as well as the possibility of spreading antibiotic resistance in the environment.
- Tài liệuFloating treatment wetlands to improve the water quality of the hang bang canal, ho chi minh city, vietnam: effect of plant species(Trường Đại học Nguyễn Tất Thành (Ngành Quản lý Tài nguyên Môi Trường), 2024) Vo, Thi Dieu HienFloating treatment wetlands (FTWs) are artifcial platforms that allow aquatic emergent plants to grow in water. Aquatic macrophytes and microorganisms attached to plant roots contribute to the remediation of the contaminated water through physicochemical and biological processes. The pollutant removal treatment performance is affected by various factors, including the plant species. In this study, several plant species, i.e. Canna generalis, Phragmites australis, Pennisetum purpureum, Cyperus alternifolius rottb, Kyllinga brevifolia rottb, and Cyperus ordoratus were investigated for their potential to clean-up water from the Hang Bang canal in Ho Chi Minh City (Vietnam). Canna generalis, Phragmites australis, and Cyperus alternifoliuswere found to be suitable for FTWs with the highest performance compared to that of other plant species investigated. The organic and nitrogen removal rates amounted to 48–70 gCOD/m3.d and 0.7–1.2 gN/m3.d, respectively, whereas the reduction of pathogens was around 1.86–3.00 log. Furthermore, FTW systems bring other benefts such as improving ecosystem functioning and biodiversity, producing value-added products from plant biomass, as well as attracting the attention of communities, thus increasing social acceptance of environmental technology interventions.
- Tài liệuInfluence of nitrogen species and biomass retention time on nutrient removal and biomass productivity in a microalgae-based bioreactor(Trường Đại học Nguyễn Tất Thành (Ngành Quản lý tài nguyên môi trường), 2024) Vo, Thi Dieu HienThis study examined the effects of nitrogen species (NH4+-N/NO3--N ratio) and biomass retention time (BRT) on nutrient uptake and biomass productivity in Chlorella sp. In batch photobioreactors (PBR), microalgae were cultivated with varied nitrogen species ratios (100% NH4+-N, 50% NH4+–N:50% NO3--N, and 100% NO3--N). It was observed that a medium containing 100% NO3––N boosted algae growth, with a maximum biomass concentration of 3188 mg/L. However, the lowest nutrient removal rates were obtained under the 100% NO3--N condition, according to the reverse logistics model. In contrast, the highest removal rates occurred for substrate containing 100% of NH4+-N species based on first-order decay models, although yield biomass was lower (2940 mg/L). The presence of the ammonia nitrogen resulted in the flocculation of the microalgae into large flocs, suggesting that ammonia nitrogen was rapidly consumed to produce flocculation-related metabolic products rather than for biomass production. Using the 100% NH4+-N medium, different BRT values (7, 5, 3, 2 days) were examined under continuous operation using a membrane photobioreactor (MPBR). At 3-day BRT, the maximum biomass productivity, nitrogen, and phosphorous removal rates were 214 ± 4, 63.1 ± 4.1, and 2.1 ± 0.6 mg/L d, respectively. The biomass yield increased as the BRT decreased, leading to an increase in pollutant removal rates. Finally, this study provides some essential information for improving the operating conditions of membrane photobioreactor system under different biomass retention times and various nitrogen sources in the feed.
- Tài liệuStudy on the growth of chlorella vulgaris in different photobioreactors towards applications of shrimp farming wastewater treatment(Trường Đại học Nguyễn Tất Thành (Ngành Quản lý tài nguyên môi trường), 2024) Doan, Thi Thu Hang; Tran, ThanhAlgae is a versatile resource with high value applied in various fields such as food, pharmaceuticals, cosmetics, biofuels, and wastewater treatment. In current wastewater treatment technology, the use of algae in the treatment process is being emphasized. This research aims to cultivate Chlorella Vulgaris algae in a suitable environment to help the algae adapt and grow rapidly during the wastewater treatment application. In two photobiological model systems HRAPs and PMBR combining microalgae Chlorella vulgaris and bacteria in shrimp aquaculture wastewater treatment showed that both model systems have good treatment efficiency. The removal efficiency of COD, nitrate N-NO3-, nitrite N-NO2-, ammonia N-NH4+, total nitrogen and P-PO43- reached 27.4%, 58.7%, -35%, 92.2%, 77% and 93.5, respectively % in HRAPs and 29.7%, 24.5%, 26%, 83.9%, 75% and 93.4% in PMBR model.
- Tài liệuThe study on carbon dioxide treatment in the exhaust gas from the mini engine by microalgae chlorella vulgaris combined tubular photobioreactor(Trường Đại học Nguyễn Tất Thành (Ngành Quản lý tài nguyên môi trường), 2024) Nguyen, Huu Tien; Thanh, TranThe problem of air pollution is growing and the impact is more obvious than ever, in which carbon dioxide - CO2 represents a series of problems that we are facing every day but have not yet been able to solve the problem. effective solutions. Currently, microalgae are known to be organisms capable of photosynthesis and use free CO2, bicarbonate ions, as a source of nutrients to grow. When microalgae grow in good environmental conditions, it will not only bring about efficiency. CO2 treatment results but also to obtain algal biomass for many other applications. This study designed experiments using a tubular algae culture system using Tubular photobioreactor technology to evaluate the ability of microalgae Chlorella vulgaris to grow and absorb emissions. Microalgae were evaluated for their ability to grow under the conditions of natural gas supply (G1 stage), and under the condition of exhaust gas supplied from mini motorcycle engines (G2 and G3 stages) with each stage of about 30 days. Indicators such as pH, DO, N-NO3-, N-NO2-, N-NH4+, Total Nitrogen, TSS biomass, P-PO43-, Alkalinity were assessed with a frequency of 3-5 times/week. Preliminary results show that the Tubular photobioreactor model system has provided a stable growth environment for microalgae in both the natural gas and exhaust gas phases. When through the system, microalgae have reduced pollution by 30-40% of input emissions and algae have also taken advantage of CO2 to grow good biomass.