Trials and Tribulations of Building a Pilot Plant:

Transcription

1 Trials and Tribulations of Building a Pilot Plant: Tackling Water Quality Challenges Suez Water New York Gerry Remsen, PE & Elsie Kitcher, PhD NYSAWWA Spring 2017 Saratoga, NY

2 Outline LDF Plant Challenges Solution Pilot Plant 2 I

3 Lake DeForest Plant Reservoir 5.6 billion gallons LDF WTP 20 MGD Process Dissolved air flotation Dual-media filtration Free chlorine disinfection Residuals Equalization lagoons Drying beds System ~300,000 people 60 wells 1000 miles pipe 3 I

4 Challenges 4 I

5 Turbidity & Total Organic Carbon Turbidity 3-12 NTU Manganese ppm Algae Dissolved Oxygen - Anoxic Conc. (ppm) 1.2 Mn - Raw Nov-11 Jun-12 Jan-13 Aug-13 Mar-14 Oct-14 May-15 TOC Increasing 4-9ppm TOC (mg/l) Jan-12 May-13 Sep-14 Feb-16 5

6 Algal Blooms (Blue-green) Coelosphaerium Pseudanabaena Anabaena Aphanocapsa Oscillatoria Merismopedia Aphanizomenon Phormidium 6

7 Taste & Odor (2016) Geosmin MIB 300 Conc. (ug/l) Jul 19-Aug 9-Sep 30-Sep 21-Oct 11-Nov 2-Dec 7 I

8 Chlorine Dose Vs Ammonia Dose (mg/l) Conc. (mg/l) Oct-08 Mar-10 Jul-11 Dec-12 Apr-14 Sep-15 Jan-17 Cl2 Dose NH3-N 8 I

9 Total Trihalomethanes Conc. (ug/l) Nov-07 Nov-08 Nov-09 Nov-10 Nov-11 Nov-12 Nov-13 Nov-14 Nov-15 THM4 (ug/l) HAA5 (ug/l) 9 I

10 Solutions 10 I

11 Management Process optimization Reservoir Monitoring - In-situ & discrete - Nutrients - Phytoplankton Treatment Secchi Depth (m) Apr 1-Jun 11-Jul 20-Aug 29-Sep 8-Nov Operator skill 11 I

12 Chlorine Residual Vs THM (2016) Cl2 Conc. (mg/l) Jun 29-Jul 28-Aug 27-Sep 27-Oct 26-Nov 26-Dec THM Conc. (mg/l) Filter eff TTHM Conc 12 I

13 THMs - LRAA Feb-13 Aug-13 Feb-14 Aug-14 Feb-15 Aug-15 Feb-16 Aug-16 THM4 HAA5 13 I

14 Pilot Plant 14 I

15 Scope Goal Explore and Assess treatment options - Improve reliability - Water quality - Regulatory compliance Capacity gpm Location LDF WTP Operational 10 months temperatures (34 80 ⁰ F) 15 I

16 Siting Implemented in current footprint No new buildings Perry House Access to raw water source Return water to head of plant Sludge to frac tank Gravity filter - 8ft of head. Abatement Parking lot Ozone shed DAF Trailer 16 I

17 Site Plan 17 I

18 Pilot Plant Schematic 18 I

19 Pilot in Pictures 19

20 Testing Protocol Temperature Raw water Raw water Raw water Raw water Cold (32 50 O F) Pre Ozone Warm (50-70 O F) DAF Pre Ozone DAF DAF Hot (>70 O F) Alum / PACl / FeCl 3 DAF Inter. Ozone Inter. Ozone Filters Filters Filters Filters UV 20 I

21 Raw Water KnMO4 at intake Cost benefit analysis Feasible Long supply line (380 ft) vs relocate KnMO 4 feed Raw water intake was tapped up stream at the Howell bunger valve at the dam. 21 I

22 Materials Selection Criteria Does not react with ozone Proven track records Readily available Reasonable price Piping HDPE - 2 (50ft and 30ft in length) 16in ID SCH80 PVC 1.5in stainless steel HDPE underground and PVC above grade 22 I

23 Insallation & Power Insallation Fiber glass with PVC jacketed Pipe chases Closed cell spray polyurethane foam (SPF) SUEZ s safety goals Egress platform and a skirt built around the DAF trailer. Electrical power 200 amp 480 volt Electrical conduit and wiring Equipment electrical requirements Europe vs US 480/230/208/120 volts and 60 hertz. 23 I

24 Conclusion Investigate innovative ideas Time and space constraints. Design of improvements water quality challenges Innovative design can help overcome the challenges presented by physical constraints while still achieving results in a cost effective manner. 24 I

25 THANK YOU!!! QUESTIONS?