Poster OER - Ngành Quản lý tài nguyên môi trường
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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 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 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.