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- Renman, Gunno, et al.
(author)
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Reactive bed filters for treatment of storm water from roads and motorways
- 2004
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In: International Scientific-Technical Conference. Surface water, underground water and soils protection along roads and motorways. - : Eurosystem. - 839194994X ; , s. 109-113
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Conference paper (other academic/artistic)abstract
- A reactive bed filter is designed according to the purpose of treatment, e.g. for storm water from roads. The construction may be a filter well or a constructed wetland where the most important component is the reactive medium or sorbent. Different types of artificial adsorbents or ion exchange materials are available as commercial products and most of them are utilized when very high treated water standards are required. A filter technology using reactive media has been developed at the Royal Institute of Technology (KTH), where separate filter wells were constructed as a step following the storm water pond. Besides the filter construction, the most important part is the medium or sorbent used. The sorbent is ‘reactive’ for one or several contaminants that have to be removed from the storm water. The term sorbent refers not only to adsorption, but also to processes such as precipitation, ion exchange, complexation and mechanical filtration. Sorption depends heavily on conditions such as pH, concentration of pollutants, ligand concentration, competing ions and particle size. Sorbents may consist of natural materials that are available in large quantities and at a low cost, or of by-products from industrial or agricultural operations. Since they are non-expensive, these materials can be disposed of without expensive regeneration, although one must bear in mind that they can contain hazardous substances after use and have to be treated accordingly. A promising reactive media is Polonite® which has been developed from the bedrock opoka. The paper presents different technical solutions for treating polluted water from traffic areas.
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| 2. |
- Renman, Gunno, et al.
(author)
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Treatment of road run-off water in Sweden : Problems and possibilities
- 2004
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In: International Scientific-Technical Conference. Surface water, underground water and soils protection along roads and motorways. - : Eurosystem. - 839194994X ; , s. 55-60
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Conference paper (other academic/artistic)abstract
- The conditions for handling of run-off water differs notably compared to the handling of potable water, sewage water and industrial effluent water. For conventional water treatment the time variations of flow and quality of the contaminated waters is well established and known. The legal aspects for conventional water production and treatment are clearly defined and not ambiguous. This is not the case for handling and treatment of run-off water. In the EU directive 1991/271/EEC run-off water is defined as sewage water. The EU Water Directive refers to 1991/271/EEC and points to run-off water as a pollutant source for ground water. Elevated levels of pollutant can be found in run-off water from catchment areas with dense traffic loads. Depending on road maintenance, use of studded tires, type of pavement, traffic load, velocity, type of vehicle, residential and industrial areas, tunnels the degree of mobility of the pollutants will vary in the ambient air and the run-off water. An aspect that only to some extent has been elaborated on is the influence of pavement types and its wear in regards to the mobility of the pollutants. A treatment technique commonly used in Sweden is storm water ponds. The pollutant removal efficiency varies for different ponds, due to different specific pond areas, i.e. pond area in relation to catchment area. Ponds act as sedimentation basins, collecting particles and bounded pollutants. However, the solute transport of e.g. heavy metals should be trapped by other means. A filtration unit has been developed and tested in Sweden.
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