BIOSTYR Wastewater
BIOSTYR Mastering advanced technology Veolia Water Solutions & Technologies has more than 20 years experience of supplying and operation BAFF (Biological Activated Flooded Filter) processes in the municipal wastewater and industrial markets. From this extensive experience we are able to offer our BIOSTYR process for applications ranging from carbonaceous removal to post-denitrification. Highly compact, BIOSTYR combines in a single structure the biodegradation of carbonaceous and nitrogenous pollution (nitrification - denitrification) and the clarification of effluent by filtration through a media bed that acts as an environment for biological activity. BIOSTYR the advanced solution designed to meet the most stringent discharge quality standards for organic and/or nitrogen removal. Nozzle floor Stored treated water Outlet treated water Inlet Process air and wash cycle scour air BIOSTYR cell Filter media (BIOSTYRENE ) Dirty wash discharge Upflow of influent and air Insert Air grid Floor Nozzle BIOSTYR Standard Modular Design Veolia Water Solutions & Technologies' expertise in the design, manufacture, installation and maintenance of the BIOSTYR system on almost one hundred sites throughout the world enables it to offer the following: Standard parts for the BIOSTYR cell (nozzles, air grid, filter media, floor, insert) whatever the application A standard range of BIOSTYR filters, from 2 to 230 m² Small sizes are available as package stainless steel units.
The process A biological treatment Carbonaceous and nitrogenous wastes are degraded by active biomass, which develops on a submerged media called BIOSTYRENE. The oxygen required for the biological reaction is provided by an upflow of process air, injected co-currently to the water supply. Depending on the application, air may be blown in at the base of the reactor (a fully aerated zone) or into the media (two zones: one aerated, one anoxic). combined with upflow filtration The retention of suspended solids and excess biomass is carried out by the filtration of the flow through the BIOSTYRENE bed. This low-density media composed of expanded polystyrene beads is submerged and retained by a nozzle floor. In general, the higher the level of discharge the smaller the grain size of the material. For high quality discharge The nozzles allow the treated water to enter a common water reservoir above the filters. Part of this water is used for regular, counter-current washing, which eliminates excess biological matter and suspended solids retained in the filter bed. The washing efficiency is optimised by a cyclic air injection sequence. Nozzle floor The dirty wash water can then be returned and treated in the primary settlement tanks of the works or in a specific treatment process.
Solutions adapted to your requirements BIOSTYR for the elimination of carbon alone The elimination of biodegradable carbonaceous pollution and suspended solids is carried out in a fully aerated BIOSTYR cell. Montpellier, France (2003) Carbon removal after high-load activated sludge. 8 cells, 173 m² each 200 000 PE BIOSTYR for nitrification This configuration, the design of which is similar to that for carbon removal, is used to eliminate ammonia, biodegradable carbonaceous pollution and suspended solids, in a single step, within the same fully aerated BIOSTYR cell. Neuchâtel, Switzerland (1997) Carbon removal after primary settling. 6 cells, 42 m² each 42 000 PE For secondary treatment, after simple clarification, physical-chemical clarification or high-load activated sludge: ammonia nitrogen and carbonaceous pollution are eliminated at the same time. Geneva, Switzerland (2001) - 600 000 PE Secondary nitrification after physical-chemical settling. 20 cells, 173 m² each Cergy-Pontoise, France (1992) Secondary nitrification after activated sludge. 16 cells, 63 m² each 200 000 PE For tertiary treatment, after medium-load activated sludge, biofilter or trickling filter: Most additional polishing of suspended solids and residual carbon. Davyhulme, England (1998) - 1 500 000 PE Tertiary nitrification after activated sludge. 36 cells, 113 m² each Shepton Mallet, England (2002) Tertiary nitrification after trickling filter. 5 cells, 12 m² each 62 000 PE Scope for BIOSTYR applications Carbon removal Nitrification Nitrification/denitrification Post-denitrification
BIOSTYR for nitrification/denitrification For secondary treatment, after simple clarification or physical-chemical treatment; carbon removal, nitrification and denitrification are carried out in the same cell. The process requires a recirculation loop of the treated water to return the nitrates. Two configurations are possible: Herford, Germany (1997) - 250 000 PE Nitrification/denitrification after physical-chemical settling. 4 cells, 63 m² each Songdo, Korea (2004) - 33 000 PE Simultaneous nitrification/denitrification after physical-chemical settling. 4 cells, 63 m² each BIOSTYR with two separate aerated and non-aerated zones: The nitrate produced by the nitrification process in the aerated zone is recycled and converted into gaseous nitrogen in the anoxic zone, using clarified water as carbon source required for the reaction. Fully aerated BIOSTYR : Thanks to the close monitoring of the dissolved oxygen in the system and fine control of the process air supplied, aerated/non aerated micro-zones are created around the beads. The nitrification and denitrification processes operate simultaneously on each bead. This configuration has the advantage of reducing the recycle rates by about 25%. Hobro, Denmark (1994) Nitrification/denitrification after physical-chemical settling. 6 cells, 28 m² each 75 000 PE Luneville, France (2002) Simultaneous nitrification/denitrification after physical-chemical settling 4 cells, 63 m² each. 50 000 PE BIOSTYR for post-denitrification For final treatment, after activated sludge, a nitrifying or nitrifying/denitrifying biofilter: Post-denitrification is carried out in a non aerated medium at the end of treatment, when the elimination of nitrogen during the previous stage is inadequate to meet the overall level of nitrogen required. The denitrification process is used, by adding an external carbon source (methanol), to transform the excess residual into gaseous nitrogen, with a very high denitrification yield. Douarnenez, France (2003) Post-denitrification after nitrification/denitrification. 5 + 1 cells, 63 + 28 m² each 80 000 PE Saint-Thibault-des-Vignes, France (2000) Post-denitrification after nitrification/denitrification. 8+7 cells, 84 m² each 350 000 PE
A whole host of advantages Advanced biological treatment The possibility of eliminating carbon and nitrogen within the same cell, High concentration of biomass on the media, Proven efficiency during high variations of load and flow rate. Highly efficient filtration No final clarification is needed, Excellent capture of suspended solids due to filtration in a direction which compacts the media rather than expanding it, Filtration rate between 6 and 30 m/h, depending on application, Automated biofilter control system (REGUL-FILTRE ). Fewer nuisances Ambient air only in contact with the treated water, Used wash water, which is collected at the bottom of the biofilters, is not exposed to the atmosphere. An intelligent, compact design Floating media in conjunction with an upflow system, Easy access for nozzles maintenance with no need to empty the media, Protection of components sensitive to clogging (nozzles in contact with treated water), Wash water reservoir in the top of the filters without a separate storage tank, Modular design of the aeration grid, depending on application. High quality material for the BIOSTYRENE beads Synthetic and light, Spherical and regular, Resistant to abrasion, From to 3 to 5 mm in diameter depending on the purpose of treatment, High specific surface for biomass adhesion, Size and density adaptable to objectives. Cost-effective and easy to maintain Counter-current washing with the treated water, Washing by "gravity flushing" which does not require a pump, Sequenced air injection, Automated washing. L'Aquarène 1 Place Montgolfier 94417 Saint - Maurice Cedex - FRANCE Phone : +33 (0)1 45 11 55 55 Fax : +33 (0)1 45 11 55 00 www.veoliawaterst.com Graphic design : ILSE Communication - May 2007