Potabilization process

A process and water purification technology, applied in water/sewage treatment, chemical instruments and methods, waste water treatment in processing, etc., can solve problems such as high viscosity and achieve the effect of reducing turbidity

Inactive Publication Date: 2015-07-15
ROQUETTE FRERES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now, the disadvantage of the process which is the subject of patent application PCT / FR 2012 / 051714 is that the starch compositions useful in the present invention have a relatively high viscosity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0138] This example presents a different process including a coagulation-flocculation step not according to the invention. These examples make it possible to show the problems solved by the invention.

[0139] products used

[0140] "A": Comparative cationic starch solution according to test A with a Brookfield viscosity of 17 500 mPa.s. This solution, "A", was obtained from a cationic starch (non-waxy potato base) with a DS of 0.16. This starch is soluble in water at 20°C.

[0141] "B": comparative cationic starch solution according to test A, whose Brookfield viscosity is 53 000 mPa.s. This solution, "B", was obtained from a cationic starch (waxy corn matrix) with a DS of 0.05. At 20°C, this starch is insoluble, and therefore the solution was prepared by cooking the solution at 95°C for 15 minutes.

[0142] These first two liquid starch compositions A and B had high viscosity. They cannot be in the form of compositions with high solids content that can be easily pumpe...

example 2

[0153] This example illustrates the use of the invention in combination with a starch solution, iron salt as metal salt.

[0154] "A": The same solution as in Example 1.

[0155] "D": Comparative cationic starch solution according to test A, whose Brookfield viscosity is 350 mPa.s. This solution "D" was obtained from a non-waxy cationic starch (potato base) having a DS of 0.16 which had been subjected to enzymatic hydrolysis. This starch is soluble in water at 20°C.

[0156] "E": cationic starch solution according to the invention, according to test A, whose Brookfield viscosity is 210 mPa.s. This solution "E" was obtained from a cationic starch (waxy maize substrate) which had been subjected to an enzymatic hydrolytic treatment with a DS of 0.05. This starch is soluble in water at 20°C.

[0157] "F": cationic starch solution according to the invention according to test A, the Brookfield viscosity of which is 810 mPa.s. This solution, "F", was obtained from a cationic sta...

example 3

[0167] This example illustrates the invention by using an aluminum salt as a metal salt with a starch solution.

[0168] PAC: poly aluminum chloride

[0169] "G": 70 / 30 mixture of PAC and A by mass

[0170] "H": 70 / 30 mixture of PAC and E by mass

[0171] Mixtures "G" and "H" were evaluated by beaker testing for the purpose of potability of river water taken from the River Leith (initial turbidity 6 NTU). Fill the water with shoreline sludge to achieve a turbidity of 50 NTU. The scheme is the same as in the previous example. The results obtained are collected in Table 4.

[0172] Table 4

[0173] test mixture

Turbidity of supernatant (NTU)

Turbidity reduction %

G

0.4

99.1％

H

0.5

99.0％

[0174] Mixture H was as effective as Mixture G.

[0175] After 2 months of storage, Mixture H had a stable viscosity and was just as effective in the process. It should be noted that, as in the case of the starch solution useful for ...

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Abstract

The subject matter of the invention is a process for potabilization of an aqueous solution containing solids in suspension, comprising a coagulation-flocculation step, characterized in that said step comprises: a) a step of adding coagulants to the aqueous solution to be treated; b) a step of stirring the aqueous solution to which coagulants were thus added; c) a step of separating the coagulated solids by settling out or flotation; d) a step of recovering purified water; and in which the coagulants added in step a) comprise metal salts chosen from ferric salts and aluminium salts, and also a liquid starchy composition comprising a cationic waxy starch, said cationic starch having, when it is placed in the form of an aqueous composition, a viscosity, measured according to a test A, greater than 100 mPa.s and less than 1000 mPa.s, this test A consisting in adjusting the dry weight of cationic waxy starch of the aqueous composition to 10% and then measuring the Brookfield viscosity at 25°C of the resulting composition.

Description

technical field [0001] The present invention relates to a process for making water potable, in particular a process comprising a coagulation-flocculation step in which a liquid composition of a metal salt, a specially dissolved cationic starch is used in combination. technical background [0002] In the water sector, the treatment processes are very diverse: for example, wastewater or municipal sewage or water from industrial processes is treated differently before it is discharged into the environment. [0003] For example, with regard to drinking water, after this process, high purity water must be obtained. Since its distribution is a major concern of the crowd, heavy regulation has been imposed for many years. The high purity of this water is achieved by using very specific processes quite different from other water treatment processes where the purity of the water obtained may be inferior. [0004] In order to obtain drinking water, it is possible to pump an aqueous s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
CPCC02F1/5245C02F1/5272C02F1/54C02F2103/28
Inventor L·克劳泰尔-阿尔温A-C·埃朗C·鲍狄埃R·乌泽
Owner ROQUETTE FRERES SA
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