AU2021106024A4 - A Method for Recovery of Coagulants from Water Treatment System (WTS) and Reuse of the Recovered Coagulants for Water Treatment - Google Patents
A Method for Recovery of Coagulants from Water Treatment System (WTS) and Reuse of the Recovered Coagulants for Water Treatment Download PDFInfo
- Publication number
- AU2021106024A4 AU2021106024A4 AU2021106024A AU2021106024A AU2021106024A4 AU 2021106024 A4 AU2021106024 A4 AU 2021106024A4 AU 2021106024 A AU2021106024 A AU 2021106024A AU 2021106024 A AU2021106024 A AU 2021106024A AU 2021106024 A4 AU2021106024 A4 AU 2021106024A4
- Authority
- AU
- Australia
- Prior art keywords
- water
- sludge
- coagulants
- water treatment
- recovered
- Prior art date
- Legal status (The legal status 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 status listed.)
- Ceased
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 239000000701 coagulant Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000011084 recovery Methods 0.000 title claims abstract description 21
- 239000010802 sludge Substances 0.000 claims abstract description 37
- 239000002352 surface water Substances 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract 2
- 235000011149 sulphuric acid Nutrition 0.000 claims abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000005189 flocculation Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 229940037003 alum Drugs 0.000 claims description 5
- 230000003993 interaction Effects 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 235000012206 bottled water Nutrition 0.000 claims description 2
- 239000003651 drinking water Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 208000024827 Alzheimer disease Diseases 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- C02F1/5209—Regulation methods for flocculation or precipitation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present disclosure relates to a method for recovery of coagulants from water
treatment system (WTS) and reuse of the recovered coagulants for water treatment. The
method comprises: collecting raw water and determining quality of the untreated surface
water by physicochemical analysis for different parameters of water quality; determining an
optimum coagulant dose required to treat the water by a jar test apparatus; adding a dosage of
a 2.5N H2SO4 to a sludge ratio wherein, after adding the acid to the sludge, an acid-sludge
solution is continuously stirred for a specific fixed time period of 30 min; and filtering the
acid-sludge solution to obtain the recovered coagulants for the reusing in the water treatment.
10
Description
A Method for Recovery of Coagulants from Water Treatment System (WTS) and Reuse of the Recovered Coagulants for Water Treatment
FIELD OF THE INVENTION The present disclosure relates to a method for recovery of coagulants from a water treatment system (WTS) and reuse of the recovered coagulants for water treatment.
BACKGROUND OF THE INVENTION Colloidal and suspended pollutants are frequently found in surface water. These contaminants are eliminated by a series of treatment operations at water treatment plants (WTPs), including coagulation, flocculation, sedimentation, filtering, and disinfection. When chemical coagulants like alum, ferric chloride, and ferrous sulphate are applied to raw water, they produce a gelatinous precipitate known as floc. During the coagulation-flocculation process, which is followed by sedimentation, sand, clay, silt, plant fibres, microbes, and other suspended and colloidal pollutants are removed. As a result, during the coagulation flocculation process, a substantial amount of sludge or residual is produced. WTPs generate more than 10,000 tons of sludge every day, according to anestimate. The amount of sludge produced annually by a typical WTP is of the order of 100,000 tons.
Water treatment sludge is typically released directly into neighbouring drains, sewerage systems, or landfill sites in many developing countries, including India. The basic practice of dumping sludge into water bodies is not safe. It causes aluminium to accumulate in streams or bodies of water, as well as in aquatic life developing in such water and, as a result, in human bodies. Alzheimer's disease has been connected by some studies to an elevated level of aluminium in human bodies.
In order to make the existing solutions more efficient there is a need to develop a method for a recovery of coagulants from a water treatment system (WTS) and reuse of the recovered coagulants for water treatment.
SUMMARY OF THE INVENTION The present disclosure relates to a method for recovery of coagulants from a water treatment system (WTS) and reuse of the recovered coagulants for water treatment. Water Treatment Sludge disposal could be made more sustainable by using recovered alum as a coagulant in the coagulation-flocculation process. The most cost-effective optimal condition was chosen, with a desirability value of 0.966, which projected a turbidity reduction of 95.4 percent. The optimum condition was found to be at a sludge ratio of 1% and an acid concentration of 30ml/L. At the optimum condition, 96.2 percent of the turbidity was removed. There was also a reduction in BOD, COD, and iron removals. This indicates that other contaminants in the water were also greatly reduced. The strategy allows for good interaction between the factors of recovery and reuse. Simultaneous modelling of coagulant recovery and recycling in the treatment of contaminated water using limited variables provides a sustainable, simple, and cost-effective solution to Sludge disposal, allowing it to be used in the water treatment process.
In an embodiment, a method 100 for a recovery of coagulants from a water treatment system (WTS) and a reuse of the recovered coagulants for water treatment comprises the following steps: at step 102, collecting raw water and determining quality of the untreated surface water by physicochemical analysis for different parameters of water quality; at step 104, determining an optimum coagulant dose required to treat the water by a jar test apparatus; at step 106, adding a dosage of a 2.5N H 2 SO4 to a sludge ratio wherein, after adding the acid to the sludge, an acid-sludge solution is continuously stirred for a specific fixed time period of 30 min; and at step 108, filtering the acid-sludge solution to obtain the recovered coagulants for reusing in the water treatment.
To further clarify advantages and features of the present disclosure, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings.
These and other features, aspects, and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
Figure 1 illustrates a method for a recovery of coagulants from a water treatment system (WTS) and reuse of the recovered coagulants for water treatment in accordance with an embodiment of the present disclosure.
Figure 2 illustrates (a) Predicted versus actual turbidity removal; and (b) Predicted and observed turbidity removal at optimum condition in accordance with an embodiment of the present disclosure.
Further, skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and may not have necessarily been drawn to scale. For example, the flow charts illustrate the method in terms of the most prominent steps involved to help to improve understanding of aspects of the present disclosure. Furthermore, in terms of the construction of the device, one or more components of the device may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.
DETAILED DESCRIPTION For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.
It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be restrictive thereof
Reference throughout this specification to "an aspect", "another aspect" or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Thus, appearances of the phrase "in an embodiment", "in another embodiment" and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.
The terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process or method that comprises a list of steps does not include only those steps but may include other steps not expressly listed or inherent to such process or method. Similarly, one or more devices or sub-systems or elements or structures or components proceeded by "comprises...a" does not, without more constraints, preclude the existence of other devices or other sub-systems or other elements or other structures or other components or additional devices or additional sub-systems or additional elements or additional structures or additional components.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The system, methods, and examples provided herein are illustrative only and not intended to be limiting.
Embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings.
Referring to Figure 1 illustrates a method for a recovery of coagulants from a water treatment system (WTS) and reuse of the recovered coagulants for water treatment in accordance with an embodiment of the present disclosure. The method 100 for a recovery of coagulants from a water treatment system (WTS) and reuse of the recovered coagulants for water treatment comprises the following steps: at step 102, collecting raw water and determining quality of the untreated surface water by physicochemical analysis for different parameters of water quality; at step 104, determining an optimum coagulant dose required to treat the water by a jar test apparatus; at step 106, adding a dosage of a 2.5N H 2 SO4 to a sludge ratio wherein, after adding the acid to the sludge, an acid-sludge solution is continuously stirred for a specific fixed time period of 30 min; and at step 108, filtering the acid-sludge solution to obtain the recovered coagulants for the reusing in the water treatment.
In an embodiment, the method, wherein, the sludgeacidified with 2.5N H 2 SO4 gave a better turbidity removal and hence, H 2 SO4 of normality 2.5N is utilized for the recovery of coagulants from the sludge wherein, for a better coagulant recovery, an optimum condition comprising sludge ratio ofl% acidified with the 30 ml/L H 2 SO4 used to regenerate and recover the alum as coagulant wherein, a dose of 12 ml/L of the recovered coagulant was found to remove about 96.2% turbidity from the water and wherein, the optimum condition is cost-effective having a desirability value of 0.966 which predicted a turbidity removal of 95.4%.
In another embodiment, the method, wherein, a reduction in BOD, COD and iron were also observed which shows that other impurities are also removed significantly from the water wherein, a utilization of the recovered coagulants as the coagulant in a coagulation flocculation process provides a sustainable alternative for the sludgedisposal wherein, a pH of the sludge was found to be 6.85, wherein, an acceptable pH for potable water lies between a range of 6.5 to 8.5wherein, the method provides good interaction among a recovery and a reuse factors wherein, the method can be used to predict the turbidity removal and optimize an independent variables within a range and wherein, a simultaneous coagulant recovery and its reuse in the treatment of surface water using a limited parameters provides a sustainable, simple, and economical solution to sludgedisposal problems.
Figure 2 illustrates (a) Predicted versus actual turbidity removal; and (b) Predicted and observed turbidity removal at optimum condition in accordance with an embodiment of the present disclosure.
In an implementation, a mathematical model is developed by fitting the obtained data using the following second order polynomial: n n n-1 n
Y=bo + IbiXi + Ibi + , + YbiXiXj i=1 i=1 i=1 j=i+1
where, Y is the percentage turbidity removal (dependent variable); Xi and Xj are the independent variables; bo, bi, bii, bij are the constant coefficient and, n is number of the independent variables. In the region of a line, the normal probability of an internally studentized residual was observed. As a result, residuals are dispersed normally. In Figure 2a, you can see a diagnostic map of projected versus actual turbidity removal.
The predicted and obtained turbidity reduction values are in good agreement, as evidenced by the higher R2 value. This demonstrates that the established method is statistically significant and adequate for forecasting turbidity reduction and can thus be utilized to optimize the independent variables.
Figure 2b shows the ideal setting for removing turbidity from water as determined by numerical optimization. As a result, sludge ratio of 1% acidified with 30 ml/L H 2 SO4 was utilized to recycle and recover the alum as coagulant at the optimum condition. The recovered coagulant was found to remove 96.2 percent of the turbidity from the water at a dose of 12 ml/L.
The drawings and the forgoing description give examples of embodiments. Those skilled in the art will appreciate that one or more of the described elements may well be combined into a single functional element. Alternatively, certain elements may be split into multiple functional elements. Elements from one embodiment may be added to another embodiment. For example, orders of processes described herein may be changed and are not limited to the manner described herein. Moreover, the actions of any flow diagram need not be implemented in the order shown; nor do all of the acts necessarily need to be performed. Also, those acts that are not dependent on other acts may be performed in parallel with the other acts. The scope of embodiments is by no means limited by these specific examples. Numerous variations, whether explicitly given in the specification or not, such as differences in structure, dimension, and use of material, are possible. The scope of embodiments is at least as broad as given by the following claims.
Benefits, other advantages, and solutions to problems have been described above with regard to specific embodiments. However, the benefits, advantages, solutions to problems, and any component(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential feature or component of any or all the claims.
Claims (10)
1. A method for recovery of coagulants from water treatment system (WTS) and reuse of the recovered coagulants for water treatment, the method comprises:
collecting raw water and determining quality of the untreated surface water by physicochemical analysis for different parameters of water quality;
determining an optimum coagulant dose required to treat the water by a jar test apparatus;
adding a dosage of a 2.5N H 2 SO4 to a sludge ratio wherein, after adding the acid to the sludge, an acid-sludge solution is continuously stirred for a specific fixed time period; and
filtering the acid-sludge solution to obtain the recovered coagulants for the reuse of the coagulants.
2. The method as claimed in claim 1, wherein, the sludgeacidified with 2.5N H 2 SO4 gave a better turbidity removal and hence, H 2 SO 4 of normality 2.5N is utilized for the recovery of coagulants from the water treatment sludge.
3. The method as claimed in claim 1, wherein, for a better coagulant recovery, an optimum condition comprising sludge ratio of 1% acidified with the 30 ml/L H 2 SO4 used to regenerate and recover the alum as coagulant
4. The method as claimed in claim 3, wherein, a dose of 12 ml/L of the recovered coagulant was found to remove about 96.2% turbidity from the water.
5. The method as claimed in claim 3, wherein, the optimum condition is cost-effective having a desirability value of 0.966 which predicted a turbidity removal of 95.4%.
6. The method as claimed in claim 1, wherein, a reduction in BOD, COD and iron were also observed which shows that other impurities are also removed significantly from the water.
7. The method as claimed in claim 1, wherein, a utilization of the recovered coagulants as the coagulant in a coagulation-flocculation process provides a sustainable alternative for the water treatment sludge disposal.
8. The method as claimed in claim 1, wherein, a pH of the sludge was found to be 6.85, wherein, an acceptable pH for potable water lies between a range of 6.5 to 8.5.
9. The method as claimed in claim 1, wherein, the method provides good interaction among a recovery and a reuse factors and wherein, the method can be used to predict the turbidity removal and optimize an independent variables within a range.
10. The method as claimed in claim 1, wherein, a simultaneous coagulant recovery and its reuse in the treatment of surface water using a limited parameters provides a sustainable, simple, and economical solution to sludge disposal problems.
collecting raw water and determining quality of the untreated surface water by physicochemical analysis for different 102 parameters of water quality;
determining an optimum coagulant dose required to treat the water by a jar test apparatus; 104
adding a dosage of a 2.5N H2SO4 to a sludge ratio wherein, after adding the acid to the sludge, an acid- 106 sludge solution is continuously stirred for a specific fixed time period of 30 min; and
filtering the acid-sludge solution to obtain the recovered coagulants for reusing in the water treatment. 108
Figure 1
2
90
80
(b)
Predicted turbidity removal (%) 70
60
60 70 80 90 100
Actual turbidity removal (%)
(a)
Figure 2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021106024A AU2021106024A4 (en) | 2021-08-19 | 2021-08-19 | A Method for Recovery of Coagulants from Water Treatment System (WTS) and Reuse of the Recovered Coagulants for Water Treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021106024A AU2021106024A4 (en) | 2021-08-19 | 2021-08-19 | A Method for Recovery of Coagulants from Water Treatment System (WTS) and Reuse of the Recovered Coagulants for Water Treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021106024A4 true AU2021106024A4 (en) | 2021-11-18 |
Family
ID=78514079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021106024A Ceased AU2021106024A4 (en) | 2021-08-19 | 2021-08-19 | A Method for Recovery of Coagulants from Water Treatment System (WTS) and Reuse of the Recovered Coagulants for Water Treatment |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2021106024A4 (en) |
-
2021
- 2021-08-19 AU AU2021106024A patent/AU2021106024A4/en not_active Ceased
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2626786C (en) | Wastewater treatment method comprising decantation and fine screening stages, and device for carrying out said method | |
| CN106830425A (en) | It is a kind of to remove system and its technique that sulfate radical in waste water recycles sediment | |
| JP2003236584A (en) | Sewage treatment apparatus | |
| CN101948215A (en) | Garbage leachate treatment process | |
| CN1206177C (en) | Method for reclamation and utilization of oil refining sewage | |
| CN1699223A (en) | Method of preparing pure water using metallurgic sewage | |
| CN105439386B (en) | Deep treatment method and device for hazardous waste physical and chemical treatment unit | |
| KR100957851B1 (en) | Method of water treatment | |
| Ahmad et al. | Simultaneous modelling of coagulant recovery and reuse by response surface methodology | |
| Ródenas et al. | The River Segura: reclaimed water, recovered river | |
| AU2021106024A4 (en) | A Method for Recovery of Coagulants from Water Treatment System (WTS) and Reuse of the Recovered Coagulants for Water Treatment | |
| KR0149156B1 (en) | Apparatus and method for the treatment of grind waste water | |
| Eades et al. | Treatment of spent filter backwash water using dissolved air flotation | |
| JP2007098270A (en) | Method and apparatus for producing pure water | |
| US20130075339A1 (en) | Method for clarifying industrial wastewater | |
| Wang et al. | Total waste recycle system for water purification plant using alum as primary coagulant | |
| JP2008142683A (en) | Water treatment method | |
| CN101891325A (en) | Method for treating recycled water by combining chemical oxidation method and double-membrane method | |
| CN218665664U (en) | Acidic cleaning water recycling system | |
| JP2704109B2 (en) | Sewage return water treatment method | |
| Gregory et al. | Minimising Sludge Production at Water‐Treatment Plants | |
| JPH10314757A (en) | Method for treating sewage turned back water | |
| CN218810940U (en) | High hydrochloric acid solution recovery processing system | |
| CN108046500B (en) | Method and apparatus for treating waste water | |
| JP2005296756A (en) | Treatment method of ion-exchange resin regeneration waste liquid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |