City of Delano: Biological Nitrate Removal Using the biottta System. June 19, 2015

Transcription

1 City of Delano: Biological Nitrate Removal Using the biottta System June 19, 2015

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3 Delano Project Summary Grant awarded April 2014 Pilot Study Phases 1-3 DWR Prop 50 (6b) Grant Design & Construction of Full-Scale Facility Operation up to 12 months Dissemination of results SWRCB CAA Grant Pilot Study Phase 4

4 Contaminant destruction is a key aspect of this technology O 2 NO 3 - ClO 4 - Cr(VI) VOCs EPS Nutrients (P, NH 3 ) Organic carbon CO 2, N 2, Cl-, Cr(III) s

5 Biologically-Tailored, Two-Stage Treatment Approach : Designed for automated operation and robust performance Backwash wastewater to settling lagoon or sewer Nutrients Reox. Polymer LGAC Well(s) Anoxic Bioreactor Aerobic Biofilter Disinfection Degas (if necessary) 1. Two-stage plug-flow biotreatment covering range of redox conditions 2. Tailored, integrated chemical feed control philosophy 3. Multi-component Backwash biomass control system 4. No proprietary parts, media, or chemicals

6 Key elements of biottta system drive applicability to rural water settings concentrated waste stream Minimal operator attention Contaminant destruction Low energy/ ops costs High water recovery Robust

7 Extensive development, optimization, & demonstration Bench-scale testing: Pilot-scale optimization 2002-present Castaic Lake Water Agency, CA (ClO 4-, NO 3- ) Western Municipal Water District, CA (NO 3-, ClO 4-, DBCP) Dept of Defense/Rialto, CA (ClO 4-, NO 3- ) Lincoln Pipestone Rural Water, MN (NO 3-, Mn) Completed 2014 Chino Basin Desalter Authority, CA (NO 3-, TCE, TCP) On going Cucamonga Valley Water District, CA (NO 3-, DBCP, Cr 6+ ) Completed 2015 City of Delano, CA (NO 3- ) On going Full-scale installations: City of Delano; construction is underway Design and construction for full-scale system at West Valley Water District anticipated in 2015 (NO 3-, ClO 4-, TCE) Construction on LPRW system anticipated in 2016 (~400-gpm system)

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9 Project Objectives Overall objective is to demonstrate that biottta is a cost-effective and sustainable solution for removing nitrate from groundwater in rural communities. 1. Demonstrate treatment efficiency and robustness (including ability to operate intermittently) 2. Demonstrate ease of operation 3. Develop costs for various system capacities

10 Project Tasks and Status Task 1 Pilot Testing Task 2 Design Task 3 Construction Task 4 Full-Scale Demo Task 5 Outreach Progress

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12 Pilot matches full-scale process flow Acetic Acid, Phosphoric Acid, Nitrate H 2 O 2 By-Pass Polymer Well Break Tank Anoxic Aeration & Aerobic Bioreactor Degas Biofilter BW Tank Sampling Locations 1. Raw (1F) 2. Bioreactor Effluent (1E) 3. Biofilter Effluent (2E) Compressor BW Pump

13 biottta skid simulates full-scale operation

14 Rapid acclimation with fresh GAC media

15 Sustained nitrate removal observed

16 biottta waste stream is low strength BOD 5 < 40 mg/l TSS < 90 mg/l VSS < 90 mg/l ph 7.5

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18 Reacclimation period not required after backwash

19 System performance not impacted by increase in raw water nitrate

20 Rapid recovery following simulated acetic acid feed failure

21 System is robust with respect to 24-hour system shut-down

22 System is robust with respect to 1-month system shut-down

23 Phase 4 Testing - Intermittent Operating Scenarios 1. 24/7 Operation (Baseline Condition) 2. On 20 hours/off 4 hours 3. On 12 hours/off 12 hours 4. On 6 hours/off 18 hours 5. On 1 week/off 1 week 6. On 100 hours/off 68 hours 7. On 45 minutes/off 15 minutes, repeated for 12 hours, then off 12 hours 8. On 30 minutes/off 30 minutes, repeated for 12 hours, then off 12 hours.

24 Steady Performance: 12 hrs on/12hrs off

25 Steady Performance: 12 hrs on/12hrs off

26 Steady Performance: Week on/week off

27 Steady Performance: 33 min on/33 min off for 12 hours, then off for 12 hours

28 Effluent has passed the on-site taste test

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30 Demonstration Facility: Design Criteria Description Criteria Well 35 Flow Rate 570 gpm biottta TM Average Flow Rate 200 gpm biottta TM Maximum Flow Rate 350 gpm Raw Water Nitrate Concentration 45 mg/l as NO3 biottta TM Target Nitrate Concentration 5 mg/l as NO3 Blended Water Target Nitrate Concentration 31 mg/l as NO3 Number of Vessels 2 Vessel Diameter 8 feet Bioreactor Media Type and Depth 48 inches GAC Empty Bed Contact Time (EBCT) at Average Flow 7.6 minutes Biofilter Media Type and Depth 36 inches GAC over 12 inches sand

31 Well 35: Existing Site biottta Pilot Structure Austin Street Existing Well 35 Valle Vista Park

32 Demonstration Facility: Site Layout Expand Site to the East Chemical Storage Existing Well 35 biottta TM Treatment Building Backwash Supply and Waste Equalization Tanks

33 Demonstration Facility Layout

34 Demonstration Facility Layout

35 Estimated O&M Costs 1. $180-$220/AF treated 2. $80-$100/AF delivered 3. Includes chemicals, power, labor

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37 Complete PCE removal observed MRL: 0.5 µg/l MDL: µg/l MRL: 0.5 µg/l MDL: µg/l

38 Complete TCE removal observed MRL: 0.5 µg/l

39 Complete 1,1-DCE removal observed MRL: 0.5 µg/l MDL: µg/l

40 Complete TCP removal observed MRL: 0.5 µg/l

41 Complete DBCP removal observed Raw Water Biofilter Eff DBCP (µg/l) MCL /16 6/25 8/4 9/13 10/23 12/2 1/11

42 Sustained Cr(VI) removal observed MRL: 0.1 µg/l

43 Summary Efficient destruction of multiple contaminants can be achieved across the system System is robust Design is modular and flexible Low operator attention required Does not generate a contaminant-laden, concentrated waste stream

44 City of Delano: Biological Nitrate Removal Using the biottta System June 16, 2015