chloride treatment using hollow fiber supported liquid ...€¦ · 2 “ “ develop an ... ii. the...
TRANSCRIPT
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Chloride Treatment using Hollow Fiber Supported Liquid MembranesEUROPEAN PROJECT SEMESTER 2013
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The Team
Tobias Slusarek, Germany
Markus Hofmeister, Germany
Rafal Madaj, Poland
William Strömbäck, Finland
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Develop an alternative desalination technique for the Abrera drinking water treatment plant.
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Explore the working principle
Up-scale it to industrial use
Compare the technique to conventional ones
competitivetechnology
eco-nomics
Chem-istry
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Table of Contents
I. Water ShortageII. The need for an alternative techniqueIII. Hollow Fiber Supported Liquid Membranes
I. Working principleII. Experimental part and results
IV. Up-scaling to industrial useV. PerspectivesVI. Conclusions
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Water Shortage – The General Problem
The demand for fresh water constantly increases
More than 1.3 billion people are suffering from water shortage
The main cause is the growing world’s population
Three basic approaches to solve the problem
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I. Water ShoI. Water Sho
http://wewastetime.files.wordpress.com/2010/06/agbardesert.jpg
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Salinity
Content of dissolved salts
Maximum chloride concentration set by the EU is 250 mg/l (98/83/EC)
Exceeding this limit would cause a bad taste and a higher corrosion rate
El Llobregat has a chloride concentration between 300mg/l and 500mg/l
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I. Water Sho
0
100
200
300
400
500[Cl-], mg/l
Chloride contamination
EU standard El Llobregat
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The need for an alternative technique
Reverse osmosis Electrodialysis reversal
Driving force
Pressure Electric potential gradient
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Hollow Fiber Supported Liquid Membranes as an energy-saving
alternativeII. The need for an alternative tech
High energy consumption
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Hollow Fiber Supported Liquid Membranes
Hollow fiber Supported liquid membranes
Pores filled with an organic liquid containing carrier molecules (Aliquat® 336)
Barrier between two aqueousphases
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III. Hollow Fiber Supported Liquid Membhttp://www.pall.com/images/Graphic-Arts/crossflow_filtration_figure9.jpg
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Transport process
Heat transfer
Extraction
Diffusion
Stripping
chloride ions transfer
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III. Hollow Fiber Supported Liquid Memb
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• Determination of the equilibrium constant
• Aliquat® 336 preparation
• Determination of the equilibrium constant
• Aliquat® 336 preparation
Aliquat® 336washing
• First impression of the technique
• Determination of the diffusional transport constant
• First impression of the technique
• Determination of the diffusional transport constant
Flat sheetmembranes • Desired continuous
process
• More complex
• Desired continuous process
• More complex
Hollow fibers
Investigation strategy 10
III. Hollow Fiber Supported Liquid Memb
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Experimental set-up
[Cl-] initial ≈ 600 mg/L
Vfeed >> Vstripping
Chloride evolutionmeasured
Different Aliquat® 336 concentrations
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III. Hollow Fiber Supported Liquid Memb
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Results of the HFSLM - experiment 12
III. Hollow Fiber Supported Liquid Memb
EU standard
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Achievements
Effectiveness proved
Determination of mostefficient operatingconditions
Very general MATLAB model for up-scaling
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III. Hollow Fiber Supported Liquid Memb
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Up-scaling process 14
IV. Up-scaling to industr
Agència Catalana de l' Aigua. Planta dessalinitzadora de la conca del Llobregat. Generalitat de Catalunya, 2009.
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Current treatment steps
Pretreatment Desalination
Electrodialysis Reversal (8 Modules) Splitted flow
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IV. Up-scaling to industr
Technologies, GE Power & Water - Water & Process. Trihalomethanes (THM) Precursor Reduction of Surface Water by EDR Technology: Abrera Drinking Water Treatment Plant, Barcelona Spain. General Electric Company, 2010.
Possible replacement
by HFSLM
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Technical questions
Split the flow or treat all 4m3/s ? Concurrent or countercurrent flow? What are best flow conditions? What concentration of bicarbonate should be used?
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IV. Up-scaling to industr
Concurrent flow Countercurrent flow
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Economic aspects
Number of modules Pumping system Bicarbonate concentration
The price we pay is not a production price!
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IV. Up-scaling to industr
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Results
35556 modules
arranged paralelly
treating 4m3/s incountercurrent flow
Subject PriceModules 534 mil €
Electricity per year 600 000 €Sodium bicarbonate
for 1st year 30.5 mil €
Sodium bicarbonate for next year 3.9 mil €
Cleaning costs for 1m³ of stripping phase 0.058 €
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IV. Up-scaling to industr
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Comparison with competitive techniques
0,139 €
0,059 €
0,020 €
0,000 €
0,020 €
0,040 €
0,060 €
0,080 €
0,100 €
0,120 €
0,140 €
0,160 €
RO EDR HFSLM
Electricity costs to produce 1m3 of clean water
0,270 €
0,230 €
0,263 €
0,000 €
0,050 €
0,100 €
0,150 €
0,200 €
0,250 €
0,300 €
RO EDR HFSLM
Overall costs of producing 1m3 of clean water
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IV. Up-scaling to industr
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Summary
Lower electricity andmaintenance costs
Better quality of water due to bicarbonate addition
High equipment purchase costs
Cost efficient only downto 200 ppm of [Cl-]
Requires additional support from competitive technique
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IV. Up-scaling to industr
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Improvement potential
Economy of scale
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V. Perspe
0,00
0,05
0,10
0,15
0,20
0,25
0,30
RO EDR HFSLM
Estimated costs for 1m³ of cleaned water
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Improvement potential
Developing special membranes for desalination
Investigations on other counter ions
Technique almost unexplored
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V. Perspe
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Further investigations
Up-scale or down-scale Clean only drinking water
Explore the functionality for higher chlorideconcentrations New markets like China or India
Long-term study about Aliquat® 336 side effects
Aliquat® 336 is really harmful for all kinds of living organisms
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V. Perspe
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Conclusions
The Hollow Fiber Supported Liquid Membrane technique
works
Competitive to other techniques
The energy consumption is even less sustainable!
It is possible to use this technique without electricity
The implementation costs have to be reduced
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VI. Conc
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Thank you for your attention.
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