Hygiene and environmental health advances最新文献

Coprophobia characterizes faecal sludge (FS) as an unpleasing raw or partially digested faecal waste with no recycling value. However, this so-called waste is claimed to have tremendous recycling values after being pyrolyzed. This study hypothesized that char briquettes made from FS might have the potential of replacing charcoal consumption in Dar es Salaam, Tanzania. Quantitative methods were used to examine the proximate, emissions and environmental benefits of faecal sludge char briquettes in comparison to wood charcoal from Dalbergia melanoxylon (locally known as Mpingo). Results revealed that FS collected during the dry season exhibited a higher total solids content (26%) compared to that collected during the rainy season (20%). This difference was statistically significant (p = 6.12405E-14 at α=0.05). Dewatering and further drying the FS to a minimum of 90% total solids yielded an energy value of 11-12 MJ/kg, which was lower than that of uncarbonized wood (firewood) at 19 MJ/kg. Production of FS char briquettes bonded by paper waste has a lower energy value (13 MJ/kg) than that bonded by cassava starch (14.6 MJ/kg). The average energy value of FS char briquettes is almost half that of wood charcoal (26 MJ/kg), meaning that the replacement of 1 kg of charcoal consumption would require 2 kg of FS char briquettes is required. Nevertheless, due to an ineffective collection of FS to be used in the production of char briquettes, only 8% of charcoal consumption in the city can be replaced. It is recommended to use the produced briquettes in open kitchens with ample oxygen circulation, as they emit carbon monoxide levels exceeding the allowable limits set by the Tanzania Bureau of Standards.

The influence of different environmental factors on the infectivity of H1N1 influenza virus was measured. We found less than 1-log reduction when viruses were exposed to NaCl solutions up to 5 M or solutions with pH = 4 through 11 for one hour. The infectivity of the virus was sensitive to the solution temperature. A log reduction ranging from 2 to more than 6 was observed starting at 50 °C and spanning just 3 or 5 for 10- or 30 min exposures, respectively. Drying the virus in media on aluminum or polymer coupons for 48 h resulted in a log reduction of 4 when kept at room temperature, but less than one when kept at 4 °C or -20 °C. Log reduction greater than 6 occurred at room temperature after 3 days, but only 1-log reduction occurred at 4 and -20 °C after 6 days. Drying on different coinage achieved similar results, except for pennies, where more than 6-log reduction was observed after 24 h. HOCl was used to fog the aluminum and polymer surfaces, placed vertically, for 5 and 7.5 min to achieve a log reduction of 4 and for 6.5 respectively. Storage of opened solution containers for 9 months at ambient resulted in a decrease in chlorine concentration from 550 ppm to 240 ppm. Fogging with the old solution was still able to achieve a log reduction of 6.5 after 7.5 min fogging. The study indicates that exposure to common environmental conditions such as a wide pH range, high salinity, and low temperatures has only a minor effect on infectivity. which can persist for more than 5 days when dried on commonly encountered surfaces, allowing accumulation of infectious viral titre. Fogging with HOCl is an effective method of delivering disinfectants to large areas, achieving complete reduction of the viral titer on both horizontal and vertical surfaces.

While human exposure to metals may play a role in the pathogenesis of anemia, consumption of balanced diets may boost blood hemoglobin (Hb) levels in humans. Although informal electronic waste (e-waste) recycling processes have recently drawn attention as an important source of pollution, there is almost no empirical evidence on the relationship between diet, metals exposure and anemia among e-waste recyclers. Therefore, we evaluated possible ameliorating effects of diet on metal exposure related anemia, as measured by Hb levels of e-waste recyclers and a reference population in Ghana.

This repeated measure study used data collected from e-waste recyclers (n=142) and a reference population (n=65) between March 2017 and October 2018. Stored whole blood samples were analyzed for the following metals; Cd, Pb, Rb, Tb, Tl, and Eu. Next, Hb levels were analysed using the URIT-810® semiautomatic biochemistry analyzer. Furthermore, a 48-hour dietary recall questionnaire was administered to assess dietary intake parameters such as protein, folate, carbohydrates, Fe, Ca, Mg, Se, Zn, and Cu. Ordinary regression models were used to estimate joint effects of metals and nutrients on Hb levels.

At baseline, the mean Hb was lower among recyclers (12.99 ± 3.17 g/dL) than the reference group (13.02±2.37 g/dL). Blood Pb, Cd, Rb, Eu and Tb were associated with significant decreases in Hb levels of e-waste recyclers. Dietary intake of proteins and Fe was associated with concomitant increase in Hb levels of both groups as well as when analysis was restricted to recyclers. Despite the high exposure of e-waste recyclers to a myriad of metals, consumption of Fe-rich diets appears to ameliorate anemia and improved Hb levels (β=0.229; 95% CI: 0.013, 0.445; p=0.04). Therefore, the consumption of Fe and protein-rich foods may boost blood Hb levels in e-waste recyclers, even though exposure to high levels of metals is a predictor of anemia among this worker-group.

The flame retardant industrial park is a significant source of atmospheric volatile organic compound (VOC) emissions. A flame retardant factory is generally associated with abundant salt pans, which facilitate brine raw materials for flame retardant production. However, the concentrations and compositions of these VOCs from the factories and the surrounding salt pans are still unclear. Therefore, this study characterized the VOCs from various production areas in a flame retardants factory and its surrounding salt pans. We investigated five VOC types: alkanes, aromatic hydrocarbons (AHs), halogenated hydrocarbons (HHs), halogenated aromatic hydrocarbons, and halogenated olefin. AHs (41.0 ± 26.3 µg/m³) were the dominant VOC type in the factory, followed by HHs (7.64 ± 6.52 µg/m³). As for the surrounding salt pans, HHs (89.6 ± 55.9 µg/m³), followed by AHs (20.9 ± 13.8 µg/m³). Generally, HHs and AHs were found to be potential cancer risks, especially 1,2-dichlorothane, 1,2-trichlorothane, and benzene. Furthermore, the diffusion of AHs or HHs from the study areas may affect the local residential area and school. AHs were the study region's most significant contributor to ozone formation potential. Consequently, this study provides detailed characteristics of VOCs in flame retardant industrial parks and contributes to developing targeted control strategies.

Cooperatives of waste pickers play a critical role in municipal solid waste management, contributing to public health, sanitation, and the environment by promoting resource circulation and reducing the amount of recyclable waste disposed of in landfills. Despite this, the majority of cooperatives lack an organized physical infrastructure and operational protocols for integrated waste management, which includes the stages of sorting, classification, processing, and marketing recyclable waste. In this work, an optimized survey was developed to assist waste pickers’ cooperatives in self-assessing their social, environmental, and economic performances. A questionnaire with nine dimensions was developed and automated to connect 16 driving forces (D), 74 pressure indicators (P), 23 states (S), 35 impacts (I), and 38 responses (R). The only action required was to choose each pressure indicator and apply the appropriate score level based on the cooperative's data analysis. The procedure eliminates subjective interpretation and identifies all indicators that require further consideration and discussion. As a result, the cooperative is able to propose highly targeted improvement measures. To demonstrate the benefits of the tool, the survey was applied in a waste picker's cooperative in a municipality in Brazil.

Heavy metal concentrations in dried fishes collected from four fishing villages of Kerala, India, have been assessed using atomic absorption spectrophotometry. Overall, metal concentrations in dry fishes were in the decreasing order: Zn>Pb>Cu>Cr>Cd. Except Pb and Cr, other metals assessed were within permissible limits. Higher accumulation of Pb may be attributed to anthropogenic sources of metals that are persistent in the southwest coast of India, especially the Kerala coast, due to extensive industrialization, urbanization, fishing and port activities. Thirty-six species of dried fishes collected from Azhikode and Munambam zones were found to have more metal accumulations. The metal pollution assessment of dried fishes indicated that Pb and Cr concentrations are higher in the Kerala coast. Further studies must be carried out in more dried fish species and other preserved seafood to ensure that the dried fishes processed from these polluted coastal zones do not cause any harm to the consumers.

Ambient fine particulate matter (PM_2.5) is a growing issue in Ho Chi Minh City (HCMC), the most populous province in Viet Nam. Estimating the benefits of reducing PM_2.5 levels has still been sparse in HCMC.

The study used the Environmental Benefits Mapping and Analysis Program – Community Edition (BenMAP-CE) to estimate the health, and economic benefits in three controlling scenarios of annual average PM_2.5 concentration in 2019 (28.9 µg/m³) rolling back to the World Health Organization's annual average Air Quality Guideline values of 5 µg/m³ (guideline value in 2021), and 10 µg/m³ (guideline value in 2005 which becomes Interim Target 4 of 2021 WHO Air Quality Guideline), and the Vietnamese annual average standard of 25 µg/m³.

The annual average concentration of PM_2.5 in 2019 was 28.9 µg/m³. Applying BenMAP-CE, the pooled number of avoided deaths of all causes was 3,785 (1,179–6,335), 3,195 (982–5,468), and 1,300 (384–2,386) for three scenarios, respectively. The economic benefits were $ 2.4 (0.8–4.1), $ 2.1 (0.6–3.5), and $ 0.8 (0.2–1.5) billion, using the Value of Statistical Life (VSL) of OECD (the Organization for Economic Cooperation and Development) and $ 3.7 (1.2–6.2), $ 3.1 (1.0–5.4) and $ 1.3 (0.4–2.3) billion, using the VSL of USEPA (the United States Environmental Protection Agency).

The annual average PM_2.5 concentration in HCMC exceeded the Vietnamese standard and WHO guidelines. Controlling PM_2.5 showed massive benefits for health and the economy; thus, the city should have action plans for mitigating the PM_2.5 pollution.

The usage and the demand for personal protective equipments (PPEs) for our day-to-day survival in this pandemic period of COVID-19 have seen a steep rise which has consequently led to improper disposal and littering. Fragmentation of these PPE units has eventually given way to micro-nano plastics (MNPs) emission in the various environmental matrices and exposure of living organisms to these MNPs has proven to be severely toxic. Numerous factors contribute to the toxicity imparted by these MNPs that mainly include their shape, size, functional groups and their chemical diversity. Even though multiple studies on the impacts of MNPs toxicity are available for other organisms, human cell line studies for various plastic polymers, other than the most common ones namely polyethylene (PE), polystyrene (PS) and polypropylene (PP), are still at their nascent stage and need to be explored more. In this article, we cover a concise review of the literature on the impact of these MNPs in biotic and human systems focusing on the constituents of the PPE units and the additives that are essentially used for their manufacturing. This review will subsequently identify the need to gather scientific evidence at the smaller level to help combat this microplastic pollution and induce a more in-depth understanding of its adverse effect on our existence.

Epidemiology research plays an important role in regulatory risk assessments. However, regulatory approaches to evaluating study utility and quality for risk assessment purposes can vary, even within a single agency. The goal of the current review is to compare different guidelines within the US Environmental Protection Agency (US EPA) for evaluating epidemiology research with respect to quality. This review highlights the elements of epidemiology design and reporting that are most useful for risk assessment and regulatory decision making. General guidance documents from the US EPA that assess pesticides (Office of Pesticide Programs Framework), air pollutants (Integrated Science Assessment Preamble), and environmental chemicals (Integrated Risk Information System Handbook) were included. Chemical-specific examples of the use of these guidance documents were selected to provide additional information on each methodology. All three evaluation approaches require professional judgment, and none include a quantitative scoring approach. All indicate numerous aspects that enhance the value of a study for risk assessment. However, the methods and the level of detail vary. More clarity within US EPA documents would aid researchers. The elements of the Matrix tool, designed to facilitate translation of epidemiology studies to risk assessment, build on the US EPA epidemiology guidelines and may further enhance the value of such studies.