Transcript The Collection system Dilemma (CMOM, I/I, and CSO)

Collection system
Monitoring
(CMOM, I/I, and CSO)
Bob Glenn
Western U.S. Sales Manager
Teledyne Isco Inc.
Municipalities striving to…
– Deliver a high level of service to their
customers
– Maintain regulatory compliance at all
times
– **Improve asset management
– **Develop more efficient & productive
work management plans
**Especially critical in current municipal environment
The Current Economic
Dilemma
Estimated 84% of all communities will be
impacted significantly in 2009—US Weekly
What does this mean?
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Reduced staffing (RIF)
Hiring & wage freezes
Fewer new projects being funded
Budget dollars spread thinner across
the board
– Replacement equipment reduced or cancelled
– Training & professional development
opportunities limited
The Challenge
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Current economy does not grant
Municipal entities a “mulligan” against
their permit requirements
Like everyone else…Do more with less.
Problems can increase in intensity and
frequency with fewer resources to
engage in preventative maintenance.
Complicating the Challenge
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Limited resources available to rectify
often numerous problems
Aging assets & infrastructure
Elevated regulatory requirements
Rapid rise in citizen awareness
elevates expectations
Potential for I/I events to have
“magnified” consequences
Infiltration/Inflow
-Health risk and property damage
-Renders WWTP processes less efficient
-Uses up sewer capacity limiting expansion
capability
Typical I/I Sources
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Cracked & broken pipes
Root intrusion
Roof vents & drains in older structures
Older or improperly fitted manhole
covers
CSO tie-ins
Illegal sewer service taps (sump
pumps etc…)
Methods of Identifying
I & I Sources
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Cameras
Smoke Testing
Flow
Measurement
Smoke Testing and
Cameras are fine
secondary
investigative tools,
but are not practical
for day to day
monitoring
SSO
(Sanitary Sewer Overflow)
Surcharge events & blockages not only get
you in trouble with regulators, but also
invite the ire of the local public due to
potential adverse affects to public health
and the environment.
SSO
(Sanitary Sewer Overflow)
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80% of U.S. population provided with
drinking water from surface sources
Deadly bacteria deposited into these surface
waters (human illness due to direct
exposure + food chain contamination)
Property depreciation, extensive cleanup
costs, long term health issues
65% of polled municipalities in lower 48
reported AT LEAST one major SSO event
Where do we start ?
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Develop an overall strategy
Conduct internal audit to assess core
competency & capabilities
Identify resources available to assist in
addressing problems
Collect professional input when
needed
Begin to “know your system”
Indicators of System
performance
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Peaking responses during storm events
System (basin) response time
# of customer complaints
# of blockages
# and volume of un-permitted discharges
Effect on operation of treatment facilities
Flow Monitoring? Why?
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NPDES – Permit Compliance
Billing applications
– Flumes/Weirs
I & I studies
– Promote efficient treatment
– CSO and SSO reduction
cMOM
– Capacity Management Operations and
Maintenance (System Optimization)
Storm water monitoring
Flow Measurement
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The absolute KEY to understanding &
optimizing the performance of your
collection system!
Various technologies to choose from
Examine system needs and potential
monitoring locations BEFORE committing to
any single technology
Multiple technologies often needed due to
myriad of site-specific variables
Basin Wide Analysis
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Careful
identification of
drainage basins
throughout the
system
Systematic
approach to
prioritize
The Systematic approach
-Volume/effect of inflow on WWTP
process & system welfare must be
weighed
-”Pain Index” must be considered
-Limited resources to resolve issues
also must be considered
Step #1: Temporary
Monitoring
In flo w & In filtra tio n S tu d y
D ry v s W e t W e a th e r
D r y W e a t h e r F lo w ( 2 4 4 1 0 0 1 0 . 1 g a l)
W e t W e a t h e r F lo w ( 3 2 6 5 5 4 6 5 . 2 g a l)
I n f lo w & I n f ilt a t io n ( 8 2 4 5 4 5 5 . 1 g a l)
R a in f a ll ( 1 . 6 8 in )
7000
6000
4000
g
p
m
5000
3000
2000
1000
in
0
0.10
0.05
0.00
2 M on
A ug 99
3 Tue
4 W ed
5 Thu
6 Fri
8/1/1999 12:00:00 A M - 8/8/1999 12:00:00 A M
7 S at
8 S un
Temporary Monitoring
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Use lightweight, battery powered flow
meters to collect baseline data
Identify & Prioritize problems basins
Investigate & Eliminate major I/I
contributors
Structure finite maintenance resources
to address biggest threats
Targets for Maintenance
Programs based on flow data
Analysis
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Excessive siltation reducing capacity
Hydraulic issues causing backups &
surcharges
Identify excessive or illegal flow
contributors
Address H2S generation issues
Gain insight into pump station
performance
Data Indicating excessive
siltation
Surcharge/Reverse flow
Pump Station performance
City of Jackson
Flowlink 4 for Windows
Level (2.77 in)
Velocity (4.84 ft/s)
Total Flow (0.0078930 mgal)
in
5.0
2.5
ft/s
5.0
2.5
750
gpm
500
250
0
9:20
16 Mon Jun 2003
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6/16/2003 9:15:00 AM - 6/16/2003 10:15:00 AM
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Variable Rate Data Storage
Variable Rate Data example for
I/I analysis
Modeling
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Helps “predict” flow
patterns and system wide
capacity.
Assess seasonable cycles &
variables
Used to approve municipal
expansion projects
– New residential housing area
– New industrial plant
expansion
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Can help with prioritization
by considering future I/I’s
effect on future expansion
Permanent “Fixed-site”
Monitoring
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Placed at key
points in the
system
Often AC power w/
battery backup
Tied to plant w/
SCADA or other
telemetry
Permanent “Fixed-site”
Monitoring
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Allows reaction time @ plant during
extreme events via alarms
Opportunity to divert flows to
maintain plant integrity
Insight into effectiveness of
maintenance programs with
elimination of problem flows, backups,
and siltation issues
The St. Louis project
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430 permanent
meters
Tied to server &
Web U/I server
Remote alarms &
event notification
CSO event
duration &
overflow volume
The Future holds???
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This is too big
an issue to
ignore…
Expertise in this
area can benefit
both
government &
private sector
employees
CONCLUSION
Regardless of Consultant or
Municipality conducting the study…
CAREFUL PREPARATION AND
ANALYSIS is the key!
ALWAYS have a plan. Be systematic &
thorough, using the best information
& technologies.
Questions?