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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• 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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• 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


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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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• 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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• 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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• 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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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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• 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

http://www.catalanadeperforacions.com/ftp/HistorialNeodren.pdf

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Open intakeNeodren

Neodren204m filter-10-11m seabed24m from the coast

Open intake107m from the coastDepth -5m


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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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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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SWRO Pilot Plant - Results of Chemical Analysis July 01- Feb 08

Pretreatment: Metex filterEntry Metex

Output Metex EfficiencyNeodren


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• SDISeawater – SDI5 17.95 17.89 17.29 17.3

Neodren – SDI15 5.54 5.77 5.86 5.8

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• 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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• 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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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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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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“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

Neodren Filtrate Water Quality 2014 04 22

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