FROM THE PREFACE Wastewater collection systems are dynamic, not
static. There is no single maintenance method, equipment, or
technique that works best. Keeping an open mind, trying new
techniques and technologies benefits sewer system operators. No two
collection systems are alike. Maintenance staffing, skill levels,
equipment, budgets, age and complexity of the system make each
agency unique. However, collection systems do have many traits and
problems in common. Based on inventory and analysis, problems are
identified. Defects may then be prioritized, and corrective
maintenance operations put into effect. Preventive maintenance
techniques can be applied to all collection systems. Preventive
maintenance is cost-effective; it strives to prevent problems from
occurring rather than reacting to difficult situations and "putting
out fires." This book examines problems shared by all agencies:
roots, grease, deterioration, hydraulic inefficiencies and
structural defects. New solutions to age-old problems are applied:
TV inspection and video interpretation, rehabilitation analysis and
trenchless technologies. Computerized maintenance management and
GIS softwares are discussed. Jetting, line cleaning and exciting
developments in nozzle technology are included. Roots and chemical
root control foam, wastewater control and grease are major topics
as well. Wastewater Collection System Maintenance shares insights
drawn from operator experience, trial and error, successes and
failures in the field, interviews and years of research and
studies. A user-friendly rating and evaluation system is explained
and applied to field conditions. Equipment operation and
maintenance, and "tricks of the trade" are also discussed. As
cities grow, new systems are extended upstream from older sewers.
Many of these core drainage basins are now under capacity and in
need of capital improvement projects. There are approximately
600,000 miles of sanitary sewers in the country. Nationwide, there
exists a huge backlog of sewer pipes that need rehabilitation.
Replacement would cost many billions of dollars. Maintenance
operators are entrusted with the care and feeding of an aging sewer
infrastructure.
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