Evaluation on an On-site Stormwater Treatment Device for Sediment Flux Mitigation in the Lake Tahoe Basin PDF Download
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Author: Stacy Costello
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 196
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Book Description
Author: Stacy Costello
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 196
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Book Description
Author: Brian D. Ridenoure
Publisher:
ISBN:
Category : Sediment control
Languages : en
Pages : 248
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Book Description
Author: Vijay Kumar Eppakayala
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 750
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Book Description
Discharges from industrial activities may contain various hazardous pollutants including metals, oils and grease, organic toxicants, chemical oxygen demand, nutrients and suspended sediment. Limited information is available on the characteristics of the pollutant constituents that affect treatment and treatment technologies that can effectively treat the runoff from industrial activities. Understanding the association of contaminants with different particle sizes is important for determining suitable treatment controls. The primary objective of this research was to evaluate the performance of treatment controls (a pre-treatment hydrodynamic separator device followed by a dry infiltration pond) at a heavy industrial site and describe the pollutant characteristics that affect stormwater treatability for different flow conditions. Water quality monitoring through a seven month monitoring period showed that suspended sediment concentrations (SSC), COD, nutrients, and heavy metals were commonly found in the industrial runoff. Multivariate analyses were performed to identify the correlations between site hydrological and water quality parameters. The calculations showed strong correlations between hydrological parameters. Strong correlations were also observed between suspended sediment and metal concentrations. Treatment performance was evaluated based on the particle size distributions using several data exploratory methods. These showed that the hydrodynamic separator device had low to moderate reductions for SSC and low reductions for metals. The Hydrodynamic separator device also showed moderate reductions for particle sizes greater than 12 μm. The dry infiltration pond showed very high removals for particulate solids concentrations and mass, medium to high removals for heavy metal concentrations and high removals for masses of the metals. Significant moderate to high reductions in concentration and mass were observed for particle sizes greater than 3μm. The dry pond also showed high runoff reductions (75 to 100%) for storm events smaller than 1.5 inches and associated high removals of pollutant masses for all constituents and moderate runoff reductions (about 50%) for events greater than 1.5 inches. As part of this research, groundwater contamination potential was evaluated based on measured metal concentrations in the soil profile under the dry infiltration pond and by using a water chemistry vadose zone fate model. The results indicated high retention capacity of both particulate-bound and filtered metals in the surface soils in the pond. Vadose zone chemical fate modeling showed retention of metals to the soils at depths well above the water table. However, the increased runoff entering the pond greatly accelerates the pollutant migration in the subsurface, with metals potential reaching about a meter below the ground surface during a 50 year operational period. Other pollutants having greater mobility (such as nitrates) could reach the several meter deep water table quickly and, if present in problematic concentrations, result in potential groundwater contamination.
Author: Brian Keith Currier
Publisher:
ISBN:
Category :
Languages : en
Pages : 214
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Book Description
Author: Jeffry G. Curtis
Publisher:
ISBN: 9781109967685
Category : Runoff
Languages : en
Pages : 586
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Book Description
In one investigation, 20 different commercial formulations were jar tested using four stormwaters with diverse properties. Results showed that as a class of treatment chemicals, the polyaluminum chloride (PACl) products containing sulfate in their formulation (polyaluminum hydroxychlorosulfates) were particularly effective in reducing turbidity. The second best performing class of chemicals in treating the stormwaters were the PACl/polymer blends.
Author: Melissa K. Gunter
Publisher:
ISBN:
Category : Nutrient pollution of water
Languages : en
Pages : 592
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Book Description
Author: Alan Heyvaert
Publisher:
ISBN:
Category : Periphyton
Languages : en
Pages : 68
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Book Description
A demonstration project utilizing cultured periphyton to treat stormwater runoff was constructed, operated, and monitored for approximately nine months in 2008, located near a set of existing stormwater ponds in Incline Village, Nevada. The main goal of this project was to demonstrate the applicability and effectiveness of periphyton-based cultured ecologies as a biologically-based advanced treatment system to reduce fine sediment particles and nutrient loads entering lake Tahoe. The site selection process demonstrated potential for application of this cultured periphyton technology to a wide range of places and situations in the Tahoe Basin. Active deployment would require modest infrastructure development to provide the electricity and baseflow. Because the cultured periphyton system is modular, it can be sized for each site to accommodate the anticipated runoff volumes requiring treatment. As a polishing system for a detention basin or a wetland, the cultured periphyton system can remove dissolved nutrients and fine sediments to levels not achieved by basins or wetlands alone. Initial estimates indicate that runoff from a small neighborhood catchment with a design storm volume of 5,000 cubic feet could be treated over a period of three days with a setup of around 3.5 times the size of this demonstration system.
Author:
Publisher:
ISBN:
Category : Storm sewers
Languages : en
Pages : 102
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Book Description
Author: Matthew Allen Wilson
Publisher:
ISBN:
Category : Storm sewers
Languages : en
Pages : 80
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Book Description
The objectives of this research were threefold: to investigate the feasibility and practicality of field testing to assess the performance of underground devices used for stormwater treatment in urban areas; evaluate the effects of sediment size and stormwater flow rate on the performance of four different manufactured devices; and to develop a universal approach for predicting the performance of a device for any given application. Field testing that used a controlled and reproducible synthetic storm event that contained sediment of a fixed size distribution and concentration fed to pre-cleaned devices led to the development of uniform performance models. The results of this project show that controlled field tests are a practical, robust and accurate means of determining an underground device's performance, based on solid size distribution and density of the influent, in addition to water discharge and temperature. This premise was successfully verified in field tests on four devices and in laboratory tests on two devices. The resulting protocol and results of testing will be a useful tool for consultants, manufacturers, local governments, and state agencies for selecting, sizing, and evaluating stormwater treatment technologies to protect water resources.
Author: Lois Jane Oulton
Publisher:
ISBN:
Category : Runoff
Languages : en
Pages : 274
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Book Description
Stormwater runoff is widely recognised as a primary source of pollution and cause of negative ecological effects in urban river networks. In an effort to mitigate the degradation of receiving waters, tertiary stormwater treatment devices, such as constructed wetlands and bioretention systems, are increasingly being retrofitted to urban catchments at a considerable cost as part of the Water Sensitive Urban Design (WSUD) strategy. These devices reduce the direct connection of impervious areas to receiving waterways and have the potential to combine natural biological, chemical and physical processes to treat urban stormwater runoff. However, there has been relatively limited field validation of their benefits, particularly under Australian conditions and in terms of improving ecological health, despite their increasing popularity as part of urban water policies and strategies.
