neodren filtrate water quality 2014 04 22
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Neodren® Subsea Seawater Intake
Filtrate Water Quality Compilation
April 22, 2014
©2014 Anthony T. Jones, Ph.D.
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Introduction
This compilation of water quality data is extracted from conference papers presented since 2006.
The investigation sites are in Spain.
Cala Gogo-Barcelona
La Tordera, Malgrat de Mar
San Pedro del Pinatar, Murcia
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Cala Gogo – Barcelona
• Year: 2005
• Client: ATLL Aigues Ter Llobregat
• PE100 PN10 Φ180 mm & Φ315 mm & Φ355 mm
• Total length: 835.9m, Drain #4: 325 m
• Filter length: 204 m
• Geology: fine sand
• Capacity 355mm: 90 L/s
• Specific capacity: 0.44 L/s/m
• Number of drains: 4
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Cala Gogo – Barcelona
• Temperature– Reduced range – typically lower than
seawater
• pH– Seawater/open intake 8 – 8.1
– Neodren filtrate 7.5 -7.7
Seawater (°C) 27 28 24 24 25 20 24 21NF (°C) 23.9 24.4 23.9 23.9 23.9 22.2 22.7 21.9
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Cala Gogo – Barcelona
• Turbidity– Turbidity consistently < 2
– During dredging, seawater turbidity of 31 NTU, Neodren Filtrate (NF) 4 NTU
Sea (NTU) 3.43 5.51 9.3 4.68 11.62 11.09 7.6 7.58 9.72
NF (NTU) 0.71 1.2 0.91 1.36 2.05 1.05 1.04 0.65 0.67
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Cala Gogo – BarcelonaSilt Density Index Sea (SDI5) 18.6 18.8 SDI1 to high 18.65 66.1 (SDI1)
Neodren (SDI15) 5.39 5.64 5.66 5.95 5.8
Turbidity (NTU) Sea 5.5 4.68 5.45 Neodren Filtrate 1.2 1.4 0.5
Source: Peters, T., Schuster, O., von Harten, B., Ulbricht, M. Schmidt, E. Pintó, D. and Pintó, E. (2008) Comparison of options for seawater pre-treatment for SWRO plants. 10th World Filtration Congress, proceedings volume II, Leipzig/Germany, April 14-18, 2008
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Source: Peters, T., Schuster, O., von Harten, B., Ulbricht, M. Schmidt, E. Pintó, D. and Pintó, E. (2008) Comparison of options for seawater pre-treatment for SWRO plants. 10th World Filtration Congress, proceedings volume II, Leipzig/Germany, April 14-18, 2008
Cala Gogo – Barcelona
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Cala Gogo – Barcelona
Date Seawater (TSS mg/L)
Neodren Filtrate (TSS mg/L)
02.08.2007 35 5
06.08.2007 33 6
09.08.2007 38 5
13.09.2007 86 6
26.09.2007 28 6
25.10.2007 27 3
Total Suspended Solids (measured gravimetrically)
Source: Peters (2009) personal communication (email), 17/1/2009
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Cala Gogo – Barcelona
• Chemical Analysis
Parameter Seawater Neodren Filtrate
Cl, Ca, Mg, Na, K, CO3, HCO3, NO3, SO4, F, Zn, B, TDS
no change
Al 28 – 420 μg/L < 20ug/LMn 70 - 98 μg/L to 170 – 215 μg/L Fe (total) < 80 – 323 μg/L < 80 μg/L Si < 0.2 – 0.5 mg/L 0.6 – 1.1 mg/LSiO2 < 0.4 – 1.1 mg/L 1.3 -1.4 mg/L
TSS 21 -38 mg/L 3 – 6 mg/LOil and Grease No change, < 1 mg/L
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Cala Gogo – Barcelona
• Total Organic Carbon
Seawater Neodren Filtrate0.1 0.2
<0.1 0.4
0.2 0.3
0.3 0.3
0.3 0.5
0.2 0.4
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Cala Gogo – Barcelona
• Micro-biological analysis
Parameter Seawater Neodren FiltrateColiform bacteria 4200 UFC/100mL 2 UFC/100mL
Clostridum perfringes 9 UFC/100mL 0 UFC/100mL
E. coli 0 UFC/100mL 0 UFC/100mL
Enterococcus 1000 UFC/100mL 0 UFC/100mL
Anaerobic bacteria (22°)
1100 UFC/mL 42 UFC/mL
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Cala Gogo – Barcelona
Date Parameter Seawater Neodren Filtrate12-05-2005 Turbidity (NFU) 5.3 0.29
TOC (mg/L) 1.91 1.318-05-2005 Turbidity (NFU) 19.6 0.7
TOC (mg/L) 1.79 1.22
Source: Peters, T.A., Pintó Bascompte, D. and Pintó Bascompte, E. (2009) Securing and improving seawater intake and pre-treatment with sub-seabed intake solutions. Power Point Presentation. IDA World Congress – Atlantis, The Palm – Dubai, UAE November 7-12, 2009
04/13/2023
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Investigation drainATLL Barcelona
Sampling Day 14.03. 29.03. 26.04. 03.05. 18.05.Seawater (mg/L) 3.42 2.05 1.67 1.68 1.75Neodren (mg/L) 1.36 1.52 1.6 1.35 1.59TOC reduction (%) 60.2 25.9 4.2 19.6 9.1
Total Organic Carbon (TOC)
Source: Peters, Thomas and Pintó, Domènec. 2006. Sub-seabed drains provide intake plus pretreatment.Desalination & Water Reuse, Volume 16. 2006. Reference in:Münk, F. (2008) Ecological and economic analysis of seawater desalination plants. Diploma Thesis, University of Karlsruhe, Institute for Hydromechanics, Karlsruhe
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La Tordera, Malgrat de Mar
• Year: 2007
• Client: Agencia Catala de l’Aigua (ACA)
• For information on desalination plant brochures: link
• PE100 PN10 φ450mm
• Length: 450m
• Filter length: 204m
• Geology: Medium grained sand
• Drain capacity: 80L/s
• Specific capacity: 0.36L/s/m
• SWRO pilot plant testing July 2007 – February 2008
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La Tordera, Malgrat de Mar, Spain
Open intake Sea
Pumping Station Malgrat de Mar
BoronColiformsTurbidity
Source: http://www.catalanadeperforacions.com/ftp/HistorialNeodren.pdf
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La Tordera, Malgrat de Mar, Spain
Source: http://www.catalanadeperforacions.com/ftp/HistorialNeodren.pdf
Open intakeNeodren
Neodren204m filter-10-11m seabed24m from the coast
Open intake107m from the coastDepth -5m
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La Tordera, Malgrat de Mar, Spain
Source: http://www.catalanadeperforacions.com/ftp/HistorialNeodren.pdf
SWRO Pilot Plant - Results of Chemical Analysis July 01- Feb 08
Pretreatment: Microfiltration Entry MF Output MF RO ProductNeodren
The average turbidity for Neodren was performed ‘in-situ’ rather than in the laboratory, since it has been observed that this varies as a function of time
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La Tordera, Malgrat de Mar, Spain
Source: http://www.catalanadeperforacions.com/ftp/HistorialNeodren.pdf
SWRO Pilot Plant - Results of Chemical Analysis July 01- Feb 08Pretreatment: Sand filter + cartridge filter
Entry sand filter Output CF RO ProductNeodren
The average turbidity for Neodren was performed ‘in-situ’ rather than in the laboratory, since it has been observed that this varies as a function of time
Entry CF
?
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La Tordera, Malgrat de Mar, Spain
Source: http://www.catalanadeperforacions.com/ftp/HistorialNeodren.pdf
SWRO Pilot Plant - Results of Chemical Analysis July 01- Feb 08
Pretreatment: Metex filterEntry Metex
Output Metex EfficiencyNeodren
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La Tordera, Malgrat de Mar
• SDISeawater – SDI5 17.95 17.89 17.29 17.3
Neodren – SDI15 5.54 5.77 5.86 5.8
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La Tordera, Malgrat de Mar
• Chemical Analysis
Parameter Notes
Cl, Ca, Mg, Na, K, CO3, HCO3, NO3, SO4, F, Zn, B, TDS
As expected, no change in values between SW and NF
Mn (mg/L) avg min max
SW nd nd 0.01NF 1.33 1.09 1.53
Fe (total) (mg/L) SW 0.05 0.01 0.1NF 2.53 2.01 2.99
TOC (mg/L) SW 2.2 < 2 3.2NF 2.37 <2 3.3
UV 254 SW 0.02 <0.01 0.02NF 0.03 <0.01 0.06
Oil and Grease < 1 both in SW and NF
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La Tordera, Malgrat de Mar
• Micro-biological analysisParameter Notes
Aerobic count 22° C (ufc/mL)
avg min maxSW 24 2 65NF 6 <2 37
Coliform Bacteria(ufc/100mL)
SW 21 2 80NF 0 0 1
E Coli(ufc/100mL)
SW 18 1 >50NF 0 0 0
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San Pedro del Pinatar - Murcia
• Year: 2003
• Client: PRIDESA - ABENGOA
• PE100 PN10 Ф355mm
• Total length: 9190.7m
• Filter length: 4545m
• Geology: permeable fractured rock material
• Total capacity: 2000 L/s
• Specific capacity: 0.44 L/s/m
• Number of drains: 20Source: http://www.catalanadeperforacions.com/ftp/HistorialNeodren.pdf
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San Pedro del Pinatar - Murcia
Source: Malfeito, J. & Jimenez, A. (2005) Horizontal Drains Intakes for Seawater Desalination – Experience of Cartagena, Acciona Agua
“The SDI before the sand filters is below 4...”
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San Pedro del Pinatar - Murcia
Source: Malfeito, J. & Jimenez, A. (2005) Horizontal Drains Intakes for Seawater Desalination – Experience of Cartagena, Acciona Agua
“…and the turbidity is below 1.5 NTU” (before sand filters)
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San Pedro del Pinatar - Murcia
“At the SWRO plant with Neodren has been installed one sand filter (sand), at the SWRO plant with the open intake have been installed two filter stages, both with multilayer (anthracite + sand). In both cases after these filters are installed 5 µm cartridge filter…”
“During our visit there we have been informed, that the SDI15 is usually about 3.1 to 3.2 after Neodren, about 0.9 after the sand filter and 0.8 after the 5 µm cartridge filter. The seawater has been reported to have had an SDI5 of 14.5 at that day.”
Source: Peters (2009) personal communication (email), 17 Jan. 2009
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