Replacing Old Wastewater Disinfection Systems: When to Upgrade Existing UV System:

Transcription

1 Replacing Old Wastewater Disinfection Systems: When to Upgrade Existing UV System: Bob English Regional Sales Manager Thursday, September 7, 2017

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4 Types of Disinfection: Chemical Chemical Chlorine / Chloramine Ozone Others Considerations Storage Safety Aquafer salinification Degradation By-product formation Resistant pathogens cryptosporidium and Giardia.

5 Dangerous Pathogens Group " BACTERIA Kind! Coliforms! Salmonella! Vibrio! Legionella! E.coli & Entercocci Disease! Fever, intestinal disease! Typhoid fever! Cholera! Pneumonia! Fever, gastro enteral disease " VIRUSES " Protozoa! Hep A! Polio! Adenovirus! Cryptosporidia *! Giardia *! Hepatitis! Polio! Pneumonia, brochitus, GI diseases! Potentially Serene Intestinal diseases * Both Crypto and Giardia are very resistent to chemical disinfectants including chlorine 5

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9 .T)*+'5?6%88'5&-)c.T*b) 254 nm 100% e.g. 65% / 1 cm 1 cm Typical wastewater UVT: ~ 45 65% / nm 9

10 IR Invisible Visible light 780 UV Invisible Ultraviolet UVA Black light nm UVB Suntan nm UVC Germicidal nm UV-Vacuum nm Ultraviolet

11 Inactivation of pathogenic microorganisms due to photooxidation of DNA DNA absorbance curve Medium Pressure Lamp nm Low Pressure Lamp 254 nm UV exposure penetrates cell wall, disrupts DNA and prevents cell reproduction UV-C energy that causes DNA damage is most effective at 268 nm (not the LP 254 nm) 1 1

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15 )/9-&8+'$)I"89"8);A).T)U'69?) Medium Pressure Lamp Low Pressure Lamp 8 to 20 LP/LPHO lamps per 1 MP lamp but Lamp Electrical Efficiencies 14-16% for Medium Pressure Lamps 29-35% for LP and LPHO Lamps

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17 UV Dose for How Much UV Dose is Required? 4 log (99.99%) Inactivation UV Action Spectrum UV 101 July 9 th,

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20 KE'8)8(9-);A).T)/(?8-6),;)(;")E'G-h)! Lamp Types! LP! LPHO! MP! UV Unit configuration! Open Channel! Closed Vessel 20

21 Determine current systems status Primary Hurdles 1.!System Efficacy 2.!Maintenance Required? 21

22 Steps to determine - replace or upgrade your current UV system: Next Step - Determine current operation 3. Condition of the channel or reactor 22

23 &"++-58).T)?(?8-6H) The reactor/channel is in good shape then: 4.! Correct operating issues 23

24 &"++-58).T)?(?8-6H) 4.! Real costs of operation of alternatives 24

25 (;"+)&"++-58).T)?(?8-6H) 5.! Compare proposals for new UV system, UV upgrade against the cost of doing nothing with life cycle costs in mind. 25

26 (;"+)&"++-58).T)?(?8-6H) 6.! Finally compare the costs of : A.! B.! C.! Doing nothing Downtime and obsolescence risks vs Upgrade - OPEX improvements and operations efficiency gains vs Demolition and install new system Engineering, Contactors and downtime challenges. Determine the best way to go forward based on estimated costs, operation risks and site preferences associated with each approach. 26

27 No new construction costs such as concrete work, pad installation or piping upgrades. Most upgrades come with a new system warranty. Quicker change over vs replacement Less disorder and confusion than replacement Typically easier operator transition! Familiar maintenance and operations More predictable install time and space 27

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30 Things you can do to optimize UV system efficiency and performance: 1.!Online UVT monitor 2.!Flow Meter 3.!Clean Sleeves frequently 4.!Change the lamps as required 5.!Turn units off when not in use 6.!Use the right lamp for your application A.! High or Low UVT B.! High or Low Dose C.! Cold or Warm Water D.! Etc.

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32 College Place WA, WWTP 5.8 MGD SRB WWTP Effluent to Garrison Creek or lagoon #2 for the irrigation system 3 InLine 5000 WWTP UV units installed in 1999 In July 2016 they evaluated replacement options- Upgraded: Power, control, and lamp systems Absolute UV intensity sensors Flow meter input to UV Controller UltraWipe sleeve cleaning and performance Advantages for them vs replacement <35% cost to remove and replace >$18K annual energy savings - Turndown 2 to 4 month increase in lamp life

33 /%$G-+8;5C)IR)KK*!) ^=)`SL)M$'??%&)M$'+%Q-,)KK*!) Effluent to Silver Creek after meeting all state and federal permit requirements or Oregon Garden for the irrigation system 2 Old Closed Channel UV units installed in 1992 In August 2016 they evaluated replacement options- Complete Replacement:!Closed channel units were no longer supported!advantages for them vs replacement >$28K annual energy savings - Turndown Dose Paced systems Reduced maintenance 65% 4 month increase in lamp life Greater reliability and increased confidence

34 Sparks, GA WWTP 1 MGD Lagoon based WWTP Effluent to local creek 2 InLine 1000 WWTP UV units installed in 2000 In June 2016 they evaluated replacement options- Upgraded: Power, control, and lamp systems Absolute UV intensity sensors Flow meter input to UV Controller Advantages for them vs replacement <30% cost to remove and replace >$9K annual energy savings - Turndown 1 to 2 month increase in lamp life 50% less maintenance Finely tuned

35 D;$%,'()!'+7C)!O)KK*!) Effluent to Abers Creek 2 InLine 2500 WWTP UV units installed in 2002 In March 2013 they evaluated replacement options as their flowrate had increased and they wanted additional options efficiency- Upgraded:!Power, control, and lamp systems!absolute UV intensity sensors!flow meter input to UV Controller!UV Dose Pacing and SCADA compatibility!advantages for them vs replacement <25% cost to remove and replace >$2.5K annual energy savings - Turndown 2 month increase in lamp life Treated their higher flowrate

36 Roper, NC WWTP 148 GPM Activated Sludge/ox ditch based WWTP Effluent to local Creek 2 InLine 250+ WWTP UV units installed in 2007 In April 2012 they evaluated replacement options as their flowrate had increased. Replaced with larger InLine 400+ as flowrate exceeded their current system and they had to increase their pipe size: New systems increased their design capacity to 0.8 MGD Connected flow meter input to UV controller # Dose pacing UltraWipe sleeve cleaning and performance

37 *"$'$%9)*+%#-?)k"%$)M-,'C)KO))KK*!) 32o<)`SL)`4R)#'?-,)KK*!) Effluent land applied 2 InLine 3000 WWTP UV units installed in 1999 May 2017 they evaluated replacement options as their flowrate had increased, frequent sleeve cleaning and to avoid component and consumable obsolescence Upgrading now:!latest Electronic Ballast/lamp matching!ultrawipe sleeve cleaning and performance!flow meter to UV Controller Dose pacing Advantages for them vs replacement <28% cost to remove and replace >$2.5K annual energy savings - Turndown 2 month increase in lamp life Treated their higher flowrate

38 What did we Learn Today? 1.! UV Disinfection basics 2.! UV system types 3.! Process to evaluate old UV systems 4.! Systematic approach to weigh upgrade alternatives

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