Voltea CapDI Horticulture Case Study

ABOUT VOLTEA

Voltea’s award-winning tunable desalination technology, CapDI © (Membrane Capacitive Deionization), desalinates brackish water at a lower economic and environmental cost than any other available technology. CapDI is a simple and innovative way to remove dissolved salts from water. Voltea’s CapDI technology is scalable and helps consumers and industry reduce water usage and save money.

CAPDI © PERFORMANCE RESULTS

Operational Data:

Voltea’s IS-12 CapDI System consistently produced the quality and quantity of water required to meet our customer’s demands. 85% water recovery was maintained by Voltea’s fully automated Cleaning-In-Place (CIP) features that automatically clean if the CapDI System measures a rise in differential pressure. This water was treated to a suitable reuse quality, therefore reducing the overall amount of fresh deep well water consumed. The high water recovery also allows a smaller volume of waste that would require treatment before discharge, resulting in a reduced impact to the aquifer. Voltea’s CapDI System is continuing to help this facility with the production of crops at a reduced environmental impact, which in the long term will assist in greater productivity and reduced operating expense.

Table 1

Constituents

Feed Water

Sample 1

Sample 2

Sample 3

Unit µS/cm ppm

Target Conductivity pH Chloride (Cl - ) Sulfates (SO 4 2- ) Bicarbonate (HCO 3 - ) Potassium (K + ) Sodium (Na + ) Calcium (Ca 2+ ) Magnesium (Mg 2+ )

1,300

300

400 85 38 32 6.3

800 77 78 6.6 51 12 146

353 211 104 7.2

6

10 18

ppm ppm ppm ppm ppm ppm ppm

< 8 61

89 37

32 8 72 10 24

21 5 16 72

72 190 124

72 22 64

Silica (SiO 2 )

From the short term testing performance in Table 1, the customer was able to select a long term operational setting with which to operate the CapDI System based on the crop to be irrigated and its sodium requirements.

Table 2

Summary Period Period 1

Period 2

Period 3

Period 4

Target Conductivity (µS/cm) Average Output Conductivity (µS/cm) Average Feed Conductivity (µS/cm) Volume Produced (m 3 )

500 489 1,324 1,173

300 302 1,433

700 670 1,433

700 679 1,380

448

984

864

Table 2 shows actual CapDI System data over a five month period at the customer’s site. The tunability benefit can be observed while the targeted water quality was met as changes in irrigation water use demanded different sodium levels corresponding to the overall water conductivity. The removal of only the excess sodium allows the crops to benefit from the nutrients and salts remaining in the water.

Unlocking the world's water potential

Voltea B.V. European H.Q.

Voltea INC. U.S. Office

Voltea B.V reserves the right to modify the design and specification contained herein without prior notice. Please contact your local Voltea sales representative for the most current information, or visit us at www.voltea.com or info@voltea.com.

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