Dang Thi Thanh Loc

Hue University · Hue University of Sciences - Department of Environmental Science

Providing effective and sustainable water disinfection methods, without harmful by-products, is essential to protect public health and safety. It is hypothesized that the application of liquid-thin-film (LTF) technology can enhance the bactericidal activity of both ultraviolet (UV) irradiation and ozone (O3) treatments. Therefore, this study aimed...

Cyanobacteria are a group of photoautotrophic prokaryotes which have the ability to biosynthesize plant growth regulators, especially Indole-3-acetic acid (IAA), and have not been focused on research yet in Vietnam. In this study, Arthrospira massartii (ARH strain) - a planktonic cyanobacterial strain isolated from a freshwater lake in Hue City, Th...

Disease outbreaks attributed to monsoon flood-induced pathogen exposure are frequently reported, especially in developing cities with poor sanitation. Contamination levels have been monitored in past studies, yet the sources, routes, and extents of contamination are not always clear. We evaluated pollution from municipal wastewater (MWW) discharge...

Công nghệ khử trùng nước không tạo ra các sản phẩm phụ độc hại ngày càng thu hút nhiều quan tâm nghiên cứu trong những năm gần đây. Nghiên cứu này trình bày kết quả khử trùng Escherichia coli trong nước bằng tia UV kết hợp với thiết bị tạo màng chất lỏng (LFFA). Sự nhạy cảm của vi khuẩn với sự khử trùng bằng UV hoặc UV/LFFA được xác định tại các đi...

This study presents results for the use of UV radiation and a liquid-film-forming device (LFFD) for disinfection of water. Escherichia coli was used as a model microorganism for examining the bactericidal performance of UV. Bacterial inactivation was conducted in a LFFD with various condition of UV dosages, air flow rates, and initial bacterial con...

This study presents results for the use of UV radiation and a liquid-film-forming device (LFFD) for disinfection of water. Escherichia coli was used as a model microorganism for examining the bactericidal performance of UV. Bacterial inactivation was conducted in a disinfection apparatus with various conditions of UV dosages, air flow rates, and in...

With tap water as a physical solvent to absorb CO2 from different concentrations of mixed gases (containing CO2 and N2), an apparatus outfitted with a water-film generator was used to enhance the CO2 dissolution rate as well as the contact between the liquid and gas phases. The operational pressure in the absorption tank, induced gas pressure, init...

Heat and humic acid modified sludge (MS) from drinking water treatment plant (DWTP) is used as an adsorbent for removal of phosphate (P) from aqueous solution. The MS was characterized by XRD and SEM observation. The effects of pH, adsorbent dosage, initial P concentration, and exposure time on the P removal were studied. Under identical treatment...

This paper presents the results from using a physical absorption process to absorb gaseous CO2 mixed with N2 using water by producing tiny bubbles via a liquid-film-forming device (LFFD) that improves the solubility of CO2 in water. The influence of various parameters—pressure, initial CO2 concentration, gas-to-liquid ratios, and temperature—on the...

This study investigated the effect of combined treatments using pressurized carbon dioxide (PCD) and sodium hypochlorite (NaOCl) on the inactivation of Enterococcus sp. in artificial seawater. Bacterial inactivation was conducted in a liquid-film-forming apparatus with various pressure conditions, CO2 supply rates, and chlorine dosages. Combined PC...

Interest is growing in a disinfection technique for water treatment without disinfection byproducts. This study presents the result of using a liquid-film-forming apparatus at less than 1.0 MPa for disinfection of seawater. The sensitivity of Enterococcus sp. (ATCC 202155) to the pressurized carbon dioxide (CO2) was examined under various condition...

Ship ballast water should be disinfected before being discharged into the ocean to avoid the dispersal of non-native species into the marine environment. This study presents the results of using pressurized carbon dioxide (CO2) at less than 1.0 MPa for inactivating Escherichia coli and Enterococcus sp. in artificial seawater (3.4% salinity). The ba...

Recently emerging disadvantages in conventional disinfection have heightened the need for finding a new solution. Developments in the use of high pressure carbon dioxide for food preservation and sterilization have led to a renewed interest in its applicability in wastewater treatment and water disinfection. Pressurized CO2 is one of the most inves...

Septic tank is used commonly at household in Hue as well as other cities in Vietnam. During its operation, septic tank releases greenhouse gases (GHGs) into the environment from anaerobic degradation of organic waste. Collection and treatment of septage, such as co-landfill with municipal solid waste in Hue, also creates GHGs. This study tried to e...

A modified column flotation of using tiny microbubbles ozonation (MB, diameter range: 1–16 μm, D32 = 6.59 μm) enhanced by coarse bubbles (CB, diameter range: 0.5–5 mm) was designed for the treatment of fine oil-in-water emulsions (EO, d < 16 μm, D32 = 6.3 μm) and humic acid (HA) mixture (EO/HA, d < 16 μm, D32 = 5.8 μm). Samples of EO/HA showed much...

This paper gives an overview of existing status of sanitation conditions inside Hue Citadel, based on the secondary information collected and data from survey and measurement. Study results show that the wastewater collection rate of urban sewer sytem was quite low (70% of wastewater generated) and the ratio of households connected to the system wa...