WO2012018249A1 - Flocculating agent for waste water treatment and method of using thereof - Google Patents

Flocculating agent for waste water treatment and method of using thereof Download PDF

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Publication number
WO2012018249A1
WO2012018249A1 PCT/MY2011/000118 MY2011000118W WO2012018249A1 WO 2012018249 A1 WO2012018249 A1 WO 2012018249A1 MY 2011000118 W MY2011000118 W MY 2011000118W WO 2012018249 A1 WO2012018249 A1 WO 2012018249A1
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Prior art keywords
waste water
flocculating agent
water
accordance
chitosan
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Application number
PCT/MY2011/000118
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French (fr)
Inventor
Ki Jun Kim
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Macro Growth Sdn Bhd
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Publication of WO2012018249A1 publication Critical patent/WO2012018249A1/en

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5263Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/101Sulfur compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • C02F2101/22Chromium or chromium compounds, e.g. chromates
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/14Paint wastes

Definitions

  • This invention is related to a flocculating agent for waste water treatment and method of using thereof, and more particularly, to a flocculating agent for agglomerating and flocculating wastes and other contaminants from waste water, and the method of using thereof.
  • flocculating agent such as aluminium sulphate, inorganic low-molecular flocculating agents, inorganic polymer flocculating agents, organic polymer flocculating agents, gelatin, and silica gel
  • This technology has been widely used in treatment of sewage waste water, drinking water, industrial waste water, etc. Nonetheless, these well-known flocculating agents have limitations in their uses.
  • aluminium sulphate is the most commonly used flocculant because of its relatively low cost production, it is not a very effective flocculating agent. For examples, the agglomeration and flocculation speed is very low, and the size of formed floes is small. Further, use of aluminium sulphate must be accompanied by high temperature in order to perform adequate aggregation. Furthermore, aluminium sulphate causes the treated water to be highly acidic, which in turns, requires input of large amount of basic materials for neutralization purpose.
  • Ferric chloride which belongs to the group of inorganic low-molecular flocculating agents, however, shows stronger agglomeration and flocculation properties as formation of floes is larger and it is sufficiently efficient in agglomerating and flocculating wastes as well as heavy metals. Nevertheless, ferric chloride solution is highly corrosive and has low stability. Apart from that, the use of ferric chloride in treating waste water must be accompanied by slaked lime, which causes large production of sludge. Baking such sludge in turn causes further environmental pollution, which is not sensible.
  • the present invention relates to a novel and inventive flocculating agent for treating waste water caused by domestic, commercial, and industrial discharges.
  • the flocculating agent acts by agglomerating and flocculating wastes and other contaminants in the forms of suspended solids and colloidal particles into floes or flakes. The floes may then float to the top of the liquid, or settle to the bottom of the liquid, which are then readily filtered from the liquid.
  • the flocculating agent comprises, by weight, 2.52% to 12.52% Na 2 0, 43.25% to 53.25% Si0 2 , 16.52% to 26.52% Al 2 0 3 , 1 % to 6.06% K 2 0, 1 % to 10.22% CaO, 1 % to 8.25% Fe, 1.12% to 1 1.12% chitosan, and 2.06% to 12.06% ceramic powder.
  • the flocculating agent comprises, by weight, 7.52% Na 2 0, 48.25% Si0 2l 21.52% Al 2 0 3 , 1.06% K 2 0, 5.22% CaO, 3.25% Fe, 6.12% chitosan, and 7.06% ceramic powder.
  • the particle size of each aforesaid components present in the flocculating agent is approximately 50 pm.
  • the flocculating agent can be used to treat waste water resulting from domestic, commercial, and industrial discharges, such as water soluble coating waste water, water soluble mechanical waste water, factory waste water, construction site waste water, concrete waste water, iron(lll) oxide waste water, chromium waste, arsenic waste water, sludge, other contaminated liquids, and the like.
  • the flocculating agent is further employed for decolouration of dye waste water, print waste water, pigment waste water, and the like.
  • the amount of the flocculating agent that is required to satisfactorily treat the waste water is 100 mg/L to 4000 mg/L.
  • Figure 1 illustrates the effect of the flocculating agent on water soluble coating waste water according to the present invention
  • Figure 2 illustrates the effect of the flocculating agent on water soluble mechanical waste water according to the present invention
  • FIG. 3 illustrates the effect of the flocculating agent on factory waste water according to the present invention
  • FIG. 4 illustrates the effect of the flocculating agent on construction site waste water according to the present invention
  • Figure 5 illustrates the effect of the flocculating agent on concrete waste water according to the present invention
  • Figure 6 illustrates the effect of the flocculating agent on iron(lll) oxide waste water according to the present invention
  • Figure 7 illustrates the effect of the flocculating agent on chromium waste water according to the present invention.
  • Figure 8 illustrates the effect of the flocculating agent on arsenic waste water according to the present invention. DETAILED DESCRIPTION OF THE PRESENT INVENTION
  • a novel and inventive flocculating agent that is employed to treat waste water by agglomeration and flocculation of wastes and other contaminants that are in the forms of suspended solids and colloidal particles.
  • the agglomerated and flocculated wastes which are also known as either floes or flakes, may then float to the top of the liquid or settle to the bottom of the liquid, readily and easily to be filtered from the liquid.
  • the flocculating agent comprises, by weight, 2.52% to 12.52% Na 2 O, 43.25% to 53.25% SiO 2l 16.52% to 26.52% AI 2 O 3 , 1 % to 6.06% K 2 O, 1 % to 10.22% CaO, 1 % to 8.25% Fe, 1.12% to 11.12% chitosan, and 2.06% to 12.06% ceramic powder.
  • the flocculating agent comprises, by weight, 7.52% Na 2 O, 48.25% SiO 2 , 21.52% AI 2 O 3 , 1.06% K 2 O, 5.22% CaO, 3.25% Fe, 6.12% chitosan, and 7.06% ceramic powder.
  • the particle size of each aforesaid components is approximately 50 pm.
  • the flocculating agent is highly effective in treating a variety of waste water, resulting from domestic, commercial, and industrial discharges, such as waste soluble coating waste water, water soluble mechanical waste water, factory waste water, construction site waste water, concrete waste water, iron(lll) oxide waste water, chromium waste water, arsenic waste water, sludge, other contaminated liquids, and the like.
  • waste soluble coating waste water water soluble mechanical waste water
  • factory waste water factory waste water, construction site waste water, concrete waste water, iron(lll) oxide waste water, chromium waste water, arsenic waste water, sludge, other contaminated liquids, and the like.
  • the flocculating agent is also highly effective in decolouration of dye waste water, print waste water, pigment waste water, and the like.
  • the amount of the flocculating agent necessary for effective treatment of waste water is actually based on types of waste water.
  • Table 1 for non-exhaustive examples of the amounts of flocculating agent needed for treating different species of waste water.
  • 100 mg/L to 4000 mg/L of the flocculating agent is added into waste water to produce satisfactorily agglomeration and flocculation results.
  • the waste water is vigorously stirred for approximately 10 seconds and left to stand for an additional 10 seconds to visualize the formation of floes.
  • the waste water temperature and pH do not affect the performance of the flocculating agent. Therefore, pre-treatment and post-treatment of the waste water with heat, and basic or acidic chemicals are not necessary, resulting in further cost reduction.
  • Figures 1 to 8 illustrate the conditions of different types of waste water before and after the addition of the flocculating agent.
  • Arsenic waste water 100 Industrial waste water treated with the flocculating agent in accordance with the present invention is tested for harmful and toxic components with various detection methods, such as chromatography, spectrophotometer, and JIS K 0102. The test results are shown in Table 2. According to the test results, harmful and toxic components, for instances alkyl mercury, mercury compound, cadmium compound, lead, phosphorus, chromium, arsenic, hydrogen cyanide, phenyl chloride, copper, zinc, fluorine, and the like, are not present or detected in the treated industrial waste water. Table 2: Detection of harmful and toxic material in industrial waste water treated with flocculating agent
  • Waste water from Petronas Melacca refining plant is collected and treated with flocculating agent in accordance with the present invention .
  • the treated sample is analyzed for its amount of contaminants with methods that are published in APHA 19 th Edition 1995. The results are tabulated and shown below: Table 3: Waste water treated with the flocculating agent according to the present invention
  • NDLT denotes as None Detected Less Than
  • BOD biological oxygen demand
  • COD chemical oxygen demand

Abstract

A flocculating agent for waste water treatment, comprising, by weight, 2.52% to 12.52% Na2O, 43.25% to 53.25% SiO2, 16.52% to 26.52% Al2O3, 1 % to 6.06% K2O, 1 % to 10.22% CaO, 1 % to 8.25% Fe, 1.12% to 11.12% chitosan, and 2.06% to 12.06% ceramic powder, wherein the particle size of each said components is approximately 50 pm. Preferably, the flocculating agent comprises, by weight, 7.52% Na2O, 48.25% SiO2, 21.52% Al2O3, 1.06% K2O, 5.22% CaO, 3.25% Fe, 6.12% chitosan, and 7.06% ceramic powder. The amount of flocculating agent added into waste water to satisfactorily agglomerate and flocculate wastes and other contaminants in the forms of suspended solids and colloidal particles is based on types of waste water.

Description

FLOCCULATING AGENT FOR WASTE WATER TREATMENT AND
METHOD OF USING THEREOF
TECHNICAL FIELD OF THE INVENTION
This invention is related to a flocculating agent for waste water treatment and method of using thereof, and more particularly, to a flocculating agent for agglomerating and flocculating wastes and other contaminants from waste water, and the method of using thereof. BACKGROUND OF THE INVENTION
Nowadays, contamination of water in seas, rivers, ponds, and lakes is increasing due to a variety of reasons, such as shortcoming of sewage system, oil spill, marine dumping, eutrophication, etc. Aside from that, one of the major contributors in water contamination is industrial waste disposal in highly concentrated industrial areas, especially those areas that are closely situated to significant water sources. Many industrial facilities use freshwater to carry away waste from the plant and into rivers, lakes and oceans. Moreover, due to the extensive water use and discharges of insufficiency treated or even not treated waste water by the industries, clean water sources and industrial water sources are depleting. A further main cause of water pollution is the ever increasing city population, which has caused domestic waste water to be increased. Therefore, supplying industries and homes with fresh water has become increasingly more difficult. Therefore, treatment of waste water in order to reuse the water is vital, whether it is for human consumption, industrial uses, or for the sake of protecting the environment. Various methods of water treatment has been known and used for the aforesaid purposes. For one instance, water is treated with chlorine-releasing agents for human consumption purpose. However, water treated by chlorine-releasing agents has a number of drawbacks, such as unpleasant smell and taste. In addition, when phenols are present in chlorinated water, the phenols will react with the chlorine to generate trichlorophenol, which increase the severity of the unpleasant taste and smell of the chlorinated water. Another drawback of chlorine-treated water is that the chlorine-releasing agents do not agglomerate and/or flocculate colloidal particles and suspended solids in the water as it only works to kill off the bacteria present in the water.
Another known method for treating water is the addition of flocculating agent, such as aluminium sulphate, inorganic low-molecular flocculating agents, inorganic polymer flocculating agents, organic polymer flocculating agents, gelatin, and silica gel, into waste water to agglomerate and flocculate waste from waste water. This technology has been widely used in treatment of sewage waste water, drinking water, industrial waste water, etc. Nonetheless, these well-known flocculating agents have limitations in their uses.
Even though aluminium sulphate is the most commonly used flocculant because of its relatively low cost production, it is not a very effective flocculating agent. For examples, the agglomeration and flocculation speed is very low, and the size of formed floes is small. Further, use of aluminium sulphate must be accompanied by high temperature in order to perform adequate aggregation. Furthermore, aluminium sulphate causes the treated water to be highly acidic, which in turns, requires input of large amount of basic materials for neutralization purpose.
Ferric chloride, which belongs to the group of inorganic low-molecular flocculating agents, however, shows stronger agglomeration and flocculation properties as formation of floes is larger and it is sufficiently efficient in agglomerating and flocculating wastes as well as heavy metals. Nevertheless, ferric chloride solution is highly corrosive and has low stability. Apart from that, the use of ferric chloride in treating waste water must be accompanied by slaked lime, which causes large production of sludge. Baking such sludge in turn causes further environmental pollution, which is not sensible.
Therefore, it is an aim of this present invention to address the aforesaid technical disadvantages by introducing a novel and inventive flocculating agent, which is used in treating waste water resulting from domestic, commercial, and industrial discharges. The flocculating agent works by agglomerating and flocculating wastes and other contaminants in the forms of suspended solids and colloidal particles from the waste water.
SUMMARY OF THE PRESENT INVENTION
The present invention relates to a novel and inventive flocculating agent for treating waste water caused by domestic, commercial, and industrial discharges. The flocculating agent acts by agglomerating and flocculating wastes and other contaminants in the forms of suspended solids and colloidal particles into floes or flakes. The floes may then float to the top of the liquid, or settle to the bottom of the liquid, which are then readily filtered from the liquid.
In an embodiment of this present invention, the flocculating agent comprises, by weight, 2.52% to 12.52% Na20, 43.25% to 53.25% Si02, 16.52% to 26.52% Al203, 1 % to 6.06% K20, 1 % to 10.22% CaO, 1 % to 8.25% Fe, 1.12% to 1 1.12% chitosan, and 2.06% to 12.06% ceramic powder.
In a preferred embodiment of this present invention, the flocculating agent comprises, by weight, 7.52% Na20, 48.25% Si02l 21.52% Al203, 1.06% K20, 5.22% CaO, 3.25% Fe, 6.12% chitosan, and 7.06% ceramic powder.
In another embodiment of this invention, the particle size of each aforesaid components present in the flocculating agent is approximately 50 pm.
In a further embodiment of this invention, the flocculating agent can be used to treat waste water resulting from domestic, commercial, and industrial discharges, such as water soluble coating waste water, water soluble mechanical waste water, factory waste water, construction site waste water, concrete waste water, iron(lll) oxide waste water, chromium waste, arsenic waste water, sludge, other contaminated liquids, and the like. In yet another embodiment of this invention, the flocculating agent is further employed for decolouration of dye waste water, print waste water, pigment waste water, and the like. In still another embodiment of this invention, the amount of the flocculating agent that is required to satisfactorily treat the waste water is 100 mg/L to 4000 mg/L.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 illustrates the effect of the flocculating agent on water soluble coating waste water according to the present invention;
Figure 2 illustrates the effect of the flocculating agent on water soluble mechanical waste water according to the present invention;
Figure 3 illustrates the effect of the flocculating agent on factory waste water according to the present invention;
Figure 4 illustrates the effect of the flocculating agent on construction site waste water according to the present invention;
Figure 5 illustrates the effect of the flocculating agent on concrete waste water according to the present invention; Figure 6 illustrates the effect of the flocculating agent on iron(lll) oxide waste water according to the present invention;
Figure 7 illustrates the effect of the flocculating agent on chromium waste water according to the present invention; and
Figure 8 illustrates the effect of the flocculating agent on arsenic waste water according to the present invention. DETAILED DESCRIPTION OF THE PRESENT INVENTION
The above mentioned and other features and objects of this invention will become more apparent and better understood by reference to the following detailed description. It should be understood that the detailed description made known below is not intended to be exhaustive or limit the invention to the precise form disclosed as the invention may assume various alternative forms. On the contrary, the detailed description covers all the relevant modifications and alterations made to the present invention, unless the claims expressly state otherwise.
In accordance with the present invention, there is disclosed a novel and inventive flocculating agent that is employed to treat waste water by agglomeration and flocculation of wastes and other contaminants that are in the forms of suspended solids and colloidal particles. The agglomerated and flocculated wastes, which are also known as either floes or flakes, may then float to the top of the liquid or settle to the bottom of the liquid, readily and easily to be filtered from the liquid.
The flocculating agent comprises, by weight, 2.52% to 12.52% Na2O, 43.25% to 53.25% SiO2l 16.52% to 26.52% AI2O3, 1 % to 6.06% K2O, 1 % to 10.22% CaO, 1 % to 8.25% Fe, 1.12% to 11.12% chitosan, and 2.06% to 12.06% ceramic powder. Preferably, the flocculating agent comprises, by weight, 7.52% Na2O, 48.25% SiO2, 21.52% AI2O3, 1.06% K2O, 5.22% CaO, 3.25% Fe, 6.12% chitosan, and 7.06% ceramic powder. The particle size of each aforesaid components is approximately 50 pm.
The flocculating agent is highly effective in treating a variety of waste water, resulting from domestic, commercial, and industrial discharges, such as waste soluble coating waste water, water soluble mechanical waste water, factory waste water, construction site waste water, concrete waste water, iron(lll) oxide waste water, chromium waste water, arsenic waste water, sludge, other contaminated liquids, and the like. The flocculating agent is also highly effective in decolouration of dye waste water, print waste water, pigment waste water, and the like.
The amount of the flocculating agent necessary for effective treatment of waste water is actually based on types of waste water. Refer to Table 1 for non-exhaustive examples of the amounts of flocculating agent needed for treating different species of waste water. In general, 100 mg/L to 4000 mg/L of the flocculating agent is added into waste water to produce satisfactorily agglomeration and flocculation results. Upon addition of the flocculating agent, the waste water is vigorously stirred for approximately 10 seconds and left to stand for an additional 10 seconds to visualize the formation of floes. The waste water temperature and pH do not affect the performance of the flocculating agent. Therefore, pre-treatment and post-treatment of the waste water with heat, and basic or acidic chemicals are not necessary, resulting in further cost reduction. Figures 1 to 8 illustrate the conditions of different types of waste water before and after the addition of the flocculating agent.
Table 1 : Amounts of flocculating agent needed to treat different types of waste water
Types of waste water Amount (mg/L)
Water soluble coating waste water 4000
Water soluble mechanical waste water 4000
Factory waste water 150
Construction site waste water 150
Concrete waste water 200
Iron(lll) oxide waste water 200
Chromium waste water 200
Lake waste water 20 - 50
Reservoir waste water 20 - 50
Fish farm waste water 10 - 30
Arsenic waste water 100 Industrial waste water treated with the flocculating agent in accordance with the present invention is tested for harmful and toxic components with various detection methods, such as chromatography, spectrophotometer, and JIS K 0102. The test results are shown in Table 2. According to the test results, harmful and toxic components, for instances alkyl mercury, mercury compound, cadmium compound, lead, phosphorus, chromium, arsenic, hydrogen cyanide, phenyl chloride, copper, zinc, fluorine, and the like, are not present or detected in the treated industrial waste water. Table 2: Detection of harmful and toxic material in industrial waste water treated with flocculating agent
Figure imgf000008_0001
Waste water from Petronas Melacca refining plant is collected and treated with flocculating agent in accordance with the present invention . The treated sample is analyzed for its amount of contaminants with methods that are published in APHA 19th Edition 1995. The results are tabulated and shown below: Table 3: Waste water treated with the flocculating agent according to the present invention
Figure imgf000009_0001
NDLT denotes as None Detected Less Than
NA denotes as not applicable to the stated specification
* Malaysian Environment Quality Act 1974, Environment Quality (Sewage & Industrial Effluents) Regulations 1979
Referring to the above-identified results, the contaminant levels of suspended solids, oil and grease are dramatically reduced. Furthermore, the biological oxygen demand (BOD) and chemical oxygen demand (COD) levels of waste water treated with the flocculating agent is significantly lower than standard B specification as stated in Malaysian Environment Quality Act 1974, and Environment Quality (Sewage & Industrial Effluents) Regulations 1979. BOD is a standard chemical procedure for determining the uptake rate of dissolved oxygen in water by biological organisms residing in said water, whereas COD is a test method to measure indirectly the amount of organic compounds in water. Both the BOD and COD are commonly used in the measurement and indication of water quality. Apart from that, the amounts of free chlorine, phenol, sulphide, and ammonia are significantly reduced as well.

Claims

l/WE CLAIM
1. A flocculating agent for treatment of waste water, comprising, by weight,
2.52% to 12.52% Na20;
43.25% to 53.25% Si02;
16.52% to 26.52% Al203;
1 % to 6.06% K20;
1 % to 10.22% CaO;
1 % to 8.25% Fe;
1.12% to 1 1.12% chitosan; and
2.06% to 12.06% ceramic powder;
wherein the particle size of each said components is approximately 50 μιη. 2. A flocculating agent in accordance with claim 1 , wherein the flocculating agent preferably comprises, by weight, 7.52% Na20; 48.25% Si02; 21.52% Al203; 1.06% K20; 5.22% CaO; 3.25% Fe; 6.12% chitosan; and 7.06% ceramic powder. 3. A flocculating agent in accordance with claim 1 , wherein the waste water resulting from domestic, commercial, and industrial discharges is but not limited to water soluble coating waste water, water soluble mechanical waster water, factory waste water, construction site waste water, concrete waste water, iron(lll) oxide waste water, chromium waste water, arsenic waste water, sludge, other contaminated liquids, or the like.
4. A flocculating agent in accordance with claim 1 , wherein the flocculating agent is further employed for decolouration of dye waste water, print waste water, pigment waste water, and the like.
5. A method of using a flocculating agent for treatment of waste water, comprising by weight, 2.52% to 12.52% Na2O, 43.25% to 53.25% SiO2, 16.52% to 26.52% AI2O3, 1 % to 6.06% K2O, 1% to 10.22% CaO, 1 % to 8.25% Fe, 1.12% to 1 1.12% chitosan, and 2.06% to 12.06% ceramic powder, wherein the particle size of each said components is approximately 50 pm, is by adding 100 mg/L to 4000 mg/L of said flocculating agent into said waste water, sludge, and/or contaminated liquids.
6. A method in accordance with claim 5, wherein the flocculating agent preferably comprises, by weight, 7.52% Na20; 48.25% Si02; 21.52% Al203; 1.06% K20; 5.22% CaO; 3.25% Fe; 6.12% chitosan; and 7.06% ceramic powder.
7. A method in accordance with claim 5, wherein the waste water resulting from domestic, commercial, and industrial discharges is but not limited to water soluble coating waste water, water soluble mechanical waster water, factory waste water, construction site waste water, concrete waste water, iron(lll) oxide waste water, chromium waste water, arsenic waste water, sludge, other contaminated liquids, or the like.
8. A method in accordance with claim 5, wherein the flocculating agent is further employed for decolouration of dye waste water, print waste water, pigment waste water, and the like.
PCT/MY2011/000118 2010-08-02 2011-06-22 Flocculating agent for waste water treatment and method of using thereof WO2012018249A1 (en)

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MYPI2010003658 2010-08-02

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104556467A (en) * 2013-10-18 2015-04-29 北大方正集团有限公司 Method for treating spent etching solution and treating equipment thereof
CN106745599A (en) * 2016-12-17 2017-05-31 王庆中 Non-crystalline silica inorganic agent and the technique and equipment with its treatment sewage
CN107215933A (en) * 2017-06-29 2017-09-29 太仓市其盛化纤厂 A kind of sewage-treating agent
CN107215917A (en) * 2017-06-29 2017-09-29 太仓市其盛化纤厂 A kind of sewage-treating agent
WO2022235650A1 (en) * 2021-05-05 2022-11-10 Eaton Michael P Systems, methods, and compounds for sustainable wastewater treatment and co-products thereof

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US4566986A (en) * 1984-08-31 1986-01-28 Waldmann John J Flocculating agents and processes for making them
US5393435A (en) * 1993-09-17 1995-02-28 Vanson L.P. Removal of organic contaminants from aqueous media
GB2364047A (en) * 2000-06-27 2002-01-16 Procter & Gamble Water treatment composition

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WO2005009586A1 (en) * 2003-07-25 2005-02-03 Keiichiro Asaoka Coagulant, process for producing the same, and method of coagulation with the coagulant

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Publication number Priority date Publication date Assignee Title
US4566986A (en) * 1984-08-31 1986-01-28 Waldmann John J Flocculating agents and processes for making them
US5393435A (en) * 1993-09-17 1995-02-28 Vanson L.P. Removal of organic contaminants from aqueous media
GB2364047A (en) * 2000-06-27 2002-01-16 Procter & Gamble Water treatment composition

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104556467A (en) * 2013-10-18 2015-04-29 北大方正集团有限公司 Method for treating spent etching solution and treating equipment thereof
CN104556467B (en) * 2013-10-18 2017-02-08 北大方正集团有限公司 Method for treating spent etching solution
CN106745599A (en) * 2016-12-17 2017-05-31 王庆中 Non-crystalline silica inorganic agent and the technique and equipment with its treatment sewage
CN107215933A (en) * 2017-06-29 2017-09-29 太仓市其盛化纤厂 A kind of sewage-treating agent
CN107215917A (en) * 2017-06-29 2017-09-29 太仓市其盛化纤厂 A kind of sewage-treating agent
WO2022235650A1 (en) * 2021-05-05 2022-11-10 Eaton Michael P Systems, methods, and compounds for sustainable wastewater treatment and co-products thereof

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TW201213242A (en) 2012-04-01
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