Wetland Systems for Water Pollution Control 1996

About this book

For about 40 years wetlands have been constructed to replicate the complex biological systems of natural wetlands. In the last decade, however, interest in this technology has boomed, and several thousand constructed wetlands are in use around the world. Much progress has also been made in understanding and optimizing the mechanisms by which wetlands can ameliorate pollution. Nevertheless further research is necessary and differing views are held on the best applications of wetlands. Hence, 215 delegates from 47 countries assembled in Vienna to share their expertize and experiences, to bring answers to the different questions and to coordinate further research programmes. These proceedings present 43 papers covering research into fundamental biological and physicochemical processes, engineering design and system performance, ecological aspects, and case studies.

Contents

Fundamentals. Biogeochemical indicators to evaluate pollutant removal efficiency in constructed wetlands (K.R. Reddy, E.M. D'Angelo). Implementation of constructed wetlands in developing countries (P. Denny). Processes. A thermal analysis of a sub-surface, vertical flow constructed wetland. (I.D. Smith et al. ). N- and COD-removal in vertical-flow systems (K. Von Felde, S. Kunst). Phosphorus sorption and chemical characteristics of lightweight aggregates (LWA) - potential filter media in treatment wetlands. (T. Zhu et al. ). An assessment of metal removal by a laboratory scale wetland (A.S. Mungur et al. ). Role of Plants. Nutrient content of wetland plants in constructed wetlands receiving municipal effluent in tropical Australia (M. Greenway). Design. Deterministic and stochastic aspects of constructed wetland performance and design (R.H. Kadlec). The performance of vertical flow experimental wetland under a range of operational formats and environmental conditions (P.F. Breen). Hydraulics. Soil clogging in vertical flow reed beds - mechanisms, parameters, consequences and ... solutions? (C. Platzer, K. Mauch). The design and performance of a vertical flow reed bed for the treatment of high ammonia, low suspended solids organic effluents (M. Morris, R. Herbert). Ancillary Benefits. Constructed wetlands and nature conservation (P. Worrall et al. ). Combined Systems. The design and performance of a nitrifying vertical-flow reed bed treatment system (P. Cooper et al. ). Alternative Systems. Advantages and limitations of duckweed-based wastewater treatment systems (L. Bonomo et al. ). Non-Point Pollution Sources. Nitrogen removal and cycling in restored wetlands used as filters of nutrients for agricultural runoff (F.A. Comin et al. ). Industrial Wastewater. Integrated natural systems for treating potato processing wastewater (R.H. Kadlec et al. ). Sludge Dewatering. Constructed wetlands for sludge dewatering (J.L. De Maeseneer). Other Applications. Trialing wetlands to treat coal mining wastewaters in a low rainfall, high evaporation environment (W.R. Tyrell et al. ). Case Studies From Cold/Temperature Climates. Long term performance of the sand-plant-filter Schattweid (Switzerland) (A. Schonborn et al. ). Application of constructed wetlands for wastewater treatment in Hungary (G. Lakatos et al. ). Case Studies From Warm Climates. A critical evaluation of a pilot scale subsurface flow wetland: 10 years after commissioning (A. Batchelor, P. Loots).

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