Mobilisation of arsenic from bauxite residue (red mud) affected soils: effect of pH and redox conditions

The tailings dam breach at the Ajka alumina plant, western Hungary in 2010 introduced ~1 million m3 of red mud suspension into the surrounding area. Red mud (fine fraction bauxite residue) has a characteristically alkaline pH and contains several potentially toxic elements, including arsenic. Aerobic and anaerobic batch experiments were prepared using soils from near Ajka in order to investigate the effects of red mud addition on soil biogeochemistry and arsenic mobility in soil–water experiments representative of land affected by the red mud spill. XAS analysis showed that As was present in the red mud as As(V) in the form of arsenate. The remobilisation of red mud associated arsenate was highly pH dependent and the addition of phosphate to red mud suspensions greatly enhanced As release to solution. In aerobic batch experiments, where red mud was mixed with soils, As release to solution was highly dependent on pH. Carbonation of these alkaline solutions by dissolution of atmospheric CO2 reduced pH, which resulted in a decrease of aqueous As concentrations over time. However, this did not result in complete removal of aqueous As in any of the experiments. Carbonation did not occur in anaerobic experiments and pH remained high. Aqueous As concentrations initially increased in all the anaerobic red mud amended experiments, and then remained relatively constant as the systems became more reducing, both XANES and HPLC–ICP-MS showed that no As reduction processes occurred and that only As(V) species were present. These experiments show that there is the potential for increased As mobility in soil–water systems affected by red mud addition under both aerobic and anaerobic conditions

Advances in Understanding Environmental Risks of Red Mud After the Ajka Spill, Hungary

In the 5 years since the 2010 Ajka red mud spill (Hungary), there have been 46 scientific studies assessing the key risks and impacts associated with the largest single release of bauxite-processing residue (red mud) to the environment. These studies have provided insight into the main environmental concerns, as well as the effectiveness of remedial efforts that can inform future management of red mud elsewhere. The key immediate risks after the spill were associated with the highly caustic nature of the red mud slurry and fine particle size, which once desiccated, could generate fugitive dust. Studies on affected populations showed no major hazards identified beyond caustic exposure, while red mud dust risks were considered equal to or lesser than those provided by urban dusts of similar particle size distribution. The longer-term environmental risks were related to the saline nature of the spill material (salinization of inundated soils) and the release and the potential cycling of oxyanion-forming metals and metalloids (e.g., Al, As, Cr, Mo, and V) in the soil–water environment. Of these, those that are soluble at high pH, inefficiently removed from solution during dilution and likely to be exchangeable at ambient pH are of chief concern (e.g., Mo and V). Various ecotoxicological studies have identified negative impacts of red mud-amended soils and sediments at high volumes (typically [5 %) on different test organisms, with some evidence of molecularlevel impacts at high dose (e.g., genotoxic effects on plants and mice). These data provide a valuable database to inform future toxicological studies for red mud. However, extensive management efforts in the aftermath of the spill greatly limited these exposure risks through leachate neutralization and red mud recovery from the affected land. Monitoring of affected soils, stream sediments, waters and aquatic biota (fungi, invertebrates and fish) have all shown a very rapid recovery toward prespill conditions. The accident also prompted research that has also highlighted potential benefits of red mud use for critical raw material recovery (e.g., Ga, Co, V, rare earths, inform), carbon sequestration, biofuel crop production, and use as a soil ameliorant

Psychosocial Differences Between Urban and Rural People Living With HIV/AIDS

During the past decade, many investigations have examined the life circumstances of people living with HIV disease. Most of these studies, however, have focused on HIV‐infected people in large metropolitan areas. This study compares the psychosocial profiles of rural and urban people living with HIV disease. Anonymous, self‐administered surveys were completed by 276 people with HIV/AIDS in a Midwestern state. The assessment instrument measured respondents\u27 quality of life, perceptions of loneliness, social support, experiences with AIDS‐related discrimination, access to services, and illness‐related coping strategies. Compared with their urban counterparts, rural people with HIV reported a significantly lower satisfaction with life, lower perceptions of social support from family members and friends, reduced access to medical and mental health care, elevated levels of loneliness, more community stigma, heightened personal fear that their HIV serostatus would be learned by others, and more maladaptive coping strategies. Programs that are designed to improve the life circumstances of people with HIV disease in rural areas—particularly those that facilitate access to adequate health care, increase perceptions of social support, and improve illness‐related coping—are urgently needed

Psychosocial Predictors of Life Satisfaction among Persons Living with HIV Infection and AIDS

As AIDS becomes a more chronic but manageable illness, understanding quality of life issues among persons living with this disease has become an important goal of health care researchers. However, most quality of life investigations of persons living with HIV disease have relied heavily on clinical samples (e.g., hospitalized patients, psychiatric outpatients). The present study sought to identify psychosocial predictors of general life satisfaction in a community sample of 275 persons living with HIV/AIDS in a large midwestern state. Principal components and multiple regression analyses revealed that improved physical/functional well-being, increased social support, more frequent use of active coping strategies, and fewer incidents of AIDS-related discrimination and stigma predicted higher levels of general life satisfaction (R2=.39). Intervention strategies likely to produce higher levels of life satisfaction among persons living with HIV disease are discussed

HIV prevention programs of nongovernmental organizations in Latin America and the Caribbean: the Global AIDS Intervention Network project Programas de prevención de VIH de organizaciones no gubernamentales en América Latina y el Caribe.: El proyecto Global AIDS Intervention Network

OBJECTIVE: The objective of this paper is to describe HIV prevention programs conducted by nongovernmental organizations (NGO) that are meeting this challenge. METHODS: One NGO undertaking HIV prevention programs was evaluated in each of the 23 countries participating in the Global AIDS Intervention Network (GAIN) Project throughout Latin America and the Caribbean. A two-stage selection process was used: (1) a search in databases and other information sources; (2) identification of NGOs that were best established and most actively engaged in HIV prevention activity. Executive directors were questioned about staffing, budget issues, populations served and barriers faced by these entities. RESULTS: The 23 NGOs conducted 58 direct-service programs and had been conducting HIV prevention activities for a mean of 8 years (SD = 4.45; range 1-18 years). Average annual program budget was US$205 393 (range: US$ 10 000 to US$1 440 000). The NGOs reported a mean of 4.5 full-time employees (range 0-15, SD = 4.7). Many relied on volunteers (median = 10, mean = 51, range 0-700, SD = 150) to conduct HIV prevention activities. The NGOs provided prevention services for the general community (82.6$ 205 393 (intervalo de US$10 000 a US$ 1 440 000), y el número promedio de empleados a tiempo completo era de 4,5 (intervalo de 0-15, DE = 4,7.) Muchas ONG dependían de los voluntarios para los programas de prevención (mediana = 10, promedio = 51, intervalo de 0-700, DE = 150). Las ONG ofrecían programas de prevención dedicados a la comunidad en general (82,6%), a jóvenes y adolescentes (34,8%), y a hombres que tienen relaciones sexuales con otros hombres (30,4%). Las actividades de las ONG consistían en entrenar a los entrenadores para todo tipo de actividades (43,5%) y en realizar programas de prevención cara a cara con los participantes (34,8%). Se citaron como obstáculos la falta de fondos (60,9%) y la discriminación y estigma relacionados con la infección por el VIH (56,5%). CONCLUSIONES: Las estrategias que emplean estas ONG para sobrepasar las barreras a la prevención son prueba de su inventiva y dedicación y sirven como ejemplo para las ONG en otras regiones del mundo

HIV Prevention In Africa: Programs and Populations Served by Non-Governmental Organizations

The AIDS epidemic in Africa remains an urgent health crisis. Non-governmental organizations (NGOs) in Africa play a critical role in the delivery of HIV prevention services and assistance to persons living with AIDS. African NGOs are conducting numerous HIV prevention programs with several at-risk populations, yet their efforts have only rarely been systematically documented. To address this gap in the literature, the authors surveyed one NGO in each of 29 African countries regarding their HIV prevention activities and populations served. This report provides details concerning HIV prevention activities across the continent and describes in detail innovative programs from Togo and South Africa. NGOs in the present sample operate with modest budgets and small staff sizes, yet conduct programs that reach large segments of their communities. NGOs were most likely to report community-level interventions such as peer-education or community outreach. Faced with an epidemic where the main transmission occurs via heterosexual activity, African NGOs were most likely to direct their attention to the general public and to youth. NGOs in Africa are struggling to implement sustainable, cost-effective programs with few resources. Strengthening the infrastructure and capacity of these key agencies is crucial to fighting the AIDS epidemic in Africa