Journal ArticleDOI
Cold climate performance analysis of on-site domestic wastewater treatment systems.
TLDR
The data suggested that effluent temperature within the sample range had almost no effect on effluent concentrations of BOD5 or TSS and only a small effect on the removal of total nitrogen.Abstract:
Household on-site septic systems with secondary wastewater treatment in Anchorage, Alaska, were sampled and analyzed for performance parameters during the winter to spring months. System types included intermittent dosing sand filters (ISF), three types of recirculating trickling filters (RTF), and suspended-growth aeration tanks. Total nitrogen from the trickling filter and aeration tank effluent was fairly uniform, at approximately 30 mg/L. Total suspended solids (TSS) means were mostly less than 15 mg/L. The 5-day biochemical oxygen demand (BOD 5 ) showed considerable variability, with means ranging from 9.2 mg/ L for ISFs up to 39.5 mg/L for one type of RTF, even though this type has shown excellent results in several test programs. The data suggested that effluent temperature within the sample range had almost no effect on effluent concentrations of BOD 5 or TSS and only a small effect on the removal of total nitrogen. Non-climatic factors were probably of equal importance to treatment results.read more
Citations
More filters
Journal ArticleDOI
Sand filters for removal of microbes and nutrients from wastewater during a one-year pilot study in a cold temperate climate
Ari Kauppinen,Kati Martikainen,Ville Matikka,Anna-Maria Veijalainen,Tarja Pitkänen,Helvi Heinonen-Tanski,Ilkka T. Miettinen +6 more
TL;DR: The remarkable differences noted between the studied SFs highlights the importance of construction materials and the careful planning of the filters, and seasonal conditions appear to have a clear effect on purification efficiencies, emphasising the vulnerability of these systems especially in cold climates.
Journal ArticleDOI
Response of greenhouse gas emissions and microbial community dynamics to temperature variation during partial nitrification.
TL;DR: During partial nitrification, the microbial community diversity greatly declined compared with seed sludge, however, the diversity was enhanced at low temperature, and the abundance of Betaproteobacteria at class level increased greatly duringpartial nitrification.
Journal ArticleDOI
Variation of dissolved oxygen and redox potential and their correlation with microbial population along a novel horizontal subsurface flow wetland
TL;DR: The unique DO distribution in HSFW may contribute to an optimum environment for partial nitrification and anammox, and obtain a high performance for nitrogen removal.
Journal ArticleDOI
Removal of acidic pharmaceuticals within a nitrifying recirculating biofilter.
TL;DR: It is indicated that RBFs as a nitrifying stage of a multi-stage filtration process could be a viable technology for removal of some acidic pharmaceuticals in small onsite wastewater treatment facilities.
Dissertation
Assessment of contaminant concentrations and transport pathways in rural Alaska communities' solid waste and wastewater sites
TL;DR: In this paper, the impact of waste sites on soil, surface, and subsurface waters in the vicinity of the sites was evaluated by evaluating contaminant prevalence and diversity, quantifying contaminant concentration levels, and evaluating their potential migration into nearby freshwater systems.
References
More filters
Book
Wastewater engineering : treatment and reuse
TL;DR: In this article, the authors present an overview of wastewater engineering and its application in the field of wastewater treatment, including conversion factors, physical properties of selected gases and the composition of air, and water properties.
Journal ArticleDOI
Effects of Watershed Land use on Nitrogen Concentrations and δ15 Nitrogen in Groundwater
Marci L. Cole,Marci L. Cole,Kevin D. Kroeger,Kevin D. Kroeger,James W. McClelland,Ivan Valiela +5 more
TL;DR: In this article, the authors measured nitrogen concentrations and δ15N values in seepage water entering three freshwater ponds and six estuaries on Cape Cod, Massachusetts and assessed how they varied with different types of land use.
Journal ArticleDOI
Technology Assessment of Wastewater Treatment by Soil Infiltration Systems
TL;DR: In this article, an integrated approach for assessment of the hydraulic loading rate based on soil type and wastewater quality is suggested, but rational criteria for selection of optimal geometry is lacking, while trench design should be preferred over beds.
Journal ArticleDOI
Nitrogen Removal in Recirculating Sand Filter Systems with Upflow Anaerobic Components
TL;DR: Evaluated recirculating sand filter-upflow anaerobic systems used to treat septic tank effluent from a correctional institution and produced a treated wastewater with a total nitrogen concentration of 15.2 mg∕L, showing differences between the two systems appear to have been the result of process configuration changes made over the duration of the study.
Nitrogen Removal Efficiencies of Three Alternative Septic System Technolo- gies and a Conventional Septic System a
Joseph E. Costa,George R. Heufelder,Sean Foss,Newton P. Milham,Brian L. Howes,Cranberry Highway +5 more
Abstract: At a septic system testing center, conventional design onsite wastewater disposal (“Title 5”) systems, were found to have a net nitrogen removal capability of 21-25% when data from the base of the Soil Absorption System (SAS) was considered, after accounting for an assumed precipitation recharge dilution of 10%. This reduction occurs principally in the soil absorption system, a component that is often overlooked in comparative studies. Nitrogen losses in the septic tank ranged from 1% to 3%. Successful proprietary nitrogen removal systems tested like the Waterloo Biofilter trickling filter and MicroFAST Model 0.5 systems had a net nitrogen removal capability of 60% and 55% respectively, thus discharging slightly more than half the nitrogen discharged by a conventional system. In these technologies, most nitrogen reduction occurred prior to discharge to the SAS. The recirculating sand filter (RSF) designs tested removed approximately 41% of influent nitrogen, but we did not examine SAS losses, and overall system performance may be slightly better than this with a SAS installed. Without the SAS, the RSFs tested discharged 25% less nitrogen to groundwater than the Title 5 systems. Conventional septic systems with a Geoflow Wasteflow Drip Line system in the SAS removed 42% of influent nitrogen overall, showing that the performance of a SAS can be improved by injecting discharge near the topsoil, to allow nitrogen uptake by grass and other vegetation. This Drip Line design, combined with another septic tank technology could result in very high overall system nitrogen removal rates. One experimental design (ECORUCK) had a nitrogen removal ability less than a conventional system and was withdrawn after one year of testing.