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排序方式: 共有722条查询结果,搜索用时 15 毫秒
711.
Identifying the cause of toxicity in an algal whole effluent toxicity study - an unanticipated toxicant 总被引:1,自引:0,他引:1
Toxicity was observed in whole effluent toxicity (WET) studies with the freshwater alga, Pseudokirchneriella subcapitata, in three consecutive monthly studies, (NOEC = 50-75%). Toxicity was not observed to Ceriodaphnia dubia or the fathead minnow, Pimephales promelas in concurrent studies. Selected toxicity identification evaluation (TIE) tests were conducted in a tiered approach to eliminate possible toxicants and progressively identify the causative agent. Filtration following alkaline adjustment (pH 10 or 11) was effective in eliminating significant growth effects and also reduced phosphate concentration. The TIE studies confirmed that the observed effluent toxicity was caused by excess ortho-phosphate in the effluent not by overstimulation or related to unfavorable N:P ratios; but due to direct toxicity. The 96-h 25% inhibition concentration (IC25) of ortho-phosphate to P. subcapitata was 3.4 mg L−1 while the maximum acceptable toxicant concentration was 4.8 mg L−1. This study illustrates the value of multi-species testing and also provides an example of an effective TIE using algae identifying an unanticipated toxicant. 相似文献
712.
Maryam Kalantarnia Faisal Khan Kelly Hawboldt 《Journal of Loss Prevention in the Process Industries》2009,22(5):600-606
To ensure the safety of a process system, engineers use different methods to identify the potential hazards that may cause severe consequences. One of the most popular methods used is quantitative risk assessment (QRA) which quantifies the risk associated with a particular process activity. One of QRA's major disadvantages is its inability to update risk during the life of a process. As the process operates, abnormal events will result in incidents and near misses. These events are often called accident precursors. A conventional QRA process is unable to use the accident precursor information to revise the risk profile. To overcome this, a methodology has been proposed based on the work of Meel and Seider (2006). Similar to Meel and Seider (2006) work, this methodology uses Bayesian theory to update the likelihood of the event occurrence and also failure probability of the safety system. In this paper the proposed methodology is outlined and its application is demonstrated using a simple case study. First, potential accident scenarios are identified and represented in terms of an event tree, next, using the event tree and available failure data end-state probabilities are estimated. Subsequently, using the available accident precursor data, safety system failure likelihood and event tree end-state probabilities are revised. The methodology has been simulated using deterministic (point value) as well as probabilistic approach. This Methodology is applied to a case study demonstrating a storage tank containing highly hazardous chemicals. The comparison between conventional QRA and the results from dynamic failure assessment approach shows the significant deviation in system failure frequency throughout the life time of the process unit. 相似文献
713.
Costa João Paulo R. Gomes Guilherme J. C. Fernandes Gilberto Magarinos Dario M. Fonseca Alberto Pires Patrício J. M. 《Journal of Material Cycles and Waste Management》2023,25(1):128-143
Journal of Material Cycles and Waste Management - Mining sites are vulnerable to erosion and siltation of rivers. While the construction of rockfill dikes can mitigate siltation, existing rockfill... 相似文献
714.
Pedro Mayor Hani R. El Bizri Thais Q. Morcatty Kelly Moya Nora Bendayán Samantha Solis Carlos F. A. Vasconcelos Neto Maire Kirkland Omar Arevalo Tula G. Fang Pedro E. Pérez-Peña Richard E. Bodmer 《Conservation biology》2022,36(2):e13801
The trade in wild meat is an important economic component of rural people's livelihoods, but it has been perceived to be among the main causes of the decline of wildlife species. Recently, the COVID-19 pandemic has brought to light an additional concern of wildlife markets as a major human-health challenge. We analyzed data from the largest longitudinal monitoring (1973–2018) of the most important urban wild-meat markets in Iquitos, Peru, to examine the trends in and impacts of these markets on people's livelihoods. Over the last 45 years, wild meat sales increased at a rate of 6.4 t/year (SD 2.17), paralleling urban population growth. Wild meat sales were highest in 2018 (442 t), contributing US$2.6 million (0.76%) to the regional gross domestic product. Five species of ungulates and rodents accounted for 88.5% of the amount of biomass traded. Vulnerable and Endangered species represented 7.0% and 0.4% of individuals sold, respectively. Despite growth in sales, the contribution of wild meat to overall urban diet was constant: 1–2%/year of total meat consumed. This result was due to greater availability and higher consumption of cheaper meats (e.g., in 2018, poultry was 45.8% cheaper and was the most consumed meat) coupled with the lack of economic incentives to harvest wild meat species in rural areas. Most wild meat was sold salted or smoked, reducing the likelihood of foodborne diseases. Community-based wildlife management plans and the continued trade bans on primates and threatened taxa may avoid biodiversity loss. Considering the recent COVID-19 pandemic, future management plans should include potential viral hosts and regulation and enforcement of hygiene practices in wild-meat markets. 相似文献
715.
Schirmer Waldir Nagel dos Santos Liliana Andréa Martins Kelly Geronazzo Gueri Matheus Vitor Diniz Jucá José Fernando Thomé 《Journal of Material Cycles and Waste Management》2023,25(5):2887-2899
Journal of Material Cycles and Waste Management - Anaerobic digestion of the organic fraction of municipal solid wastes is a well-established process for biogas production and various forms of... 相似文献
716.
Mol Marcos Paulo Gomes Zolnikov Tara Rava Neves Arthur Couto dos Santos Giulia Roriz Tolentino Júlia Luiza Lopes de Vasconcelos Barros Raphael Tobias Heller Leo 《Environmental science and pollution research international》2022,29(28):42466-42475
Environmental Science and Pollution Research - There are increasing worldwide concerns about the negative impacts of healthcare waste generated in hospitals, especially in low- and middle-income... 相似文献
717.
Majaron Vinícius F. da Silva Marisa Gomes Bortoletto-Santos Ricardo Klaic Rodrigo Ribeiro Sidney J. L. Polito Wagner L. Bevilaqua Denise Farinas Cristiane S. Ribeiro Caue 《Journal of Polymers and the Environment》2022,30(6):2602-2613
Journal of Polymers and the Environment - Fertilization is essential to provide suitable conditions for plant development and crop productivity, but the environmental cost of fertilizers is a... 相似文献
718.
Diório Alexandre Díaz-Angulo Jennyfer Castellanos Reynel M. Gomes Ana I. Bergamasco Rosângela Vieira Marcelo Fernandes Dezotti Márcia Mueses Miguel Angel Machuca-Martinez Fiderman Vilar Vítor J. P. 《Environmental science and pollution research international》2022,29(28):42120-42129
Environmental Science and Pollution Research - This work aims to integrate several hydrogen peroxide (H2O2) activation mechanisms, photolysis (UVC irradiation), chemical electron transfer (TiO2-P25... 相似文献
719.
Lima Fernando Santos Scalize Paulo Sérgio Gabriel Ellen Flávia Moreira Gomes Raylane Pereira Gama Aline Rodrigues Demoliner Meriane Spilki Fernando Rosado Vieira José Daniel Gonçalves Carneiro Lilian Carla 《Food and environmental virology》2022,14(1):77-88
Food and Environmental Virology - Rural environments lack basic sanitation services. Facilities for obtaining water and disposing sewage are often under the initiative of each resident, who may not... 相似文献
720.
Carvalho Barros Giselle Kalline Gomes Duarte Lindemberg Jesus Nogueira Melo Ricardo Paulo Fonseca Lopes Francisco Wendell Bezerra Barros Neto Eduardo Lins 《Journal of Polymers and the Environment》2022,30(6):2534-2546
Journal of Polymers and the Environment - The environmental impacts caused by dyes in industrial wastewater are incalculable, due to their adverse effects on the ecosystem and human life,... 相似文献