1 / 15

Seawater RO Desalination CDPH Regulatory Considerations

2 nd Annual CalDesal Conference - 2013. CalDesal 2013 2 nd Annual Conference. Seawater RO Desalination CDPH Regulatory Considerations. Sean Sterchi, P.E. California Dept. of Public Health. 2 nd Annual CalDesal Conference - 2013. Outline. Assumptions Source Evaluation

aysha
Download Presentation

Seawater RO Desalination CDPH Regulatory Considerations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 2nd Annual CalDesal Conference - 2013 CalDesal 2013 2nd Annual Conference Seawater RO DesalinationCDPH Regulatory Considerations Sean Sterchi, P.E. California Dept. of Public Health 1

  2. 2nd Annual CalDesal Conference - 2013 Outline • Assumptions • Source Evaluation • Alternative Filtration Technology • Considerations • Permitting Process 2

  3. 2nd Annual CalDesal Conference - 2013 Status of Desal in California • Proposed projects in the next decade1 • Pittsburg • Santa Cruz • Cambria • Monterey • El Segundo • Huntington Beach • Dana Point • Carlsbad • Camp Pendleton • Otay (Rosarito) • Permitted projects in the last decade • Sand City (2010, 0.6-MGD, brackish wells) • Catalina Island (1991, reactivated 2003, 0.2-MGD, brackish wells) 1Source, fall 2013 3

  4. 2nd Annual CalDesal Conference - 2013 Assumptions • General guidelines • Surface Water Treatment Rule (SWTR) • Microbial/Disinfection By-Products Rules (M/DBPR) • Long-term 2 Enhanced SWTR • Lead and Copper Rule • Waterworks Standards • Cross-connection Control Regulations (Title 17) 4

  5. 2nd Annual CalDesal Conference - 2013 Assumptions 2 • Brackish water and seawater exceeding secondary short-term MCL for: • TDS, 1,500 mg/L • Specific conductance, 2,200 mS/cm • Sulfate, 600 mg/L • Chloride, 600 mg/L • Primary desalination component: membrane (RO, NF) 5

  6. 2nd Annual CalDesal Conference - 2013 Source Evaluation • Conduct watershed sanitary survey (Section 64665, Title 22) • Identify all sources of actual or potential contamination, including biotoxins • Ocean outfalls, surface water outlets, harbor facilities, sewage pump stations • Describe watershed management strategies • e.g., control measures to prevent dumping of wastes from boats in harbors • Recommend appropriate levels of reduction of Crypto, Giardia and virus • Must be updated every five years 6

  7. 2nd Annual CalDesal Conference - 2013 Source Evaluation 2 • Detailed characterization of watershed for pathogen control is not necessary if plant design is based on worst case scenario • SWTR Minimum: 2-log Crypto, 3-log Giardia, 4-log virus • Requires additional 2-log G/V removal and inactivation • Worst case: 5.5-log Crypto, 5-log Giardia, 6-log virus • Sand City & Carlsbad Designs • Ocean modeling may be necessary 7

  8. 2nd Annual CalDesal Conference - 2013 Source Evaluation 3 • Determination of pathogen reduction requirements: • Total Coliform and E. coli/fecal Coliform monitoring • Daily monitoring to capture tidal, seasonal and storm influence • Wastewater disinfection for discharges affecting marine sources • At least 2.2-secondary treated effluent • For beach wells, Cryptosporidium removal credit could be granted for riverbank filtration 8

  9. 2nd Annual CalDesal Conference - 2013 Alternative Filtration Technology Approval • Section 64653 (f), Title 22: • Demonstrate minimum of 2-log Crypto, 2-log Giardia, 1-log virus removal and • Meet turbidity performance standard: • ≤ 0.1 NTU in 95% of measurements each month • Not exceed 1.0 NTU at any time • Not exceed 0.5 NTU in more than two consecutive samples • RO membranes that have not been accepted as an alternative filtration technology will be granted pathogen removal credit equal to log TDS reduction (rounded down to nearest whole number) 9

  10. 2nd Annual CalDesal Conference - 2013 Alternative Filtration Technology Approval 2 • Multiple Barrier Treatment SWTR, e.g. Minimum of 0.5-log Giardia & Virus (baseline WQ scenario) • No bypass or provision for blending raw water with treated water allowed 10

  11. 2nd Annual CalDesal Conference - 2013 Considerations • Monitoring for specific conductance of each RO unit or bank of units • Set triggers for alarm and automatic unit shutdown • Establish relationship between conductivity and TDS • MIT: Direct and Indirect Integrity Testing 11

  12. 2nd Annual CalDesal Conference - 2013 Considerations 2 • Waterworks Standards • ANSI/NSF 60 certification of all chemicals • ANSI/NSF 61 certification of all components • Provisions for corrosion control (Lead and Copper Rule) • Next round of lead and copper monitoring include sample sites representing the area served by the desalination plant • Cross-connection Control Regulations in Title 17, e.g. Brine disposal system, Finished Water Overflow/Drain, etc. 12

  13. 2nd Annual CalDesal Conference - 2013 Permitting Process • Domestic Water Supply Permit • Submit a permit application • Prepare the permit technical report (by an engineer) • Plans & Specifications • Draft operations plan • Document CEQA compliance http://www.cdph.ca.gov/certlic/drinkingwater/Pages/ERU.aspx • Comply with TMF Requirements (for new systems) • Contact CDPH and discuss plans ASAPhttp://www.cdph.ca.gov/programs/Documents/DDWEM/OriginalDistrictMapCDPH.pdf 13

  14. 2nd Annual CalDesal Conference - 2013 Permitting Process 2 • Permit Technical Report • General water system information • Source water information • Watershed Sanitary Survey • Treatment and design information • Alternative Technology Approval • Distribution system information • http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Permits.aspx 14

  15. 2nd Annual CalDesal Conference - 2013 Contact Information • Sean.Sterchi@cdph.ca.gov • (619) 525-4159 • http://www.cdph.ca.gov/programs/Pages/DWP.aspx 15

More Related