Microfiltration and Conventional Treatment Teaching an old dog new Tricks!

Transcription

1 Microfiltration and Conventional Treatment Teaching an old dog new Tricks! Lessons Learned from an Integrated Water Supply in Brown County, Texas AWWA/AMTA 1

2 Overview The Need for Membranes Integrated System Operation Benefits Lessons Learned AWWA/AMTA 2

3 BCWID District established in 1925 Located in North/Central Texas Water Source: 29,000 AFY in Lake Brownwood Good water quality AWWA/AMTA 3

4 East WT Capacity of 4 MGD constructed in 1938 Expanded to 8 MGD in 1942 AWWA/AMTA 4

5 West WT Capacity of 10 MGD constructed in 1985 Down-rated to 7.5 MGD AWWA/AMTA 5

6 Infrastructure Study In 2002, District recommended to uprate the West lant East lant would be retired Valves Switchgear Membranes could be competitive with conventional expansion AWWA/AMTA 6

7 ilot Study ilot Test November 2003 to March 2004 Approved flux rate of 80 gfd highest in Texas AWWA/AMTA 7

8 MF lant Rated capacity of 9.0 MGD at 20 C Began selling water in 2009 Additional membrane rack helps the plant achieve a higher net production rate: Temperature ( C) Gross Flux Rate (gfd) Net roduction (MGD) AWWA/AMTA 8

9 Overview Brown County Water Improvement District No. 1 (BCWID) Integrated System Operation Benefits Lessons Learned AWWA/AMTA 9

10 BCWID WT Modes of Operation In arallel Conventional Membrane In Series AWWA/AMTA 10

11 arallel West Conventional lant Microfiltration lant Ammonia Rapid Mix/ Flocc n Alum Chemical Mix Basin MF umps MF Filtration Membranes Terminal Storage Reservoir Used During onventional Treatment Mode Sedimentation/ Tube Settling Settled Water Transfer Line Used During re-treatment Mode Filters Transfer S Ammonia Ammonia CI Waste, Sedimentation/ BW Sludge Storage Lagoon Clearwells Filter BW S Dist n S To Dist n AWWA/AMTA 11

12 Conventional West Conventional lant Ammonia Rapid Mix/ Flocc n Alum Terminal Storage Reservoir Used During onventional Treatment Mode Sedimentation/ Tube Settling Filters Transfer S CI Waste, Sedimentation/ BW Sludge Storage Lagoon Clearwells Filter BW S Dist n S To Dist n AWWA/AMTA 12

13 Membrane Microfiltration lant Chemical Mix Basin MF umps MF Filtration Membranes Terminal Storage Reservoir Ammonia CI Waste, Sedimentation/ BW Sludge Storage Lagoon Ammonia Clearwells Dist n S To Dist n AWWA/AMTA 13

14 Series West Conventional lant Microfiltration lant Ammonia Rapid Mix/ Flocc n Alum Chemical Mix Basin MF umps MF Filtration Membranes Terminal Storage Reservoir Sedimentation/ Tube Settling Settled Water Transfer Line Used During re-treatment Mode Ammonia CI Waste, Sedimentation/ BW Sludge Storage Lagoon Ammonia Clearwells Dist n S To Dist n AWWA/AMTA 14

15 Overview Brown County Water Improvement District No. 1 (BCWID) Integrated System Operation Benefits Lessons Learned AWWA/AMTA 15

16 Advantages Capital Cost Savings Operational Cost Savings Future Expansion Cost Savings AWWA/AMTA 16

17 Advantages Flexibility of Operation Common component sharing Tastier water! AWWA/AMTA 17

18 Overview Brown County Water Improvement District No. 1 (BCWID) Integrated System Operation Benefits Lessons Learned AWWA/AMTA 18

19 Lessons Learned Cross-training plant staff Integration of Regulatory Reporting Seven Disinfection Zones AWWA/AMTA 19

20 Lessons Learned Electronic Recording and Reporting hotos courtesy of homelandsecureit.com and icorestudio.com AWWA/AMTA 20

21 Lessons Learned Chemical Requirements CT credits WT Facility Description Cryptosporidium Removal Credits (log removal) Giardia Removal Credits (log removal) Virus Removal Credits (log removal) MF, UF, NF & RO without retreatment MF, UF, NF & RO with coagulation and flocculation MF, UF, NF & RO with coagulation, flocculation and clarification No credit given AWWA/AMTA 21

22 Acknowledgements BCWID Staff AMTA and AWWA Mike Morrison,.E., BCEE AWWA/AMTA 22

23 Takeaways Integrated systems can be cost-effective Relationships are your best resource Be willing to adapt Scott Hekman, EIT Freese and Nichols, Inc. AWWA/AMTA 23