Poster OER - Ngành Quản lý tài nguyên môi trường
URI vĩnh viễn cho bộ sưu tập này
Duyệt qua
Gửi gần đây
- 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.
- 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 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 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 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.