Journal ArticleDOI
Evaluation of On-Site Waste Disposal System for Nitrogen Reduction
Richard J. Piluk,Oliver J. Hao +1 more
TLDR
In this article, the authors designed and monitored an experimental on-site watewater disposal system with nitrogen-reducing capability, which incorporated two fixed-film reactors: a nitrification/denitrification (N/D) tank, and a polishing filter.Abstract:
One of the enironmental concerns associated with on‐site wastewater disposal is nitrate contamination of groundwater. The purpose of this study was to design and monitor an experimental on‐site watewater disposal system with nitrogen‐reducing capability. Incorporated into the system are two fixed‐film reactors: a nitrification/denitrification (N/D) tank, and a polishing filter. Recirculated denitrified effluent sprayed onto the sand filter portion of the N/D tank is nitrified and the nitrified effluent is then mixed with septic tank effluent in the submerged gravel section for denitrification. The remaining portion of the denitrified effluent enters a polishing filter before final discharge into groundwater. With a recirculation ratio of 3.3, the overall reduction in total nitrogen through the N/D tank was approximately 70%. The N/D component of the system also achieved a reduction in BOD, COD, and suspended solids of 87, 80, and 84%, respectively. With the polishing filter, further enhanced removal of th...read more
Citations
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Journal ArticleDOI
Nitrogen loading from coastal watersheds to receiving estuaries: new method and application
Ivan Valiela,G. Collins,James N. Kremer,Kate Lajtha,M. Geist,Brad Seely,J. Brawley,Chi-Ho Sham +7 more
TL;DR: In this paper, the authors developed a model to estimate nitrogen loading to watersheds and receiving waters, and then applied the model to gain insight about sources, losses, and transport of nitrogen in groundwater moving through a coastal watershed.
Journal ArticleDOI
In Situ Denitrification of Septic‐System Nitrate Using Reactive Porous Media Barriers: Field Trials
TL;DR: In this paper, a new alternative septic-system design is presented utilizing reactive porous media barriers for passive in situ attenuation of NO3−, which consists of solid organic carbon (sawdust) which promotes NO3- attenuation by heterotrophic denitrification.
Journal ArticleDOI
Organic carbon removal and nitrification of high strength wastewaters using stratified sand filters
TL;DR: Intermittent stratified sand filters appear to offer an effective and sustainable treatment process for the removal of BOD from high-strength wastewaters, and for the complete nitrification of ammonium.
Journal ArticleDOI
Performance of a stratified sand filter in removal of chemical oxygen demand, total suspended solids and ammonia nitrogen from high-strength wastewaters.
TL;DR: The proportional surface area requirement for the sand filter described in this study is less than the recommended surface area requirements of a free-water surface (FWS) wetland treating an effluent of similar quality, it could provide an economic and sustainable alternative to conventional wetland treatment.
Journal ArticleDOI
Nitrogen removal in laboratory model leachfields with organic-rich layers.
TL;DR: Results indicate that addition of a layer of carbon source material at least 0.3 m thick below a standard leachfield substantially improves total N removal, and design modifications targeted at improving nitrification above the organic layer may further increase totalN removal.
References
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Book
Standard methods for the examination of water and wastewater
TL;DR: The most widely read reference in the water industry, Water Industry Reference as discussed by the authors, is a comprehensive reference tool for water analysis methods that covers all aspects of USEPA-approved water analysis.
Book
Biological process design for wastewater treatment
TL;DR: Biological process design for wastewater treatment, Biological Process Design for Watershed Treatment (BPT) as mentioned in this paper, Biological Process design for Water Treatment (BPWPT), Biological Process for WET
Journal ArticleDOI
International standards for drinking water
TL;DR: In this article, a comparison of lois, normes, conseils politiques appliques, and normes emanant de l'Organisation Mondiale de la Sante (OMS) is presented.