Brian Reed Brent Hayes

Transcription

1 Sewer Odor Control Dosing Station Tiffany Pump Station Assessment City of Garden Grove Sanitary District / Orange County Sanitation District Brian Reed Brent Hayes

2 OCSD Collection Odor and Corrosion Control Program Minimize regional sewer system odor impacts to residences and businesses Reduce odor complaints from collection systems and treatment plants Extend the useful life of the regional collection assets, reduce corrosion potential Optimize and integrate odor control program in the collection system with the two treatment plants Support an active capital improvement program

3 OCSD Collection LOS Goals Collections Odor Levels of Service Goals: Number of odor complaints attributable to OCSD collections system 12 per year Collection system within 24 hour response target 100% This is achieved through specific targets of: Controlling vapor H2S levels less than 25 ppm daily average Controlling liquid phase dissolved sulfide concentrations to 0.5 mg/l based upon daily average

4 Collection System Background OCSD Collection System: 572 miles of interceptor and trunk sewer lines 15 pump stations; 8,700 manholes Collection system value: $3 billion Annual maintenance cost: ~ $30 million Chemical pretreatment: ~ $6.4 million Sewer Trunk Treatment Method Mode Miller Holder Ferrous Chloride + Ferrous Chloride Continuous Dosing Baker Main Ferrous Chloride Continuous Dosing Newport Magnesium Hydroxide + Calcium Nitrate + Calcium Nitrate Continuous Dosing Knott Magnesium Hydroxide + Ferrous Chloride + Ferrous Chloride Continuous Dosing Euclid Sodium Hydroxide Caustic Batch Dosing Santa Ana Sodium Hydroxide Caustic Batch Dosing Bushard Sodium Hydroxide Caustic Batch Dosing Newhope Sodium Hydroxide Caustic Batch Dosing SARI Sodium Hydroxide Caustic Batch Dosing Sunflower Sodium Hydroxide Caustic Batch Dosing Coast Sodium Hydroxide Caustic Batch Dosing

5 Collection Expenditures

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7 Miller-Holder

8 Miller-Holder Trunkline Miller Holder Trunkline: 25 mile long low velocity gravity sewer commencing in La Habra, terminating at Plant 2 2 dosing locations (Ferrous Chloride): (1) Buena Park (2) GGSD Tiffany (3) Midway City Sanitary District 2 downstream sampling sites to monitor/control chemical dosing : (1) Onyx/Santa Catalina (Weekly) (Vapor & Liquid) (2) Banning (Weekly) (Vapor & Liquid)

9 Miller-Holder Trunkline City of Garden Grove Sanitary District (Tiffany Pump Station) Buena Park Onyx/Santa Catalina GGSD Tiffany and Belgrave PS Midway City Banning/Magnolia

10 City of Garden Grove Sanitary District (Tiffany Pump Station)

11 Calcium Nitrate Odor Control Dosing City of Garden Grove Pump Station (Tiffany)Location Storage and Dosing Systems

12 Calcium Nitrate Storage and Dosing Systems

13 Calcium Nitrate Storage and Dosing Systems

14 Calcium Nitrate Monitor and Control Enclosure

15 Calcium Nitrate Remote Monitoring and Control

16 Electrical Service / Conduit Junction Box Conduit run, electrical service of 110 VAC, 60 HZ, 30A, terminating in a junction box within 10 feet of the dosing module location.

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19 Objectives One objective is to prove the underlying concept, the cost and operational efficacy of the program for controlling H2S and odors with injection of calcium nitrate at GGSD owned and operated Tiffany PS located in the City of Garden Grove which discharges into OCSD Miller Holder System. Another objective developed under performance will be gauged by reducing sporadic vapor H2S excursions generated from Tiffany PS and along the forcemain discharge before flows combines into the Miller Holder trunkline and downstream into Plant No. 2. achieving consistent vapor H2S levels of < 25 ppm.

20 Liquid Phase Odor Control Technologies Calcium Nitrate Prevent the formation of sulfides by providing an alternative electron acceptor for SRB. SRB preferentially reduce oxygen, nitrate, and sulfate in that order. Therefore, as long as enough oxygen or nitrate is in solution, sulfate conversion to sulfide will be minimized. Nitrate is available in both liquid and dry form as sodium nitrate (NaNO3) or, more commonly, calcium nitrate (Ca(NO3)2).

21 Baseline (No Treatment) Vapor Hydrogen Tiffany FM Discharge Vapor Range: ppm (Average: 92 ppm)

22 Vapor Hydrogen Tiffany FM Discharge: 200 GPD Nitrate 10/8 10/12 Vapor Range: 0 5 ppm (Average: < 1 ppm)

23 Tiffany Spike at FM Discharge increase calcium nitrate from 75 to 103 GPD to address spike downstream on the Miller Holder Spike at FM Discharge. increase calcium nitrate from 75 to 103 GPD to address spike downstream on the Miller Holder

24 Tiffany FM Discharge: 103 GPD Nitrate 12/5 1/2 Vapor Range: 0 4 ppm (Average: < 1 ppm) Increased Nitrate feed at Tiffany PS to address spikes downstream on the Miller Holder

25 Spikes eliminated with increase of Nitrate feed : 103 GPD Nitrate at Tiffany PS. Vapor Range: 0 16 ppm (Average: < 6 ppm)

26 Chemical Cost vs Vapor H2S ( ppm) 9/16/2016 9/18/2016 9/20/2016 9/22/2016 9/24/2016 9/26/2016 9/28/2016 9/30/ /2/ /4/ /6/ /8/ /10/ /12/ /14/ /16/ /18/ /20/ /22/ /24/ /26/ /28/ /30/ /1/ /3/ /5/ /7/ /9/ /11/ /13/ /15/ /17/ /19/ /21/ /23/ /25/ /27/ /29/ /1/ /3/ /5/ /7/ /9/ /11/ /13/ /15/ /17/ /19/ /21/ /23/ /25/ /27/ /29/ /31/2016 Chemical Usage (GPD) / Cost, $ /day Miller Holder Trunk Sewer System Graphing: September December 2016 Banning & Magnolia Monitoring Point Daily Average H2S Vapor (ppm) FeCl2 Daily Usage ( GPD) Miller Holder Upper Dean Foods Nitrate Usage (GPD) Tiffany Pump Station GGSD Cost $ per day FeCL2 Daily Usage (GPD) Lower Miller Holder Midway City Yard

27 City Garden Grove (Tiffany) System Dose Setup

28 City Garden Grove (Tiffany) System Dose Setup

29 City Garden Grove (Tiffany) System Dose Setup

30 Flow History Actual vs. Target

31 City Garden Grove (Tiffany) System Dose Setup

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