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Microfiltration / Reverse Osmosis The 1-2 Punch for Water Treatment Presented by: Don Burgess DWG Process Supply Ltd.

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Presentation on theme: "Microfiltration / Reverse Osmosis The 1-2 Punch for Water Treatment Presented by: Don Burgess DWG Process Supply Ltd."— Presentation transcript:

1 Microfiltration / Reverse Osmosis The 1-2 Punch for Water Treatment Presented by: Don Burgess DWG Process Supply Ltd.

2 CLOTH & DEPTH FILTERS R A N G E S O F F I L T R A T I O N P R O C E S S E S MEMBRANETYPE RELATIVE SIZE OF COMMON MATERIALS REVERSE OSMOSIS NANO- FILTRATION ULTRAFILTRATION MICROFILTRATION SCREENS & STRAINERS LATEX EMULSIONS METAL IONS VIRUS VOC’S, PCD, SUSP. OIL AQUEOUS SALTS ATOMIC RADII PROTEINS/ENZYMES OIL EMULSIONS PAINT PIGMENT BACTERIA HUMAN HAIR SAND RED BLOOD CELLS CARBON BLACK DISSOLVED ORGANICS PARTICLE SIZE 10 -4 10 -3 10 -2 10 -1 1.0 10 10 2 10 3 (MICRONS) APPROXIMATE 100 200 20,000 500,000 APPROXIMATE 100 200 20,000 500,000 MOLECULAR WT. MOLECULAR WT. PARTICLE SIZE 1 10 100 1,000 10,000 100,000 10 6 10 7 (ANGSTROMS) Cryptosporidium Oocyst Giardia Cyst Material Sizes Source: GE Water

3 Filtration Processes Microfiltration / Ultrafiltration Removes turbidity Provides barrier to Crypto/Giardia Backwashable “Surface Water” “Spaghetti removes Solids” Reverse Osmosis / Nanofiltration Removes dissolved compounds Typically can not backwash Fouled by turbidity “Ground Water” “Layered removes Liquids”

4 Microfiltration

5 Membrane Pore Sizes – 0.01 to 0.2 micron Pencil Dot (40 µm) Giardia Cyst (5 - 11 µm) Large Siliceous Particle (20 µm) Cryptosporidium Oocyst (2 - 5 µm) [Anthrax Spore] Typical Bacterium (0.2 µm) E-Coli (.45 µm) How Small is Small?

6 Why Microfiltration? Turbidity and Microbiology removal with no chemistry –Turbidity < 0.1 NTU 0.02 to 0.04 NTU –Cryptosporidium > 99.9999% Removal –Giardia > 99.9999% Removal TOC / Colour removal –Chemical precipitation –Coagulation with Alum / acid / PAC –Removal of precipitate with membrane

7 Inlet Section Source: Pall Canada Pressure Membranes MF Fiber = 0.1 micron PVDF - Oxidant Resistant (Chlorine, Ozone & Chlorine Dioxide) Outside – In Rack Mounted Vertically

8 Source: www.zenonenv.com Immersed Membranes UF Fiber = 0.035 micron Composite Outside – In Vacuum Mounted in Below or Above Grade Tanks

9 How the Pressure System Works Microza ® hollow fiber systems have three modes of operation: FiltrationFiltration RegenerationRegeneration Clean-In-Place (CIP)Clean-In-Place (CIP)

10 Forward Water ProductionFiltrate Feed Pump Excess Recirculation MF/UFModule

11 Reverse Filtration MF/UFModule Pump Filtrate To Drain Chlorine Optional

12 Why Reverse Filtration? TMP Time Longer cycle with Reverse Filtration TMP increases with time

13 Clean-In-Place (CIP) Chemical wash of the membranes to remove foulants and restore flow capacity. –Chlorine and caustic – Remove organics –Citric acid – Remove inorganics

14 Source: Pall Canada Pressure System (35 MLD - Pall)

15 Source: www.zenonenv.com Immersed Wastewater System (Zenon)

16 Town of Whitecourt 4.8 to 16 MLD 1 of 2 valve racks Ultimate capacity of 16 MLD Dummy modules for startup Initial installed modules for 4.8 MLD

17 Modular System 1.3 to 2.0 MLD

18 Nobleford Pilot Raw water 2 to 7 NTU 3 mg/L TOC Treated Water < 0.1 NTU 0 to 1 particles 50% TOC red.

19 Vernon Pilot Turbidity < 0.1 NTU Particle counts – 0 to 1 Successful operation w/o pretreatment 65% TOC red. w/ pretrtmnt

20 MF Test Results Site 1Site 2Treated Water Raw Water Turbidity (NTU)1 to 710 to 25<0.02 TOC (mg/L)9 to 1110 to 154 to 6 Colour (TCU)5 to 4023 to 40< 5 Chemical Dosages Alum (mg/L)10075 to 100 PAC (mg/L)1013

21 MF Membrane Technology Benefits Exceeds Environmental Treatment Standards Consistent treatment quality Modular, Compact and Cost Saving System Configurations Some Membranes Warranted for 10 Years Automatic Integrity Testing On-Line Technical Support and System Diagnosis

22 Reverse Osmosis / Nanofiltration

23 RO / Nano filtration Removes dissolved compounds Non-backwashable Max 0.5 to 1 NTU Max SDI = 3.0 “Ground Water” “Layered removes Liquids”

24 Applications Ground water treatment TDS Hardness Metals such as arsenic GWUI Surface water Organics

25 Pre-Treatment for Nano/RO Nano / RO Concentrate Pre-Filtration for Solids Removal Pre-Oxidation for Iron/Mg Removal Microfiltration Raw Water SDI < 3 Raw Water Pre- oxidation Filtration Nano / RO Concentrate Permeate

26 Pre-treatment Required Cartridge Filters (5 micron) Antiscalant (chemical) As Needed Multi Media Filtration (Iron Removal) MF/UF (suspended solids, turbidity)

27 Post-Treatment Required pH adjustment (caustic, lime) Disinfection As Needed Degasifier

28 RO or Nano Reverse Osmosis Low energy membranes provide high efficiency removal Removes 97 to 99% of all dissolved compounds Blend w/ raw water to meet guidelines and restabilize treated water Nanofiltration Removes 60 to 80% of dissolved compounds Use for GWUI as treat entire flow stream “Softening” filter Specially formulated membrane to resist organic (TOC) fouling

29 Pros and Cons Pros Ease of operation Superior water quality Reduced footprint Membrane elements are standardized Modular units Cons Higher energy costs High waste volumes – 60 to 80% recovery

30 System Operation Feed water boosted to approx 175 psi to drive flow through membranes Water is clarified as it passes through membrane to produce “permeate” Rejected compounds are concentrated in waste water referred to as “concentrate” Run at one flow rate – “On/Off” operation

31 Flow Schematic

32 Feed Water Conditions Pressure - 30-60 psi Turbidity - <1 NTU Silt Density Index - <4 for 15 minute test

33 Design Considerations Pretreatment –SDI –Hardness –Iron / Manganese System Recovery –Keep compounds within saturation limits –Antiscalants

34 Full Scale Systems

35 Meander River – 800 m 3 /D Blending 80% RO permeate with 20% raw water Reducing TDS from 2000 to 500

36 1,630 M 3 /Day

37 Pilot Testing Treating surface water for TOC reduction Slow sand filtration pretreatment Reducing TOC from 10.5 mg/L to <0.5 Key issue – minimize organic fouling of membrane

38 Is It Worth It? RO/Nano provides specific function Often replaces 2 or 3 other processes Sometimes the only process that will work It is worth looking after your system

39 Process Applications

40 Remember Microfiltration / Ultrafiltration “Surface Water” Turbidity and particle removal Crypto/Giardia barrier Backwashable “Spaghetti removes Solids” RO / Nano “Ground Water” Dissolved compound reduction Do not even think of backwashing “Layered removes Liquids”

41 Contaminants Surface Water Turbidity Crypto/Giardia Iron/Mang/Arsenic Organics Hardness Ground Water TDS Hardness Iron/Mang/Arsenic Organics Turbidity

42 Treatment Options ContaminantConventional Process Membrane Process TurbidityFloc/Coag/Clarifier /Filter MF Crypto/GiardiaFloc/Coag/Clarifier /Filter MF Iron/Mang/ArsenicChem Precip / Mang Greensand Chem Precip and MF or RO HardnessLime softng/Recarb / Filter RO OrganicsOxidation and GACRO TDSNot readily availableRO

43 System Assessment Look at compounds that are process dependant, and then add other processes as required for remaining compounds

44 Surface Water ContaminantMembrane Process TurbidityMF Crypto/GiardiaMF Iron/Mang/ArsenicMF + Chem Precip HardnessMF + RO OrganicsMF + Enh Coag, or RO

45 Ground Water ContaminantMembrane Process TDSRO Iron/Mang/ArsenicRO or Chem Precip +MF HardnessRO OrganicsRO TurbidityMF GUDIMF

46 Treatment Quality Turbidity Crypto/Giardia Iron/Mang/Arsenic Organics Hardness TDS < 0.1 NTU Avg 1 to 4 particle counts Below guideline limits < 2 mg/L < 100 < 500

47 1. MF Feed to NF for Organics Process Flow River water Upflow clarifier Microfiltration Nanofiltration for organics reduction

48 Results - MF to NF for Organics ParameterRaw Water Clarifier Effluent MF Perm NF Perm TOC (mg/L)13.13.53.6<0.5 Iron (mg/L)0.32<0.06 Manganese (mg/L) 0.0390.0770.076<0.004 TDS120170160<10 Hardness (mg/L)96110 <0.5

49 2. MF-NF for Organics Redn River water source Sedimentation clarifier Microfiltration Transfer tank NF for organics reduction

50 Results – MF-NF for Org Redn ParameterRaw Water MF Feed MF Perm RO Perm Turbidity24.50.010 TDS255263264149 Hardness19817619588 TOC15.612.312.00.05

51 3. MF-NF for Turb, Organics, Hardness Process Flow River water Raw water pond Microfiltration for turbidity reduction and crypto / giardia barrier Nanofiltration for organics / hardness reduction

52 Results - MF to NF ParameterRaw Water MF PermNF Perm TOC (mg/L)15.812.4<0.1 Turbidity (NTU)0.860.02<0.1 Manganese (mg/L)0.005 <0.002 TDS751749<5 Hardness (mg/L)5275301.0

53 Summary The 1-2 Punch of MF / RO’s, can treat most common contaminants in water. Reduced number of processes, generally results in smaller footprint. Effluent quality from membrane treatment is consistent.

54 Questions


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