Wastewater Treatment Using A Constructed Wetland And Recirculating Gravel Filter System
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Wastewater Treatment Using A Constructed Wetland And Recirculating Gravel Filter System
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Author : Gregory Lynn Askew
language : en
Publisher:
Release Date : 1993
Wastewater Treatment Using A Constructed Wetland And Recirculating Gravel Filter System written by Gregory Lynn Askew and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Constructed wetlands categories.
Evaluation Of Onsite Preanoxic Recirculating Gravel Filter Wastewater Treatment Systems For Nitrogen Removal
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Author : Stephany Wei
language : en
Publisher:
Release Date : 2013
Evaluation Of Onsite Preanoxic Recirculating Gravel Filter Wastewater Treatment Systems For Nitrogen Removal written by Stephany Wei and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Approximately 25 percent of the United States population is served by conventional onsite wastewater treatment systems (OWTS), which consist of a septic tank followed by a soil adsorption field with subsurface effluent dispersion. OWTS have limited nitrogen removal ability, and in some locations their nitrogen loading contributes to eutrophication and impairs groundwater for potable uses. Consequently, there is a need for OWTS with improved nitrogen removal efficiency. The design of onsite nitrogen removal systems should be simple with minimal mechanical equipment and chemical addition. These systems should also require very little operating attention and provide reliable nitrogen removal performance under varying household load conditions. This study evaluated the long-term performance of two new designs intended to meet these requirements while also producing an average total nitrogen effluent concentration of less than 20 mg/L. The designs tested were modifications of recirculating gravel filters (RGF), which have been used for many years. RGFs are easy to operate and are proven to be highly effective for the removal of organic pollutants such as biochemical oxygen demand (BOD) and total suspended solids (TSS), as well as biological oxidation of ammonia to nitrate. The modified RGF systems included an anoxic zone below the normal aerobic zone in which flow from the upper zone contacted septic tank effluent flow to promote biological denitrification for nitrogen removal. The systems were considered passive nitrogen removal systems because they do not require an exogenous carbon source. The differences between the two system designs included one having a vegetated aerobic zone (Vegetated RGF) and the other having a layer of oyster shells at the top of aerobic zone, and a different anoxic zone inlet design and upflow flow pattern (Enhanced RGF) versus a horizontal anoxic zone flow pattern for the Vegetated RGF. Each system treated 480 gallon/day of domestic wastewater with a typical diurnal flow pattern. Their performance was evaluated for twelve months, which also included five stress tests that simulated extreme wash loads conditions, low loading periods, vacation interruptions, and power failure that might occur for a single home. This research evaluated and compared the performance of these systems in regards to nitrogen, BOD, TSS, total phosphorus (TP), and fecal coliform removal. Their responses to the stress tests and the effect of temperature were also assessed. The Vegetated RGF achieved high average treatment efficiencies for BOD (98%), TSS (99%), and fecal coliform (1.4 log reduction). The Enhanced RGF was equally effective at removing BOD (97%), TSS (99%), and fecal coliform (1.1 log reduction). Both systems achieved a total phosphorus removal efficiency of about 40 percent. The effluent annual average total nitrogen concentrations were 15.2 and 8.6 mg/L with 95th percentiles of 18.5 and 12.3 mg/L for the Vegetated RGF and Enhanced RGF systems, respectively. Both the Vegetated and Enhanced RGF systems had good nitrification efficiency, but some operational clogging in the feed distribution piping did cause higher effluent ammonia concentrations. The larger aerobic volume and lower nitrogen loading to the Vegetated RGF system provided a higher nitrification efficiency compared to the Enhanced RGF. A much greater denitrification efficiency was observed for the Enhanced RGF system compared to the Vegetated RGF system due to its improved method of contacting the nitrified flow from the upper aerobic zone and the septic tank effluent.
Performance Of A Recirculating Gravel Filter And Wisconsin Mound Wastewater Treatment System
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Author : Sebastien Garcia-Cuenca
language : en
Publisher:
Release Date : 2006
Performance Of A Recirculating Gravel Filter And Wisconsin Mound Wastewater Treatment System written by Sebastien Garcia-Cuenca and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Sewage categories.
Natural Wastewater Treatment Systems
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Author : Ronald W. Crites
language : en
Publisher: CRC Press
Release Date : 2014-03-14
Natural Wastewater Treatment Systems written by Ronald W. Crites and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-03-14 with Technology & Engineering categories.
Calling for ecologically and economically sound wastewater treatment systems, the authors of Natural Wastewater Treatment Systems explore the use of wetlands, sprinkler or deep irrigation, groundwater recharge, and other natural systems as sustainable methods for the treatment and management of wastewater. Based on work by prominent experts in natu
Food Processing Wastewater Treatment Using A Constructed Wetland In Parallel With A Slow Sand Filter
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Author : Sonja L. Boynton
language : en
Publisher:
Release Date : 2003
Food Processing Wastewater Treatment Using A Constructed Wetland In Parallel With A Slow Sand Filter written by Sonja L. Boynton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Water reuse categories.
Vertical Flow Constructed Wetlands
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Author : Alexandros Stefanakis
language : en
Publisher: Newnes
Release Date : 2014-06-26
Vertical Flow Constructed Wetlands written by Alexandros Stefanakis and has been published by Newnes this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-06-26 with Technology & Engineering categories.
Vertical flow constructed wetlands for wastewater and sludge treatment represent a relatively new and still growing technology. Vertical Flow Constructed Wetlands is the first book to present the state-of-the-art knowledge regarding vertical flow constructed wetlands theory and applications. In this book, you will learn about vertical flow systems with information about application and performance. Vertical Flow Constructed Wetlands also includes information on how different countries are applying the technology, with design guidelines to illustrate best practices worldwide. A focus on water conservation through reuse of treated water showcases the benefit of vertical flow construction, which has greatly increased the attractiveness of the technology in recent years. All state-of-the-art knowledge regarding vertical flow constructed wetlands gathered in one book A review of various constructed wetland approaches, including information about applications and performance, helps clarify what is currently known about constructed wetland principles and design Discussion of how to manage the treated wastewater leaving the vertical flow for increasing biodiversity, providing food and habitat for birds, and producing harvestable biomass or crops Includes case studies of constructed wetlands in developing countries
On Site Wastewater Treatment
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Author : American Society of Agricultural Engineers
language : en
Publisher:
Release Date : 1994
On Site Wastewater Treatment written by American Society of Agricultural Engineers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Nature categories.
Treatment Wetlands
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Author : Gabriela Dotro
language : en
Publisher: IWA Publishing
Release Date : 2017-11-15
Treatment Wetlands written by Gabriela Dotro and has been published by IWA Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-11-15 with Science categories.
Contents: Overview of Treatment Wetlands; Fundamentals of Treatment Wetlands; Horizontal Flow Wetlands; Vertical Flow Wetlands; French Vertical Flow Wetlands; Intensified and Modified Wetlands; Free Water Surface Wetlands; Other Applications; Additional Aspects.
Treatment Wetlands
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Author : Robert H. Kadlec
language : en
Publisher: CRC Press
Release Date : 2008-07-22
Treatment Wetlands written by Robert H. Kadlec and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-07-22 with Nature categories.
Completely revised and updated, Treatment Wetlands, Second Edition is still the most comprehensive resource available for the planning, design, and operation of wetland treatment systems. The book addresses the design, construction, and operation of wetlands for water pollution control. It presents the best current procedures for sizing these syste
The Role Of Constructed Wetlands And Other Alternative Technologies In Meeting The Wastewater Treatment Needs Of Rural And Small Communities
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Author : United States. Congress. House. Committee on Public Works and Transportation. Subcommittee on Investigations and Oversight
language : en
Publisher:
Release Date : 1993
The Role Of Constructed Wetlands And Other Alternative Technologies In Meeting The Wastewater Treatment Needs Of Rural And Small Communities written by United States. Congress. House. Committee on Public Works and Transportation. Subcommittee on Investigations and Oversight and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Nature categories.
