The International Gothenburg Symposia on Chemical Treatment have proven to be a unique platform for the exchange of ideas between theory and practice. They bring together administrators, engineers and scientists, who are concerned with water purification and wastewater treatment through precipitation, coagulation and subsequent solid/liquid separation. This volume contains the proceedings of the 3rd Symposium, focussing on Pretreatment. Pretreatment is understood as the scene total of all measures taken at the pollutant source to protect water supply, the sewerage system, the central treatment plant, and the aqueous environment. It is, where applicable, the most efficient measure in ecological and economic respects. The contributions of this third volume address questions of surveillance, automation and remote control of installations as well as the principles of legal, administrative and economic measures for regulations within the context of pretreatment. Special attention is given to the possibilities and limits of pretreatment of industrial discharges. Again it is the editors'privilege to acknowledge the invaluable help from the authors of this book. It is the editors' hope that they might convey the significance and potential of pretreatment in water supply, in industrial waste management and in municipal wastewater treatment and sludge handling.

Section I: Water Supply

From Filters to Forests: Water Treatment and Supply
Pretreatment of Drinking Water to Control Organic Contaminants and Taste and Odor
Water Quality Problems and Control Strategies for the Water Supply of Tianjin City
Humic Substances Removal by Alum Coagulation - Direct Filtration at Low pH
Modeling the Effects of Adsorbed Hydrolyzed Al(III)-Ions on Deep Bed Filtration
Polyectrolytes for the Treatment of Tap and Filter Back Washing Water
New Coagulant Injection Process
Odour Control by Artificial Groundwater Recharge
Section II: Industrial Discharges
Pretreatment of Industrial Wastewater: Legal and Planning Aspects - A Case Study
Clean Technology in the Netherlands: The Role of the Government
Synergistic Approach to Physical-Chemical Wastewater Pretreatment in the Food Industry
Separation of Heavy Metals from Effluents by Flotation
Pretreatment of Wastewater from the Automobile Industry
Industrial Wastewater Pretreatment of a Dental-Pharmaceutical Company
Membrane Separation Processes for Industrial Effluent Treatment
Alternative Treatment of De-icing Fluids from Airports
Separators and Emulsion Separation Systems for Petroleum, Oil, and Lubricants
Chemical Treatment of Flue Gas Washing Liquids
Section III: Wastewater and Sludge
Hydrogen Sulphide Control in Municipal Sewers
Coagulation as the First Step in Wastewater Treatment
Pre-precipitation for Improvement of Nitrogen Removal in Biological Wastewater Treatment
Chemically Supported Oil and Grease Removal in Municipal Wastewater Treatment Plants
Chemical-biological Treatment Versus Chemical Treatment - A Case Study
Reuse of Chemical Sludge for Conditioning of Biological Sludges
Influence of Sludge from Chemical Biological Wastewater Treatment on Nitrification and Digestion
Pretreatment of Sludge Liquors in Sewage Treatment Plants
Heavy Metal Removal from Sewage Sludge: Practical Experiences with Acid Treatment
Treatment of Filter Effluents from Dewatering of Sludges by a New High Performance Flocculation Reactor
Pretreatment for Wastewater Reclamation and Reuse.