Water Filtration Practice

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ISBN: 9781583215951 | 1583215956
Cover: Paperback
Copyright: 9/23/2008

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This book provides a tool-kit of practical resources on techniques and procedures for maintenance and operation of water filtration plants. Written for experienced water treatment plant staff, the book covers granular media filters providing information on current conditions and performance, how to identify deficiencies and optimize the operation, whether with rapid gravity filtration or pressure filtration processes, plus information on slow sand filters and precoat filtration. The book is a condensed and updated version of Logsdon’s 2002 book Filter Maintenance and Operations Guide Manual (ISBN: 1-58321-234-5).

List of Figures	p. ix
List of Tables	p. xiii
Preface	p. xv
Acknowledgments	p. xvii
Introduction	p. 1
Background Information	p. 1
The Search for More Effective Water Treatment Techniques	p. 2
References	p. 5
Pretreatment: Management and Monitoring of Chemical Coagulation and Lime Softening	p. 7
Introduction	p. 7
Preoxidation	p. 7
Chemical Pretreatment Concepts	p. 11
Determining Appropriate Coagulation Chemistry and Evaluating the Results	p. 15
Practical Application of Methods for Determining and Monitoring Coagulation Chemistry	p. 31
Precipitive Lime Softening	p. 32
Summary	p. 36
References	p. 37
Chemical Feed and Mixing, Flocculation, and Clarification	p. 39
Introduction	p. 39
Chemical Feeders	p. 39
Mixing	p. 43
Flocculation	p. 48
Clarification	p. 53
Summary	p. 70
References	p. 70
Granular Media Filtration Concepts, Operation, and Management	p. 71
Introduction	p. 71
Media Properties and Filtration Concepts	p. 71
Managing Filter Operation	p. 81
Stopping and Restarting Filters Without Backwashing	p. 95
Summary	p. 98
References	p. 98
Water Treatment Under Difficult Raw Water Conditions	p. 101
Introduction	p. 101
Variable Raw Water Turbidity	p. 101
Variable Raw Water pH	p. 102
High Color and Low Turbidity	p. 102
High Turbidity and High Color/High NOM	p. 103
Taste and Odor	p. 105
Algae and Diatoms	p. 106
Cold Water	p. 109
Iron and Manganese	p. 110
Extreme Conditions	p. 112
Summary	p. 113
References	p. 113
Backwashing Filters	p. 115
Introduction	p. 115
Backwashing Fundamentals	p. 115
Backwashing Methods	p. 123
Managing and Monitoring Backwash	p. 125
Summary	p. 132
References	p. 132
Returning Filters to Service After Backwashing	p. 133
Introduction	p. 133
Filter Ripening, the Initial Improvement Period	p. 134
Procedures for Minimizing High Filtrate Turbidity When Starting Filters	p. 135
Using Multiple Procedures to Control the Initial Turbidity Spike	p. 143
Summary	p. 145
References	p. 145
Monitoring Filter Performance	p. 147
Introduction	p. 147
Physical Performance of Filters	p. 148
Filter Performance as Indicated by Water Quality	p. 151
Summary	p. 162
References	p. 162
Quality Control for the Laboratory and Treatment Plant	p. 163
Introduction	p. 163
Quality Control in the Laboratory	p. 163
Treatment Plant Concerns Related to Quality Control	p. 165
Summary	p. 173
References	p. 173
Filter Inspection and Maintenance	p. 175
Introduction: The Need for Filter Inspections	p. 175
Preparing for a Filter Inspection	p. 178
Filter Inspection Procedures and Frequency	p. 180
Detailed Descriptions of Filter Inspection Procedures	p. 182
Filter Maintenance Procedures	p. 199
Summary	p. 209
References	p. 209
Slow Sand Filtration	p. 211
Introduction	p. 211
How Slow Sand Filters Work	p. 212
Influence of Filter Design and Operation Parameters on Filter Performance	p. 217
Source Water Quality for Slow Sand Filters	p. 219
Operation, Monitoring, and Maintenance of Slow Sand Filters	p. 221
Summary	p. 227
References	p. 227
Precoat Filtration	p. 229
Introduction	p. 229
Precoat Filtration Concepts	p. 229
Filter Aid Materials	p. 240
Appropriate Source Water Quality and Process Capabilities	p. 241
Recommended Operating Procedures	p. 245
Inspection and Maintenance Activities	p. 252
Summary	p. 252
References	p. 253
Glossary	p. 255
Index	p. 283
About the Author	p. 295
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Water Filtration Practice

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