© s::can Messtechnik GmbH (2015)

Optimizing the performance of drinking water fi ltration with the i::scanDrinking water treatment monitoring

Background Green Innovation Technologies Inc. (GIT) is in-stalling and operating surface water fi ltration units for the drinking water supply in Puerto Rico. The replacement of old systems with new, mod-ern water fi ltration plants ensures that the people served by these plants will enjoy safe and clean drinking water for years to come.

GIT is using silicon carbide ceramic membranes for the fi ltration units. Silicon carbide ceramic membranes offer a longer life cycle and are more resistant to in deep cleaning methods as their polymeric membranes coun-terparts. However, since this is a new technology, it is important to deter-mine the optimal operating conditions in terms of coagulant dose and clean-ing cycles.

s::can’s solutionAn i::scan is installed together with a con::lyte terminal to monitor the fi l-tered drinking water. s::can’s i::scan is a powerful tool for monitoring water quality, providing cost-effective moni-toring with very low maintenance and operation costs.

TOC, UV254 and NTU of the raw and fi ltered water are measured in real time by a single i::scan. The mea-surement data is used to calculate how much of the TOC is removed by the fi ltration.The raw water at the intake has only little turbidity and a low level of solids (left cup in the image above). With the fi ltration unit it is possible to con-

centrate the organic matter (middle cup) and re-duce the TOC content of the water.

TOC removal is important because lower TOC means lower formation of disinfection byprod-ucts and other undesirable substances such as

trihalomethanes. But excess coagulant dos-age will only increase cost without a signifi -cant increase in TOC removal.

The i::scan enables quick evaluation of the effi ciency of different coagulants and aids in fi nding the optimal co-agulant dosage. This greatly reduces the time and effort needed for the start-up and operation of new fi ltra-tion plants.

In Puerto Rico the i::scan is used to asses the effi ciency of different coagulants and to optimize cleaning protocols of drinking water fi ltration units.

Parametersmonitored:

• NTU• TOC• UV254

Facts & Figures

Company:Green InnovationTechnologies Inc.

Location:Puerto Rico

Application:Drinking Water

Key Products installed:i::scan, con::lyte

Green InnovationTechnologies Inc.

“The beauty of the data produced by the i::scan is, that it is in real time, so the optimization of cleaning protocols and coagulant dose can be performed very quickly”Carlos Gonzalez, GIT

GIT

s::can Messtechnik GmbHBrigittagasse 22-24 1200 Vienna, Austria

Phone: +43 / 1 / 219 73 93Fax: +43 / 1 / 219 73 93-12

E-Mail: sales@s-can.atWeb: www.s-can.at

Process Schematic

The i::scan is an optical online probe that uses a new LED light source and can mea-sure up to four parameters simultaneously.

Parameters that can be measured accu-rately include Turbidity, TSS, COD, TOC, DOC, Color and UV254.Due to the use of multiple wavelengths, cross-sensitivities can be automatically compensated.

The fl ow cell for the i::scan can be equipped with a rotating brush to automate the clean-ing of the optical windows.Cleaning intervals and the duration of cleaning can be freely confi gured to guar-antee optimal cleaning performance de-pending on the specifi c application.

By monitoring the treatment of raw water sources s::can helps to protect the health and safety of the population.s::can is the world technology leader for submersible online spectrometer probes, water protection systems and event detec-tion software.More than 6000 s::can monitoring systems are in use worldwide for drinking, environ-mental, waste, and industrial water appli-cations.

The graphs below show the effi ciency of TOC removal for two different coagulants. This data can be used to optimize the drinking water fi ltration process

Water Treatment Plant

Optimization of Complete Ultra Filtration with Purifi cs Silicon Carbide Ceramic Membranes (0.1 microns)

Coagulant 1 [ ppm ]

Rem

oval

of T

OC

[ %

]

Coagulant 2 [ ppm ]

Rem

oval

of T

OC

[ %

]

Target Removal of TOC [ % ] Target Removal of TOC [ % ]Removal by Complete Ultra FiltrationRemoval by Complete Ultra Filtration

User | Raw Water Intake 31-JAN | 12:00:06

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Time Series

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Values

condu::lyser

Conductivity

853µS/cm

19-10-2011 12:00

C

pH::lyser

7.82pH

19-10-2011 12:00

C

chlori::lyser

1.83mg/l

19-10-2011 12:00

C

spectro::lyser

58NTU

19-10-2011 12:00

C

TurbidityFree ChlorinepH

spectro::lyser

COD

108.3mg/l

19-10-2011 12:00

CC

carbo::lyser

37.51mg/l

19-10-2011 12:00

C

nitro::lyser

4.52mg/l

19-10-2011 12:00

C

ammo::lyser

1.24mg/l

19-10-2011 12:00

C

NH4-NNO3-NTOC

R: 101,9 mg/l