Risk and Cost Assessment of Nitrate Contamination in Domestic Wells

This study combines empirical predictive and economics models to estimate the cost of remediation for domestic wells exceeding suggested treatment thresholds for nitrates. A multiple logistic regression model predicted the probability of well contamination by nitrate, and a life cycle costing methodology was used to estimate costs of nitrate contamination in groundwater in two areas of Nebraska. In south-central Nebraska, 37% of wells were estimated to be at risk of exceeding a threshold of 7.5 mg/L as N, and 17% were at risk of exceeding 10 mg/L as N, the legal limit for human consumption in the United States. In an area in northeastern Nebraska, 82% of wells were at risk of exceeding the 10 mg/L as N legal threshold. Reverse osmosis Point-of-Use (POU) treatment was the option with the lowest costs for a household (3–4 individuals), with an average of $4–$164 total regional cost per household per year depending on the threshold for treatment. Ion exchange and distillation were the next most cost-effective options. At the community level (~10,000 individuals), a reverse osmosis Point-of-Entry (POE) treatment system was the most expensive option for a community due to high initial costs and ongoing operation and maintenance costs, whereas the biological denitrification system was least expensive due to economies of scale. This study demonstrates integrated modeling methods to assess water treatment costs over time associated with groundwater nitrate contamination, including quantification of at-risk wells, and identifies suitable options for treatment systems for rural households and communities based on their cost

The long term effect of agricultural, vadose zone and climatic factors on nitrate contamination in Nebraska\u27s groundwater system

A four-decade dataset (1974–2013) of 107,823 nitrate samples in 25,993 wells from western and eastern parts of Nebraska was used to assess long-term trends of groundwater nitrate concentration and decadal changes in the extent of groundwater nitrate-contaminated areas (NO3-N≥10 mg N/L) over the entire state. Spatial statistics and regressions were used to investigate the relationships between groundwater nitrate concentrations and several potential natural and anthropogenic factors, including soil drainage capacities, vadose zone characteristics, crop production areas, and irrigation systems. The results of this study show that there is no statistically significant trend in groundwater nitrate concentrations in western Nebraska, in contrast with the increasing trend (p \u3c .05) to the east. The spatial extent and nitrate concentrations in contaminated groundwater in center pivot-irrigated areas was less than in gravity-irrigated areas. Areas with a thicker vadose zone and larger saturated thickness of the aquifer have relatively lower nitrate concentrations. The results of a classification and regression tree (CART) model indicate the difference in the influence of physical factors on groundwater nitrate concentrations between western and eastern Nebraska, namely that groundwater nitrate concentrations correspond with vadose zone thickness, effective hydraulic conductivity, and saturated thickness in the west, while in eastern Nebraska, concentrations are correlated with average percent sand in the topsoil (0–150 cm), well depth, and effective hydraulic conductivity

Risk and Cost Assessment of Nitrate Contamination in Domestic Wells

This study combines empirical predictive and economics models to estimate the cost of remediation for domestic wells exceeding suggested treatment thresholds for nitrates. A multiple logistic regression model predicted the probability of well contamination by nitrate, and a life cycle costing methodology was used to estimate costs of nitrate contamination in groundwater in two areas of Nebraska. In south-central Nebraska, 37% of wells were estimated to be at risk of exceeding a threshold of 7.5 mg/L as N, and 17% were at risk of exceeding 10 mg/L as N, the legal limit for human consumption in the United States. In an area in northeastern Nebraska, 82% of wells were at risk of exceeding the 10 mg/L as N legal threshold. Reverse osmosis Point-of-Use (POU) treatment was the option with the lowest costs for a household (3–4 individuals), with an average of $4–$164 total regional cost per household per year depending on the threshold for treatment. Ion exchange and distillation were the next most cost-effective options. At the community level (~10,000 individuals), a reverse osmosis Point-of-Entry (POE) treatment system was the most expensive option for a community due to high initial costs and ongoing operation and maintenance costs, whereas the biological denitrification system was least expensive due to economies of scale. This study demonstrates integrated modeling methods to assess water treatment costs over time associated with groundwater nitrate contamination, including quantification of at-risk wells, and identifies suitable options for treatment systems for rural households and communities based on their cost

What does Twitter say about COVID-19 vaccines?

Background and objectives: Vaccines to reduce the level of hospitalisations and death from COVID-19 became available in certain countries from December 2020. This study aimed to analyse social media content shared on Twitter regarding COVID-19 vaccines on a random day to obtain insights into publicly expressed opinions on these vaccines. Method: English language tweets, regardless of country of origin, were collected through NCapture from a 24-hour time period between 06/11/2022 and 07/11/2022 using the search term “COVID-19 vaccines”. NVivo aided content analysis was conducted on all obtained tweets; tweets unrelated to the study aim were coded as irrelevant and subsequently excluded from analysis. The study was exploratory in nature, without an underlying hypothesis. Results: Overall, 1284 tweets were captured. A total of 67 different codes were created with 50 of those directly relating to opinions and/or information about COVID-19 vaccines; 41.8% of which were negative and 34.3% positive. Positive tweets related to, e.g., encouraging the public to get the vaccine; reductions in COVID-19 related health burdens; and providing links to scientific studies. In contrast, negative tweets warned of potential dangers associated with vaccines, primarily highlighting side effects; and reiterated prevalent conspiracy theories. Conclusion: Overall, opinions on Twitter regarding COVID-19 vaccines showed considerable variation on the day the tweets were captured. Nevertheless, there was a notable number of tweets providing links to reliable studies on COVID-19 vaccines, indicating that many Twitter users may aim to provide reliable information regarding COVID-19 vaccines

Interfaith Approach to Elder Abuse: Developing a Screening Tool to Assist Faith Leaders Reporting of Elder Abuse

Background: Elder abuse is a complex public health issue that is receiving more media attention. The National Academies of Sciences defined elder abuse as either creating intentional harm or serious risk of harm towards a vulnerable elder, or the failure to satisfy the basic needs of an elder and protect them from harm (2002).Lachs and Pillemer (2004) reviewed the clinical and legal reports on elder abuse and have identified five main types: physical abuse, psychological abuse, sexual assault, material exploitation, and neglect. Previous research has demonstrated elders who have been abused to have higher rates of depression and chronic stress (Comijs et al., 1999), increased rates of post-traumatic stress disorder (Goldstein, 1996), increased helplessness, social isolation, and anxiety (Soloman, 1983; Booth, Bruno, and Marin, 1996), as well as decreased physical health outcomes (Lachs et al., 1998). Past research also demonstrates elders maintaining a strong relationship with their religious identity (Young and Dowling, 1987). Additionally, elders consider faith leaders at a high level of trust almost as important as the level of trust displayed toward their own family members (Daciuk, 2000). Main objectives: 1.) Provide basic information on elder abuse in Connecticut, 2.) Assess baseline knowledge and attitudes of elder abuse among faith leaders, 3.) Identify existing barriers that faith leaders may face when they suspect elder abuse, and 4.) Create a culturally relevant tool for faith leaders to detect elder abuse. Conclusion: The faith leader surveys and the semi-structured interview data collected on elder abuse detection and reporting and elder’s faith experiences in Southern Connecticut, respectively, is critical information to gain a deeper understanding of the complexity of elder justice. Future directions include pilot testing, reviewing, and eventually disseminating the Digital Detection Tool for Faith Leaders in Southern Connecticut to assist faith leaders in detecting and reporting elder abuse.https://elischolar.library.yale.edu/ysph_pbchrr/1046/thumbnail.jp

Methods for Managing Human–Deer Conflicts in Urban, Suburban, and Exurban Areas

This monograph identifies challenges and benefits associated with many human–deer conflict mitigation actions as well as methods to monitor the response of deer populations to management actions. Deer exploit urban, suburban, and exurban areas where human populations provide anthropogenic attractants, either intentionally or inadvertently, which often leads to human–deer conflicts. Mitigating actions have varying degrees of efficacy and may not be effective or accepted in every situation. Wildlife and municipal managers must work together to seek methods to reduce attractants, mitigate conflicts, and perpetuate the conservation of wildlife species that adds to the appreciation of nature in our lives.https://digitalcommons.usu.edu/hwi_monographs/1001/thumbnail.jp