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Showing 1 to 20 of 31 for “"biofilters"”.
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Freshwater Mussels as Biofilters
… of freshwater mussels as living filters, or “biofilters”, in a variety of settings. Initial measurements of the filtration rates of British freshwater mussels showed that individual mussels can filter up to half a litre of water per hour. Calculations of the filtration rates of mussel …
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Microbial community analysis for denitrifying biofilters
Denitrifying biofilters are a promising and low-maintenance technology for removing nitrate from agricultural drainage, capable of removing 50-80% of annual nitrate loads. Because increased riverine nitrate concentrations are correlated with indicators of eutrophy and degradation of coastal waters, …
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Microbial community dynamics in denitrifying biofilters receiving agricultural drainage
… of operational parameters, denitrifying biofilters still perform somewhat unpredictably. Therefore, in this work we sought to understand how environmental and management factors affect the microbial communities responsible for biofilter functional. To do so, we employed two different …
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Comparison of Biofilm Media in Reciprocating Biofilters Treating Dairy Flushwater
<p>Reciprocating biofilters known as ReCip is a viable technology to manage nutrients, mainly nitrogen, problems at livestock operations such as swine farms and dairies. Past studies have demonstrated that ReCip is more adept at total nitrogen (TN) removal than traditional subsurface flow wetland …
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Impedance-based moisture content sensor assessment for gas-phase biofilters
… to monitor the moisture content of gas-phase biofilters. A sensor consisting of a sensing unit (three parallel plates) and a circuit generating DC voltage outputs was used in this study to measure moisture content. The sensor readings changed with step-wise increase of moisture content as well …
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Fate of virus during wastewater renovation in soil porous media biofilters
Includes bibliographical references.
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Approaches to modeling pathogen and natural organic matter removals in slow-rate biofilters
… sustainable water treatment systems: slow-rate biofilters. This research addresses the problem by deriving semi-empirical models that predict pathogen and natural organic matter removals within these natural and engineered sand filters. The more complex pathogen model, or phenomenological …
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Temperature impact on nitrification and bacterial growth kinetics in acclimating recirculating aquaculture systems biofilters
… observed results. The performance of the biofilters was determined with three tank replicates at fixed temperatures of 13, 20 and 300C; and at diurnal transient (sinusoidal) temperature regimes of (20 ± 30C; 30 ± 30C). Ammonia utilization rates and biofilter performance for beads …
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Performance, denitrification activity, and microbial community dynamics of denitrifying biofilters under fluctuating water level
… causing water quality degradation. Denitrifying biofilters have been identified as a technology that reduces the export of nitrate from tile-drained fields. A better understanding of the microbial communities that allow the biofilter to function may provide insight to improve performance. Two …
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An investigation into the performance of vegetated biofilters in removing nutrients from stormwater in the City of Cape Town, South Africa
In 2009, the City of Cape Town (CoCT) adopted a stormwater policy which mandates that new and existing developments should reduce the concentrations of phosphorus and suspended solids in stormwater runoff by 45% and 80% respectively, but offered no explicit guidance about how these water quality …
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Microorganisms and Functional Genes Associated with Cometabolic Degradation of 1,4-Dioxane in Biologically-Active Carbon Biofilters Applied for Potable Reuse Treatment
1,4-dioxane is a probable human carcinogen frequently found in water and wastewater systems at concentrations above the EPA one-in-one-million cancer risk level of 0.35 ug/L. 1,4-dioxane is not well removed through conventional treatment methods due to its polarity and resistance to biodegradation, …
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Development and application of a microbial reliability model to analyze denitrifying biofilter stability
… method is the use of edge-of-field denitrifying biofilters. These biofilters redirect tile drainage flow through a woodchip bed, where microbial activity converts influent nitrate to nitrogen gases. As with many engineered ecosystems, performance stability of the biofilters is of concern. While …
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Gas-phase biofiltration for livestock building ammonia emission mitigation
… certain livestock building ammonia emissions. Biofilters are bio-reactors that can absorb ammonia and then oxidize it into nitrite and nitrate using microorganisms. Woodchips and composts are often used as packing materials thus making it an affordable method. It was originally developed in …
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An analysis of nature-based treatment processes for cleaning contaminated surface water runoff from an informal settlement: a case study of the Stiebeuel River catchment, Franschhoek, South Africa
… and environmental health. Biofiltration systems (biofilters) provide water pollution controls without inputs of additional energy and chemicals, placing them in the overall context of the need for affordable and sustainable stormwater infrastructure in informal settlements. In addition, cleaned …
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Evaluating the use of manganese-oxidizing bacteria in surface water treatment plants
… has not been demonstrated. Laboratory-scale biofilters were operated to evaluate the ability of MOB to accomplish soluble Mn control at a range of pH (6.3--7.3). The biofilters were able to oxidize Mn at a pH as low as 6.3 at greater than 98% removal. Ozonation by-product removal was also …
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Biofiltration of volatile organic compounds using fungal-based bioreactors
… washing affected pollutant removal in fungal biofilters. In experiments to evaluate the influence of nitrogen supply on bioreactor performance, it was determined that a nitrogen mass loading of approximately 2% of the carbon mass loading was needed to achieve near-complete removal of the …
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Assessment of integrated green infrastructure-based stormwater controls in small to large scale developed urban watersheds
… City, MO with various GI practices including biofilters, curb extension biofilters, cascade biofilters, porous pavement, rain gardens monitored at small scales (individual GI performance) and monitored at large scales (overall integrated GI performance and their impact on combined sewer …
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Assessing Biofiltration without Ozonation for Removal of Trihalomethane Precursors in Drinking Water at the Beaver Water District Drinking Water Treatment Plant
… chlorine dioxide dose were added prior to the biofilters to increase the amount of biodegradable NOM. Relative to the RSSCTs, the Pilot filters achieved higher average removals of DOC, SUVA254, TTHMFP and DCANFP because their GAC media was not exhausted with respect to DOC and thus NOM was …
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Biofiltración de compuestos orgánicos volátiles utilizando diferentes tipos de lecho basados en mezclas de compost de RSU-poda: monitorización mediante diversas técnicas
… and the abatement of VOCs by different compost biofilters was studied. VOCs removal efficiencies greater than 90% were obtained using composts of municipal solid waste (MSW) or MSW-pruning residue as biofilter material. An electronic nose identified qualitative differences among the biofilter …
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