Chemical water and wastewater treatment : proceedings of the 4th Gothenburg Symposium 1990, October 1-3, 1990, Madrid, Spain

Front Matter....Pages I-XI Quo Vadis Chemical Treatment?....Pages 1-14 Front Matter....Pages 15-15 Optimization of Flocculation in Connection with Various Solid-Liquid Separation Processes....Pages 17-32 Destabilization and Aggregation in Turbulent Pipe Flow....Pages 33-54 Colloid Destabilization in the Treatment of Surface Waters Containing Colloid-Stabilizing Pollutants....Pages 55-73 Effects of Floc-Virus Association on Chlorine Disinfection Efficiency....Pages 75-84 Flocculation in Static Mixer....Pages 85-90 Front Matter....Pages 91-91 Pebble Matrix Filtration — A New Way of Floc Separation....Pages 93-103 Floc Strength in Bridging Flocculation....Pages 105-115 Floc Formation and Breakup in Continuous Flow Flocculation and in Contact Filtration....Pages 117-126 Industrial Application of Weighted Flocculation: Development of the Actiflo® Clarification Process....Pages 127-137 Extended Coagulation for Reagent and Space Savings with Wastewater Lamella Settling....Pages 139-150 Liquid-Solid Separation by Electroflotation: An Attractive Alternative to Dissolved Air-Flotation....Pages 151-167 Unit Operations for the Removal of Solids and their Combinations in Water Treatment....Pages 169-186 Front Matter....Pages 187-187 Coagulation with Prepolymerized Metal Salts....Pages 189-220 Simultaneous Phosphate Precipitation and Particle Destabilization Using Aluminium Coagulants of Different Basicity....Pages 221-242 The Effect of Five Coagulants on the Concentration and Distribution of Small Particles in Sewage Water....Pages 243-256 Process Control of a Chemical Water Treatment Plant by a Continuous Flocculation Test....Pages 257-269 Increasing the Surface Load at a Direct-Precipitation Plant, VEAS, Norway....Pages 271-282 Front Matter....Pages 283-283 Control of Reservoir Water Quality....Pages 285-304 Optimization of Sequential Unit Operations for Removal of Organics from Drinking Water....Pages 305-332 Front Matter....Pages 283-283 Methods of Improving Granular Filters for Water Purification....Pages 333-339 Aluminum Coagulation of Natural Organic Matter....Pages 341-359 Treatment of Coloured Surface Water by Coagulation/Direct Filtration: Effect of Water Quality, Type of Coagulant and Filter Aids....Pages 361-376 A Simple Test for Determination of Optimal Doses in the Treatment of Humic Waters....Pages 377-390 Two-Stage Iron(III) Coagulation As a Method of Improving the Effectiveness of the Water Purification Process....Pages 391-397 Residual Aluminium Concentration in Drinking Water After Treatment with Aluminium or Iron Salts....Pages 399-410 Front Matter....Pages 411-411 Pre-Precipitation and the High-Rate Process for Domestic Wastewater Pretreatment in Finland — A Case Study....Pages 413-427 Measures for Nutrient Removal from Sewage Wastewaters in Estonia....Pages 429-442 Full Scale Experience with Biological and Chemical Phosphorus Removal....Pages 443-459 Upgrading a Primary Treatment Plant for Nutrient Removal....Pages 461-470 Ammonia and Phosphate Elimination by Biologically Intensified Flocculation Filtration Process....Pages 471-481 Virus Risk Analysis in Wastewater Reclamation and Reuse....Pages 483-496 Front Matter....Pages 497-497 Chemical-Biological Nutrient Removal — The HYPRO Concept....Pages 499-510 Biological Hydrolysis of Sludge from Primary Precipitation....Pages 511-520 Carbon Source for Denitrification from Pre-Precipitated Sludge....Pages 521-529 The Use of Industrial By-Products as a Carbon Source for Denitrification....Pages 531-541 Improving the Denitrification Potential in Biological Wastewater Treatment by Dosing Carbon from Sludge Hydrolysis....Pages 543-560 The biennial International Gothenburg Symposia on Chemical Water and Waste­ water Treatment have proven to be a unique platform for the exchange of ideas and experiences between administrators, engineers and scientists active in the fields of water supply, wastewater disposal and pollution control. The First Symposium (Gothenburg, 1984) provided a long needed survey over theory and application of chemical water and wastewater treatment. The Second Symposium (Berlin, 1986) was devoted to aspects of recycling in chemical water and wastewater technology. The Third Symposium (Gothenburg, 1988) recognised the growing need and the potentials of pretreatment. These proceedings of the 4th Symposium focus on technology transfer from chemical treatment theory to practical treatment of drinking water and industrial or domestic wastewater. The contributions are devoted to questions of floc for­ mation and floc separation as well as problems and practical solutions associated with chemicals and dosing control. Special attention is given to the combination of chemical and biological processes for nutrient removal from wastewater. 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 chemical treatment in solving the challenging problems water purification, wastewater disposal and pollution control.