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Development Of A Low-cost Alternative For Metal Removal From Textile Wastewater
Industrial wastewater contains many pollutants. This book focuses on heavy metals found in textile effluents because of their known toxicity effect in the environment. Wastewater from a textile industry (UTEXRWA) in Rwanda has been screened for the occurrence of Cd, Cr, Cu, Pb, and Zn. Batch and pilot experiments on adsorption equilibrium, kinetics, and sulfide precipitation using volcanic rock as adsorbent and packing material have been investigated. A low cost and integrated system for treatment has been developed, combining an anaerobic bioreactor as the main treatment step, followed by a polishing step composed by a polishing pond containing algae, duckweed, and water hyacinth. More than 90% of metal removal was achieved in the bioreactor, with metal sulfide precipitation as long-term removal mechanism. The use of algae and duckweed as alternatives for water hyacinth plants showed no differences between algae and duckweed ponds based on abiotic differences. Overall, both systems' performance was close and these systems are well suited as a polishing step for wastewater containing low metal concentrations. The integrated system for heavy metal removal showed how two complementary systems for heavy metal removal can work in combination and good removal performance can therefore be achieved.
Water Services Management And Governance
Water Services Management and Governance focuses on water services (water supply, wastewater services) and deals with connections between water resources and services and water resources. It covers water supply mainly in urban communities, sanitation and pollution control and water resources and their linkages to water services.
This book is divided in to four key sections relating to governance frameworks, technology and socio-ecological interactions, government and governance, and long terms policies. The chapters analyse the complexity of the water services sector based on a historical analysis of developments within the sector. The underlying conviction is that only by understanding past trends, processes and developments can the current situation in the water services be understood. Only through this understanding can policies for sustainable water services in the future be formulated. The four key sections relate to governance frameworks, technology and socio-ecological interactions, government and governance, and long terms policies.
Water Services Management and Governance raises awareness that an understanding of the past is a necessity to explore potential, probable and preferable futures. It is an essential basis for water sector reforms in any country, region or community. The book is written for experts in water utilities, ministries, municipalities, NGOs, donor agencies, private companies and regulators; as well as students and researchers in water policy and governance, and the management of water resources, services and infrastructure.
Editors: Dr. Petri S. Juuti is a historian, and Adjunct Professor in the universities of Tampere, Oulu and Turku. Tapio S. Katko, Civil engineer, Adjunct Professor, UNESCO Chairholder in Sustainable Water Services at Tampere University of Technology, Finland. Klaas Schwartz, Senior Lecturer, Urban Water Governance in the Department of Integrated Water Systems and Governance at the UNESCO-IHE Institute for Water Education, Delft, the Netherlands.
Assistant Editor: Riikka P. Rajala, Environmental Engineer, Post-Doctoral researcher in University of Tampere, Finland.
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