Method and system for optimization of coagulation and/or flocculation in a water treatment process

Patent metadata

Field	Value
Publication number	US-10988392-B2
Application number	US-201716088749-A
Country	US
Kind code	B2
Filing date	Mar 31, 2017
Priority date	Apr 1, 2016
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

Methods and systems are disclosed for optimization of coagulation and/or flocculation in a water treatment process. According to exemplary embodiments, samples are taken from an aqueous liquid and the samples are monitored with an imaging device to capture visual data of particles dispersed or suspended in the liquid. The particles are classified into particle types based on the visual data and a particle size distribution indication is computed for each classified particle type. The particle size distribution indication is then compared to a predetermined particle size distribution value, and in response to a difference detected, dosage of at least one coagulation and/or flocculation agent in the water treatment process can be adjusted.

First claim

The invention claimed is:

1. A computerized method for monitoring and/or optimization of coagulation and/or flocculation in a water treatment process, the method comprising:
taking samples from an aqueous liquid;
monitoring the samples with an imaging device to capture visual data of particles dispersed or suspended in said liquid;
classifying particle types based on said visual data;
computing a particle size distribution indication for at least one classified particle type; and
comparing said particle size distribution indication to a predetermined particle size distribution value;
wherein the method comprises at least one of:
a) computing a particle size distribution indication for flocs, and comparing the particle size distribution indication for flocs to a predetermined particle size distribution value;
b) computing a particle count for microparticles, and comparing said particle count for microparticles to a predetermined particle count value; or
c) monitoring the samples with the imaging device to capture visual data of compounds dissolved in the liquid, computing water color of the samples based on the visual data, and comparing the computed water color to a predetermined water color value;

wherein the method further comprises:
adjusting, at least partially in response to a difference detected in any one or combination of the comparing steps, a dosage of at least one coagulation and/or flocculation agent in the water treatment process to optimize the coagulation and/or flocculation of the particles dispersed or suspended in the liquid.

2. The method according to claim 1 , wherein the computing of the particle count for the microparticles comprises:
computing the particle count for particles having a particle size of 0.1 to 500 μm.

3. The method according to claim 1 , wherein the method comprises:
computing a particle size distribution indication for at least one of fiber, fluff, micro-particle, or microplastics; and
comparing said particle size distribution indication to a predetermined particle size distribution value.

4. The method according to claim 1 , wherein classifying of the particles is done based on shape factors and/or the size of said particles.

5. The method according to claim 1 , wherein classifying of the particles is done based on color factors of said particles.

6. The method according to claim 1 , wherein said particle types comprise one or more of the following:
a floc, fiber, fluff, micro-particle, or microplastics.

7. The method according to claim 1 , wherein adjusting of the dosage of at least one chemical to the water treatment process is additionally done based on a measurement from captured visual data, the measurement comprising one or more of the following:
water color, particle color, turbidity, particle concentration, micro-particle size and concentration, floc growth rate during flocculation, or floc settling of a liquid flow.

8. The method according to claim 1 , wherein a flow of an aqueous liquid to be monitored is surface water, ground water, salt water, raw water, wastewater, or industrial process water.

9. The method according to claim 1 , wherein a chemically treated aqueous flow of the aqueous liquid is directed to a separation unit, for a flotation, sedimentation, reverse osmosis, nanofiltration, ultrafiltration, or microfiltration process.

10. The method according to claim 7 , wherein the at least one chemical is selected from:
coagulants and flocculants, water-soluble salts or anionic, nonionic and cationic polyelectrolytes of univalent or multivalent cations, sodium, calcium, magnesium, iron, aluminum, natural products, starch, semi-synthetic polymers, cationic starch and synthetic polymers, acrylic polymers, polyamines, polyethylene oxides and allylic polymers, or a mixture thereof.

11. A system for monitoring and/or optimization of coagulation and/or flocculation in a water treatment process, the system comprising:
a data processing unit and, functionally connected to said data processing unit:
means for taking samples from an aqueous liquid;
an imaging device configured to capture visual data of particles dispersed or suspended in said liquid; and
means for controlling a dosage of at least one coagulation and/or flocculation agent to the water treatment process, wherein said data processing unit including a non-transitory computer readable medium having stored thereon a set of computer executable instructions for causing the data processing unit to perform steps of:
classifying particle types based on said visual data;
computing a particle size distribution indication for at least one classified particle type; and
comparing said particle size distribution indication to a predetermined particle size distribution value;
wherein said data processing unit is configured to carry out at least one of:
a) compute a particle size distribution indication for flocs, and compare the particle size distribution indication for flocs to a predetermined particle size distribution value;
b) compute a particle count for microparticles, and compare said particle count for microparticles to a predetermined particle count value; or
c) monitor the samples with the imaging device to capture visual data of compounds dissolved in the liquid, compute water color of the samples based on the visual data, and compare the computed water color to a predetermined water color value;

wherein said data processing unit is further configured to:
in response to a difference detected in any one or combination of the comparing steps, adjusting the dosage of at least one flocculation and/or coagulation agent for said particles to an aqueous liquid flow of the aqueous liquid to optimize the coagulation and/or flocculation of the particles dispersed or suspended in the liquid.

12. The system according to claim 11 , wherein said data processing unit is configured to:
compute the particle count for particles having a particle size of 0.1 to 500 μm.

13. The system according to claim 11 , wherein said data processing unit is configured to:
compute a particle size distribution indication for at least one of fiber, fluff, micro-particle, or microplastics; and
compare said particle size distribution indication to a predetermined particle size distribution value.

14. The system according to claim 11 , wherein said data processing unit is configured to:
compare the obtained visual data to stored reference data of shape factors and/or size of particles, in order to classify said particle types.

15. The system according to claim 14 , wherein said data processing unit is configured to:
additionally compare the obtained visual data to stored reference data of color factors of particles, in order to classify said particle types.

16. The system according to claim 11 , wherein said particle types comprise one or more of the following:
a floc, fiber, fluff, micro-particle, or microplastics.

17. The system according to claim 11 , wherein said data processing unit is configured to:
adjust dosage of at least one chemical to the water treatment process based on a measurement from the captured visual data, the measurement comprising one or more of the following:
water color, particle color, turbidity, particle concentration, micro-particle size and concentration, floc growth rate during flocculation, or floc settling of said aqueous liquid flow.

18. The system according to claim 17 configured for a water treatment process to optimize coagulation and/or flocculation, wherein the at least one chemical is se

Assignees

• Kemira Oyj

Inventors

• Piironen Marjatta
• Joensuu Iiris
• Hesampour Mehrdad

Classifications

• G01N33/1893

  using flow cells · CPC title

• C02F1/5272

  using specific organic precipitants · CPC title

• C02F1/24

  by flotation (C02F1/465 takes precedence) · CPC title

• G01N15/06

  Investigating concentration of particle suspensions (by weighing G01N5/00; investigating sedimentation of particle suspensions G01N15/04; investigating individual particles G01N15/10) · CPC title

• C02F1/5263

  using natural chemical compounds · CPC title