use of advanced processes yields big savings and better

USE OF ADVANCED PROCESSES
YIELDS BIG SAVINGS AND BETTER
WATER QUALITY FOR SOMERTON
JAMES A. MATTHEWS, PE
SR. VICE PRESIDENT,
ENVIRONMENTAL WATER
JOSE PALOMARES,
OPERATIONS SUPERVISOR
Somerton, Arizona WWTP Location
YUMA
, AZ
7 Miles from US Border
SBR Expansion Option
u  Based
on Budget could Expand from 0.8 to
1.2 MGD = 0.4 MGD for $6.2M
u  Required Upgrading Existing Electrical
Service and Generator
u  Required Doubling Blower Capacity
u  Required Expansion of Drying Beds
Original 30 HP PD Blowers
Original Drying Beds
Original 0.8 MGD SBR Facility
Capacity Expansion Option
Alternative Approach Converts Process
to 4-Stage Continuous Flow BNR
Alternative Approach Converts Process
to 4-Stage Continuous Flow BNR
u  Increased
Capacity by 1.0 MGD for $7.6M
u  Reduced energy consumption
u  Reduced land use
u  New energy efficient turbo blowers
u  New energy efficient Aerostrip diffusers
u  New automated solids dewatering system
Somerton WWTP Expansion
u 
Continuous Flow BNR Allowed for:
–  Capacity Expansion to 1.8 MGD less than Budget
–  Over all Reduction in Plant Energy Consumption &
Demand
–  Blower HP Reduction from 180 to 100 HP
–  New Aeration Diffusers 33% Better Eff.
–  New Dewatering Facility Reduces Odors & O&M
Energy Efficient Blowers
Rotary Lobe Blowers vs. High-Speed Turbo Blowers
Capital Cost ($)
Additional
Rotary Lobe
New High-Speed
Turbo
$55,000
$104,500
Aeration Power Cost ($/year)
Evaluated Condition
Flow
MGD
Estimated
Savings/yr
Break-Even
Start-up
0.9
$6,000
8.3 years
Design Average Day Flow
1.8
$14,000
3.6 years
Energy Efficiency Air Diffusers
u  Existing
EDI Fine Bubble Diffusers vs.
Aerostrip Ultra-fine Bubble Diffusers
Capital Cost ($)
Expand Exist. EDI
New Aerostrip
$37,500
$92,500
Aeration Power Cost ($/year)
Evaluated Condition
Flow
MGD
Estimated
Savings/yr
Break-Even
Start-up
0.9
$15,500
3.6 years
Design Average Day Flow
1.8
$31,000
1.8 years
Energy Efficient Air Diffusers
60
33% Better Transfer =
33% Less Air Required!
Oxygen Transfer Eff. %
50
Aerostrip Ultra-Fine
40
EDI Fine Bubble
30
20
10
0
0.5
1
1.5
2
2.5
3
Gassing Rate (SCFM/sf)
3.5
4
4.5
5
So How is Performance?
Water Quality Comparison
SBR vs. BNR
Average Effluent Quality by Parameter
Year
BOD
In/Out
TSS
In/Out
Total Nitrogen
In/Out
2007
312 / 16
164 / 16
<10
2008
247 / 14
167 / 15
<7
2009
316 / 13
161 / 10
<7
2010
337 / 9
164 / 9
<8
2011
322 / 5
166 / 6
<8
2012
347 / 2
166 / 3
<8
Renovated Plant Start-up Mid April 2011
Power Comparison
SBR vs. BNR
Total kWh
85000
80000
75000
70000
New
Plant
On-line
65000
60000
55000
50000
45000
40000
Total kWh
Power Comparison
SBR vs. BNR
Billed Amount
$9,000
$8,500
$8,000
$7,500
New
Plant
On-line
$7,000
$6,500
$6,000
$5,500
$5,000
$4,500
$4,000
Billed Amount
New 50 HP K-Turbo Blowers
New Clarifiers
New Dewatering Building
New Twin Screw Presses
Aerial View of WWTP