WO2018189015A1 - Water purification composition comprising inert particulate and purification mixture - Google Patents

Water purification composition comprising inert particulate and purification mixture Download PDF

Info

Publication number
WO2018189015A1
WO2018189015A1 PCT/EP2018/058681 EP2018058681W WO2018189015A1 WO 2018189015 A1 WO2018189015 A1 WO 2018189015A1 EP 2018058681 W EP2018058681 W EP 2018058681W WO 2018189015 A1 WO2018189015 A1 WO 2018189015A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
anionic
purification
purification composition
compound
Prior art date
Application number
PCT/EP2018/058681
Other languages
French (fr)
Inventor
Debosree CHATTERJEE
Ganesan RAJENDIRAN
Dhanalakshmi THIRUMENI
Original Assignee
Unilever N.V.
Unilever Plc
Conopco, Inc., D/B/A Unilever
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unilever N.V., Unilever Plc, Conopco, Inc., D/B/A Unilever filed Critical Unilever N.V.
Priority to BR112019021160-8A priority Critical patent/BR112019021160B1/en
Publication of WO2018189015A1 publication Critical patent/WO2018189015A1/en
Priority to PH12019502207A priority patent/PH12019502207A1/en
Priority to ZA2019/06407A priority patent/ZA201906407B/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5272—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using specific organic precipitants
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/04—Surfactants, used as part of a formulation or alone

Definitions

  • the present invention relates to a water purification composition.
  • the present invention in particular relates to a water purification composition for clarifying source water which otherwise hampers cleaning performance of detergents.
  • the water purification composition of the present invention comprises an aluminium chlorohydrate compound, a salt of an organic anionic compound having a molecular weight of not more than 1 ,000 kDa, a non-ionic and/or anionic polymeric flocculant having a molecular weight of more than 1 ,000 kDa and an inert particulate filler.
  • the present invention further relates to a method for clarifying water and to a water clarification kit.
  • Water is one of the necessities of human life. Water is important for drinking, cooking food and for preparing beverages. Water is also very important for cleaning items used in the household like clothes, utensils, and other surfaces in the homes e.g the floors and table tops. Further, a large amount of water is used for personal cleaning in the bathrooms and toilets. The quality of water required for each of the above is different.
  • Flocculation typically applies the use of sweep flocculation followed by bridging flocculation.
  • Sweep flocculation encompasses the following: electrolyte flocculants, such as Al-based or Fe-based salts, are added in a sufficient amount so that they form amorphous particles, e.g. amorphous AI(OH)3 particles. These amorphous particles entrap suspended solids leading to clarification of water. Such particles with entrapped suspended solids are called sweep floes and have a size in the range of 100 ⁇ or below. At this size the sweep floes are still difficult to separate from the water by, e.g. filtration or decantation. Moreover the kinetics of settling down of the sweep floes is very slow.
  • electrolyte flocculants such as Al-based or Fe-based salts
  • the next step is bridging flocculation which encompasses the addition of a polymeric flocculant with a molecular weight of at least 1 ,000 kDa. These polymers are thought to adsorb on the sweep floes and thereby bringing the sweep floes together to form bigger and stronger floes. This phenomenon is known as bridging flocculation. This bridging mechanism helps in increasing the settling velocity of the floes and contributes therefore to faster clarification of water.
  • Such water purification processes which apply sweep flocculation, are typically found in the area of industrial waste water purification.
  • Various industries produce waste water, such as chemical manufacturing plants, dairies, canneries, distilleries, paper manufacturing plants, dyeing plants, sewage plants and others.
  • These water purification processes for industrial waste water typically require large water treatment plants and are time-consuming processes.
  • said anionic surfactant is sodium lauryl ether sulfate
  • the cationic coagulant is selected from the group consisting of diallyl dimethylammonium chloride polymer, epichlorohydrin dimethylamine polymer, ethylene amine polymer, polyaluminum chloride, and alum
  • the flocculant is an acrylamide/sodium acrylate copolymer having an RSV greater than 23.
  • CN104445548 (ANHUI TIANRUN CHEMICALS, 2015) describes a composition comprising polyacrylamide for the treatment of sewage and sludge.
  • the composition comprises polyacrylamide with a molecular weight between 1 ,000-15,000 kDa, and further comprises water-soluble surfactant, inorganic coagulant and water soluble inorganic salts.
  • the water-soluble surfactant accounts for 1 to 10% by mass of the polyacrylamide.
  • a water purification composition that utilizes flocculation to purify water for household purposes should meet a number of requirements.
  • the turbidity should be reduced to an acceptable level in a reasonable amount of time, e.g. in a few minutes. For cleaning purposes a turbidity of 15 NTU or less is considered to be acceptable.
  • consumers have a preference for easy dosing systems, i.e. for an integral purification composition that only needs to be dosed once.
  • the purification composition should be suitable for each type of natural source water, independent of the characteristics of the water.
  • the characteristics of natural source water varies across different geographies, and may have varying levels of turbidity, water hardness, total dissolved solids (TDS), alkalinity and so on.
  • Aluminium chlorohydrate i.e. polyaluminium chloride with high basicity
  • Aluminium chlorohydrate is typically applied in sweep flocculation when clarification of water is desired without alteration of the pH of the clarified water.
  • One of the drawbacks of the application of aluminium chlorohydrate in sweep flocculation is that it only works if the natural source water, that needs to be clarified, has sufficient alkalinity.
  • a known solution to this problem is to add a source of alkalinity to purification compositions that comprises aluminium chlorohydrate and bridging flocculant.
  • US 6,136,219 A (DECKER STEPHEN, 2014) describes a composition for use in clarifying a body of water where pH balancing is required consisting essentially of, by weight, 46% of an anionic high molecular weight polyacrylamide having more than 100,000 monomer units per molecule, 46% of at least one compound selected from the group of aluminium chloral hydrate and aluminium oxide, 6% of at least one compound selected from the group of calcium carbonate and calcium sulfate; and approximately 2% citric acid.
  • the present invention provides a water purification composition comprising:
  • a non-ionic and/or anionic polymeric flocculant having a molecular weight of more than 1 ,000 kDa;
  • the molar ratio of the organic anionic compound to the aluminium is at least 0.19, and wherein the basicity is defined by the equation: 100% * [OH] / (3 * [Al]).
  • the anionic compound in the present composition aids sweep flocculation with aluminium chlorohydrate by reducing the positive surface charge of the aluminium hydroxide particles. This provides an alternative to the presence of sufficient alkalinity that is normally required for sweep flocculation with aluminium chlorohydrate.
  • the present purification composition is therefore suitable, without requiring a source of alkalinity, for purifying a wide range of source water, irrespective of the alkalinity present in the source water.
  • the anionic compound of the present invention can be suitably be packaged together with the aluminium chlorohydrate and is therefore suitable for dosaging as a single component.
  • the invention also provides a method for clarifying water comprising suspended solids, said method comprising the steps of:
  • the purification composition is a purification composition according to the present invention.
  • a first aspect of the invention relates to a water purification composition
  • a water purification composition comprising:
  • a non-ionic and/or anionic polymeric flocculant having a molecular weight of more than 1 ,000 kDa;
  • the anionic compound provides at least 0.19 of the one or more anionic groups per aluminium atom present in the aluminium chlorohydrate compound.
  • locculation' refers to a process of contact and adhesion whereby the particles of a dispersion form larger-size clusters.
  • polymeric flocculant refers a polymer that is capable of promoting flocculation.
  • aluminium chlorohydrate refers to compounds having the general formula (Al n CI(3n-m)(OH) m ), wherein the basicity of said compounds is in the range of 70% to 95%.
  • turbidity refers to the cloudiness or haziness of a fluid caused by a large number of individual particles.
  • NTU Nephelometric Turbidity Units
  • the nephelometer preferably is calibrated using the standard formazin solutions as recommended by the instrument manufacturer. The nephelometer measures the propensity of particles to scatter a light beam focused on them.
  • the unit Da Da (Dalton) as used herein refers to atomic mass unit (amu, the less commonly used SI unit).
  • the purification composition of the present invention preferably has a low alkalinity, notably an alkalinity of less than 8 ppm as CaCC , when 0.5 gram of the composition is dispersed in 1 litre of deionized water having a temperature of 25°C. More preferably, the purification composition has an alkalinity of less than 7 ppm as CaCC , most preferably of less than 6 ppm as CaCC , when 0.5 gram of the composition is dispersed in 1 litre of deionized water having a temperature of 25°C. Alkalinity measured as CaCC can be determined by means of titration as described in ASTM D 1067-06.
  • the purification composition of the present invention is preferably a solid, more preferably a powder or a granulate.
  • the combination of the inert particulate filler and the purification mixture preferably represents at least 80 wt.%, more preferably at least 85 wt.% and most preferably at least 90 wt.% of the purification composition.
  • the amount of inert particulate filler employed in the purification composition preferably is in the range of 20-90 wt.%, more preferably in the range of 30-80 wt.%, most preferably in the range of 40-75 wt.%.
  • the purification mixture containing the aluminium chlorohydrate compound, the salt of an anionic compound having a molecular weight of not more than 1 ,000 kDa and the non-ionic and/or anionic polymeric flocculant preferably constitutes 5-70 wt.%, more preferably in the range of 15-65 wt.%, most preferably in the range of 25-60 wt.% of the purification composition.
  • the aluminium chlorohydrate compound having a basicity in the range of 70%-95% is preferably present in a concentration, calculated by weight of the purification mixture, of 20-70 wt.%, more preferably of 25-60 wt.%, most preferably of 30-55 wt.%.
  • the composition preferably contains 20-70 wt. %, more preferably 25-60 wt.% and most preferably 30-55 wt.% of the salt of an anionic compound having a molecular weight of not more than 1 ,000 kDa.
  • the non-ionic and/or anionic polymeric flocculant having a molecular weight of more than 1 ,000 kDa is preferably present in a concentration, calculated by weight of the purification mixture, of 5-18 wt.%, more preferably of 6-15 wt.% and most preferably of 10-12 wt.%.
  • the combination of aluminium chlorohydrate compound, anionic compound, polymeric flocculant and inert particulate filler typically constitutes at least 80 wt.%, more preferably at least 85 wt.% and most preferably at least 90 wt.% of the purification composition.
  • the water content of the purification composition preferably does not exceed 10 wt.%, more preferably the water content does not exceed 8 wt.%.
  • the aluminium chlorohydrate compound in the purification composition is preferably selected from aluminium chlorohydrate, aluminium chlorohydrate sulfate and combinations thereof. Most preferably, the aluminium chlorohydrate compound is aluminium chlorohydrate.
  • the cation of the salt of the anionic compound preferably is a monovalent or divalent cation, more preferably it is a cation selected from K + , Na + , Mg 2+ and combinations thereof.
  • the organic anionic compound in the purification composition preferably is selected from:
  • an anionic compound comprising one or more anionic groups selected from sulfonate and sulfate;
  • the anionic compound is an organic anionic compound comprising one or more carboxylate groups.
  • the anionic compound is an organic anionic compound comprising one or more carboxylate groups selected from:
  • anionic polysaccharide with a molecular weight ranging from 1-1 ,000 kDa;
  • the acrylate polymer is preferably selected from polyacrylate, poly(methyl methacrylate), copolymers and combinations thereof. Most preferably, the acrylate polymer is polyacrylate.
  • the acrylate polymer is preferably employed in the purification composition of the present invention to provide 0.2 to 1 , more preferably 0.3 to 0.8, most preferably 0.38 to 0.60 carboxylate groups per aluminium atom present in the aluminium chlorohydrate compound.
  • the anionic polysaccharide that can be applied as anionic compound in the purification composition is preferably selected from carboxymethyl cellulose, hydroxymethyl cellulose, hydroxylethyl methylcellulose, hydroxy I propyl methylcellulose, xanthan gum, alginate, pectin and combinations thereof. More preferably, the anionic polysaccharide is carboxymethyl cellulose, most preferably the anionic polysaccharide is the sodium salt of carboxymethyl cellulose with a degree of substitution ranging from 0.5 to 2.
  • the anionic polysaccharide preferably has a molecular weight ranging from 80-800 kDa.
  • the anionic polysaccharide is preferably applied in the present purification composition to provide 0.2 to 0.75, more preferably 0.3 to 0.67, most preferably 0.4 to 0.59 carboxylate groups per aluminium atom present in the aluminium chlorohydrate compound.
  • the conjugate base that can be applied as anionic compound in the purification composition preferably is the conjugate base of an organic carboxylic acid selected from lactate, citrate, tartrate, propionate and combinations thereof. More preferably, the anionic compound is the conjugate base of an organic carboxylic acid selected from citrate, tartrate and combinations thereof. Most preferably, the conjugate base of an organic carboxylic acid is citrate.
  • the conjugate base of an organic carboxylic acid is preferably applied in the purification composition to provide at least 0.19, more preferably 0.38 to 10, most preferably 0.57 to 5 carboxylate groups per aluminium atom present in the aluminium chlorohydrate compound.
  • the anionic compound in the purification composition is an organic anionic compound comprising one or more anionic groups selected from sulfonate and sulfate.
  • the organic anionic compound comprising one or more anionic groups selected from sulfonate and sulfate is an anionic surfactant comprising one or more anionic groups selected from sulfonate and sulfate.
  • anionic surfactants include alkyl benzene sulfonate, alpha olefin sulfonate alkyl sulfate, alkenyl sulfate, alkyl ether sulfate, alkyl ethoxy sulfate and combinations thereof. More preferably, the anionic compound is an anionic surfactant selected from sodium dodecyl benzene sulfonate (Na-LAS), sodium dodecyl sulfate (SDS), sodium lauryl ether sulfate (SLES), methyl ester sulfate (MES), primary alcohol sulfate (PAS), alpha olefin sulfonate and combinations thereof. Most preferably, the anionic compound is an anionic surfactant selected from sodium dodecyl benzene sulfonate, sodium lauryl ether sulfate and combinations thereof.
  • the anionic surfactant is preferably applied in the purification composition to provide 0.29 to 0.86, more preferably 0.34 to 0.73, most preferably 0.4 to 0.6 of the one or more anionic groups, selected from sulfonate and sulfate, per aluminium atom present in the aluminium chlorohydrate compound
  • anionic surfactant is particularly effective if the surfactant is coated onto the inert particulate filler or if the surfactant is present in the form of relatively large particles.
  • the purification composition contains inert particulate filler that is coated with the anionic surfactant.
  • the anionic surfactant is present in the purification composition in particulate form and has a mass weighed diameter in the range of 75-1 ,000 ⁇ , more preferably in the range of 100-800 ⁇ , most preferably in the range of 125-600 m.
  • the inert particulate filler in the purification composition preferably has a density of at least 1.5 kg/dm 3 , more preferably a density of 1.75-2.7 kg/dm 3 , most preferably a density of 2- 2.5 kg/dm 3 .
  • the inert particulate filler is preferably selected from feldspar, silica, bentonite, calcite, diatomaceous earth and combinations thereof. Most preferably, the inert particulate filler is feldspar.
  • the polymeric flocculant in the purification composition preferably is an anionic polymeric flocculant.
  • the anionic polymeric flocculant is preferably selected from soluble alkali metal salts of poly (acrylic acid), polyacrylamide, and copolymers thereof.
  • Another aspect of the invention relates to the use of the purification composition as described herein for the clarification of water, preferably for the clarification of water with a turbidity of at least 50 NTU.
  • a further aspect of the invention relates to a method for clarifying water comprising suspended solids, said method comprising the steps of:
  • the purification composition is a purification composition as described herein.
  • the present method is particularly effective for clarifying water having a turbidity of at least 50 NTU.
  • the purification composition is dosed at 0.2-1 .5 grams of dry matter per liter of water.
  • Yet another aspect of the invention relates to a water clarification kit comprising a container comprising a purification composition as described herein; and instructions for use instructing users to dose the purification composition to water to obtain water suitable for the preparation of an aqueous cleaning composition.
  • the kit does not comprise a separately packaged second composition having an alkalinity of at least 8 ppm as CaCC , when 0.5 gram of the second composition is dispersed in 1 litre of deionized water having a temperature of 25°C.
  • the water purification compositions shown in Table 1 were added to the aforementioned turbid water in an amount of 0.5 gram per litre while continuously stirring, for 30 seconds at 100 rpm. After these 30 seconds of stirring the mixture was allowed to standstill for 1.5 minutes to allow the floes to separate from the clarified water.
  • the turbidity of the samples was measured using a Turbiquant® 2100 T manufactured by Merck.
  • the calibration of the machine was done using standard protocol as per manual of the instrument.
  • a purification compositions containing sodium polyacrylate (Molecular weight: 350 kDa) was prepared on the basis of the recipes shown in Table 5.
  • the aluminium chlorohydrate used had a basicity of 85%.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The present invention relates to a water purification composition comprising: 18-98 wt.% by dry weight of the composition of inert particulate filler; and 2-82 wt.% by dry weight of the composition of a purification mixture comprising by weight of this mixture: a. 15 to 80 wt. % of an aluminium chlorohydrate compound of the general formula (AlnCl(3n-m)(OH)m), having a basicity in the range of 70%-95%; b. 15 to 80 wt. % of a salt of an organic anionic compound having a molecular weight of not more than 1,000 kDa and wherein said organic anionic compound comprises one or more anionic groups selected from carboxylate, sulfonate and sulfate; and c. 5 to 20 wt. % of a non-ionic and/or anionic polymeric flocculant, having a molecular weight of more than 1,000 kDa; wherein the molar ratio of the organic anionic compound to the aluminium is at least 0.19, and wherein the basicity is defined by the equation: 100% * [OH] / (3 * [Al]). The present invention further relates to a method for clarifying water and to a water clarification kit.

Description

WATER PURIFICATION COMPOSITION COMPRISING INERT PARTICULATE AND PURIFICATION MIXTURE
Field of the invention
The present invention relates to a water purification composition. The present invention in particular relates to a water purification composition for clarifying source water which otherwise hampers cleaning performance of detergents.
The water purification composition of the present invention comprises an aluminium chlorohydrate compound, a salt of an organic anionic compound having a molecular weight of not more than 1 ,000 kDa, a non-ionic and/or anionic polymeric flocculant having a molecular weight of more than 1 ,000 kDa and an inert particulate filler.
The present invention further relates to a method for clarifying water and to a water clarification kit.
Background of the invention
Water is one of the necessities of human life. Water is important for drinking, cooking food and for preparing beverages. Water is also very important for cleaning items used in the household like clothes, utensils, and other surfaces in the homes e.g the floors and table tops. Further, a large amount of water is used for personal cleaning in the bathrooms and toilets. The quality of water required for each of the above is different.
There are billions of people, especially in the underdeveloped and developing countries, especially in the rural areas, who do not have purified water piped to their homes.
Modern day urban households receive water from large lakes through a network of pipes, while in some rural areas villagers fetch water directly from sources like wells, lakes, rivers and bore wells. Water directly taken from such surface and underground sources are generally more impure as compared to piped water which has been treated by the municipality. Water from such sources is usually turbid and impure and hampers cleaning performance of detergents and personal care products and hence will have to be clarified before use.
Several types of water purification systems are known and available. They can be broadly classified into thermal, radiation, chemical and physical methods of purification or a combination of one or more of these methods.
One known method of reducing the suspended solids in water is by using flocculation techniques. Flocculation typically applies the use of sweep flocculation followed by bridging flocculation.
Sweep flocculation encompasses the following: electrolyte flocculants, such as Al-based or Fe-based salts, are added in a sufficient amount so that they form amorphous particles, e.g. amorphous AI(OH)3 particles. These amorphous particles entrap suspended solids leading to clarification of water. Such particles with entrapped suspended solids are called sweep floes and have a size in the range of 100 μηι or below. At this size the sweep floes are still difficult to separate from the water by, e.g. filtration or decantation. Moreover the kinetics of settling down of the sweep floes is very slow.
Therefore the next step is bridging flocculation which encompasses the addition of a polymeric flocculant with a molecular weight of at least 1 ,000 kDa. These polymers are thought to adsorb on the sweep floes and thereby bringing the sweep floes together to form bigger and stronger floes. This phenomenon is known as bridging flocculation. This bridging mechanism helps in increasing the settling velocity of the floes and contributes therefore to faster clarification of water.
Such water purification processes, which apply sweep flocculation, are typically found in the area of industrial waste water purification. Various industries produce waste water, such as chemical manufacturing plants, dairies, canneries, distilleries, paper manufacturing plants, dyeing plants, sewage plants and others. These water purification processes for industrial waste water typically require large water treatment plants and are time-consuming processes.
US 4,758,353A (General Motors, 1988) describes a method for removal of heavy metals from effluent waste water from the automobile industry. The method comprises the following steps:
(a) adding from 7 to 333 ppm of an anionic surfactant to said effluent water to provide coagulatable heavy metal ion;
(b) adjusting the effluent water to a pH within the range of 8 to 10;
(c) providing from 10 to 200 ppm of cationic coagulant to coagulate said heavy metal ion;
(d) providing from 0.3 to 5.0 ppm of a polymeric flocculant whereby a heavy metal containing floe is formed for removal from said effluent water; and
(e) then removing said floe from said effluent water,
wherein said anionic surfactant is sodium lauryl ether sulfate; the cationic coagulant is selected from the group consisting of diallyl dimethylammonium chloride polymer, epichlorohydrin dimethylamine polymer, ethylene amine polymer, polyaluminum chloride, and alum; and the flocculant is an acrylamide/sodium acrylate copolymer having an RSV greater than 23.
CN104445548 (ANHUI TIANRUN CHEMICALS, 2015) describes a composition comprising polyacrylamide for the treatment of sewage and sludge. The composition comprises polyacrylamide with a molecular weight between 1 ,000-15,000 kDa, and further comprises water-soluble surfactant, inorganic coagulant and water soluble inorganic salts. The water-soluble surfactant accounts for 1 to 10% by mass of the polyacrylamide.
A water purification composition that utilizes flocculation to purify water for household purposes should meet a number of requirements.
First of all, the turbidity should be reduced to an acceptable level in a reasonable amount of time, e.g. in a few minutes. For cleaning purposes a turbidity of 15 NTU or less is considered to be acceptable. Secondly, consumers have a preference for easy dosing systems, i.e. for an integral purification composition that only needs to be dosed once.
In addition, the purification composition should be suitable for each type of natural source water, independent of the characteristics of the water. The characteristics of natural source water varies across different geographies, and may have varying levels of turbidity, water hardness, total dissolved solids (TDS), alkalinity and so on.
Aluminium chlorohydrate, i.e. polyaluminium chloride with high basicity, is an example of an electrolyte flocculant. Aluminium chlorohydrate is typically applied in sweep flocculation when clarification of water is desired without alteration of the pH of the clarified water. One of the drawbacks of the application of aluminium chlorohydrate in sweep flocculation is that it only works if the natural source water, that needs to be clarified, has sufficient alkalinity.
A known solution to this problem is to add a source of alkalinity to purification compositions that comprises aluminium chlorohydrate and bridging flocculant.
US 6,136,219 A (DECKER STEPHEN, 2014) describes a composition for use in clarifying a body of water where pH balancing is required consisting essentially of, by weight, 46% of an anionic high molecular weight polyacrylamide having more than 100,000 monomer units per molecule, 46% of at least one compound selected from the group of aluminium chloral hydrate and aluminium oxide, 6% of at least one compound selected from the group of calcium carbonate and calcium sulfate; and approximately 2% citric acid.
The drawback of adding a source of alkalinity to a purification composition comprising aluminium chlorohydrate lies in the fact that these components need to be packaged separately to prevent the acidic aluminium chlorohydrate from reacting with the source of alkalinity. Even, in dry powder format, these components will react with each other, since moisture may ingress into the packaging during storage. Thus, there is a need for a water purification composition that does not alter the pH of source water that is treated, that is suitable for purifying source water having very different characteristics, and which can be provided and used as a single component.
Summary of the invention
The present invention provides a water purification composition comprising:
• 18-98 wt.% by dry weight of the composition of inert particulate filler; and
• 2-82 wt.% by dry weight of the composition of a purification mixture comprising by weight of this mixture:
a. 15 to 80 wt. % of an aluminium chlorohydrate compound of the general formula (AlnCI(3n-m)(OH)m), having a basicity in the range of 70%-95%; b. 15 to 80 wt. % of a salt of an organic anionic compound having a molecular weight of not more than 1 ,000 kDa and wherein said organic anionic compound comprises one or more anionic groups selected from carboxylate, sulfonate and sulfate; and
c. 5 to 20 wt. % of a non-ionic and/or anionic polymeric flocculant, having a molecular weight of more than 1 ,000 kDa;
wherein the molar ratio of the organic anionic compound to the aluminium is at least 0.19, and wherein the basicity is defined by the equation: 100% * [OH] / (3 * [Al]).
Although the inventors do not wish to be bound by theory, it is believed that the anionic compound in the present composition aids sweep flocculation with aluminium chlorohydrate by reducing the positive surface charge of the aluminium hydroxide particles. This provides an alternative to the presence of sufficient alkalinity that is normally required for sweep flocculation with aluminium chlorohydrate. The present purification composition is therefore suitable, without requiring a source of alkalinity, for purifying a wide range of source water, irrespective of the alkalinity present in the source water.
The anionic compound of the present invention can be suitably be packaged together with the aluminium chlorohydrate and is therefore suitable for dosaging as a single component. The invention also provides a method for clarifying water comprising suspended solids, said method comprising the steps of:
• dosing 0.1 -3 grams of dry matter of a purification composition per liter of water to obtain a mixture of the water and the purification composition;
• stirring said mixture to induce the formation of floes;
• separating the floes from the water to obtain clarified water;
wherein the purification composition is a purification composition according to the present invention.
Further provided is a water clarification kit comprising
• a container comprising a purification composition according to the present invention; and
• instructions for use instructing users to dose the purification composition to water to obtain water suitable for the preparation of an aqueous cleaning composition.
Detailed description of the invention
Accordingly, a first aspect of the invention relates to a water purification composition comprising:
• 18-98 wt.% by dry weight of the composition of inert particulate filler; and
• 2-82 wt.% by dry weight of the composition of a purification mixture comprising by weight of this mixture:
a. 15 to 80 wt. % of an aluminium chlorohydrate compound, having a basicity in the range of 70%-95%;
b. 15 to 80 wt. % of a salt of an organic anionic compound having a molecular weight of not more than 1 ,000 kDa and wherein said anionic compound comprises one or more anionic groups selected from carboxylate, sulfonate and sulfate; and
c. 5 to 20 wt. % of a non-ionic and/or anionic polymeric flocculant, having a molecular weight of more than 1 ,000 kDa;
wherein the anionic compound provides at least 0.19 of the one or more anionic groups per aluminium atom present in the aluminium chlorohydrate compound. The term locculation' as used herein refers to a process of contact and adhesion whereby the particles of a dispersion form larger-size clusters.
The term "polymeric flocculant" as used herein refers a polymer that is capable of promoting flocculation.
The term "aluminium chlorohydrate" as used herein refers to compounds having the general formula (AlnCI(3n-m)(OH)m), wherein the basicity of said compounds is in the range of 70% to 95%.
The term "basicity" as used herein refers to is defined by the equation: 100% * [OH] / (3 * [Al]).
The term "turbidity" as used herein refers to the cloudiness or haziness of a fluid caused by a large number of individual particles.
The unit "NTU" as used herein refers to Nephelometric Turbidity Units (NTU), as measured by the nephelometer, Turbiquant® 2100T, manufactured by Merck. The nephelometer preferably is calibrated using the standard formazin solutions as recommended by the instrument manufacturer. The nephelometer measures the propensity of particles to scatter a light beam focused on them.
The unit Da (Dalton) as used herein refers to atomic mass unit (amu, the less commonly used SI unit).
The purification composition of the present invention preferably has a low alkalinity, notably an alkalinity of less than 8 ppm as CaCC , when 0.5 gram of the composition is dispersed in 1 litre of deionized water having a temperature of 25°C. More preferably, the purification composition has an alkalinity of less than 7 ppm as CaCC , most preferably of less than 6 ppm as CaCC , when 0.5 gram of the composition is dispersed in 1 litre of deionized water having a temperature of 25°C. Alkalinity measured as CaCC can be determined by means of titration as described in ASTM D 1067-06. The purification composition of the present invention is preferably a solid, more preferably a powder or a granulate.
The combination of the inert particulate filler and the purification mixture preferably represents at least 80 wt.%, more preferably at least 85 wt.% and most preferably at least 90 wt.% of the purification composition.
The amount of inert particulate filler employed in the purification composition preferably is in the range of 20-90 wt.%, more preferably in the range of 30-80 wt.%, most preferably in the range of 40-75 wt.%.
The purification mixture containing the aluminium chlorohydrate compound, the salt of an anionic compound having a molecular weight of not more than 1 ,000 kDa and the non-ionic and/or anionic polymeric flocculant preferably constitutes 5-70 wt.%, more preferably in the range of 15-65 wt.%, most preferably in the range of 25-60 wt.% of the purification composition.
The aluminium chlorohydrate compound, having a basicity in the range of 70%-95% is preferably present in a concentration, calculated by weight of the purification mixture, of 20-70 wt.%, more preferably of 25-60 wt.%, most preferably of 30-55 wt.%.
Again, calculated by weight of the purification mixture, the composition preferably contains 20-70 wt. %, more preferably 25-60 wt.% and most preferably 30-55 wt.% of the salt of an anionic compound having a molecular weight of not more than 1 ,000 kDa.
The non-ionic and/or anionic polymeric flocculant, having a molecular weight of more than 1 ,000 kDa is preferably present in a concentration, calculated by weight of the purification mixture, of 5-18 wt.%, more preferably of 6-15 wt.% and most preferably of 10-12 wt.%. The combination of aluminium chlorohydrate compound, anionic compound, polymeric flocculant and inert particulate filler typically constitutes at least 80 wt.%, more preferably at least 85 wt.% and most preferably at least 90 wt.% of the purification composition.
The water content of the purification composition preferably does not exceed 10 wt.%, more preferably the water content does not exceed 8 wt.%.
The aluminium chlorohydrate compound in the purification composition is preferably selected from aluminium chlorohydrate, aluminium chlorohydrate sulfate and combinations thereof. Most preferably, the aluminium chlorohydrate compound is aluminium chlorohydrate.
The cation of the salt of the anionic compound preferably is a monovalent or divalent cation, more preferably it is a cation selected from K+, Na+, Mg2+ and combinations thereof.
The organic anionic compound in the purification composition preferably is selected from:
(i) an anionic compound comprising one or more carboxylate groups;
(ii) an anionic compound comprising one or more anionic groups selected from sulfonate and sulfate; and
combinations thereof.
In accordance with one preferred embodiment of the present invention the anionic compound is an organic anionic compound comprising one or more carboxylate groups.
More preferably, the anionic compound is an organic anionic compound comprising one or more carboxylate groups selected from:
• acrylate polymer with a molecular weight ranging from 1 -1 ,000 kDa;
• anionic polysaccharide with a molecular weight ranging from 1-1 ,000 kDa;
• conjugate base of an organic carboxylic acid; and
combinations thereof. The acrylate polymer is preferably selected from polyacrylate, poly(methyl methacrylate), copolymers and combinations thereof. Most preferably, the acrylate polymer is polyacrylate.
The acrylate polymer is preferably employed in the purification composition of the present invention to provide 0.2 to 1 , more preferably 0.3 to 0.8, most preferably 0.38 to 0.60 carboxylate groups per aluminium atom present in the aluminium chlorohydrate compound.
The anionic polysaccharide that can be applied as anionic compound in the purification composition is preferably selected from carboxymethyl cellulose, hydroxymethyl cellulose, hydroxylethyl methylcellulose, hydroxy I propyl methylcellulose, xanthan gum, alginate, pectin and combinations thereof. More preferably, the anionic polysaccharide is carboxymethyl cellulose, most preferably the anionic polysaccharide is the sodium salt of carboxymethyl cellulose with a degree of substitution ranging from 0.5 to 2.
The anionic polysaccharide preferably has a molecular weight ranging from 80-800 kDa.
The anionic polysaccharide is preferably applied in the present purification composition to provide 0.2 to 0.75, more preferably 0.3 to 0.67, most preferably 0.4 to 0.59 carboxylate groups per aluminium atom present in the aluminium chlorohydrate compound.
The conjugate base that can be applied as anionic compound in the purification composition preferably is the conjugate base of an organic carboxylic acid selected from lactate, citrate, tartrate, propionate and combinations thereof. More preferably, the anionic compound is the conjugate base of an organic carboxylic acid selected from citrate, tartrate and combinations thereof. Most preferably, the conjugate base of an organic carboxylic acid is citrate.
The conjugate base of an organic carboxylic acid is preferably applied in the purification composition to provide at least 0.19, more preferably 0.38 to 10, most preferably 0.57 to 5 carboxylate groups per aluminium atom present in the aluminium chlorohydrate compound.
According to another particularly preferred embodiment, the anionic compound in the purification composition is an organic anionic compound comprising one or more anionic groups selected from sulfonate and sulfate. Even more preferably, the organic anionic compound comprising one or more anionic groups selected from sulfonate and sulfate is an anionic surfactant comprising one or more anionic groups selected from sulfonate and sulfate.
Examples of such anionic surfactants include alkyl benzene sulfonate, alpha olefin sulfonate alkyl sulfate, alkenyl sulfate, alkyl ether sulfate, alkyl ethoxy sulfate and combinations thereof. More preferably, the anionic compound is an anionic surfactant selected from sodium dodecyl benzene sulfonate (Na-LAS), sodium dodecyl sulfate (SDS), sodium lauryl ether sulfate (SLES), methyl ester sulfate (MES), primary alcohol sulfate (PAS), alpha olefin sulfonate and combinations thereof. Most preferably, the anionic compound is an anionic surfactant selected from sodium dodecyl benzene sulfonate, sodium lauryl ether sulfate and combinations thereof.
The anionic surfactant is preferably applied in the purification composition to provide 0.29 to 0.86, more preferably 0.34 to 0.73, most preferably 0.4 to 0.6 of the one or more anionic groups, selected from sulfonate and sulfate, per aluminium atom present in the aluminium chlorohydrate compound
The inventors have discovered that the inclusion of anionic surfactant is particularly effective if the surfactant is coated onto the inert particulate filler or if the surfactant is present in the form of relatively large particles.
Accordingly, in one advantageous embodiment, the purification composition contains inert particulate filler that is coated with the anionic surfactant.
According to another preferred embodiment, the anionic surfactant is present in the purification composition in particulate form and has a mass weighed diameter in the range of 75-1 ,000 μηι, more preferably in the range of 100-800 μηη, most preferably in the range of 125-600 m.
The inert particulate filler in the purification composition preferably has a density of at least 1.5 kg/dm3, more preferably a density of 1.75-2.7 kg/dm3, most preferably a density of 2- 2.5 kg/dm3.
The inert particulate filler is preferably selected from feldspar, silica, bentonite, calcite, diatomaceous earth and combinations thereof. Most preferably, the inert particulate filler is feldspar.
The polymeric flocculant in the purification composition preferably is an anionic polymeric flocculant. The anionic polymeric flocculant is preferably selected from soluble alkali metal salts of poly (acrylic acid), polyacrylamide, and copolymers thereof.
Another aspect of the invention relates to the use of the purification composition as described herein for the clarification of water, preferably for the clarification of water with a turbidity of at least 50 NTU.
A further aspect of the invention relates to a method for clarifying water comprising suspended solids, said method comprising the steps of:
• dosing 0.1 -3 grams of dry matter of a purification composition per liter of water to obtain a mixture of the water and the purification composition;
• stirring said mixture to induce the formation of floes;
• separating the floes from the water to obtain clarified water;
wherein the purification composition is a purification composition as described herein. The present method is particularly effective for clarifying water having a turbidity of at least 50 NTU.
In a preferred embodiment of the present method the purification composition is dosed at 0.2-1 .5 grams of dry matter per liter of water.
Yet another aspect of the invention relates to a water clarification kit comprising a container comprising a purification composition as described herein; and instructions for use instructing users to dose the purification composition to water to obtain water suitable for the preparation of an aqueous cleaning composition.
In accordance with a preferred embodiment, the kit does not comprise a separately packaged second composition having an alkalinity of at least 8 ppm as CaCC , when 0.5 gram of the second composition is dispersed in 1 litre of deionized water having a temperature of 25°C.
The invention is further illustrated by the following non-limiting examples.
Examples
Example 1
Several purification compositions were compared for their clarification effect on clean water (24° French Hardness) that had been rendered turbid by the addition of 0.1 g/l of model particulate soil (comprising 90 % china clay, 5 % silica, 2.5 % carbon soot, 2.5 % iron oxide). Turbidity of this model dirty source water is 100 NTU with a pH of 6.5.
Different water purification compositions were prepared on the basis of the recipes shown in Table 1.
Table 1
Figure imgf000014_0001
1 Coated on feldspar 2 Flogel 3303 (obtained from SNF); Molecular weight >10,000 kDa; copolymer of sodium acrylate and acrylamide
The water purification compositions shown in Table 1 were added to the aforementioned turbid water in an amount of 0.5 gram per litre while continuously stirring, for 30 seconds at 100 rpm. After these 30 seconds of stirring the mixture was allowed to standstill for 1.5 minutes to allow the floes to separate from the clarified water.
The turbidity of the samples was measured using a Turbiquant® 2100 T manufactured by Merck. The calibration of the machine was done using standard protocol as per manual of the instrument.
The results of the turbidity measurements are presented in Table 2.
Table 2
Figure imgf000015_0001
Example 2
Purification compositions containing trisodium citrate or sodium tartrate were prepared on the basis of the recipes shown in Table 3. The aluminium chlorohydrate used had a basicity of 85%.
Table 3
Figure imgf000015_0002
1 Flogel 3303 (obtained from SNF); Molecular weight >10,000 kDa; copolymer of sodium acrylate and acrylamide The clarification effect of these water purification compositions was tested in the same way as described in Example 1 . The results are summarized in Table 4.
Table 4
Figure imgf000016_0001
Example 3
A purification compositions containing sodium polyacrylate (Molecular weight: 350 kDa) was prepared on the basis of the recipes shown in Table 5. The aluminium chlorohydrate used had a basicity of 85%.
Table 5
Figure imgf000016_0002
1 Flogel 3303 (obtained from SNF); Molecular weight >10,000 kDa; copolymer of sodium acrylate and acrylamide
The clarification effect of these water purification compositions was tested in the same way as described in Example 1 . The results are summarized in Table 6.
Table 6
Figure imgf000016_0003
Example 4
Purification compositions were prepared on the basis of the recipes shown in Table 7, using two types of sodium carboxymethylcellulose. The aluminium chlorohydrate used had a basicity of 85%. Table 7
Figure imgf000017_0001
1 Average molecular weight is 700 kDa; degree of substitution = 1.0
2 Average molecular weight is 90 kDa degree of substitution = 1.0
3 Flogel 3303 (obtained from SNF); Molecular weight >10,000 kDa; copolymer of sodium acrylate and acrylamide
The clarification effect of these water purification compositions was tested in the same way as described in Example 1 . The results are summarized in Table 8.
Table 8
1 2
Turbidity (NTU) 1 2

Claims

Claims
1. A water purification composition comprising:
• 18-98 wt.% by dry weight of the composition of inert particulate filler; and
• 2-82 wt.% by dry weight of the composition of a purification mixture comprising by weight of this mixture:
a. 15 to 80 wt. % of an aluminium chlorohydrate compound of the general formula (AlnCI(3n-m)(OH)m), having a basicity in the range of 70%-95%; b. 15 to 80 wt. % of a salt of an organic anionic compound having a molecular weight of not more than 1 ,000 kDa and wherein said organic anionic compound comprises one or more anionic groups selected from carboxylate, sulfonate and sulfate; and
c. 5 to 20 wt. % of a non-ionic and/or anionic polymeric flocculant, having a molecular weight of more than 1 ,000 kDa;
wherein the molar ratio of the organic anionic compound to the aluminium is at least 0.19, and wherein the basicity is defined by the equation: 100% * [OH] / (3 * [Al]).
2. Purification composition according to claim 1 , wherein the composition has an alkalinity of less than 8 ppm as CaCC , when 0.5 gram of the composition is dispersed in 1 litre of deionized water having a temperature of 25°C.
3. Purification composition according to any one of the previous claims, wherein the organic anionic compound is an organic anionic compound comprising one or more carboxylate groups.
4. Purification composition according to claim 3, wherein the organic anionic compound, comprising one or more carboxylate groups, is selected from:
acrylate polymer with a molecular weight ranging from 1 -1 ,000 kDa; anionic polysaccharide with a molecular weight ranging from 1-1 ,000 kDa; conjugate base of an organic carboxylic acid; and combinations thereof.
5. Purification composition according to claim 4, wherein the acrylate polymer provides 0.2 to 1.0 carboxylate groups per aluminium atom present in the aluminium chlorohydrate compound.
6. Purification composition according claim 4, wherein the anionic polysaccharide is selected from carboxymethyl cellulose, hydroxymethyl cellulose, hydroxylethyl methylcellulose, hydroxy I propyl methylcellulose, xanthan gum, alginate, pectin and combinations thereof.
7. Purification composition according to claim 4 or 6, wherein the anionic polysaccharide provides 0.2 to 0.75 carboxylate groups per aluminium atom present in the aluminium chlorohydrate compound
8. Purification composition according to claim 4, wherein the conjugate base is the conjugate base of an organic carboxylic acid selected from lactate, citrate, tartrate, propionate and combinations thereof.
9. Purification composition according to claim 1 or 2, wherein the anionic compound is an organic anionic compound comprising comprises one or more anionic groups selected from sulfonate and sulfate, more preferably the organic anionic compound is an anionic surfactant comprising one or more anionic groups selected from sulfonate and sulfate.
10. Purification composition according to claim 9, wherein the anionic surfactant is selected from alkyl benzene sulfonate, alpha olefin sulfonate alkyl sulfate, alkenyl sulfate, alkyl ether sulfate, alkyl ethoxy sulfate and combinations thereof.
1 1. Purification composition according to claim 9 or 10, wherein the anionic surfactant provides 0.29 to 0.86 of the one or more anionic groups, selected from sulfonate and sulfate, per aluminium atom present in the aluminium chlorohydrate compound
12. Purification composition according to any one of claims 9-1 1 , wherein the composition contains inert particulate filler that is coated with the anionic surfactant.
13. Purification composition according to any one of claims 9-1 1 , wherein the anionic surfactant is in particulate form and has a mass weighed diameter in the range of 75-1 ,000 m.
14. A method for clarifying water comprising suspended solids, said method comprising the steps of:
dosing 0.1 -3 grams of dry matter of a purification composition per liter of water to obtain a mixture of the water and the purification composition; stirring said mixture to induce the formation of floes;
separating the floes from the water to obtain clarified water; wherein the purification composition is a purification composition according to any one of claims 1 -13.
15. A water clarification kit comprising:
a container comprising a purification composition according to any one of claims 1 -13; and
instructions for use instructing users to dose the purification composition to water to obtain water suitable for the preparation of an aqueous cleaning composition.
PCT/EP2018/058681 2017-04-10 2018-04-05 Water purification composition comprising inert particulate and purification mixture WO2018189015A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR112019021160-8A BR112019021160B1 (en) 2017-04-10 2018-04-05 WATER PURIFICATION COMPOSITION, WATER WHITENING METHOD AND KIT
PH12019502207A PH12019502207A1 (en) 2017-04-10 2019-09-25 Water purification composition comprising inert particulate and purification mixture
ZA2019/06407A ZA201906407B (en) 2017-04-10 2019-09-27 Water purification composition comprising inert particulate and purification mixture

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17165702 2017-04-10
EP17165702.6 2017-04-10

Publications (1)

Publication Number Publication Date
WO2018189015A1 true WO2018189015A1 (en) 2018-10-18

Family

ID=58544778

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/058681 WO2018189015A1 (en) 2017-04-10 2018-04-05 Water purification composition comprising inert particulate and purification mixture

Country Status (3)

Country Link
PH (1) PH12019502207A1 (en)
WO (1) WO2018189015A1 (en)
ZA (1) ZA201906407B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021224095A1 (en) 2020-05-04 2021-11-11 Unilever Ip Holdings B.V. Composition
CN117486337A (en) * 2023-12-15 2024-02-02 北京宝莱尔科技有限公司 Water treatment agent and preparation method thereof

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758353A (en) 1987-06-19 1988-07-19 Nalco Chemical Company Removal of heavy metals from waste streams
US5023012A (en) * 1988-10-04 1991-06-11 Pieter Walter William Buchan Purification of water
US6136219A (en) 1999-07-01 2000-10-24 Decker; Stephen W. Composition for water clarification
FR2870229A1 (en) * 2004-05-13 2005-11-18 Acideka Sa Sa Composition, useful as coagulating and flocculating agent in a process of solid-liquid separation, comprises metallic coagulant, polymeric organic flocculant and tensioactive system (non ionic, anionic or cationic tensio active system)
EP2679546A1 (en) * 2012-06-26 2014-01-01 Unilever N.V. Water clarification composition and process
US20140124454A1 (en) * 2012-11-01 2014-05-08 Halosource, Inc. Water treatment composition and method of using same
CN104445548A (en) 2014-11-07 2015-03-25 安徽天润化学工业股份有限公司 Composite polyacrylamide for water treatment
WO2015062881A1 (en) * 2013-11-01 2015-05-07 Unilever N.V. Composition for purification of water

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758353A (en) 1987-06-19 1988-07-19 Nalco Chemical Company Removal of heavy metals from waste streams
US5023012A (en) * 1988-10-04 1991-06-11 Pieter Walter William Buchan Purification of water
US6136219A (en) 1999-07-01 2000-10-24 Decker; Stephen W. Composition for water clarification
FR2870229A1 (en) * 2004-05-13 2005-11-18 Acideka Sa Sa Composition, useful as coagulating and flocculating agent in a process of solid-liquid separation, comprises metallic coagulant, polymeric organic flocculant and tensioactive system (non ionic, anionic or cationic tensio active system)
EP2679546A1 (en) * 2012-06-26 2014-01-01 Unilever N.V. Water clarification composition and process
US20140124454A1 (en) * 2012-11-01 2014-05-08 Halosource, Inc. Water treatment composition and method of using same
WO2015062881A1 (en) * 2013-11-01 2015-05-07 Unilever N.V. Composition for purification of water
CN104445548A (en) 2014-11-07 2015-03-25 安徽天润化学工业股份有限公司 Composite polyacrylamide for water treatment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021224095A1 (en) 2020-05-04 2021-11-11 Unilever Ip Holdings B.V. Composition
CN117486337A (en) * 2023-12-15 2024-02-02 北京宝莱尔科技有限公司 Water treatment agent and preparation method thereof

Also Published As

Publication number Publication date
PH12019502207A1 (en) 2020-10-12
BR112019021160A2 (en) 2020-04-28
ZA201906407B (en) 2021-02-24

Similar Documents

Publication Publication Date Title
AU615684B2 (en) Flocculation of suspended solids from aqueous solutions
AU2011347794B2 (en) Water clarification composition and process
AU2013283649B2 (en) Water clarification composition and process
CN105000680B (en) Compound water treatment agent
AU2009268402A1 (en) Treatment additives and methods for treating an aqueous medium
WO2018189015A1 (en) Water purification composition comprising inert particulate and purification mixture
JP2009172555A (en) Flocculant
CN109790052B (en) Water purification composition for clarifying grey water
AU2017350146A1 (en) Purification composition for clarifying soiled water for obtaining water suitable for use in laundry
EP3519363B1 (en) Water clarification composition containing amphoteric polymer
JP6134940B2 (en) Coagulation treatment method for oil-containing cleaning wastewater
JP6744526B2 (en) Wastewater treatment method and wastewater treatment agent
KR101842094B1 (en) Cohesive agent and pH adjustment agent comprising sodium aluminum silicate for water-treatment
US8518267B2 (en) Treatment of surfactant laden wastewater
JP6028826B2 (en) Flocculant for waste water treatment and waste water agglomeration method
AU2011347796B2 (en) Water clarification composition and process
BR112019021160B1 (en) WATER PURIFICATION COMPOSITION, WATER WHITENING METHOD AND KIT
WO2019001875A1 (en) Composition for purification of turbid water
WO2019185393A1 (en) Metal-free water clarification composition
JP2024089041A (en) Coagulation method for adding boron
WO2019068575A1 (en) Clarification composition
JP2024089040A (en) Boron-containing basic aluminum chloride
WO2002076892A1 (en) Polyamphoteric polymers for raw water treatment
JP2004305944A (en) Iron-base flocculant
MX2007010311A (en) Treatment of highly contaminated waters with hydrocarbons.

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18714531

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112019021160

Country of ref document: BR

122 Ep: pct application non-entry in european phase

Ref document number: 18714531

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 112019021160

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20191008