Navigating fear, shyness, and discomfort during menstruation in Cambodia.

While increased attention has been given to girls' menstrual hygiene management (MHM) experiences in schools as they relate to managerial challenges, research exploring girls' psychosocial experiences during menstruation and their needs in non-school environments remains limited. This study investigates the knowledge, attitudes, and practices regarding menstruation and MHM (M&MHM) among rural Cambodian girls (at least 14 years old, post-menarche; n = 130), mothers (n = 93), fathers (n = 15), teachers (n = 37; 54.1% female), and boys (at least 14 years old; n = 59) in both the home and school environments. Qualitative and quantitative data were collected through structured interviews, focus groups, and latrine surveys in eight secondary schools and villages from two rural provinces, Banteay Meanchey and Kratie. Findings indicated that although 95% of girls felt capable of managing their menses each month, many girls experienced fear, shyness, and discomfort (FSD) during menstruation. Identified M&MHM challenges and FSD in both the home and school environments influenced all participant groups' decision-making, social interactions, and varied based on their knowledge of M&MHM and emphasized the need for comprehensive interventions that reduce the impact of MHM challenges on psychosocial experiences and FSD to promote girls' well-being during menstruation, particularly in income limited settings.

Factors associated with post-treatment E. coli contamination in households practising water treatment: a study of rural Cambodia.

The purpose of this study was to assess factors associated with Escherichia coli (E. coli) contamination in rural households in Cambodia that have adopted household water treatment. The following factors were significantly associated (α < 0.05) with apparent E. coli contamination: cleaning the drinking vessel with untreated water, not drying the cup (with a cloth), accessing treated water by the use of a scoop (ref: using a tap), having more than one untreated water storage container, having an untreated water storage container that appeared dirty on the outside, and cows living within 10 m of the household. This study provides further evidence confirming previous studies reporting an association between inadequate cleanliness of water storage containers and household drinking water contamination, and identifies practical recommendations statistically associated with reduced post-treatment E. coli contamination in the household setting in rural Cambodia.

Impact of surface maintenance on BioSand filter performance and flow.

The BioSand filter (BSF) is a household scaled, intermittently operated, slow sand filter. The BSF requires maintenance to remove trapped sediments. This study evaluated the effects of maintenance on the filter's flow rate and performance. Four concrete BSFs received three styles of maintenance: surface agitation (SA), stirring method (SM), and sand removal (SR). Effluent water was collected from the filter between 0-2 L effluent (0-2 L effluent) and between 15-20 L effluent (15 L+ effluent). After maintenance, effluent at 15 L+ (no pause time) showed a significant decrease in thermotolerant coliform removal rates by 0.66-0.91 log (SA), 0.57-0.67 log (SM) and 0.32-0.83 log (RM) (<0.001). Effluent water at 0-2 L (with pause time) did not significantly decrease in thermotolerant coliform removal rates (>0.17) for any maintenance method. The recovery duration after maintenance for all methods at 0-2 L effluent had a median recovery of <1.2 days. The effluent at 15 L+ had a longer recovery period (at least 3.9, 3.0 and 12.75 days for the SA, SM, and SR method, respectively). The flow rate recovery for SA (76%) and SM (82%) was lower compared to SR (138%).

Ultraviolet absorption properties of suspended particulate matter in untreated surface waters.

Previous research has shown that wastewater disinfection using UV light can be impaired by attenuation of the UV light as it passes through particles to reach embedded and protected microorganisms. This study determined that the UV absorption (at 254 nm) of particles present in 10 untreated surface waters was similar to the absorption of wastewater particles. As such, it provides evidence that UV disinfection of surface waters during drinking water treatment may be impaired by the same mechanism if particles are present. The study also demonstrated that among the 10 untreated surface waters examined, there was no correlation between the UV absorption (254 nm) of the solid particulate material, total organic carbon, total suspended solids, turbidity, or UV absorbance (254) of the bulk water.

Inactivation of indigenous coliform bacteria in unfiltered surface water by ultraviolet light.

This study examined the potential for naturally occurring particles to protect indigenous coliform from ultraviolet (UV) disinfection in four surface waters. Tailing in the UV dose-response curve of the bacteria was observed in 3 of the 4 water samples after 1.3-2.6-log of log-linear inactivation, implying particle-related protection. The impact of particles was confirmed by comparing coliform UV inactivation data for parallel filtered (11 microm pore-size nylon filters) and unfiltered surface water. In samples from the Grand River (UVT: 65%/cm; 5.4 nephelometric turbidity units (NTU)) and the Rideau Canal (UVT: 60%/cm; 0.84 NTU), a limit of approximately 2.5 log inactivation was achieved in the unfiltered samples for a UV dose of 20 mJ/cm2 while both the filtered samples exhibited >3.4-log inactivation of indigenous coliform bacteria. The results suggest that particles as small as 11 microm, naturally found in surface water with low turbidity (<3NTU), are able to harbor indigenous coliform bacteria and offer protection from low-pressure UV light.