Non Contact UV System at the Yakima Regional WWTP
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1 Installation of a Flow Through- Non Contact UV System at the Yakima Regional WWTP Sean Goris, P.E. Engineering Manager September 15, 2009
2 Yakima Treatment Facility Background Secondary treatment facility Treating municipal and industrial wastewaters Largest industrial contributor is Del Monte Foods Trickling filter and activated sludge treatment Solids are digested and dewatered on-site UV System replaces an existing Chlorine Contact Chamber using gaseous chlorine
3 UV Disinfection System Design Criteria Number of Reactors (2 service + 1 redundant) Number of Banks per Channel Peak Hour Flow Peak Hour Flow per Reactor Maximum Headloss through System 3 EA 2 EA 28.0 MGD 14.0 MGD 8.0 inches
4 Yakima UV System Design System supplier: Enaqua System was placed in the existing chlorine contact chamber The dual chamber chlorine contact basin allowed for continued disinfection while system was constructed in the UV side
5 UV System Layout
6 UV System Layout Channels controlled by influent and effluent sluice gates System level control provided by existing effluent weir
7 Enaqua Flow-Through Reactor Reactor consists of 100 flowthrough tubes Tubes arranged Tubes arranged in a 10 x 10 matrix
8 Enaqua Flow Through Reactor Source: Enaqua
9 Enaqua Flow Through Reactor Source: Enaqua
10 Enaqua Flow Through Reactor Total Number of Lamps 132 lamps per bank 264 lamps per channel 792 lamps in complete system One flow meter per reactor
11 Enaqua Flow Through Reactor Source: Enaqua
12 System Installation
13 System Installation
14 System Installation
15 System Installation
16 System Installation
17 Installed System
18 Installed System
19 Installed System
20 Installed System
21 Installed System
22 Installed System
23 Installed System
24 Electrical Building
25 Control Panel
26 UV Disinfection System Performance Criteria Number of Reactors (2 + 1) 3 EA Number of Banks per Channel 2 EA Peak Hour Flow 28.0 MGD Peak Hour Flow per Reactor 14.0 MGD Min. UV Dosage at 8,750 Hours 30,000 µws/cm 2 UV Transmittance 60 % 30-day Geometric Mean 200 #/100 ml Weekly Geometric Mean 400 #/100 ml Maximum Headloss through System 8.0 inches Maximum Power Consumption 180 Amps
27 System Control Philosophy All lamps are on when a bank is in service Units are operated in Lead, Lag1, Lag2 sequence Operates on a Step Flow scheme Six steps relate to six banks 3 units 2 banks each Lead and lag start flows are operator adjustable Units are shut down at same flow set points
28 System Control Philosophy Units are automatically advanced if the lead unit has been on for an adjustable period of time Gates to the channels are controlled by the UV system PLC
29 System Control Philosophy Flow is measured by magnetic flow meter attached to a single tube Flow from that tube is multiplied by 100 to measure total unit flow Reactor cooling provided by plant non-potable water system Non-potable system is backed up by a sump pump in each effluent channel
30 Start up and Testing Initial start up began in July Units have been in operation since early in August
31 Start up and Testing Testing consisted of running each unit at flows near the maximum design flows Flows ranged from 6.2 to 13.5 MGD Three test settings for each reactor: Stage 1 ON Stage 2 OFF Stage 1 OFF Stage 2 ON Stage 1 ON Stage 2 ON 7.0 MGD 7.0 MGD 14.0 MGD Total of 9 sampling events Samples taken at 0, 30, 60, 90, 120 minutes
32 Testing Results F e c a l C o lif o rm, # /1 0 0 m L Effluent coliform, MPN/100 ml Compliance Requirement, MPN/100 ml Test Number
33 Transmittance Data n c e, % T ra n s m it t a Flow, gpm
34 System Performance 120 lif o r m, # /1 0 0 m L E f f lu e n t F e c a l c o Dose, mj/cm2
35 System Performance 120 E f f lu e n t f e c a l c o lif o rm M P N /1 0 0 m L Flow rate per lamp/gpm/lamp
36 Other System Testing Factors Power Consumption Headloss System was within specifications for both factors
37 Operations To-date Currently working the bugs out of the system There have been a few controls, electronics and grounding related issues Supplier (ENAQUA) has worked diligently to correct issues and maintain operation
38 Sean Goris, P.E. Black & Veatch Ph:
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