bed filter Articles

  • Filter bed remediation - Case Study

    Biological filter beds usually consist of a mineral media over which effluent to be treated percolates. The media becomes host to a biomass which is grazed by a series of more complex organisms. If the growth of the biomass is greater than the rate at which the grazing occurs then the biomass film will accumulate in the bed. This will block the interstices of the media and restrict effluent ...


    By Greener Waste Technology

  • Lauvåsen wastewater treatment in filter beds Norway

    Lauvåsen is a cluster of houses, holiday homes and a tourist resort in Sør-Fron municipal in Norway. 25 holiday homes, 3 houses and one tourist resort are connected to the treatment plant. This gives a dimensioning flow of: Qdim = 63 m3/day, a total of 284 pe. The treatment plant was built in 2002. Filter media used in this plant:  930 m3   Filtralite® P 0-4 mm270 ...


    By Filtralite - Leca Norge As

  • Bed expansion affects performance

    The experience of Pennsylvania Department of Environmental Protection staff over 14 years conducting filter plant performance evaluations led investigators to identify a coomon thread:'inadequate filter bed expansion eventually contributes to poor filter performance and reduced finished water quality.' The article points our that and insufficiently expanded filter is insufficiently cleaned, and ...


    By Entech Design, Inc.

  • Remediation of a failing filter bed Works - Case Study

    Greener Waste Technology is a Process Engineering and Environmental Consultancy specialising in the Municipal sector. Following several years of extensive research Greener Waste Technology has advanced the unique bacteria dosing technology which has been successfully introduced to a number of water companies. The BioCube is being successfully used in wastewater treatment to optimise processes ...


    By Greener Waste Technology

  • Case study - Upper Uvdal wastewater treatment plant - Filter bed

    The plant is designed as a traditional chemical and biological treatment plant, as a polishing step the effluent is going thru a filter bed with Filtralite before it is discharged into a small creek. The filter bed treatment plant is built with Filtralite P in Nore and Uvdal municipal in Norway. Uvdal ski resort, some houses and several hundred holiday homes are connected to the treatment plant. ...


    By Filtralite - Leca Norge As

  • Residence time and contact volume in sloped compost and compost/vegetated filter beds

    Little is known about transport mechanisms in sloped dormant vegetated and compost only filters for roadway runoff. Residence time experiments were carried out in triplicate in 0.254 m wide × 0.65 m long by 0.10 m deep beds using a bromide tracer. Bed slope was 12°. Only at the lowest flow rate tested (0.276 l/min per m of filter width) were mean residence times in compost beds with and without ...


    By IWA Publishing

  • The application of moving bed biofilm reactor to denitrification process after trickling filters

    The paper presents research of a prototype moving bed biofilm reactor (MBBR). The device was used for the post-denitrification process and was installed at the end of a technological system consisting of a septic tank and two trickling filters. The concentrations of suspended biomass and biomass attached on the EvU Perl moving bed surface were determined. The impact of the external organic ...


    By IWA Publishing

  • Sludge drying beds, Sarasota County, Florida - Case Study

    Dewatering sludge at wastewater treatment plants has traditionally been a major operational concern. Most large operations must use mechanical filter presses or centrifuges to efficiently dewater their sludge. For many smaller operations, however, this equipment is too expensive and too large for their needs. Therefore, many smaller facilities rely on the sand filter drying beds for sludge ...


    By Presto Geosystems

  • Combination filters

    Simply defined, a combination filter is one that does at least one other processing job at the same time as filtering a suspension. The classic example, of course, is the packed bed of activated charcoal, which acts as a remover of chemical impurities from the suspension, as well as removing dust particles - although this is actually not a very good example, because it is primarily an adsorber, ...

  • Saturated and unsaturated flow through sloped compost filter beds of different particle sizes

    Little is known about the hydraulics of sloped compost beds having active free and non-flowing zones, and used for runoff erosion and volume control, and heavy metal removal. Water sorption tests on yard waste compost indicated that water transfer between the two zones would be slow (6 hr for a 0.04 m rise). The free flowing zone in ≈1 m long sloped (15°) beds increased in depth ...


    By IWA Publishing

  • Bio-augmentation of fixed film filters

    Once regarded as the main process option for the waste water treatment for small communities, circular biological filters, so common on the outskirts of towns for many years, provided a reliable low cost and low profile method of treating household waste water. Quiet and robust, their simple engineering and structural design could be easily maintained by a daily visit from an operator, who, on ...


    By Greener Waste Technology

  • Particle deposition and mobilisation during deep bed filtration in oilfields

    Deposition of latex microspheres on a borosilicate filter was carried out at gradually decreasing suspension velocities at conditions favourable for particle attachment and excluding particle retention due to size exclusion. Particle critical retention concentration followed quadratic function of suspension velocity agreeing with the modified particle attachment/detachment model based on ...


    By Inderscience Publishers

  • Simulating accumulation of biofilms in biotrickling filter

    Accumulations and spatial and dynamic variations of biofilms in the media of a biotrickling filter were simulated using mathematical models for Volatile Organic Compound (VOC) removal. Toluene was selected as the model VOC. Effects of toluene concentration and gas Empty Bed Contact Time (EBCT) on VOC removal were also investigated. Results showed that biofilm thickness increased with increased ...


    By Inderscience Publishers

  • Effect of filter media thickness on the performance of sand drying beds used for faecal sludge management

    The effect of sand filter media thickness on the performance of faecal sludge (FS) drying beds was determined in terms of: dewatering time, contaminant load removal efficiency, solids generation rate, nutrient content and helminth eggs viability in the dried sludge. A mixture of ventilated improved pit latrine sludge and septage in the ratio 1:2 was dewatered using three pilot-scale sludge ...


    By IWA Publishing

  • Back-propagation neural network for performance prediction in trickling bed air biofilter

    Experimental studies were carried out with a laboratory-scale biotrickling filter to treat a gaseous stream contaminated with benzene, toluene and xylene (BTX) operated in a continuous mode. The biotrickling filter initially acclimatised with toluene was used to treat BTX compound individually at loading rates ranging from 7.2 g/m³hr to 62.2 g/m³hr, operated in a sequential mode. The results ...


    By Inderscience Publishers

  • A real-life test bed for multi-agent monitoring of road network performance

    This paper describes an approach to road network monitoring. The approach has the following main components: a multi-agent hierarchical monitoring system in which the agents are network elements such as crossings, road segments and routes, software engineering techniques to handle legacy sensors and to homogenise their heterogeneous data streams, distributed Kalman filtering to reduce sensor ...


    By Inderscience Publishers

  • Filter refurbishment program for Southern Water in Eastrey

    Peak flow to treatment: PE of site: 2090 (550 m3/day) Formula A site Units supplied: 2 off steel 500 pe units (Rental units) Purpose of rental units: To allow for the refurbishment of trickling filter beds, initially the SAF units were used for both carbonaceous treatment and ammonia removal. Once the trickling filter beds were ...


    By WPL Ltd

  • Nitrogen removal in micro-polluted surface water by the combined process of bio-filter and ecological gravel bed

    Nitrogen removal in micro-polluted surface water by the combined process of a bio-filter and an ecological gravel bed was studied. Sodium acetate was added into micro-polluted surface water as carbon source and the nitrogen removal under different C/N ratio, hydraulic load and temperature were investigated. The results showed that the variations in C/N ratio, hydraulic load and temperature have ...


    By IWA Publishing

  • Evaluation of a hybrid upflow anaerobic sludge-filter bed reactor: effect of the proportion of packing medium on performance

    The aim of this study was to determine the effects of the volume occupied by the filter bed zone on the behavior of an anaerobic hybrid UASFB reactor. This configuration contains a sludge bed in the lower part of the reactor and a filter bed in the upper part. Three such reactors, each with a working volume of 9.8-L, were studied; these differed in proportion of packing medium occupying 50, 35 ...


    By IWA Publishing

  • Laboratory analysis of the hydrogeological behaviour of rock loose structures on pervious beds

    Large flow interchanges occur between free surface and subsurface flows of river training structures, such as in rock loose chutes based on pervious beds. The filtering action of the base pervious layer can improve the water quality but, at the mean time, reduce the minimum vital flow discharge. This paper, hence, aims to analyse the flow interchanges between the base material and the surface ...


    By Inderscience Publishers

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