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HomeMy WebLinkAbout07.a.1) (Handout) Update on nutrient studiesNutrient Facility Plan Site Characterization Proposed Nutrient Watershed Permit Dana Lawson, Senior Engineer June 6, 2013 Central Contra Costa Sanitary District Background: 2012 Permit Suisun Bay Nutrient Studies • In progress Treatment Plant Studies ,,'Work Plan Jul 2012 • Facilities Plan & Site Characterization Report Feb 2014 • Reassessment of ammonia limits Apr 2015 — 5,500 kg /day, 65 mg /L (monthly average) 7-0. /) ma',Va4r) 1 Work Plan Components Elements: 1. Existing plant optimization for ammonia removal to meet potential interim limits. 2. Nutrient removal facilities plan to meet potential long -term limits. 3. Site characterization for contaminated soil in surcharge area. Facility Plan Site Characterization Work Plan June 2012 Element 1: Plant Optimization 1. Biowin — Develop model for treatment processes. ✓ Complete 2. Optimization - Investigate candidate operational and facilities modifications to optimize ammonia removal. • In progress, final report from Carollo by August. 3. Pilot or Full Scale Tests (optional) • Will be identified but not undertaken before report to Regional Board in Feb 2014. 1� �4 i 2 Element 1: Plant Optimization cont'd 4. Primary Sedimentation Baffle Study - Analyze effectiveness of baff les to reduce cBOD demand. • In progress - Waiting for maintenance evaluation. . • Preliminary Results - -7% more concentrated sludge in baffled tank - -4% lower BOD load to aeration process - - $135k/yr in energy /aeration costs - Recent bid was $370k for remaining 3 sets of baffles... simple payback less than 5 years 4 Element 1: Plant Optimization cont'd 5. Cyanide Study — Determine site - specific nitrification rate & cyanide inhibition. • In progress - Field work completed May 27 - Waiting for lab results - HDR will analyze data 3 Element 2: Facility Plan Evaluate conventional & emerging technologies to remove ammonia and total nitrogen for potential final effluent limits based on Sac Regional & Stockton NPDES permits. Ilk Element 2: Facility Plan cont'd 1. Total Nitrification Study ✓ 2010 report recommended extended aeration. 2. Visioning Plan - Evaluate cutting -edge nitrogen removal technologies (including site visits) • In progress - Received site visit report from HDR. - Majority of research completed. 3. Pilot Studies (optional) • Will be identified but not undertaken before report to Regional Board in Feb 2014. . A 0 Element 3: Site Characterization Evaluate soil in surcharge area for placement of additional facilities, including remediation costs and options r ✓ Work Plan submitted to A� ` DTSC _. d . °• 0 Waiting for approval Field Work mid -June to July • Draft Report by Sept _ l yij�y /¢ •C Project Schedule Element 1 Plant Optimization Jul/ Aug 2013 Element 2 Facility Plan Oct/Nov 2013 Element 3 Site Characterization Nov 2013 Summary Report to the Regional Board February 28, 2014 0 Nutrient Watershed Permit Approach • RWQCB developed SF Bay Nutrient Strategy in December 2012. • Strategy relies on scientific studies to determine nutrient impacts & prudent management options. • Bay studies would take 5 to 10+ years. • BACWA to help fund & steer studies. • CCCSD would participate through BACWA. • CCCSD studies would be incorporated. t Potential Watershed Permit • Target issuance is April 2014. • Elements under consideration: — Participation in studies, monitoring, etc. to further the science — RWQCB to require performance based, numeric effluent limits (e.g. total nitrogen limits with possible threshold to exclude some requirements for Q >10 MGD) — Division between south and north bays (i.e. Suisun) — Evaluate how to improve existing process for nutrient removal w/ minimal upgrades — Evaluate cost of upgrades considering footprint available for ranges of treatment (e.g. nit/denit, P- removal, etc.) 1.1 Potential Watershed Permit • Target issuance is April 2014. • Elements under consideration: Participation in studies, monitoring, etc. to further the science — RWQCB to require performance based, numeric effluent limits e.g. total nitrogen limits with possible threshold to exclude some requirements for Q >10 MGD) — Division between south and north bays (i.e. Suisun) — Evaluate how to improve existing process for nutrient removal w/ minimal upgrades — Evaluate cost of upgrades considering footprint available for ranges of treatment (e.g. nit/denit, P- removal, etc:) Potential Watershed Permit Target issuance is April 2014. Elements under consideration: 'Participation in studies, monitoring, etc. to further the science — RWQCB to require performance based, numeric effluent limits (e.g. total nitrogen limits with possible threshold to exclude some requirements for Q >10 MGD) — Division between south and north bays (i.e. Suisun) 'Evaluate how to improve existing process for nutrient ----------- removal w/ minimal upgrades Element 1 — Evaluate cost of upgrades considering footprint available for ranges of treatment (e.g. nit/denit, P- removal, etc.) a m� �% Potential Watershed Permit Target issuance is April 2014. Elements under consideration: AParticipation in studies, monitoring, etc. to further the science — RWQCB to require performance based, numeric effluent limits (e.g. total nitrogen limits with possible threshold to exclude some requirements for Q >10 MGD) — Division between south and north bays (i.e. Suisun) Evaluate how to improve existing process for nutrient --- - - - - -- removal w/ minimal upgrades Element 1 ' •--------------- - - - - -= 'Evaluate cost of upgrades considering footprint available N, for ranges of treatment (e.g. nit/den it, P- removal, etc.) --------------------- Element 2 Potential Watershed Permit • Target issuance is April 2014 • Elements under consideration: 'Participation in studies, monitoring, etc. to further the science RWQCB to require performance based, numeric effluent 1: limits (e.g. total nitrogen limits with possible threshold to exclude some requirements for Q >10 MGD) — Division between south and north bays (i.e. Suisun) ,Evaluate how to improve existing process for nutrient ----------- removal w/ minimal upgrades Element 1 •--------------- - - - - -- ''Evaluate cost of upgrades considering footprint available for ranges of treatment (e.g. nit/denit, P- removal, etc.) ---------- - - - - -- - -- Element 2 M. 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