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Articles 1 - 19 of 19
Full-Text Articles in Physical Sciences and Mathematics
Clarification Of Rubber Mill Wastewater By A Plant Based Biopolymer – Comparison With Common Inorganic Coagulants, Sumona Mukherjee
Clarification Of Rubber Mill Wastewater By A Plant Based Biopolymer – Comparison With Common Inorganic Coagulants, Sumona Mukherjee
Sumona Mukherjee
Background In this study, the efficiency of Guar gum as a biopolymer has been compared with two other widely used inorganic coagulants, ferric chloride (FeCl3) and aluminum chloride (AlCl3), for the treatment of effluent collected from the rubber-washing tanks of a rubber concentrate factory. Settling velocity distribution curves were plotted to demonstrate the flocculating effect of FeCl3, AlCl3 and Guar gum. FeCl3 and AlCl3 displayed better turbidity removal than Guar gum at all settling velocities. Result FeCl3, AlCl3 and Guar gum removed 92.8%, 88.2% and 88.1% turbidity, respectively, of raw wastewater at a settling velocity of 0.1 cm min−1, respectively. …
Enhanced Adaptive Management: Integrating Decision Analysis, Scenario Analysis And Environmental Modeling For The Everglades, Matteo Convertino, Christy Foran, Jeffrey Keisler, Lynn Scarlett, Andrew Loschiavo, Greg Kiker, Igor Linkov
Enhanced Adaptive Management: Integrating Decision Analysis, Scenario Analysis And Environmental Modeling For The Everglades, Matteo Convertino, Christy Foran, Jeffrey Keisler, Lynn Scarlett, Andrew Loschiavo, Greg Kiker, Igor Linkov
Jeffrey Keisler
Individual And Combined Effects Of Land Use/Cover And Climate Change On Wolf Bay Watershed Streamflow In Southern Alabama, Ruoyu Wang
Ruoyu Wang
Turning Water Into Wine: The Political Economy Of The Environment In Southern California's Wine Country, Jason Simms
Turning Water Into Wine: The Political Economy Of The Environment In Southern California's Wine Country, Jason Simms
Jason L Simms
This dissertation examines questions of water sustainability in contexts of wine production and state-led neoliberal development in the Temecula Valley, southern California, where wine tourism is at present being harnessed as an engine of economic growth. Natural and anthropogenic forces, such as global climate change, desertification, urban development, and the marketization and commodification of natural resources, affect the distribution and availability of water throughout the globe. As a result, the use of water, and associated political and environmental processes and consequences, in the production of global commodities, including wheat, citrus, and coffee, recently have come under increased scrutiny. Given wine's …
Pilot Study Of Greater Boston Drinking Water Quality Changes - Impacts Of Ozonation And Distribution System, Irvine W. Wei, Xin (Cindy) Huang, Windsor Sung
Pilot Study Of Greater Boston Drinking Water Quality Changes - Impacts Of Ozonation And Distribution System, Irvine W. Wei, Xin (Cindy) Huang, Windsor Sung
Irvine W. Wei
The Massachusetts Water Resources Authority (MWRA) provides drinking water to 2.2 million people in Greater Boston. To ensure good water quality without filtration, the MWRA is about to replace chlorination with ozonation as the primary disinfection at the new Walnut Hill Water Treatment Plant, scheduled to be on-line in 2005. The objective of this study was to understand the influence of ozonation on monochloramine decay and pH change in the MWRA system. The influence of the distribution system, which consists of old cast-iron pipes, on the ozonated water was also investigated. A pilot plant, including a simulated distribution system with …
Cyclic Heating To Inhibit Bacterial Growth In Activated Carbon Point-Of-Use Treatment Devices, Irwin Silverstein, Irvine W. Wei
Cyclic Heating To Inhibit Bacterial Growth In Activated Carbon Point-Of-Use Treatment Devices, Irwin Silverstein, Irvine W. Wei
Irvine W. Wei
The effectiveness of using heat treatment on a cyclic basis as a means of inhibiting bacterial growth in activated carbon point-of-use treatment devices was examined. Heat treated and non-heat treated devices were compared in a controlled experiment with respect to parameters such as standard plate count, total organic carbon, total residual chlorine and head loss. The results of the study indicated that cyclic heat treatment can inhibit bacterial growth on the surface of granular activated carbon without compromising total organic carbon and total residual chlorine removal efficiencies or accelerating head loss. Microbiological testing verified that the control device had become …
Advanced Chemical Oxidation Of 2,4,6-Trichlorophenol By Using Fenton's Reagent - Dechlorination And Toxicity Reduction, Kuang-Wei (Stone) Chen, Irvine W. Wei
Advanced Chemical Oxidation Of 2,4,6-Trichlorophenol By Using Fenton's Reagent - Dechlorination And Toxicity Reduction, Kuang-Wei (Stone) Chen, Irvine W. Wei
Irvine W. Wei
Chlorinated phenols are priority pollutants, regulated by stringent discharge limits. The presence of chlorine increases the toxicity of these phenolic compounds and decreases their biodegradability. This study is to examine the removal of a priority chlorinated aromatic pollutant, 2,4,6-trichlorophenol (TCP), in aqueous solution by using Fenton's Reagent (a mixture of hydrogen peroxide and fenous iron catalyst), in terms of dechlorination and toxicity reduction. Test results indicate that the higher the molar ratio of H₂O₂ to TCP, the faster the release of chloride from TCP. However, the chloride released in all runs eventually approach the same level of theoretical chloride concentration, …
Port Fairy Flood Warning Assessment Project (Report), Neil Dufty
Port Fairy Flood Warning Assessment Project (Report), Neil Dufty
Neil Dufty
The assessment examined the following components of the Total Flood Warning System (TFWS) guided by the Australian Government’s Manual 21 – Flood Warning: 1. Understanding of flood risks and hazards 2. Emergency management planning 3. Community flood education 4. Data collection 5. Flood prediction and interpretation 6. Message construction 7. Message communication 8. Response 9. Review of the TFWS 10. Community and stakeholder consultation 11. Integration of the TFWS components. The assessment estimated that a TFWS at Port Fairy would provide reduction in damages of $400,274 over a 20 year life cycle. Moreover, it would improve public safety by markedly …
Russells Creek Total Flood Warning Scoping Study Project (Report), Neil Dufty
Russells Creek Total Flood Warning Scoping Study Project (Report), Neil Dufty
Neil Dufty
The assessment examined the components of the Total Flood Warning System (TFWS) based on the Australian Government’s Manual 21 – Flood Warning. The TFWS components examined were: 1. Understanding of flood risks and hazards 2. Emergency management planning 3. Community flood education 4. Data collection 5. Flood prediction and interpretation 6. Message construction 7. Message communication 8. Response 9. Review of the TFWS 10. Community and stakeholder consultation The assessment found that due to a very short warning time of up to one hour it is not possible to build a TFWS across all of the above components. The best …
Climate Change Adaptation Chapter: Marshfield, Massachusetts, Joshua H. Chase, Jonathan G. Cooper, Rory Elizabeth Fitzgerald, Filipe Antunes Lima, Sally R. Miller, Toni Marie Pignatelli
Climate Change Adaptation Chapter: Marshfield, Massachusetts, Joshua H. Chase, Jonathan G. Cooper, Rory Elizabeth Fitzgerald, Filipe Antunes Lima, Sally R. Miller, Toni Marie Pignatelli
Jonathan G. Cooper
Climate change, understood as a statistically significant variation in the mean state of the climate or its variability, is the greatest environmental challenge of this generation (Intergovernmental Panel on Climate Change, 2001). Marshfield is already being affected by changes in the climate that will have a profound effect on the town’s economy, public health, coastal resources, natural features, water systems, and public and private infrastructure. Adaptation strategies have been widely recognized as playing an important role in improving a community’s ability to respond to climate stressors by resisting damage and recovering quickly. Based on review of climate projections for the …
Research Report: Water User Dimensions Of Meter Implementation On Secondary Pressurized Irrigation Systems, Joanna Endter-Wada, Diana Glenn, Clayton Lewis, Roger Kjelgren, Christopher Neale
Research Report: Water User Dimensions Of Meter Implementation On Secondary Pressurized Irrigation Systems, Joanna Endter-Wada, Diana Glenn, Clayton Lewis, Roger Kjelgren, Christopher Neale
Joanna Endter-Wada
Weber Basin Water Conservancy District (District) secured Bureau of Reclamation funding in spring 2011 to install individual secondary water meters at residential connections in order to implement water efficiency and accountability measures included in the District’s Water Conservation Plan (Weber Basin Water Conservancy District, 2010). Initially, the District will not use the meters for billing water use but, instead, will use them to help the District determine if end users are exceeding their contracted allotment of water and to promote water use accountability.The purpose of the study titled “Water User Dimensions of Meter Implementation on Secondary Pressurized Irrigation Systems” conducted …
The Reclamation Of Boston Harbor: A Scientist's Perspective, Gordon T. Wallace Jr.
The Reclamation Of Boston Harbor: A Scientist's Perspective, Gordon T. Wallace Jr.
Gordon Wallace
A major effort, costing in the neighborhood of $2 billion, is under way to restore the environmental quality of Boston Harbor. While Boston Harbor is unquestionably one of the most polluted urban estuaries in the world, it is also one of the least understood with respect to the basic physics, chemistry, and biology involved. This information is essential for the purpose of identifying processes that control the transport, effect, and fate of contaminants entering the estuary. Failure to obtain this information may lead to continued inappropriate and unnecessarily expensive solutions to a complex environmental problem. An effective solution will require …
Climate Change Adaptation Chapter: Marshfield, Massachusetts, Joshua H. Chase, Jonathan G. Cooper, Rory Elizabeth Fitzgerald, Filipe Antunes Lima, Sally R. Miller, Toni Marie Pignatelli
Climate Change Adaptation Chapter: Marshfield, Massachusetts, Joshua H. Chase, Jonathan G. Cooper, Rory Elizabeth Fitzgerald, Filipe Antunes Lima, Sally R. Miller, Toni Marie Pignatelli
Sally Miller
Climate change, understood as a statistically significant variation in the mean state of the climate or its variability, is the greatest environmental challenge of this generation (Intergovernmental Panel on Climate Change, 2001). Marshfield is already being affected by changes in the climate that will have a profound effect on the town’s economy, public health, coastal resources, natural features, water systems, and public and private infrastructure. Adaptation strategies have been widely recognized as playing an important role in improving a community’s ability to respond to climate stressors by resisting damage and recovering quickly. Based on review of climate projections for the …
Can The Causeway In The Great Salt Lake Be Used To Manage Salinity, Sarah E. Null, Wayne A. Wurtsbaugh, Craig Miller
Can The Causeway In The Great Salt Lake Be Used To Manage Salinity, Sarah E. Null, Wayne A. Wurtsbaugh, Craig Miller
Wayne A. Wurtsbaugh
No abstract provided.
Classification Of The Alterations Of Beaver Dams To Headwater Streams In Northeastern Connecticut, U.S.A., Denise Burchsted, Melinda D. Daniels
Classification Of The Alterations Of Beaver Dams To Headwater Streams In Northeastern Connecticut, U.S.A., Denise Burchsted, Melinda D. Daniels
Denise Burchsted
Of the many types of barriers to water flow, beaver dams are among the smallest, typically lasting less than a decade and rarely exceeding 1.5 m in height. They are also among the most frequent and common obstructions in rivers, with a density often exceeding ten dams per km, a frequency of construction within a given network on a time scale of years, and a historic extent covering most of North America. Past quantification of the geomorphologic impact of beaver dams has primarily been limited to local impacts within individual impoundments and is of limited geographic scope. To assess the …
Variation Of Hyporheic Temperature Profiles In A Low Gradient Third-Order Agricultural Stream – A Statistical Approach, Vanessa Beach, Eric Wade Peterson
Variation Of Hyporheic Temperature Profiles In A Low Gradient Third-Order Agricultural Stream – A Statistical Approach, Vanessa Beach, Eric Wade Peterson
Eric Wade Peterson
Sediment size governs advection, controlling the hydraulic conductivity of the stratum, and conduction, influencing the amount of surface area in contact between the sediment particles. To understand the role of sediment particle size on thermal profiles within the hyporheic zone, a statistical approach, involving general summary statistics and time series cross-correlation, was employed. Data were collected along two riffles: Site 1: gravel (d50 = 3.9 mm) and Site 2: sand (d50 = 0.94 mm).Temperature probe grids collected 15-minute temperature data at 30, 60, 90, and 140 cm below the streambed surface over a 6-month period. Surface water and air temperature …
Chapter 7: Freshwater And Sanitation, Stanley Mubako
Chapter 7: Freshwater And Sanitation, Stanley Mubako
Stanley Mubako
No abstract provided.
Input–Output Analysis Of Virtual Water Transfers: Case Study Of California And Illinois, Stanley Mubako
Input–Output Analysis Of Virtual Water Transfers: Case Study Of California And Illinois, Stanley Mubako
Stanley Mubako
No abstract provided.
Agricultural Virtual Water Trade And Water Footprint Of U.S. States, Stanley Mubako
Agricultural Virtual Water Trade And Water Footprint Of U.S. States, Stanley Mubako
Stanley Mubako
No abstract provided.