Mathematical modelling of activated sludge systems is used widely for plant design, optimisation, training, controller design and research. The quality of simulation studies varies depending on the project objectives, finances and expertise available. Consideration has to be given to the model accuracy and the amount of time required carrying out a simulation study to produce the desired accuracy. Inconsistent approaches and insufficient documentation make quality assessment and comparison of simulation results difficult or almost impossible. A general framework for the application of activated sludge models is needed in order to overcome these obstacles. The genesis of the Good Modelling Practice (GMP) Task Group lies in a workshop held at the 4th IWA World Water Congress in Marrakech, Morocco where members of research groups active in wastewater treatment modelling came together to develop plans to synthesize the best practices of modellers from all over the world. The most cited protocols were included in the work, amongst others from: HSG (Hochschulgruppe), STOWA, BIOMATH and WERF. The goal of the group is to set up an internationally accepted framework to deal with the ASM type models in practice. This framework shall make modelling more straightforward and systematic to use especially for practitioners and consultants. Additionally, it shall help to define quality levels for simulation results, a procedure to assess this quality and to assist in the proper use of the models. The framework will describe a methodology for goal-oriented application of activated sludge models demonstrated by means of a concise guideline about the procedure of a simulation study and some illustrative case studies. The case studies shall give examples for the required data quality and quantity and the effort for calibration/validation with respect to a defined goal. The final report will include an extended appendix with additional information and details of methodologies. Additional features in Guidelines for Using Activated Sludge Models include a chapter on modelling industrial wastewater, an overview on the history, current practice and future of activated sludge modelling and several explanatory case studies. It can be used as an introductory book to learn about Good Modelling Practice (GMP) in activated sludge modelling and will be of special interest for process engineers who have no prior knowledge of modelling or for lecturers who need a textbook for their students. The STR can also be used as a modelling reference book and includes an extended appendix with additional information and details of methodologies. Scientific and Technical Report No. 22

Humedales para tratamiento es el septimo volumen de la serie "Tratamiento biologico de aguas residuales" (en ingles "Biological Waste Water Treatment Series"), que provee una presentacion de vanguardia sobre la ciencia y tecnologia del tratamiento de aguas residuales. Los principales tipos de sistemas de humedales son tratados en este volumen, a saber: (i) Humedales de flujo subsuperficial horizontal, (ii) Humedales de flujo vertical; (iii) Humedales de flujo vertical tipo frances; (iv) Humedales intensificados; (v) Humedales de flujo libre; (vi) otras aplicaciones de los humedales para tratamiento. El libro presenta en forma clara y didactica, los conceptos basicos, los principios de la tecnologia, desempenos esperados, criterios de diseno, ejemplos de diseno, aspectos constructivos y guias para la operacion. El libro ha sido escrito en su version inglesa, y traducido al castellano, por un equipo internacional de expertos en el campo de los humedales para tratamiento.

Water quality standards across the world are being re-written to promote healthier ecosystems, ensure safe potable water sources, increased biodiversity, and enhanced ecological functions. Treatment wetlands are used for treating a variety of pollutant waters, including municipal wastewater, agricultural and urban runoff, industrial effluents, and combined sewer overflows, among others. Treatment wetlands are particularly well-suited for sustainable water management because they can cope with variable influent loads, can be constructed of local materials, have low operations and maintenance requirements compared to other treatment technologies, and they can provide additional ecosystem services. The technology has been successfully implemented in both developed and developing countries. The first IWA Scientific and Technical Report (STR) on Wetland Technology was published in 2000. With the exponential development of the technology since then, the generation of a new STR was facilitated by the IWA Task Group on Mainstreaming Wetland Technology. This STR was conceptualized and written by leading experts in the field. The new report presents the latest technology applications within an innovative planning framework of multi-purpose wetland design. It also includes practical design information collected from over twenty years of experience from practitioners and academics, covering experiments at laboratory and pilot-scale up to full-scale applications. Scientific and Technical Report No.27

Los estandares de calidad del agua alrededor del mundo estan siendo actualizados para garantizar ecosistemas saludables, asegurar recursos hidricos para potabilizacion, incrementar la biodiversidad, y mejorar las funciones ecologicas. Los humedales para tratamiento son utilizados para depurar una variedad de aguas residuales o contaminadas, lo que incluye, aguas residuales municipales, escorrentia agricola y urbana, efluentes industriales, y efluentes de los vertederos de excesos en alcantarillados combinados, entre otros. Los humedales para tratamiento son particularmente adecuados para la gestion sostenible del agua porque pueden manejar cargas variables en los afluentes, pueden ser construidos con materiales locales, tienen pocos requerimientos de operacion y mantenimiento en comparacion a otras tecnologias, y pueden proveer servicios ecosistemicos adicionales. La tecnologia ha sido exitosamente implementada en paises desarrollados y en vias de desarrollo. El primer Reporte Cientifico y Tecnologico (STR, por sus siglas del ingles, Scientific and Technical Report) sobre la tecnologia de humedales fue publicado en el 2000. Con el desarrollo exponencial de la tecnologia desde entonces, la generacion de un nuevo STR fue desarrollada por el Grupo de trabajo de la IWA sobre la integracion de la tecnologia de humedales (IWA Task Group on Mainstreaming Wetland Technology). Este STR fue conceptualizado y escrito, junto con su traduccion al castellano, por expertos lideres en la materia. Este nuevo reporte presenta las ultimas aplicaciones de la tecnologia dentro de un marco de planificacion innovador del diseno de humedales para multiples propositos. Tambien, incluye informacion practica para el diseno recolectada a partir de 20 anos de experiencias de profesionales y academicos, que abarca experimentos a escala de laboratorio, piloto y real.

The ebook edition of this title is freely available as an Open Access text. Treatment Wetlands is the seventh volume in the Biological Wastewater Treatment series, which gives a state-of-the-art presentation of the science and technology of sewage treatment. The major variants of wetland systems are covered in this volume, namely: (i) horizontal flow wetlands; (ii) vertical flow wetlands; (iii) French vertical flow wetlands; (iv) intensified wetlands; (v) free water surface wetlands; (vi) other applications of treatment wetlands. The book presents in a clear and didactic way the main concepts, working principles, expected performance, design criteria, design examples, construction aspects and operational guidelines. The book has been written by an international team of top experts in the field of treatment wetlands.