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Environmental sciences, Civil engineering
This paper will briefly trace the development of reed beds, the treatment mechanisms involved and the evolution of the more popular designs, with emphasis on the hybrid reed bed. It will also present a review of the concept of using willow beds to deal with waste water. It will examine the Danish guidelines. It will also review the application of willows to treat effluent from a hybrid reed bed system and the evolution of this system in Wales. The theory of willow bed treatment will also be discussed with particular emphasis on the factors that effect evapotranspiration. Two alternative designs for a willow soakaway will also be presented. The concept of a reed willow bed combination to treat municipal and domestic wastewater has been tested by the School Civil and Building Services Department of Dublin Institute of Technology, for the past number of years. Two sites have been tested in this eight year period, with promising results in the first. Based on this design a second installation was commissioned. This paper will present a case study of the first hybrid reed bed and willow bed system installed in Colecott, Co. Dublin, under the auspices of Fingal Co. Council. It will present design criteria. A brief discussion of the two year monitoring programme will be presented. The case study will also include a critique of the system and its operation. The paper will then describe the second reed and willow bed installation at Lynche’s Lane, Co. Dublin under the auspices of South Dublin Co. Council. The results of the two year study to monitor the performance of the reed willow bed facility at Lynches Lane, Co. Dublin, Ireland, will be presented. The zero discharge achieved over the 24 month period will be reviewed. The application of this system to the Irish situation will be discussed. The Danish experience with the production of their Willow guidelines and the need for no monitoring will be compared with the position Ireland now finds itself in as a result of the recent EU judgment
O'Hogain, S., McCarton, L.: The operation of hybrid reed bed and willow bed combinations in Ireland - zero discharge and the potential for no monitoring of domestic applications of this combination. Proceedings 2nd Irish International Conference on Constructed Wetlands for Wastewater Treatment and Environmental Pollution Control. UCD, Dublin. October 2010.