arsenic removal process for drinking water production: benefits … · 2016-04-20 · more...
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Arsenic Removal Process for Drinking Water Production: Benefits of R-SiC Microfiltration Membranes
February 4th, 2016
Membrane Technology Conference and Exposition San-Antonio, Texas, USA
A. Vincent1, N. Elkhiati2, R. Neufert3, M. Moeller3,
D. Ragazzon4, M. Santalucia4, R. Bausani4
1Saint-Gobain, CREE, Cavaillon, France 2 Saint-Gobain Ceramics Materials, Les Miroirs, Paris, France
3Saint-Gobain IndustrieKeramik, Rödental, Germany 4Gruppo Zilio, Italy
Presented by: Adrien VINCENT
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Ou
tlin
e
Saint-Gobain Group / Gruppo Zilio
R-SiC membranes for liquid filtration
Application tests
Conclusions
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Ou
tlin
e
Saint-Gobain Group / Gruppo Zilio
R-SiC membranes for liquid filtration
Application tests
Conclusions
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SAINT-GOBAIN, ONE OF THE WORLD’S TOP 100 LEADING INDUSTRIAL CORPORATIONS
Sustainability – a cornerstone
41.1 €bn Sales (2014)
Sold in 2015
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INNOVATION AT SAINT-GOBAIN
5
sold today by Saint-Gobain did not exist 5 years ago More than
patents in 2014
cross-business
R&D centers
*Source: Thomson Reuters
One of the
most innovative
companies in the world*
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SAINT-GOBAIN EXPERIENCE IN SILICON CARBIDE MATERIALS
Vertical Integration of SiC - a key Differentiator: Manufacturing
SiC, Processing of raw materials, Structure - property control of
SiC
Porous SiC ceramics ● Crystar®: Recrystallized SiC (RSiC)
● Advancer® Annasicon® RTH: Nitride bonded SiC (NSiC)
● Oxide bonded SiC
Dense SiC ceramics ● Silit®: Reaction bonded, infiltrated (SiSiC)
● Hexoloy®: Directly sintered (SSiC)
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Gruppo Zilio
EPC WATER
PRODUCTS
RECENT EPC
Livorno (Boron) - 350 l/s.
Latina (Arsenic) - 360 l/s. Latina (Arsenic) - 340 l/s.
Biggest Boron removal plant of the world.
First and second biggest Arsenic removal plants in Europe.
Filter masses:
- IRON OXIDE-HYDROXIDE for Arsenic removal
- ION EXCHANGE RESIN for Boron removal
- HYDROXYLAPATITE for Fluorides removal
Design and Construction of water treatment plants.
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Ou
tlin
e
Saint-Gobain Group / Gruppo Zilio
R-SiC membranes for liquid filtration
Application tests
Conclusions
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RECRYSTALLIZED SILICON CARBIDE
Material consolidated at high T (> 2200°C) through sublimation of fine SiC
particles that condense at large SiC grains boundaries
Pure (>99%), strong SiC grain boundaries
● High temperature stability and good thermal shock resistance
● Chemical stability (pH 0 to pH 14)
● High corrosion resistance for harsh chemical cleaning
High porosity structure (OP > 40%) high flux
Weak organic matter adsorption low reversible and irreversible fouling
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SAINT-GOBAIN R-SiC MEMBRANES
Membrane Pore size = 250-1000 nm
Carrier Pore size = 5-30 µm
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FILTRATION
SG SiC membranes
250 nm – 3 µm
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DEAD-END VS CROSS-FLOW SiC FILTERS
Higher compactness
Lower energy consumption
(only 1 pump)
More sensitive to cleaning
operations
Light fouling water, e.g.
swimming pools and drinking
water
Self-cleaning action from axial
flow
Water with high solid loadings
Higher energy consumption
(recirculation pump)
Hard fouling water, e.g.
produced water and industrial
wastewater
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Ou
tlin
e
Saint-Gobain Group / Gruppo Zilio
R-SiC membranes for liquid filtration
Application tests
Conclusions
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ARSENIC REMOVAL PROCESS FOR DRINKING WATER PRODUCTION
ESTIMATED RISK OF ARSENIC IN DRINKING WATER
(based on hydrogeological conditions) WORLDWIDE CONCERN
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Overall Zilio’s process description:
ARSENIC REMOVAL PROCESS FOR DRINKING WATER PRODUCTION
After MF: As < 10 μg/L
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SiC filter with 600 nm membrane at 11 m² in dead end vacuum mode: ● Arsenic removal efficiency 98% (permeate at 2 µg/L)
● Permeate flow rate average at 500 LMH
● TMP (Trans-membrane pressure) as a function of filtration time
- Up to 500 mbar for 10 min of filtration
- Up to 700 mbar for 20 min of filtration
● Backwash efficiency
- Systematic initial flow rate recovery over 8 h of filtration no irreversible fouling encountered
- Backwash water consumption: around 1% of the filtrated water
ARSENIC REMOVAL PROCESS FOR DRINKING WATER PRODUCTION FIELD TESTING
Flow rate evolution for 20 min of filtration
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ARSENIC REMOVAL PROCESS FOR DRINKING WATER PRODUCTION LAB TESTING
SiC filter with 600 nm membrane at 1.9 m² in dead end pressurized mode: ● Flocculent content increasing by 2.5 to simulate stronger fouling properties
- Iron removal efficiency 99.7%
● Filtration time: ~20 h
● Permeate flow rate average at 600 LMH
● TMP from 100 mbar up to 350 mbar
● Turbidity at 1.5 NTU with pics at 6-8 NTU during few seconds just after BW
● Backwash every 10 minutes
- Systematic initial flow rate recovery over 24 h of filtration no irreversible fouling encountered
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Ou
tlin
e
Saint-Gobain Group / Gruppo Zilio
R-SiC membranes for liquid filtration
Application tests
Conclusions
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CONCLUSIONS
Saint-Gobain – Extensive Investments in: ● Developing application expertise in water filtration
● Optimizing membrane designs
● Expanding testing of membranes across multiple industries
Drinking water ● Saint-Gobain R-SiC dead-end filters used as part of Zilio’s process
● Very good Arsenic removal efficiency (98%) demonstrated in the field
● Large and stable permeate flow rate (~500-600 LMH) demonstrated in the field and in the lab under more stringent conditions
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Thank You
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R-SiC AS A MEMBRANE MATERIAL
Controlled porosity high flux
Chemical stability (pH 0 to pH 14)
High corrosion resistance for harsh chemical cleaning
Weak organic matter adsorption for low reversible and irreversible
fouling
Separation and Purification Technology 79 (2011) 365-374