1 Environment & Water Industry Development Council (EWI) Building Singapore as the Global Hydrohub EWI Workshop for Technology Roadmaps Dec 07 Environment & Water Industry Development Council (EWI) Building Singapore as the Global Hydrohub Technology Roadmap Why Technology Roadmaps • Drive and direct targeted R&D areas (directed R&D) • Develop R&D capabilities • Develop local water technologies First 2 Roadmaps to roll-out: - Bio-processes Technologies (BT) - Chemical & Redox Technologies (CRT)
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EWI Workshop for Technology Roadmaps Technology Roadmap... · Technology Roadmap Why Technology Roadmaps ... activated sludge processes ... • Biomass is exposed to cyclic aerobic,
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Environment & Water Industry Development Council (EWI)
Building Singapore as the Global Hydrohub
EWI Workshop for Technology Roadmaps Dec 07
Environment & Water Industry Development Council (EWI)
Building Singapore as the Global Hydrohub
Technology Roadmap
Why Technology Roadmaps
• Drive and direct targeted R&D areas (directed R&D)
• Develop R&D capabilities
• Develop local water technologies
First 2 Roadmaps to roll-out:
- Bio-processes Technologies (BT)
- Chemical & Redox Technologies (CRT)
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Environment & Water Industry Development Council (EWI)
Building Singapore as the Global Hydrohub
Technology Scanning
Identified Technologies / Capabilities for Singapore-based entities to develop
Identify Drivers: Commercial potential Knowledge of market
Detailed Technology Roadmaps
Technology Roadmap
Academia Inputs
Environment & Water Industry Development Council (EWI)
Building Singapore as the Global Hydrohub
Technology Roadmap - Bioprocess
Technologies
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Environment & Water Industry Development Council (EWI)
Building Singapore as the Global Hydrohub
Why Biological Processes?
•• Most frequently encountered process in Most frequently encountered process in large wastewater treatment facilitylarge wastewater treatment facility
•• Largest component of a wastewater Largest component of a wastewater treatment facilitytreatment facility
•• Broad range of applications:Broad range of applications:–– Preliminary treatment for water reclamationPreliminary treatment for water reclamation
–– Energy recoveryEnergy recovery
•• Opportunities for change:Opportunities for change:–– ““LowLow”” energy systemsenergy systems
–– BiBioconversion for energy recoveryoconversion for energy recovery
–– BioBio--resource recoveryresource recovery
–– Sludge MinimizationSludge Minimization
Environment & Water Industry Development Council (EWI)
Environment & Water Industry Development Council (EWI)
Building Singapore as the Global Hydrohub
2. Cyclic 2. Cyclic MBRsMBRs
•• MBRsMBRs operated in sequential batch modeoperated in sequential batch mode
•• Biomass is exposed to cyclic aerobic, anoxic and Biomass is exposed to cyclic aerobic, anoxic and anaerobic conditionsanaerobic conditions
Potential Benefits:Potential Benefits:
•• Advantages associated with Advantages associated with MBRsMBRs, i.e. consistent and , i.e. consistent and low SS effluent quality, high organic loading rate etc.low SS effluent quality, high organic loading rate etc.
•• A possible environmentally sustainable technology for A possible environmentally sustainable technology for wastewater treatmentwastewater treatment
•• Novel anaerobic processes that can be applied to the Novel anaerobic processes that can be applied to the treatment of lowtreatment of low--strength wastewaters like domestic strength wastewaters like domestic wastewaterwastewater
Potential Benefits:Potential Benefits:
•• Net energy producing processNet energy producing process
•• Sludge minimizationSludge minimization
•• Achieve biodegradation of organic compounds that are Achieve biodegradation of organic compounds that are recalcitrant aerobically, e.g. halogenated and phenyl recalcitrant aerobically, e.g. halogenated and phenyl compounds compounds
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Environment & Water Industry Development Council (EWI)
•• Production of oxidative hydroxyl radicals in the Production of oxidative hydroxyl radicals in the presence of TiOpresence of TiO22 and energy of light, UV < 380nm. and energy of light, UV < 380nm.
Potential Benefits:Potential Benefits:•• Possibility of simultaneous disinfection, oxidative and Possibility of simultaneous disinfection, oxidative and
reductive reactionsreductive reactions
•• Complete mineralization of recalcitrant/nonComplete mineralization of recalcitrant/non--biodegradable biodegradable organics: COorganics: CO22 and waterand water
•• Minimal/no waste disposal problemMinimal/no waste disposal problem
•• Oxidation of pollutants at low/trace level (ppb)Oxidation of pollutants at low/trace level (ppb)
•• Draw on solar technology to reduce operating costDraw on solar technology to reduce operating cost
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Environment & Water Industry Development Council (EWI)
Building Singapore as the Global Hydrohub
TiOTiO22 Photocatalytic Oxidation: Current StatusPhotocatalytic Oxidation: Current Status
PUB Pilot testing (engineeringPUB Pilot testing (engineering
prospectprospect ) ) -- Reduction in
membrane fouling with the use of
TiO2
Active area of researchActive area of research- Modifications of TiO2
Environment & Water Industry Development Council (EWI)
Building Singapore as the Global Hydrohub
3. Sulphate radicals (SR)
•• Sulphate radicals ( ) possess high oxidation power, Sulphate radicals ( ) possess high oxidation power,
equivalent to hydroxyl radicalsequivalent to hydroxyl radicals
•• More stable than hydroxyl radicalsMore stable than hydroxyl radicals
•• Emerging water treatment technologyEmerging water treatment technology
−•
4SO
Oxidants
Fluorine Sulphate
Radical
Hydroxyl
Radical
Ozone Hydrogen
Peroxide
Chlorine
Oxidation
Power, V
3.0 2.5 - 3.1 2.8 2.1 1.8 1.4 2.8
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Environment & Water Industry Development Council (EWI)
Building Singapore as the Global Hydrohub
Methods to produce Methods to produce SRsSRs
1.1. Direct UV irradiation of Direct UV irradiation of peroxymonosulphateperoxymonosulphate or or monopersulphatemonopersulphate
2.2. Coupling of Coupling of peroxymonosulphateperoxymonosulphate and and monopersulphatemonopersulphate with transition with transition metal (cobalt, silver, iron)metal (cobalt, silver, iron)
Sulphate Radicals (Sulphate Radicals (SRsSRs): Current Status): Current Status
Environment & Water Industry Development Council (EWI)
Building Singapore as the Global Hydrohub
Research Requirements:Research Requirements:
- Understanding of SRUnderstanding of SR--AOP oxidation mechanismsAOP oxidation mechanisms
-- Investigate ways to catalyze formation of Investigate ways to catalyze formation of SRsSRs
-- Explore its applicability in water treatment domainExplore its applicability in water treatment domain